JP4091046B2 - Cogeneration system - Google Patents

Description

  The present invention relates to a cogeneration system that generates electric power according to electric power demand, stores generated heat generated along with power generation, and supplies the stored thermal energy when necessary. In particular, the present invention relates to a technology that realizes downsizing of the system.

  The cogeneration system generates power according to electric power demand, stores the generated heat generated with the power generation, and supplies the stored thermal energy when necessary. In a general cogeneration system, a hot water tank that stores hot water heated by power generation heat, a mixing unit that mixes hot water stored in the hot water tank and tap water (cold water), and a mixing unit passed. A heater for heating the mixed water as needed is provided. In such a cogeneration system, hot water stored in a hot water tank is adjusted to an appropriate temperature when necessary, and hot water is supplied to hot water use points (hot water tap, bathtub, shower, etc.). If hot water hotter than the hot water temperature required at the hot water use location is stored in the hot water tank, the hot water sent from the hot water tank and tap water (cold water) are mixed to the required temperature by mixing in the mixing unit. Hot water. If hot water having a temperature lower than the hot water temperature required at the hot water use location is stored in the hot water storage tank, the hot water is heated by a heater. Even when heating with a heater, the amount of heat required is smaller than when heating tap water. The cogeneration system has high overall energy efficiency and can reduce running costs for hot water supply.

Some cogeneration systems can perform heating operation. In the cogeneration system of Patent Document 1, warm water in the heating path is heated using the thermal energy stored in the hot water tank, and floor heating operation or the like can be performed. Energy efficiency is further improved by making effective use of generated heat.
In a cogeneration system having a hot water supply path and a heating path, the number of pipes is large, the arrangement of the pipes is complicated, and the system tends to be large. In the cogeneration system of Patent Document 1, the number of pipes is such that the water pipe in the hot water tank is diverted from the forward pipe that feeds the water to the power generation unit, and the water pipe that feeds the tap water to the hot water tank and a part of the water pipe is also used. As a result, the system can be downsized without downsizing the hot water tank.

JP 2004-317043 A

As in the cogeneration system of Patent Document 1, a cogeneration system including a hot water supply path and a heating path includes a heater for heating the hot water supply path and a heater for heating the heating path. As the heater, a burner and a burner heat exchanger are often used, and the space occupied by the burner and the burner heat exchanger in the system is large. The cogeneration system disclosed in Patent Document 1 includes two sets of burners and burner heat exchangers, which is one of the factors that increase the size of the system.
It is an object of the present invention to provide a technique for reducing the size of the entire cogeneration system while having a hot water supply path and a heating path.

The cogeneration system of the present invention generates electric power according to electric power demand, stores generated heat generated with power generation, and supplies the stored thermal energy when necessary. The cogeneration system includes a power generation unit that generates power, a hot water storage tank that stores hot water, a mixing unit that mixes hot water and tap water, and whose mixing ratio can be adjusted, and a heating terminal. As a water path for connecting them, a first water path for supplying tap water to the hot water storage tank, a second water path for connecting the hot water storage tank and the mixing unit, and a third water for supplying the mixed water mixed in the mixing unit. A path and a fourth water path passing through the power generation unit and having one end connected to the first water path and the other end connected to the second water path are provided. In addition, the first circulation means for circulating the water in the first circulation path composed of the first water path, the hot water storage tank, the second water path, and the fourth water path, and the second heat medium for heating the heating terminal circulate. A circulation path, a second circulation means for circulating the heat medium in the second circulation path, and a heater for heating the heat medium in the second circulation path are provided. And it has the 1st heat exchanger which performs heat exchange between the water in the 2nd water path between the connection part of the 4th water path, and the hot water storage tank, and the heat carrier in the 2nd circulation path. .
In the cogeneration system of the present invention, during the power generation operation, hot water heated by the generated heat can be sent to the mixing unit to adjust the temperature and supply hot water. Even when there is no request for hot water supply operation, the hot water in the hot water storage tank can be sent to the power generation unit, heated with the generated heat, and returned to the hot water storage tank to be stored in the hot water storage tank. When there is a hot water supply operation request, the hot water stored in the hot water storage tank can be sent to the mixing unit to adjust the temperature and supply hot water. When the power generation operation is stopped and hot water that can be used for hot water is not stored in the hot water tank, the heating medium in the second circulation path is heated by the heater to raise the temperature, in the first heat exchanger, The hot water in the second water path can be heated by the heated heat medium in the second circulation path. That is, the heating medium provided in the heating path can be used to heat the heat medium in the heating path, and the hot water in the hot water supply path can be heated by the heated heating medium in the heating path. According to this configuration, it is not necessary to provide a heater such as a burner and a burner heat exchanger for heating the hot water supply path as in the conventional cogeneration system. While having a hot water supply path and a heating path, the number of heaters arranged in the system can be reduced to one set, so the system can be downsized.

In the cogeneration system of the present invention, the first circulation path in which the first circulation means is arranged and the second circulation path in which the second circulation means are arranged pass through the first heat exchanger. For this reason, if the heat medium in the second circulation path is hotter than the hot water in the first circulation path, the hot water in the first circulation path can be heated by the heat medium in the second circulation path. Therefore, when the power generation operation is stopped and there is no heat storage available in the hot water tank, the heating medium in the heating path is heated by the heater, and the high-temperature heating medium in the heating path is heated in the first heat exchanger. The temperature can be raised by heating the low-temperature water from the hot water tank. Conversely, if the hot water in the first circulation path is higher in temperature than the heat medium in the second circulation path, the heat medium in the second circulation path can be heated by the hot water in the first circulation path. Therefore, during the power generation operation, the heat medium in the heating path can be heated with the high-temperature water heated by the power generation unit in the first heat exchanger. In addition, even when the power generation operation is stopped, when there is heat storage available in the hot water storage tank, in the first heat exchanger, the high-temperature water stored in the hot water storage tank is used as the heat medium in the heating path. Can be heated.
Furthermore, it is preferable that the first circulation means of the cogeneration system of the present invention can change the circulation direction, and the second circulation means can also change the circulation direction.
For example, if the first circulation path is a circulation path that sends low temperature water from the lower part of the hot water tank to the power generation unit and returns the high temperature water heated by the generated heat to the upper part of the hot water tank, heat storage proceeds from the upper part of the hot water tank. The high temperature layer is laminated on the upper part of the low temperature layer of the hot water tank to form a temperature stratification. If the direction of circulation of the hot water in the first circulation path is one direction, the hot water storage tank until the heat storage is full and there is no thermal difference between the upper hot water and the lower hot water. The hot water sent out from is the low-temperature water at the bottom of the hot water tank. Therefore, until the heat storage is full and there is a heat storage state where there is no temperature difference between the hot water in the upper part and the lower part of the hot water tank, the hot water stored in the hot water tank is used to transfer the heat medium in the heating path. It cannot be heated.
In the cogeneration system of the present invention, the circulation direction of the hot water in the first circulation path can be switched. As a result, the hot water stored in the upper part of the hot water tank passes through the first heat exchanger, so even if the hot water temperature in the lower part of the hot water tank is low, Heating operation can be performed by heating the heat medium in the heating path with high-temperature water. Thermal energy can be used effectively to improve thermal efficiency. In addition, when the hot water in the first circulation path circulates in the reverse direction, the heat exchanger rate can be further increased by circulating the heat medium in the heating path in the reverse direction.
As for the method of switching the circulation direction in the path, for example, a pump capable of normal rotation and reverse rotation may be provided as the first circulation means and the second circulation means. Alternatively, a part of the circulation path may be parallel, and one pump may be provided at each portion to change the circulation direction, and the pump that can be circulated in the desired circulation direction may be driven.

The second circulation path of the cogeneration system includes a bypass path that bypasses the first heat exchanger and can be switched between a path that passes through the first heat exchanger and a path that bypasses the first heat exchanger. Preferably there is.
For example, when heating operation is performed while heating the heat medium in the second circulation path with a heater, if the heat medium circulates in the path passing through the first heat exchanger, the heat medium stays in the second water path. Heat is taken away by the low-temperature water, and the heat efficiency is poor. At this time, if the heat medium for heating in the second circulation path and the hot water in the second water path can be prevented from exchanging heat, the thermal energy in the second circulation path is converted to the second shared path. It can be used for heating operation without being deprived of low-temperature water staying inside. Depending on the operating condition of the system, the path passing through the first heat exchanger and the path bypassing can be switched, and the thermal efficiency of the system is further improved.

Another cogeneration system of the present invention generates electric power according to electric power demand, stores electric power generated by the electric power generation, and supplies the stored thermal energy when necessary. The cogeneration system includes a power generation unit that generates power, a hot water storage tank that stores hot water, a mixing unit that mixes hot water and tap water, and whose mixing ratio can be adjusted, and a heating terminal. As a water path for connecting them, a first water path for supplying tap water to the hot water storage tank, a second water path for connecting the hot water storage tank and the mixing unit, and a third water for supplying the mixed water mixed in the mixing unit. A path and a fourth water path passing through the power generation unit and having one end connected to the first water path and the other end connected to the second water path are provided. In addition, the first circulation means for circulating the water in the first circulation path composed of the first water path, the hot water storage tank, the second water path, and the fourth water path, and the second heat medium for heating the heating terminal circulate. A circulation path, a second circulation means for circulating the heat medium in the second circulation path, and a heater for heating the heat medium in the second circulation path are provided. A second heat exchanger is provided that is attached to the outside of the hot water tank and exchanges heat between the water in the hot water tank and the heat medium in the second circulation path. The cogeneration system heats the heat medium in the second circulation path by the heater while the power generation operation is stopped, and circulates the heat medium in the second circulation path by the second circulation means. Heat the water.
Even in the cogeneration system of the present invention, hot water heated by the generated heat can be sent to the mixing unit to adjust the temperature and supply hot water during the power generation operation. Even when there is no request for hot water supply operation, the hot water in the hot water storage tank can be sent to the power generation unit, heated with the generated heat, and returned to the hot water storage tank to be stored in the hot water storage tank. When there is a hot water supply operation request, the hot water stored in the hot water storage tank can be sent to the mixing unit to adjust the temperature and supply hot water. When the power generation operation is stopped, and hot water that can be used for hot water supply is not stored in the hot water tank, the heating medium in the second circulation path is heated by the heater to raise the temperature, in the second heat exchanger, The hot water in the hot water storage tank can be heated by the heated heat medium in the second circulation path. That is, it is possible to use the heater disposed in the heating path to heat the heat medium in the heating path, heat the hot water in the hot water storage tank by the heated heat medium in the heating path, and use it for hot water supply. This configuration also eliminates the need for a heater such as a burner and a burner heat exchanger for heating the hot water supply path as in the conventional cogeneration system. While having a hot water supply path and a heating path, the number of heaters arranged in the system can be reduced to one set, so the system can be downsized.

The second circulation path of the cogeneration system includes a bypass path that bypasses the second heat exchanger, and a path that passes through the second heat exchanger and a path that bypasses the second heat exchanger can be switched. Preferably there is.
If the heating medium in the second circulation path can switch between the path passing through the first heat exchanger and the bypass path according to the operating condition of the system, the heating medium in the second circulation path can be switched. The heat medium and the hot water in the hot water tank can be heat exchanged or not exchanged, and the thermal efficiency of the system is improved.

In any cogeneration system of the present invention, a third circulation path through which water in the bathtub circulates, third circulation means for circulating water in the third circulation path, and a heat medium in the second circulation path, It is preferable to include a third heat exchanger that exchanges heat with warm water in the third circulation path.
According to this configuration, the hot water in the third circulation path can be heated by the high-temperature heat medium in the second circulation path. That is, the hot water from the bathtub can be heated by the heat medium in the heated heating path, and the reheating operation can be performed. Even if there is only one set of heaters provided in the system, hot water supply operation, heating operation, and bath reheating operation can be performed, and the system can be miniaturized.

It is preferable that the 3rd circulation means of the cogeneration system of this invention can switch the circulation direction in a 3rd circulation path.
When the heat medium in the second circulation path circulates in the reverse direction, if the hot water in the third circulation path circulates in the reverse direction, the hot water in the third circulation path is heated by the high-temperature heat medium in the second circulation path. Can be effectively heated, and the thermal efficiency is improved.

Hereinafter, preferred embodiments of the present invention will be described.
(Form 1) The heat medium in the heating path is water.
(Mode 2) For heating the hot water in the hot water supply path and the hot water in the heating path, any one of the generated heat, the heat storage in the hot water storage tank, and the heater disposed in the heating path is used.

Example 1
A first embodiment embodying a cogeneration system of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the cogeneration system of the present embodiment includes a power generation unit 110, a hot water supply system 10, and the like.
The power generation unit 110 includes a reformer 112, a fuel cell 114, heat exchangers 116 and 118, a heat medium radiator 120, a heat medium three-way valve 122, a path connecting them, and the like.
The reformer 112 is provided with a burner 131. When the burner 131 is operated to generate heat, the reformer 112 generates hydrogen gas from hydrocarbon-based gas. The high-temperature combustion gas burned by the burner 131 is guided to the combustion gas path 126. The combustion gas path 126 passes through the heat exchanger 116 from the reformer 112 and is opened to the outside. A heat recovery path 128 also passes through the heat exchanger 116. The combustion gas path 126 guides the high-temperature combustion gas generated in the burner 131 to the heat exchanger 116, heats the water flowing through the heat recovery path 128, and discharges the combustion gas whose temperature has decreased due to heat exchange to the outside.
The heat recovery path 128 includes a heat recovery forward path 128 a and a heat recovery return path 128 b and is connected to the hot water supply system 10. How the heat recovery path 128 is connected to the hot water supply system 10 will be described in detail later. The heat recovery path 128 circulates hot water. The hot water flowing through the heat recovery path 128 is heated by the combustion gas flowing through the combustion gas path 126 by passing through the heat exchanger 116, and the temperature rises.

The fuel cell 114 has a plurality of cells. The fuel cell 114 and the reformer 112 are connected by a hydrogen gas supply path 121. The hydrogen gas generated by the reformer 114 flows through the hydrogen gas supply path 121 and is supplied to the fuel cell 114. The fuel cell 114 generates power by reacting the hydrogen gas supplied from the reformer 112 with oxygen in the air. When the fuel cell 114 generates power, it generates heat.
The heat medium circulation path 124 forms a circulation path that returns to the fuel cell 114 through the fuel cell 114, the heat exchanger 118, the reserve tank 125, the heat medium pump 127, and the heat medium three-way valve 122. A heat medium temperature sensor 117 is mounted on the downstream side of the fuel cell 114 in the heat medium circulation path 124. The heat medium temperature sensor 117 detects the temperature of the heat medium flowing through the heat medium circulation path 124. The detection signal of the heat medium temperature sensor 117 is output to the controller 21 attached to the hot water supply system 10.
The heat medium three-way valve 122 includes one inlet 122a and two outlets 122b and 122c. The heat medium three-way valve 122 switches between communication between the inlet 122a and the outlet 122b or communication between the inlet 122a and the outlet 122c.
A cooling path 129 that connects the outlet 122b of the heat medium three-way valve 122 and the downstream side of the outlet 122c of the heat medium three-way valve 122 of the heat medium circulation path 124 is provided. The heat medium circulation path 124 and the cooling path 129 circulate pure water as a heat medium. A heat medium radiator 120 is mounted in the middle of the cooling path 129. A heat medium cooling fan 119 is provided adjacent to the heat medium radiator 120. When the heat medium cooling fan 119 is operated, air is blown to the heat medium radiator 120, and the heat medium flowing through the cooling path 129 is cooled.
The reformer 112, the fuel cell 114, the burner 131, the heat medium three-way valve 122, the heat medium pump 127, and the heat medium cooling fan 119 are controlled by the controller 21.

When the fuel cell 114 is activated, the inlet 122a and the outlet 122c of the heat medium three-way valve 122 are communicated and the heat medium pump 127 is operated. When the heat medium pump 127 is operated, the heat medium circulates through the heat medium circulation path 124. The heat generation medium is recovered from the fuel cell 114 by circulating the heat medium through the heat medium circulation path 124. The generated heat recovered by the heat medium is transported together with the heat medium to the heat exchanger 118, and heats the hot water flowing through the heat recovery path 128. The heat recovery path 128 will be described later.
If the temperature of the heat medium detected by the heat medium temperature sensor 117 becomes too high, the generated heat is not sufficiently recovered, so that the generated heat is dissipated. The inlet 122a and outlet 122b of the heat medium three-way valve 122 communicate with each other, and the heat medium cooling fan 119 is operated at the same time. When the inlet 122 a and the outlet 122 b of the heat medium three-way valve 122 communicate with each other, the heat medium flows into the cooling path 129 and passes through the heat medium radiator 120. The heat medium is cooled by passing through the heat medium radiator 120. The heat medium radiator 120 radiates heat with high efficiency when air is blown from the heat medium cooling fan 119. When the temperature of the heat medium decreases, the inlet 122a and the outlet 122c of the heat medium three-way valve 122 are communicated again. By repeating such switching of the heat medium three-way valve 122, the temperature of the heat medium is maintained within a predetermined range.

The hot water supply system 10 includes a hot water storage tank 20, a heat source machine (heater) 22, a mixing unit (mixer) 24, a plurality of paths that communicate these, a controller 21, and the like.
The controller 21 includes a CPU, a ROM, a RAM, and the like, and the power generation unit 110 and the hot water supply system 10 are controlled by the CPU processing a control program stored in the ROM. The RAM temporarily stores various signals input to the controller 21 and various data generated in the course of execution of processing by the CPU. A remote controller 23 is connected to the controller 21. The remote controller 23 is provided with switches and buttons for operating the power generation unit 110 and the hot water supply system 10, a liquid crystal display for displaying the operation state of the power generation unit 110 and the hot water supply system 10 and displaying an operation method described later. Yes.

A first shared path 26 for supplying tap water to the hot water tank 20 is connected to the bottom of the hot water tank 20. In the vicinity of the inlet 26 a of the first shared path 26, a pressure reducing valve 28 is attached. The downstream side of the pressure reducing valve 28 of the first shared path 26 and the water supply inlet 24 a of the mixing unit 24 are connected by a mixing unit water supply path 30. The pressure reducing valve 28 adjusts the water supply pressure to the hot water tank 20 and the mixing unit 24. When the hot water in the hot water storage tank 20 decreases or the water supply inlet 24a of the mixing unit 24 opens, the downstream pressure of the pressure reducing valve 28 decreases. The pressure reducing valve 28 opens when the downstream pressure decreases, and tries to maintain the pressure at a predetermined pressure regulation value. For this reason, when the hot water in the hot water storage tank 20 decreases or the water supply inlet 24a of the mixing unit 24 opens, tap water is supplied to them.
The hot water storage tank 20 stores water regulated to a regulated pressure value. The hot water tank 20 is formed of a pressure resistant container that can withstand the pressure regulation value. An outlet 20a is provided at the upper part of the hot water tank 20, and a relief valve 31 is mounted thereon. The valve opening pressure of the relief valve 31 is set slightly higher than the pressure regulation value of the pressure reducing valve 28. When the pressure regulation of the pressure reducing valve 28 becomes impossible, the relief valve 31 is opened to prevent the pressure in the hot water tank 20 from exceeding the pressure resistance. One end 32 a of a pressure release path 32 is connected to the relief valve 31. The other end 32 b of the pressure release path 32 is open to the outside of the hot water tank 20.
A second common path 42 that sends hot water from the hot water tank 20 to the hot water inlet 24 c of the mixing unit 24 is connected to the outlet 20 a at the upper part of the hot water tank 20. The second shared path 42 is disposed so as to pass through the heat exchanger 53.
A drainage path 33 that connects the bottom of the hot water tank 20 and the vicinity of the other end 32 b of the pressure release path 32 is provided. A drain valve 34 is attached in the middle of the drain path 33. The drain valve 34 can be manually opened and closed. When the drain valve 34 is opened, the water in the hot water tank 20 is drained to the outside through the drain path 33 and the open path 32.

One end of a heat recovery forward path 128 a is connected to the downstream side of the pressure reducing valve 28 in the first shared path 26. One end of a heat recovery return path 128b is connected to the upstream side of the mixing unit 24 in the second shared path 42. A circulation pump 40 is mounted in the middle of the heat recovery outward path 128a. The circulation pump 40 can rotate forward and backward. Below, the case where the circulation pump 40 act | operates by forward rotation is demonstrated. The case where the circulation pump 40 is operated in the reverse rotation will be described later.
When the circulation pump 40 operates in the forward rotation, the hot water is sucked out from the bottom of the hot water tank 20 through the first common path 26. The hot water sucked out from the hot water storage tank 20 enters the heat recovery forward path 128a, and is heated by passing through the heat exchangers 118 and 116 of the power generation unit 110, so that the temperature rises. The hot water whose temperature has risen flows through the heat recovery return path 128b, enters the second shared path 42, and is returned to the upper part of the hot water tank 20. As a result, a heat recovery circulation path that returns to the top of the hot water tank 20 through the first shared path 26, the heat recovery forward path 128a, the heat recovery return path 128b, and the second shared path 42 is formed in this order from the bottom of the hot water tank 20. The That is, the first shared path 26 and the second shared path 42 are also used as a heat recovery circulation path for recovering the generated heat generated in the power generation unit 110 into the hot water tank 20. At this time, the hot water in the first shared path 26 flows in the opposite direction to the flow of tap water when supplying tap water, and the hot water in the second shared path 42 is supplied from the hot water tank 20 to the mixing unit 24. It flows in the opposite direction to the flow of hot water when it is sent out.

  The circulating pump 40 operates in the forward rotation, and the hot water in the hot water storage tank 20 circulates in the heat recovery circulation path as described above, whereby hot hot water is stored in the hot water storage tank 20. When the hot water from the power generation unit 110 is returned to the hot water tank 20 from the state where the temperature in the hot water tank 20 is low, the hot water is returned to the upper part of the hot water tank 20, so that the high temperature layer is formed above the cold water layer. Is formed (hereinafter referred to as “temperature stratification”). The temperature of water deeper than the high temperature layer drops rapidly. During power generation, when low-temperature hot water is sucked out from the bottom of the hot water tank 20 and high-temperature hot water continues to be returned to the top, the high-temperature layer does not cross with the low-temperature layer, and the thickness (depth) of the low-temperature layer gradually increases. It becomes smaller and the thickness (depth) of the high temperature layer becomes gradually larger. In a state where the hot water storage tank 20 is fully stored, hot hot water is stored in the entire hot water storage tank 20. By forming the temperature stratification, high-temperature hot water is sent out from the outlet portion 20a provided at the uppermost portion of the hot water storage tank 20 even if the hot water storage tank 20 is not fully stored. On the other hand, when hot water in the hot water tank 20 is used, hot hot water at the top of the hot water tank 20 is sucked out, and when tap water enters from the bottom, the thickness (depth) of the high temperature layer gradually decreases, and the low temperature layer The thickness (depth) of the film gradually increases. When the hot water in the hot water tank 20 is used up, the hot water tank 20 is filled with tap water.

  An upper thermistor 35 is attached to a location 5 liters from the upper part of the hot water tank 20, and a lower thermistor 36 is attached to the lower part of the hot water tank 20. The upper thermistor 35 detects the upper temperature in the hot water tank 20, and the lower thermistor 36 detects the lower temperature in the hot water tank 20. The detection signals of the upper thermistor 35 and the lower thermistor 36 are output to the controller 21, respectively. The detected temperatures of the upper thermistor 35 and the lower thermistor 36 are used not only for hot water temperature control but also for calculating the heat storage amount. The calculated heat storage amount is stored over time in a storage unit prepared in the controller 21.

  The mixing unit 24 includes a hot water inlet 24c, a mixed water outlet 24b, a first flow rate sensor 67, a hot water thermistor 50, a water supply thermistor 48, a mixed water thermistor 54, a high-cut thermistor 55, and the water supply inlet 24a already described. The first flow sensor 67 detects the flow rate of the mixed water flowing out from the mixed water outlet 24b. The hot water thermistor 50 detects the temperature of the hot water flowing into the hot water inlet 24c via the second shared path 42. The water supply thermistor 48 detects the temperature of the tap water flowing from the first shared path 26 through the mixing unit water supply path 30 into the water supply inlet 24a. The mixed water thermistor 54 and the high cut thermistor 55 detect the temperature of the mixed water flowing out from the mixed water outlet 24b. Detection signals from the first flow sensor 67, the hot water thermistor 50, the feed water thermistor 48, the mixed water thermistor 54, and the high cut thermistor 55 are output to the controller 21.

The controller 21 uses the detection signal of the mixed water thermistor 54 to change the opening on the hot water inlet 24c side and the opening on the water supply inlet 24a side. When the opening degree on the hot water inlet 24c side and the opening degree on the water supply inlet 24a side are changed, the mixing ratio between the hot water from the hot water storage tank 20 and tap water (cold water) is adjusted. When the mixing ratio between the hot water from the hot water tank 20 and the tap water is adjusted, the temperature of the hot water flowing out from the mixed water outlet 24b is maintained at a predetermined value.
By using the controller 21 and the mixing unit 24 in combination, the temperature of the mixed water measured by the mixed water thermistor 54 is adjusted to the temperature commanded by the controller 21.
When the high-cut thermistor 55 detects that the hot water has greatly exceeded the predetermined value (that is, when the mixed water thermistor 54 or the mixing unit 24 is highly likely to have failed), the controller 21 opens the hot water inlet 24c. close. When the hot water inlet 24c is closed, hot water having a temperature greatly exceeding the predetermined value is prevented from being supplied from the hot water tap 64.

  The mixed water outlet 24 b of the mixing unit 24 and the hot water tap 64 are connected by a hot water supply path 51. The hot-water tap 64 is arranged in a bathroom, a washroom, a kitchen, etc. (in FIG. 1, the plurality of hot-water taps 64 are represented by one). The hot water supply path 51 is a path that passes through the heat source unit 22, and the second flow rate sensor 47 and the hot water supply thermistor 65 are attached to the hot water supply path 51. A detection signal from the second flow sensor 47 is output to the controller 21. The hot water supply thermistor 65 detects the temperature of the hot water sent to the hot water tap 64 through the heat source unit 22. A detection signal from the hot water supply thermistor 65 is output to the controller 21.

In addition, the heat source unit 22 includes a burner heat exchanger 60, a burner 57, a reheating heat exchanger 58, a replenishing water valve 59, a cistern 61, and the like.
From the middle of the hot water supply path 51 in the heat source machine 22, a systern water intake path 62 is branched. The open end of the cistern water intake path 62 is inserted into the upper part of the cistern 61. A makeup water valve 59 is provided in the middle of the cistern water intake path 62. The makeup water valve 59 is controlled by the controller 21 and opens and closes when a built-in solenoid is driven. When the replenishing water valve 59 is opened, hot water from the mixing unit 24 is supplied to the cistern 61.
A water level electrode 66 is mounted in the cis turn 61. The water level electrode 66 has a rod-shaped high level switch 66a and a low level switch 66b. The lower end of the high level switch 66 a is located at the high level water level of the cistern 61. The lower end of the low level switch 66 b is located at the low level water level of the cistern 61. The high level switch 66a and the low level switch 66b output a detection signal to the controller 21 when they are in contact with water. Based on the detection signal from the water level electrode 66, the controller 21 determines whether the water level of the cistern 61 exceeds the high level water level, is between the high level water level and the low level water level, or is lower than the low level water level. What is appropriate as the cis turn 61 is a state where the water level is located between the high level and the low level. The controller 21 controls opening / closing of the replenishing water valve 59 based on the water level detection signal from the water level electrode 66 and maintains the water level of the cistern 61 within an appropriate range.

One end of a cistern outgoing path 68 is connected to the bottom of the cistern 61. A heating pump 69 is mounted in the middle of the cis-turn path 68. The heating pump 69 can rotate forward and backward. The heating pump 69 is controlled by the controller 21. The other end of the cis-turn path 68 branches into a burner upstream path 71 and a low-temperature water path 70. The burner upstream path 71 connects the cistern outbound path 68 and the upstream side of the burner heat exchanger 60. A heating low temperature thermistor 72 that detects the temperature of the hot water flowing inside is installed in the burner upstream path 71. A detection signal of the heating low temperature thermistor 72 is output to the controller 21.
The burner heat exchanger 60 is heated by a gas combustion type burner 57. A high-temperature water path 73 is connected downstream of the burner heat exchanger 60. A heating high temperature thermistor 74, a heating terminal thermal valve 75, and a heating terminal 76 are attached to the high temperature water path 73 in order from the upstream side, and the A port 86a of the three-way valve 86 is connected to the downstream end. The hot water path 73 is disposed on the downstream side of the heating terminal 76 so as to pass through the heat exchanger 53. The heat exchanger 53 is a plate fin type heat exchanger, and an air layer is formed between the second shared path 42 and the high-temperature water path 73. One end of a cistern return path 56 is connected to the B port 86 b of the three-way valve 86. The other end of the cis turn return path 56 is connected to the bottom of the cis turn 61. A bypass path 52 is branched from between the heating terminal 76 and the heat exchanger 53 in the high-temperature water path 73. The downstream end of the bypass path 52 is connected to the C port 86 c of the three-way valve 86. When the A port 86a and the B port 86b of the three-way valve 86 are opened and communicated, and the C port 86c is closed, a path passing through the heat exchanger 53 is formed. When the C port 86c and the B port 86b of the three-way valve 86 are open and communicated, and the A port 86a is closed, a path that bypasses the heat exchanger 53 is formed. When a path passing through the heat exchanger 53 is formed, the heat exchanger 53 performs heat exchange between the hot water in the high temperature water path 73 and the hot water in the second shared path 42 described above.
The heating high temperature thermistor 74 detects the temperature of the hot water flowing through the high temperature water path 73. A detection signal of the heating high temperature thermistor 74 is output to the controller 21.

The heating terminal 76 includes a heat exchanger 76b, an operation switch 76a, and an electric fan (not shown). The heat exchanger 76b performs heat exchange between the hot water flowing through the high temperature water path 73 and the air. The operation switch 76 a is connected to the heating terminal thermal valve 75 and the controller 21.
The heating terminal thermal valve 75 includes an expansion element and an on-off valve mechanically connected to the expansion element. When the operation switch 76a of the heating terminal 76 is turned on, power is supplied to the expansion element of the heating terminal thermal valve 75. The energized expansion element becomes hot and expands. The expanded expansion element drives the on-off valve, thereby opening the heating terminal thermal valve 75. Further, when the operation switch 76 a is turned on, the controller 21 operates the heating pump 69. Since operation of the heating terminal 76 requires high-temperature water of about 80 ° C., the heating operation is performed as follows using the burner 57 as a heating means. When the operation switch 76a is turned on, the heating terminal thermal valve 75 is opened, the C port 86c and the B port 86b of the three-way valve 86 communicate with each other, and the heating pump 69 operates in the normal rotation. As a result, hot water is sucked from the cistern 61 to the cistern route 68. The controller 21 controls the burner 57 based on the hot water temperature detected by the heating low temperature thermistor 72 and the heating high temperature thermistor 74, and maintains the temperature of the hot water flowing out of the burner heat exchanger 60 within a predetermined range. The electric fan of the heating terminal 76 rotates when the operation switch 76a is turned on, and blows air to the heat exchanger 76b. The air blown to the heat exchanger 76b is warmed by exchanging heat with warm water via the heat exchanger 76b. Warmed air blows out from the heating terminal 76 to heat the room. By performing heat exchange with the air in the heat exchanger 76b, the temperature of the hot water decreases. The hot water whose temperature has decreased flows through the high-temperature water path 73, enters the cistern return path 56 via the bypass path 52, and returns to the cistern 61.

The downstream side of the heating high temperature thermistor 74 in the high temperature water path 73 and the upstream side of the entrance to the cistern 61 in the high temperature water path 73 are connected by a tracking path 77. The tracking path 77 passes through the tracking heat exchanger 58. On the upstream side of the tracking heat exchanger 58 in the tracking path 77, a tracking thermal valve 78 is mounted. The reheating heat valve 78 is controlled by the controller 21.
The bathtub 79 is provided with a suction port 79a and a supply port 79b. The suction port 79 a and the supply port 79 b are connected by a bath circulation path 80. The bath circulation path 80 passes through the reheating heat exchanger 58. As described above, the tracking path 77 also passes through the tracking heat exchanger 58. For this reason, in the reheating heat exchanger 58, heat exchange is performed between the bath circulation path 80 and the reheating path 77. A bath water level sensor 81, a bath circulation pump 82, and a bath water flow switch 84 are mounted on the upstream side of the reheating heat exchanger 58 in the bath circulation path 80. The bath circulation pump 82 can rotate forward and backward. The bath circulation pump 82 is controlled by the controller 21. The bath water level sensor 81 and the bath water flow switch 84 output detection signals to the controller 21. The bath water level sensor 81 detects water pressure. The controller 21 estimates the water level of the hot water stretched on the bathtub 79 from the water pressure detected by the bath water level sensor 81. The bath water flow switch 84 is turned on when water flows through the bath circulation path 80.
On the upstream side of the bath water level sensor 81 in the bath circulation path 80, a bath thermistor 85 that detects the temperature of hot water sucked out from the bathtub 79 is mounted. The detection signal of the bath thermistor 85 is output to the controller 21.

  When the reheating heat valve 78 is opened while the heating pump 69 is operating, the hot water flows into the reheating path 77 and passes through the reheating heat exchanger 58. Below, the case where the bath circulation pump 82 act | operates by forward rotation is demonstrated. The case where the bath circulation pump 82 operates in the reverse rotation will be described later. When the bath circulation pump 82 operates in the forward rotation, the hot water is sucked out from the suction port 79a of the bathtub 79, flows through the bath circulation path 80, and returns to the bathtub 79 from the supply port 79b again. The hot water flowing through the bath circulation path 80 is heated by the hot water flowing through the chasing path 77 by the chasing heat exchanger 58 and the hot water in the bathtub 79 is chased.

A hot water filling path 25 that connects the hot water supply path 51 and the downstream side of the bath circulation pump 82 of the bath circulation path 80 is provided. A solenoid drive type pouring valve 27 and a hot water filling amount sensor 83 are attached to the hot water filling passage 25. The pouring valve 27 is controlled by the controller 21 and opens and closes the hot water filling path 25. The hot water filling amount sensor 83 detects the amount of water flowing through the hot water filling passage 25 to estimate how much the hot water filling operation has been performed to the bathtub 79. The hot water filling amount sensor 83 outputs a detection signal to the controller 21.
When hot water is filled in the bathtub 79, the hot water pouring valve 27 is opened. When the pouring valve 27 is opened, warm water flows from the hot water supply path 51 through the hot water filling path 25 into the bath circulation path 80. Hot water that has flowed into the bath circulation path 80 is supplied to the bathtub 79 from the suction port 79 a and the supply port 79 b, and is filled in the bathtub 79. At this time, the bath circulation pump 82 is not driven, and the water filling operation to the bathtub 79 is performed by the water pressure applied to the water filling passage 25.

In the middle of the low-temperature water path 70, a low-temperature thermistor 94, a floor heating thermal valve 90, and a floor heater 91 are provided. The downstream end of the low-temperature water path 70 is connected to the upstream side of the branch point to the bypass path 52 of the high-temperature water path 73. The floor heater 91 warms the floor with warm water flowing through the low-temperature water path 70. When performing floor heating, the floor heating thermal valve 90 is opened, and the hot water is guided to the floor heater 91. The guided hot water warms the floor heater 91. When floor heating is not performed, the floor heating thermal valve 90 is closed. The low temperature thermistor 94 detects the temperature of the hot water flowing through the low temperature water path 70. The detection signal of the low temperature thermistor 94 is output to the controller 21. The floor heating thermal valve 90 is controlled by the controller 21.
The upstream side of the heating terminal thermal valve 75 in the high temperature water path 73 and the downstream side of the floor heater 91 in the low temperature water path 70 are connected by a bypass path 92. The bypass path 92 is provided with a bypass thermal valve 93 that opens and closes the bypass path 92. The bypass thermal valve 93 is controlled by the controller 21.

In the cogeneration system of the present embodiment, as described above, the first shared path 26 that is a water supply path for sending tap water to the mixing unit 24 and the hot water storage tank 20 uses hot water from the bottom of the hot water storage tank 20 in the power generation unit 110. It is also used as a heat recovery circulation path to be sent to the heat exchangers 116 and 118. Further, the second shared path 42 that is a return path for collecting the generated heat into the hot water tank 20 is also used as a path for sending the hot water from the hot water tank 20 to the mixing unit 24. The circulation pump 40 disposed in the heat recovery circulation path, the heating pump 69 disposed in the heating path, and the bath circulation pump 82 disposed in the bath circulation path 80 are all normally rotated. And reverse rotation is possible. Furthermore, the second shared path 42 and the heating path (high-temperature water path 73) are configured to pass through the heat exchanger 53, while a path that bypasses the heat exchanger 53 is also prepared for the heating path. ing. The burner and burner heat exchanger provided in the heat source unit 22 is only one set of the burner 57 and the burner heat exchanger 60 arranged in the heating path. Therefore, when performing hot water supply operation, floor heating operation, bath renewal, and heat storage operation, a plurality of path forms can be formed. Further, as means for heating the hot water in the path, any one of the generated heat generated in the power generation unit 110, the heat storage in the hot water tank 20, and the gas combustion type burner 57 can be used. The route form is determined by selecting the most suitable heating means suitable for the operation status of the system. When any one of hot water supply operation, floor heating operation, bath renewal operation, and heat storage operation is performed independently, the optimum route form is determined by the processing shown in FIGS. The path forms formed in this embodiment are shown in FIGS. A path indicated by a solid line in the figure indicates that hot water is circulating or circulating in the path, and an arrow indicates a flowing direction or a circulating direction of the hot water.
Note that when the heating terminal 76 is operated, high-temperature water of about 80 ° C. is necessary, so that only the path using the burner 57 as a heating means as described above is formed. For this reason, below, description and illustration about the driving | operation of the heating terminal 76 are omitted. Further, in any of the route forms described below, the heating terminal thermal valve 75 that is opened only when the heating terminal 76 is in operation is in a closed state.

As shown in FIG. 2, when the power of the cogeneration system is turned on in step S10 (YES), the process proceeds to step S12. In step S12, it is determined whether or not there is a hot water supply operation request. If there is a hot water supply operation request (YES in step S12), the process proceeds to process A in step S14.
In the process A, as shown in FIG. 3, it is determined in step S110 whether or not the power generation unit 110 is performing a power generation operation. If the power generation operation is in progress (YES in step S110), hot water can be supplied using generated heat. Therefore, it progresses to step S112 and the path | route form 1 shown in FIG. 7 is formed.
As shown in FIG. 7, in the path configuration 1, the hot water tap 64 is opened and tap water is introduced into the bottom of the hot water tank 20 through the first common path 26, and hot water or water at the top of the hot water tank 20 is first. 2 is sent to the mixing unit 24 through the shared path 42. Further, since the circulation pump 40 is driven in the forward rotation, the tap water is also introduced into the heat recovery forward path 128a and is heated by the generated heat generated by the power generation unit 110. The heated warm water joins the second common path from the heat recovery return path 128 b and is sent out to the mixing unit 24. At this time, even if the temperature of the hot water sent out from the hot water storage tank 20 is lower than the hot water supply set temperature, the hot water sent out from the power generation unit 110 can join to obtain hot water that is higher than the hot water set temperature. The hot water sent out to the mixing unit 24 is adjusted to a hot water supply set temperature, and hot water is supplied from the hot water tap 64 through the hot water supply path 51.

If power generation operation is not being performed in the power generation unit 110 in step S110 of FIG. 3 (if NO), hot water cannot be supplied using generated heat. It progresses to step S114 and it is discriminate | determined whether there exists heat storage which can be utilized for hot water supply in the hot water storage tank 20. FIG. If the temperature detected by the upper thermistor 35 provided in the upper part of the hot water storage tank 20 is equal to or higher than a predetermined hot water supply temperature (YES in step S114), hot water can be supplied using the stored heat. is there. Therefore, it progresses to step S116 and the path | route form 2 shown in FIG. 8 is formed.
The predetermined temperature can be appropriately set depending on the piping capacity of the hot water supply path. If the accumulated heat is used up during the hot water supply, it is necessary to switch from the route form 2 for supplying hot water using the stored heat to the route form 3 (described later with reference to FIG. 9) for supplying hot water using the burner 57. Even during this switching, hot water is sent out from the hot water tank 20, and the temperature of the hot water sent out gradually decreases. For example, if the temperature that decreases during the switching of the path configuration is set as the predetermined temperature, the temperature of hot water to be supplied can be stabilized even if the path configuration is switched during the hot water supply.
As shown in FIG. 8, in the route configuration 2, the hot water tap 64 is opened and tap water is introduced into the bottom of the hot water tank 20 through the first common route 26, and the hot water in the upper part of the hot water tank 20 is used in the second common water. It is sent to the mixing unit 24 through the path 42. The hot water sent out to the mixing unit 24 is adjusted to a hot water supply set temperature, and hot water is supplied from the hot water tap 64 through the hot water supply path 51.

If the temperature detected by the upper thermistor 35 provided in the upper part of the hot water storage tank 20 is less than a predetermined temperature higher than the hot water supply set temperature (if NO) in step S114 of FIG. You can not hot water. Therefore, it progresses to step S118 and the route form 3 shown in FIG. 9 is formed.
As shown in FIG. 9, in the path configuration 3, the hot water tap 64 is opened and tap water is introduced into the bottom of the hot water tank 20 through the first common path 26, and the low temperature water at the top of the hot water tank 20 is the second. It is sent to the mixing unit 24 through the shared path 42. Further, the burner 57 is ignited, the heating pump 69 is driven in the forward rotation, the A port 86a and the B port 86b of the three-way valve 86 are communicated, and the bypass thermal valve (93: see FIG. 1) is opened. For this reason, in order from the cis turn 61, the cis turn forward path 68, the burner upstream path 71, the burner heat exchanger 60, the high temperature water path 73, the bypass path 92, the low temperature water path 70, the high temperature water path 73, and the cis turn return path 56 are passed. Thus, a heating path returning to the systern 61 is formed. The hot water in the heating path is heated by the burner 57, and when passing through the heat exchanger 53, the low-temperature water in the second shared path 42 is heated. The low temperature water in the second shared path 42 rises to a temperature equal to or higher than the hot water supply set temperature by this heating, and is sent out to the mixing unit 24. The hot water sent out to the mixing unit 24 is adjusted to a hot water supply set temperature, and hot water is supplied from the hot water tap 64 through the hot water supply path 51.

Processing A in step S14 in FIG. 2 is performed, and the hot water supply operation is performed until it is determined in step S16 in FIG. 2 that the hot water supply operation is stopped (YES). When it is determined that the hot water supply operation is stopped (YES in step S16), the process proceeds to step S34.
As described above, in this embodiment, when there is a hot water supply operation request during the power generation operation, the path form 1 of FIG. 7 is formed, and the hot water heated by the generated heat is not collected in the hot water tank 20, It can be sent directly to the mixing unit 24 and used for hot water supply. As a result, it is possible to suppress heat dissipation loss when hot water heated by power generation heat circulates in the piping or is stored in the hot water storage tank 20, and to supply hot water efficiently using the generated heat. it can.
Further, in this embodiment, when there is a hot water supply operation request while the power generation operation is stopped, if the amount of heat stored in the hot water storage tank 20 is sufficient, the path form 2 of FIG. Can be used for hot water supply. Thus, hot water can be supplied with high thermal efficiency.
Further, in this embodiment, the burner and the burner heat exchanger for directly heating the low-temperature water passing through the hot water supply path 51 are not provided, and heat is generated between the hot water in the heating path and the hot water in the hot water supply path. A heat exchanger 53 for performing the exchange is provided. If the power generation operation is stopped and the heat storage in the hot water storage tank 20 is insufficient, the path configuration 3 of FIG. 9 is formed, and the hot water in the heating path heated by the burner 57 passes through the hot water supply path 51. The low temperature water can be heated. As a result, the burner and the burner heat exchanger disposed in the heat source unit 22 can be reduced to one set, and the heat source unit 22 can be downsized.

If there is no hot water supply operation request in step S12 of FIG. 2 (NO), the process proceeds to step S18. In step S18, it is determined whether or not there is a floor heating operation request. If there is a floor heating operation request (YES in step S18), the process proceeds to step B of step S20.
In the process B, as shown in FIG. 4, it is determined in step S210 whether the power generation unit 110 is in a power generation operation. If the power generation operation is being performed (YES in step S210), the floor heating operation can be performed using the generated heat. Therefore, it progresses to step S212 and the path | route form 4 shown in FIG. 10 is formed.
As shown in FIG. 10, in the path form 4, the circulating pump 40 is driven in the forward rotation, and the low-temperature water sucked out from the bottom of the hot water tank 20 to the first common path 26 passes through the heat recovery forward path 128a to generate the power generation unit. 110, and is heated by generated heat. The heated hot water enters the second shared path 42 through the heat recovery return path 128b. At the same time, the heating pump 69 is driven in reverse rotation, the B port 86b and the A port 86a of the three-way valve 86 communicate with each other, the floor heating thermal valve (90: see FIG. 1) is opened, and the bypass thermal valve (93: 1) is closed. For this reason, in order from the cistern 61, a heating path that returns to the cistern 61 through the cistern return path 56, the high temperature water path 73, the low temperature water path 70, the floor heater 91, the low temperature water path 70, and the cistern forward path 68 is formed. The Since the A port 86 a and the B port 86 b of the three-way valve 86 communicate with each other, the hot water in the heating path passes through the heat exchanger 53. At this time, in the heat exchanger 53, the high-temperature water in the second shared path 42 heats the hot water in the heating path. The warm water in the heating path rises to a temperature required for floor heating operation (about 60 ° C. in this embodiment) or more by this heating, and warms the floor heater 91. The hot water in the second shared path passes through the heat exchanger 53 and decreases in temperature, and is introduced into the upper part of the hot water tank 20.

If the power generation unit 110 is not performing a power generation operation in step S210 of FIG. 4 (if NO), the floor heating operation cannot be performed using the generated heat. It progresses to step S214 and it is discriminate | determined whether there exists heat storage which can be utilized for floor heating operation in the hot water storage tank 20. FIG. If the temperature detected by the upper thermistor 35 provided in the upper part of the hot water tank 20 is 60 ° C. or higher (YES in step S214), the floor heating operation can be performed using the heat storage. Therefore, it progresses to step S216 and the path | route form 5 shown in FIG. 11 is formed.
As shown in FIG. 11, in the path form 5, the circulating pump 40 is driven in reverse rotation, and the high-temperature water sucked from the upper part of the hot water tank 20 to the second shared path 42 passes through the heat recovery return path 128b to generate the power generation unit. 110, enters the first shared path 26 through the heat recovery outward path 128a, and is introduced into the bottom of the hot water tank 20. At the same time, the heating pump 69 is driven to rotate in the forward direction, the A port 86a and the B port 86b of the three-way valve 86 communicate with each other, the floor heating thermal valve (90: see FIG. 1) is opened, and the bypass thermal valve (93: 1) is closed. For this reason, a heating path that returns to the cistern 61 through the cistern outgoing path 68, the low-temperature water path 70, the floor heater 91, the low-temperature water path 70, the high-temperature water path 73, and the cistern return path 56 is formed in this order. The Since the A port 86 a and the B port 86 b of the three-way valve 86 communicate with each other, the hot water in the heating path passes through the heat exchanger 53. At this time, in the heat exchanger 53, the high-temperature water in the second shared path 42 heats the hot water in the heating path. The warm water in the heating path rises to a temperature required for floor heating operation (about 60 ° C. in this embodiment) or more by this heating, and warms the floor heater 91. The hot water in the second shared path 42 whose temperature has decreased after passing through the heat exchanger 53 passes through the heat recovery return path 128b, the heat recovery forward path 128a, and the first shared path 26 in order, and is returned to the bottom of the hot water tank 20.

If the temperature detected by the upper thermistor 35 provided in the upper part of the hot water storage tank 20 does not reach a predetermined temperature higher than 60 ° C. (if NO) in step S214 in FIG. I can't do it. Therefore, it progresses to step S218 and the path | route form 6 shown in FIG. 12 is formed.
As shown in FIG. 12, in the path configuration 6, the burner 57 is ignited, the heating pump 69 is driven in the forward rotation, the C port 86c and the B port 86b of the three-way valve 86 communicate with each other, and the floor heating thermal valve (90 : See Fig. 1) and bypass heat operated valve (93: see Fig. 1). Therefore, in order from the cis turn 61, the cis turn outgoing path 68, the burner upstream path 71, the burner heat exchanger 60, the high temperature water path 73, the bypass path 92, the low temperature water path 70, the high temperature water path 73, the bypass path 52, and the cis turn return path. The first heating path that passes through 56 and returns to the cistern 61, and in turn from the cistern 61, the cistern outbound path 68, the low-temperature water path 70, the floor heater 91, the low-temperature water path 70, the high-temperature water path 73, the bypass path 52, A second heating path that passes through the cistern return path 56 and returns to the cistern 61 is formed. The hot water in the first heating path is heated by the burner 57 and the temperature rises, and the hot water in the cistern 61 also rises in temperature. The hot water whose temperature has risen to the temperature required for the floor heating operation (about 60 ° C. in the present embodiment) or higher in the first heating path is also sent into the second heating path to warm the floor heater 91.

Processing B in step S20 in FIG. 2 is performed, and the floor heating operation is performed until it is determined in step S22 in FIG. 2 that the floor heating operation is stopped (YES). When it is determined that the floor heating operation is stopped (YES in step S22), the process proceeds to step S34.
As described above, in this embodiment, when there is a floor heating operation request during the power generation operation, the path form 4 of FIG. 10 is formed, and the hot water heated by the generated heat and the hot water in the heating path are formed. Heat exchange can be carried out in this way, and the generated heat can be used for floor heating operation. This suppresses heat dissipation loss when the hot water heated by the generated heat circulates in the piping or is stored in the hot water tank 20, and efficiently uses the generated heat to perform floor heating operation. can do.
Further, in this embodiment, when there is a floor heating operation request while the power generation operation is stopped, if the heat storage amount in the hot water storage tank 20 is satisfied, the path form 5 of FIG. Heat storage can be used for floor heating operation. As a result, the floor heating operation can be performed efficiently.
Furthermore, in this embodiment, when the power generation operation is stopped and the heat storage in the hot water storage tank 20 is insufficient, the path form 6 of FIG. 12 is formed, and the hot water in the heating path can be heated by the burner 57. it can. This burner 57 is the same as the burner 57 used in the hot water supply operation shown in FIG. The burner and the burner heat exchanger disposed in the heat source unit 22 can be reduced to one set, and the heat source unit 22 can be downsized.

If there is no floor heating operation request in step S18 of FIG. 2 (NO), the process proceeds to step S24. In step S24, it is determined whether or not there has been a request for bathing. If there is a follow-up driving request (if YES in step S24), the process proceeds to process C in step S26.
In process C, as shown in FIG. 5, it is determined in step S310 whether the power generation unit 110 is in a power generation operation. If the power generation operation is in progress (YES in step S310), it is possible to perform a bath reheating operation using the generated heat. Accordingly, the process proceeds to step S312, and the path form 7 shown in FIG. 13 is formed.
As shown in FIG. 13, in the path configuration 7, the circulating pump 40 is driven in the forward rotation, and the low-temperature water sucked from the bottom of the hot water tank 20 to the first shared path 26 passes through the heat recovery forward path 128a to generate the power generation unit. 110, and is heated by generated heat. The heated hot water enters the second shared path 42 through the heat recovery return path 128b. At the same time, the heating pump 69 is driven in the reverse direction, the bath circulation pump 82 is driven in the reverse direction, and the B port 86b and the A port 86a of the three-way valve 86 communicate with each other, and the reheating heat valve (78: see FIG. 1) And the bypass thermal valve (93: see FIG. 1) is opened. Therefore, in order from the cis turn 61, the cis turn return path 56, the high temperature water path 73, the low temperature water path 70, the bypass path 92, the high temperature water path 73, the burner heat exchanger 60, the burner upstream path 71, and the cis turn forward path 68 are passed. The first heating path that returns to the cistern 61 and the cistern return path 56, the reheating path 77, the high-temperature water path 73, the burner heat exchanger 60, the burner upstream path 71, and the cistern outbound path 68 are sequentially passed from the cistern 61 Thus, a second heating path that returns to the cistern 61 is formed. Since the A port 86 a and the B port 86 b of the three-way valve 86 communicate with each other, the hot water in the first heating path passes through the heat exchanger 53. At this time, in the heat exchanger 53, the hot water in the first heating path is heated by the high-temperature water in the second shared path. By this heating, the temperature of the hot water in the first heating path rises to a temperature higher than the temperature required for the bath reheating operation (the reheating set temperature), and the temperature of the hot water in the systern 61 also rises. The hot water in the cistern 61 whose temperature has risen is also sent out into the second heating path. Hot water in the second heating path passes through the reheating heat exchanger 58. Further, since the bath circulation pump 82 is driven, the hot water from the bathtub 79 circulates in the bath circulation path 80. The hot water in the bath circulation path 80 also passes through the heat exchanger 58. Therefore, in the reheating heat exchanger 58, the hot water in the bath circulation path 80 is heated by the hot water from the cistern 61 whose temperature has increased. By this heating, the temperature of the hot water in the bathtub 79 rises to the reheating set temperature.

If the power generation unit 110 is not in the power generation operation at step S310 in FIG. 5 (if NO), the bath reheating operation cannot be performed using the generated heat. It progresses to step S314 and it is discriminate | determined whether there exists heat storage which can be utilized for the chasing operation in the hot water storage tank 20. FIG. If the temperature detected by the upper thermistor 35 provided at the upper part of the hot water tank 20 is equal to or higher than the reheating set temperature (YES in step S314), it is possible to perform reheating operation using heat storage. . Accordingly, the process proceeds to step S316, and the path configuration 8 shown in FIG. 14 is formed.
As shown in FIG. 14, in the route form 8, the circulating pump 40 is driven in reverse rotation, and the high-temperature water sucked out from the upper part of the hot water tank 20 to the second shared route 42 passes through the heat recovery return path 128b to generate the power generation unit. 110, enters the first shared path 26 through the heat recovery outward path 128a, and is introduced into the bottom of the hot water tank 20. At the same time, the heating pump 69 is driven to rotate in the forward direction so that the A port 86a and the B port 86b of the three-way valve 86 communicate with each other, and a reheating heat valve (78: see FIG. 1) and a bypass heat valve (93: see FIG. 1). ) Is opened. For this reason, in order from the cis turn 61, the cis turn forward path 68, the burner upstream path 71, the burner heat exchanger 60, the high temperature water path 73, the bypass path 92, the low temperature water path 70, the high temperature water path 73, and the cis turn return path 56 are passed. The first heating path returning to the cistern 61, and the cistern 61, the cistern outbound path 68, the burner upstream path 71, the burner heat exchanger 60, the high temperature water path 73, the reheating path 77, and the cistern return path 56 are sequentially passed. Thus, a second heating path that returns to the cistern 61 is formed. At this time, the hot water in the first heating path is heated by the high-temperature water in the second shared path 42 in the heat exchanger 53 and the temperature rises, and the temperature of the hot water in the cistern 61 rises. The hot water in the cistern 61 whose temperature has risen is also sent out into the second heating path. Hot water in the second heating path passes through the reheating heat exchanger 58. Further, since the bath circulation pump 82 is driven, the hot water from the bathtub 79 circulates in the bath circulation path 80. The hot water in the bath circulation path 80 also passes through the heat exchanger 58. Therefore, in the reheating heat exchanger 58, the hot water in the bath circulation path 80 is heated by the hot water from the cistern 61 whose temperature has increased. By this heating, the temperature of the hot water in the bathtub 79 rises to the reheating set temperature.

If the temperature detected by the upper thermistor 35 provided in the upper part of the hot water storage tank 20 does not satisfy the reheating set temperature in the step S314 in FIG. 5 (if NO), the reheating operation of the bath is performed using the heat storage. I can't do it. Therefore, it progresses to step S318 and the route form 9 shown in FIG. 15 is formed.
As shown in FIG. 15, in the route configuration 9, the burner 57 is ignited, the heating pump 69 is driven in the forward rotation, the C port 86 c and the B port 86 b of the three-way valve 86 communicate with each other, and a reheating heat valve (78 : See Fig. 1) and bypass heat operated valve (93: see Fig. 1). Therefore, in order from the cis turn 61, the cis turn outgoing path 68, the burner upstream path 71, the burner heat exchanger 60, the high temperature water path 73, the bypass path 92, the low temperature water path 70, the high temperature water path 73, the bypass path 52, and the cis turn return path. A first heating path that passes through 56 and returns to the cistern 61, and in turn from the cistern 61, a cistern outbound path 68, a burner upstream path 71, a burner heat exchanger 60, a hot water path 73, a reheating path 77, and a cistern return path A second heating path that passes through 56 and returns to the cistern 61 is formed. The hot water heated by the burner 57 and raised in temperature is sent out into the first and second heating paths. Hot water in the second heating path passes through the reheating heat exchanger 58. Further, since the bath circulation pump 82 is driven, the hot water from the bathtub 79 circulates in the bath circulation path 80. The hot water in the bath circulation path 80 also passes through the heat exchanger 58. Therefore, in the reheating heat exchanger 58, the hot water in the bath circulation path 80 is heated by the hot water in the heating path whose temperature has increased. By this heating, the temperature of the hot water in the bathtub 79 rises to the reheating set temperature.

Processing C in step S26 in FIG. 2 is performed, and the hot water supply operation is performed until it is determined in step S28 in FIG. 2 that the bath reheating operation has been stopped (YES). If it is determined that the bath chasing operation is stopped (YES in step S28), the process proceeds to step S34.
As described above, in this embodiment, when there is an operation request for bathing during the power generation operation, the path form 7 of FIG. 13 is formed, and the hot water heated by the generated heat and the hot water in the heating path are formed. In addition, heat is exchanged between the hot water in the heated heating path and the hot water in the bath circulation path 80 through which the hot water in the bathtub 79 circulates, and the generated heat is tracked. It can be used for driving. As a result, the hot water heated by the generated heat is circulated in the pipe or the heat loss when the hot water is stored in the hot water tank 20 is suppressed, and the bath is replenished by efficiently using the generated heat. You can drive.
Further, in this embodiment, when there is a request for reheating the bath while the power generation operation is stopped, if the amount of heat stored in the hot water storage tank 20 is sufficient, the path configuration 8 of FIG. 14 is formed, and the hot water storage tank The heat storage in 20 can be used for a chasing operation. As a result, the chasing operation can be performed efficiently.
Further, in this embodiment, when the power generation operation is stopped and the heat storage in the hot water storage tank 20 is insufficient, the path form 9 of FIG. 15 is formed, and the hot water in the heating path is heated by the burner 57 and heated. Heat exchange can be performed between the warm water in the heating path and the warm water in the bath circulation path 80 to perform a chasing operation. With one set of burner and burner heat exchanger, hot water supply operation, heating operation, and bath reheating operation can be performed, and the heat source unit 22 can be downsized.

If there is no request for reheating the bath in step S24 of FIG. 2 (if NO), there is no demand for heat, and the process proceeds to step D of step S30.
In the process D, as shown in FIG. 6, first, in step S400, it is determined whether or not heat can be stored in the hot water tank 20. If the temperature detected by the lower thermistor 36 provided in the lower part of the hot water tank 20 is 45 ° C. or higher (NO in step S400), the heat storage in the hot water tank 20 is full, and the hot water tank 20 is filled with heat. Can't store heat. Accordingly, the process proceeds to step S32 in FIG. On the other hand, if the temperature detected by the lower thermistor 36 provided in the lower part of the hot water tank 20 is less than 45 ° C., it is possible to store heat in the hot water tank 20. If it is determined that the hot water storage tank 20 can store heat (YES in step S400), the process proceeds to step S410.
In step S410, it is determined whether the power generation unit 110 is in a power generation operation. If the power generation operation is being performed (YES in step S410), the generated heat can be stored in the hot water tank 20. Accordingly, the process proceeds to step S412, and the path form 10 shown in FIG. 16 is formed.
As shown in FIG. 16, in the path configuration 10, the circulation pump 40 is driven in the forward rotation, and the low-temperature water sucked from the bottom of the hot water tank 20 to the first shared path 26 passes through the heat recovery forward path 128a to generate the power generation unit. 110, and is heated by generated heat. The heated hot water enters the second shared path 42 through the heat recovery return path 128 b and returns to the upper part of the hot water tank 20. In this way, the low temperature water in the lower part of the hot water tank 20 is sent to the power generation unit 110 and heated by the generated heat, and is converted into high temperature water and returned to the upper part of the hot water tank 20 so that the hot water temperature in the hot water tank 20 is increased. It rises and heat storage progresses.

In step S410 of FIG. 6, if the power generation unit 110 is not in a power generation operation (if NO), the generated heat cannot be stored in the hot water tank 20. Proceeding to step S414, it is determined whether or not there is a request to heat the hot water in the hot water tank 20.
If the hot water in the hot water tank is not used for a long time, there is no possibility that germs will propagate in the hot water tank 20. Therefore, when the hot water in the hot water storage tank 20 has not been used for a long time, it is preferable that the hot water in the hot water storage tank 20 can be sterilized by heating before using it. If the power generation operation is in progress, the above-described path form 10 can be formed to perform the heat storage operation, and the hot water in the hot water tank 20 can be sterilized by heat with the generated heat. However, when the power generation operation is stopped, the hot water in the hot water tank 20 cannot be heated by the generated heat. Therefore, in this embodiment, the hot water in the hot water tank 20 can be heated using the burner 57 when the power generation operation is stopped. Thereby, even when the power generation operation is stopped, the hot water in the hot water tank 20 can be sterilized by heating. When there is a hot water supply operation request during the heat sterilization operation, the hot water in the hot water storage tank 20 is controlled not to be used for hot water supply until the heat sterilization operation ends. The heat sterilization operation may be started by the user turning on a switch provided in the controller 23, or the time when the hot water in the hot water tank 20 is not used is counted and started by a timer. You may do it.
When there is a request to heat the hot water in the hot water storage tank 20 (YES in step S414), the process proceeds to step S416, and the path form 11 shown in FIG. 17 is formed.
As shown in FIG. 17, in the path form 11, the circulation pump 40 is driven in the forward rotation, and the low-temperature water sucked out from the bottom of the hot water tank 20 to the first shared path 26 passes through the heat recovery forward path 128a to generate the power generation unit. 110, and is sent to the second shared path 42 through the heat recovery return path 128b without being heated. The second shared path 42 passes through the heat exchanger 53. At the same time, the burner 57 is ignited, the heating pump 69 is driven in reverse rotation, the B port 86b and the A port 86a of the three-way valve 86 communicate with each other, and the bypass thermal valve (93: see FIG. 1) is opened. For this reason, in order from the cis turn 61, the cis turn return path 56, the high temperature water path 73, the low temperature water path 70, the bypass path 92, the high temperature water path 73, the burner heat exchanger 60, the burner upstream path 71, and the cis turn forward path 68 are passed. Thus, a heating path returning to the systern 61 is formed. Hot water in the heating path is heated by the burner 57. When the hot water in the heated heating path passes through the heat exchanger 53, the high temperature water in the heating path heats the hot water in the second shared path 42 in the heat exchanger 53. The warm water in the second shared path 42 rises to a temperature required for sterilization (about 60 ° C.) or higher by this heating and is introduced into the upper part of the hot water tank 20. When the temperature detected by the lower thermistor 36 of the hot water tank 20 reaches 60 ° C. and a predetermined time (for example, 1 hour) has elapsed, the heating operation is stopped.

Processing D in step S30 in FIG. 2 is performed, and if it is determined in step S32 in FIG. 2 that the heat storage operation is stopped (YES), the process proceeds to step S34.
As described above, in the present embodiment, when the heat storage in the hot water storage tank 20 is possible and the power generation operation is being performed, the path form 10 of FIG. 16 is formed, and the hot water in the hot water storage tank 20 is generated by the generated heat. Heat and store heat. In this way, heat generated during the absence of hot water is stored until there is a demand, and when there is a hot water supply operation request, floor heating operation request, or bath reheating operation request It can be used effectively. The generated heat can be used efficiently.
Further, in this embodiment, when there is room for heat storage in the hot water storage tank 20 and the power generation operation is stopped, if there is a heating request for heat sterilization of the hot water in the hot water storage tank 20, the route of FIG. Form 11 can be formed, and the hot water in the hot water tank 20 can be heated and sterilized using the burner 57.
In step S34, the processes from step S12 to step S32 are repeated until the power of the cogeneration system is turned off (YES).

  In the cogeneration system of the present embodiment, if the hot water in the heating path is hotter than the hot water in the second shared path 42, the heat exchanger 53 causes the hot water in the heating path to pass through the second shared path 42. Hot water can be heated. Therefore, when the power generation operation is stopped and there is no heat storage available in the hot water storage tank 20, the hot water in the heating path is heated by the burner 57, and the low temperature in the second shared path 42 is heated by the high temperature water in the heating path. Water can be heated. Therefore, even if the hot water supply path is not provided with a burner and a burner heat exchanger, the hot water in the hot water supply path can be heated using the burner 57 and the burner heat exchanger 60 provided in the heating path. Since the heater composed of the burner and the burner heat exchanger disposed in the system can be reduced to one set while having the hot water supply path and the heating path, the system can be reduced in size.

In the cogeneration system according to the present embodiment, if the hot water in the second shared path 42 is hotter than the hot water in the heating path, the heat exchanger 53 causes the hot water in the second shared path 42 to be heated in the heating path. Low temperature water can be heated. Conversely, if the hot water in the heating path is hotter than the hot water in the second shared path 42, the hot water in the second shared path 42 may be heated by the high temperature water in the heating path in the heat exchanger 53. it can. Further, if the hot water in the heating path is hotter than the hot water in the bath circulation path 80, the reheating heat exchanger 58 heats the low-temperature water in the bath circulation path 80 with the high-temperature water in the heating path. It is possible to drive in the future.
During the power generation operation, the high-temperature water heated by the generated heat can be circulated in the second shared path 42, and in the heat exchanger 53, the high-temperature water heated by the generated heat in the heating path Low temperature water can be heated. In other words, hot water supply operation can be performed using high-temperature water heated by the generated heat, and heating operation (floor heating operation) is performed by heating the hot water in the heating path with the high-temperature water heated by the generated heat. Can do.
Even when the power generation operation is stopped, when there is heat storage available in the hot water storage tank 20, high-temperature water from the hot water storage tank 20 can be circulated in the second shared path 42, and in the heat exchanger 53, The low temperature water in the heating path can be heated with the high temperature water from the hot water tank 20. That is, the hot water supply operation can be performed using the high-temperature water stored in the hot water tank 20, and the hot water stored in the hot water tank 20 is heated to heat the hot water in the heating path (heating operation ( Floor heating operation).
Even when the power generation operation is stopped and there is no heat storage available in the hot water storage tank 20, the hot water in the heating path can be heated by the burner 57, and the heat exchanger 53 The low temperature water in the second shared path 42 can be heated by the high temperature water. That is, the hot water in the heating path can be heated by the burner 57 and the heating operation can be performed, and the hot water in the hot water supply path can be heated with the high-temperature water in the heating path heated by the burner 57. it can.
From the above, according to the cogeneration system of the present embodiment, when any one of hot water supply operation, heating operation, and bath reheating operation is performed, the generated heat and hot water storage tank are matched to the operation status of the system. It is possible to operate by selecting an optimum heating means from among the heat storage inside and the burner 57. Operation with excellent thermal efficiency can be performed.
Moreover, since the hot water in the heating path can be heated by the burner 57 and the hot water in the heat storage operation path can be heated by the heated hot water, the hot water in the hot water storage tank 20 can be used even when the power generation operation is stopped. Can be sterilized by heating.

  When the heating operation is performed while heating the hot water in the heating path by the burner 57, if the hot water in the heating path circulates in the path passing through the heat exchanger 53, the hot water stays in the second shared path 42. Heat is lost to low-temperature water, and thermal efficiency is poor. In the cogeneration system of the present embodiment, the path through which the hot water in the heating path passes through the heat exchanger 53 and the path through which the heat exchanger 53 is bypassed can be switched according to the operation status of the system. According to this, the thermal energy in the heating path can be used for heating operation without being taken away by the low-temperature water staying in the second shared path, and the thermal efficiency of the system is further improved.

In the cogeneration system of this embodiment, the circulation pump 40 disposed in the heat recovery circulation path, the heating pump 69 disposed in the heating path, and the bath circulation pump disposed in the bath circulation path 80. Both 82 can rotate forward and backward. Thereby, the circulation direction of the hot water in each path can be switched so that the thermal efficiency becomes higher in accordance with the operation state of the system.
If the heat recovery circulation path, the heating path, and the hot water in the bath circulation path 80 can be circulated in the opposite directions, all of these paths may be connected to the normal ports such as the pumps 40, 69, and 82. There is no need to provide a pump that can rotate and reversely rotate. For example, a part of these circulation paths is made parallel, and a pump for changing the circulation direction is arranged one by one, and the pump that can circulate in the direction to be circulated is driven. An effect equivalent to that of the embodiment can be obtained.

(Example 2)
A second embodiment embodying the cogeneration system of the present invention will be described with reference to the drawings. The configuration of the cogeneration system of the present embodiment is similar to the configuration of the cogeneration system of the first embodiment. Below, the difference between the cogeneration system of the present embodiment and the cogeneration system of the first embodiment will be mainly described, and the description of the same points will be omitted. The common members will be described using the reference numerals used in the first embodiment.
As shown in FIG. 18, the cogeneration system of the present embodiment does not include the heat exchanger 53 included in the cogeneration system of the first embodiment. In the cogeneration system of the present embodiment, a plate coil type heat exchanger 153 is provided in the upper part outside the hot water tank 20 in place of the heat exchanger 53. The plate coil heat exchanger 153 is attached so as to be wound around the hot water storage tank 20 via a heat transfer cement. The hot water in the heating path passes through the plate coil heat exchanger 153 on the downstream side of the heating terminal 76. When the A port 86a and the B port 86b of the three-way valve 86 are open and communicated and the C port 86c is closed, a path passing through the plate coil heat exchanger 153 is formed. When the C port 86c and the B port 86b of the three-way valve 86 are open and communicated, and the A port 86a is closed, a path that bypasses the plate coil heat exchanger 153 is formed. When a path passing through the plate coil heat exchanger 153 is formed, the plate coil heat exchanger 153 performs heat exchange between the hot water in the heating path and the hot water in the upper part of the hot water tank 20.

As described above, the configuration of the cogeneration system of the present embodiment is different from the configuration of the cogeneration system of the first embodiment. However, since the upper part in the hot water tank 20 and the second shared path 42 are connected, the hot water temperature in the upper part of the hot water tank 20 and the hot water temperature in the second shared path 42 can be regarded as substantially equal. Therefore, in the plate coil type heat exchanger 153, the action obtained by exchanging heat between the hot water in the heating path and the hot water in the upper part of the hot water tank 20, and the heat exchanger of the cogeneration system of the first embodiment. In 53, the effect | action obtained by performing heat exchange with the warm water in a heating path | route and the warm water in the 2nd shared path | route 42 is substantially equivalent.
Also in the cogeneration system of the present embodiment, the circulation pump 40 disposed in the heat recovery circulation path, the heating pump 69 disposed in the heating path, and the bath circulation pump disposed in the bath circulation path 80. Both 82 can rotate forward and backward. However, in the present embodiment, these pumps 40, 69 and 82 may not be able to rotate in reverse.

  In the cogeneration system according to the present embodiment shown in FIG. 18, the first common path 26, which is a water supply path for sending tap water to the mixing unit 24 and the hot water tank 20, from the bottom of the hot water tank 20, as in the first embodiment. The hot water is also used as a heat recovery circulation path for sending the hot water to the heat exchangers 116 and 118 in the power generation unit 110. Further, the second shared path 42 that is a return path for collecting the generated heat into the hot water tank 20 is also used as a path for sending the hot water from the hot water tank 20 to the mixing unit 24. The second shared path 42 and the heating path (high-temperature water path 73) are configured to pass through the plate coil heat exchanger 153 attached to the hot water tank 20, while the heating path includes A path that bypasses the plate coil heat exchanger 153 is also prepared. The burner and burner heat exchanger provided in the heat source unit 22 is only one set of the burner 57 and the burner heat exchanger 60 arranged in the heating path. Therefore, when performing hot water supply operation, floor heating operation, bath renewal, and heat storage operation, a plurality of path forms can be formed. Further, as means for heating the hot water in the path, any one of the generated heat generated in the power generation unit 110, the heat storage in the hot water tank 20, and the gas combustion type burner 57 can be used. The route form is determined by selecting the most suitable heating means suitable for the operation status of the system. The optimum route form is determined by the processing shown in FIGS. 2 to 6 as in the first embodiment. Several forms of paths formed in this embodiment are shown in FIGS. A path indicated by a solid line in the figure indicates that hot water is circulating or circulating in the path, and an arrow indicates a flowing direction or a circulating direction of the hot water.

A route form formed in the cogeneration system of the present embodiment will be described. As described above, the difference between the configuration of the cogeneration system of the first embodiment and the configuration of the cogeneration system of the present embodiment is the heat exchanger (heat exchanger 53 or plate coil heat exchanger 153). . Therefore, in the following, when the path form formed in the cogeneration system of the present embodiment is one that does not pass through the plate coil heat exchanger 153, the path form formed in the cogeneration system of the first embodiment Since they are the same, illustration and explanation of the route form are omitted.
In FIG. 2, if the power of the cogeneration system is turned on (YES in step S10), and there is a hot water supply operation request (YES in step S12), the process proceeds to process A in step S14.
In the process A, as shown in FIG. 3, if the power generation operation is being performed (YES in step S110), it is possible to supply hot water using generated heat. Therefore, it progresses to step S112 and the same route form as the route form 1 shown in FIG. 7 is formed.

  In FIG. 3, the power generation unit 110 is not in a power generation operation (NO in step S110), and the temperature detected by the upper thermistor 35 provided in the upper part of the hot water tank 20 is equal to or higher than a temperature higher than the hot water supply set temperature. If (if YES at step S114), it is possible to supply hot water using heat storage. Accordingly, the process proceeds to step S116, and the same route form as the route form 2 shown in FIG. 8 is formed.

If the temperature detected by the upper thermistor 35 provided in the upper part of the hot water tank 20 is less than a predetermined temperature higher than the hot water supply set temperature (if NO) in step S114 of FIG. 3, the process proceeds to step S118. A path form 3p shown in FIG. 19 is formed.
As shown in FIG. 19, in the path configuration 3p, the hot water tap 64 is opened and tap water is introduced into the bottom of the hot water tank 20 through the first common path 26, and the low-temperature water at the top of the hot water tank 20 is the second. It is sent to the mixing unit 24 through the shared path 42. Further, the burner 57 is ignited, the heating pump 69 is driven in the forward rotation, the A port 86a and the B port 86b of the three-way valve 86 are communicated, and the bypass thermal valve (93: see FIG. 1) is opened. For this reason, in order from the cis turn 61, the cis turn forward path 68, the burner upstream path 71, the burner heat exchanger 60, the high temperature water path 73, the bypass path 92, the low temperature water path 70, the high temperature water path 73, and the cis turn return path 56 are passed. Thus, a heating path returning to the systern 61 is formed. The hot water in the heating path is heated by the burner 57 and heats the low temperature water in the upper part of the hot water tank 20 when passing through the plate coil heat exchanger 153. The low temperature water in the hot water storage tank 20 rises to a temperature equal to or higher than the hot water supply set temperature by this heating, and is sent out to the mixing unit 24. The hot water sent out to the mixing unit 24 is adjusted to a hot water supply set temperature, and hot water is supplied from the hot water tap 64 through the hot water supply path 51.

If the process A of step S14 of FIG. 2 is performed and it is determined that the hot water supply operation is stopped (YES in step S16), the process proceeds to step S34.
As described above, in this embodiment, when there is a hot water supply operation request during the power generation operation, the same path form as the path form 1 of FIG. 7 is formed, and the hot water heated by the generated heat is stored in the hot water tank 20. In this case, the water can be directly sent to the mixing unit 24 and used for hot water supply. As a result, it is possible to suppress heat dissipation loss when hot water heated by power generation heat circulates in the piping or is stored in the hot water storage tank 20, and to supply hot water efficiently using the generated heat. it can.
Further, in this embodiment, when there is a hot water supply operation request while the power generation operation is stopped, if the heat storage amount in the hot water storage tank 20 is satisfied, the same route configuration as the route configuration 2 of FIG. Hot water in the tank 20 can be used for hot water supply. Thus, hot water can be supplied with high thermal efficiency.
Further, in this embodiment, the burner and the burner heat exchanger for directly heating the hot water or water passing through the hot water supply path are not provided, and the hot water in the heating path and the hot water in the hot water storage tank 20 are not provided. A plate coil type heat exchanger 153 for performing heat exchange is provided. If the power generation operation is stopped and the heat storage in the hot water storage tank 20 is insufficient, the low temperature in the hot water storage tank 20 is formed by the hot water in the heating path that forms the path configuration 3p of FIG. Water can be heated and used for hot water supply. As a result, the burner and the burner heat exchanger disposed in the heat source unit 22 can be reduced to one set, and the heat source unit 22 can be downsized.

In FIG. 2, if there is no hot water supply operation request (NO in step S12) and there is a floor heating operation request (YES in step S18), the process proceeds to step B in step S20.
In the process B, as shown in FIG. 4, if the power generation operation is being performed (YES in step S210), the floor heating operation can be performed using the generated heat. Therefore, it progresses to step S212 and the path | route form 4p shown in FIG. 20 is formed.
As shown in FIG. 20, in the path configuration 4p, the circulation pump 40 is driven in the forward rotation, and the low-temperature water sucked out from the bottom of the hot water tank 20 to the first shared path 26 passes through the heat recovery forward path 128a to generate the power generation unit. 110, and is heated by generated heat. The heated hot water enters the second shared path 42 through the heat recovery return path 128 b and returns to the upper part of the hot water tank 20. As the power generation operation proceeds, the hot water in the hot water tank 20 rises from the top. At the same time, the heating pump 69 is driven to rotate in the forward direction, the A port 86a and the B port 86b of the three-way valve 86 communicate with each other, the floor heating thermal valve (90: see FIG. 1) is opened, and the bypass thermal valve (93: 1) is closed. For this reason, a heating path that returns to the cistern 61 through the cistern outgoing path 68, the low-temperature water path 70, the floor heater 91, the low-temperature water path 70, the high-temperature water path 73, and the cistern return path 56 is formed in this order. The Since the A port 86 a and the B port 86 b of the three-way valve 86 communicate with each other, the hot water in the heating path passes through the plate coil heat exchanger 153. At this time, in the plate coil type heat exchanger 153, the hot water in the upper part of the hot water tank 20 heats the hot water in the heating path. The warm water in the heating path rises to a temperature required for floor heating operation (about 60 ° C. in this embodiment) or more by this heating, and warms the floor heater 91. The temperature of the hot water in the hot water storage tank 20 near the mounting position of the plate coil heat exchanger 153 decreases.

In FIG. 4, when the power generation unit 110 is not in a power generation operation (NO in step S210) and the temperature detected by the upper thermistor 35 provided on the upper part of the hot water tank 20 is 60 ° C. or higher (YES in step S214). If so, it is possible to perform floor heating operation using heat storage. Accordingly, the process proceeds to step S216, and the path form 5p shown in FIG. 21 is formed.
As shown in FIG. 21, in the path configuration 5p, the heating pump 69 is driven in the forward rotation, the A port 86a and the B port 86b of the three-way valve 86 communicate with each other, and the floor heating thermal valve (90: see FIG. 1) The bypass thermal valve (93: see FIG. 1) is closed. For this reason, a heating path that returns to the cistern 61 through the cistern outgoing path 68, the low-temperature water path 70, the floor heater 91, the low-temperature water path 70, the high-temperature water path 73, and the cistern return path 56 is formed in this order. The Since the A port 86 a and the B port 86 b of the three-way valve 86 communicate with each other, the hot water in the heating path passes through the plate coil heat exchanger 153. At this time, in the plate coil heat exchanger 153, the high temperature water in the hot water tank 20 heats the hot water in the heating path. The warm water in the heating path rises to a temperature required for floor heating operation (about 60 ° C. in this embodiment) or more by this heating, and warms the floor heater 91. Since the A port 86 a and the B port 86 b of the three-way valve 86 communicate with each other, the hot water in the heating path passes through the plate coil heat exchanger 153. At this time, in the plate coil heat exchanger 153, the high temperature water in the hot water tank 20 heats the hot water in the heating path. The warm water in the heating path rises to a temperature required for floor heating operation (about 60 ° C. in this embodiment) or more by this heating, and warms the floor heater 91. The temperature of the hot water in the hot water storage tank 20 near the mounting position of the plate coil heat exchanger 153 decreases.

  In FIG. 4, if the temperature detected by the upper thermistor 35 provided in the upper part of the hot water tank 20 does not reach a temperature higher than the predetermined temperature by 60 ° C. (NO in step S214), the floor heating operation is performed using the heat storage. I can't do it. Accordingly, the process proceeds to step S218, and the same route form as the route form 6 shown in FIG. 12 is formed.

When the process B of step S20 in FIG. 2 is performed and the stop of the floor heating operation is determined (YES in step S22), the process proceeds to step S34.
As described above, in this embodiment, when there is a floor heating operation request during the power generation operation, the hot water stored in the hot water storage tank 20 is formed by forming the path configuration 4p of FIG. Heat exchange can be performed with hot water in the heating path, and the generated heat can be used for floor heating operation. Thereby, the floor heating operation can be performed by efficiently using the heat storage in the hot water tank 20.
Further, in this embodiment, when there is a floor heating operation request while the power generation operation is stopped, if the amount of heat stored in the hot water storage tank 20 is satisfied, the path form 5p of FIG. Heat storage can be used for floor heating operation. As a result, the floor heating operation can be performed efficiently.
Further, in this embodiment, when the power generation operation is stopped and the heat storage in the hot water tank 20 is insufficient, the same route form as the route form 6 of FIG. Can be heated. The burner 57 can also be used to heat the hot water in the hot water supply path. The burner and the burner heat exchanger disposed in the heat source unit 22 can be reduced to one set, and the heat source unit 22 can be downsized.

In FIG. 2, if there is no floor heating operation request (NO in step S18) and there is a follow-up operation request (YES in step S24), the process proceeds to process C in step S26.
In the process C, as shown in FIG. 5, if the power generation operation is being performed (YES in step S310), the bath reheating operation can be performed using the generated heat. Accordingly, the process proceeds to step S312, and the path form 7p shown in FIG. 22 is formed.
As shown in FIG. 22, in the path configuration 7p, the circulation pump 40 is driven in the forward rotation, and the low-temperature water sucked from the bottom of the hot water tank 20 to the first shared path 26 passes through the heat recovery forward path 128a to generate the power generation unit. 110, and is heated by generated heat. The heated hot water enters the second shared path 42 through the heat recovery return path 128 b and returns to the upper part of the hot water tank 20. As the power generation operation proceeds, the hot water in the hot water tank 20 rises from the top. At the same time, the heating pump 69 is driven in the forward direction, the bath circulation pump 82 is driven in the forward direction, and the A port 86a and the B port 86b of the three-way valve 86 communicate with each other, and a reheating heat valve (78: see FIG. 1). And the bypass thermal valve (93: see FIG. 1) is opened. For this reason, in order from the cis turn 61, the cis turn forward path 68, the burner upstream path 71, the burner heat exchanger 60, the high temperature water path 73, the bypass path 92, the low temperature water path 70, the high temperature water path 73, and the cis turn return path 56 are passed. The first heating path returning to the cistern 61, and the cistern 61, the cistern outbound path 68, the burner upstream path 71, the burner heat exchanger 60, the high temperature water path 73, the reheating path 77, and the cistern return path 56 are sequentially passed. Thus, a second heating path that returns to the cistern 61 is formed. Since the A port 86a and the B port 86b of the three-way valve 86 communicate with each other, the hot water in the first heating path passes through the plate coil heat exchanger 153. At this time, in the plate coil type heat exchanger 153, the hot water in the upper part of the hot water tank 20 heats the hot water in the heating path. The hot water in the first heating path rises to a temperature higher than the temperature required for the bath reheating operation (reheating set temperature) by this heating, and the temperature of the hot water in the systern 61 also rises. The hot water in the cistern 61 whose temperature has risen is also sent out into the second heating path. Hot water in the second heating path passes through the reheating heat exchanger 58. Further, since the bath circulation pump 82 is driven, the hot water from the bathtub 79 circulates in the bath circulation path 80. The hot water in the bath circulation path 80 also passes through the heat exchanger 58. Therefore, in the reheating heat exchanger 58, the hot water in the bath circulation path 80 is heated by the hot water from the cistern 61 whose temperature has increased. By this heating, the temperature of the hot water in the bathtub 79 rises to the reheating set temperature.

In FIG. 5, if the power generation unit 110 is not in a power generation operation (NO in step S310) and the temperature detected by the upper thermistor 35 provided in the upper part of the hot water tank 20 is equal to or higher than the reheating set temperature (step S314). If YES, it is possible to carry out a chasing operation using heat storage. Accordingly, the process proceeds to step S316, and the path form 8p shown in FIG. 23 is formed.
As shown in FIG. 23, in the path configuration 8p, the heating pump 69 is driven in the forward rotation, the A port 86a and the B port 86b of the three-way valve 86 communicate with each other, and a reheating thermal valve (78: see FIG. 1). The bypass thermal valve (93: see FIG. 1) is opened. For this reason, in order from the cis turn 61, the cis turn forward path 68, the burner upstream path 71, the burner heat exchanger 60, the high temperature water path 73, the bypass path 92, the low temperature water path 70, the high temperature water path 73, and the cis turn return path 56 are passed. The first heating path returning to the cistern 61, and the cistern 61, the cistern outbound path 68, the burner upstream path 71, the burner heat exchanger 60, the high temperature water path 73, the reheating path 77, and the cistern return path 56 are sequentially passed. Thus, a second heating path that returns to the cistern 61 is formed. Since the A port 86a and the B port 86b of the three-way valve 86 communicate with each other, the hot water in the first heating path passes through the plate coil heat exchanger 153. At this time, in the plate coil type heat exchanger 153, the hot water in the upper part of the hot water tank 20 heats the hot water in the heating path. The hot water in the first heating path rises to a temperature higher than the temperature required for the bath reheating operation (reheating set temperature) by this heating, and the temperature of the hot water in the systern 61 also rises. The hot water in the cistern 61 whose temperature has risen is also sent out into the second heating path. Hot water in the second heating path passes through the reheating heat exchanger 58. Further, since the bath circulation pump 82 is driven, the hot water from the bathtub 79 circulates in the bath circulation path 80. The hot water in the bath circulation path 80 also passes through the heat exchanger 58. Therefore, in the reheating heat exchanger 58, the hot water in the bath circulation path 80 is heated by the hot water from the cistern 61 whose temperature has increased. By this heating, the temperature of the hot water in the bathtub 79 rises to the reheating set temperature.

  In FIG. 5, if the temperature detected by the upper thermistor 35 provided in the upper part of the hot water tank 20 does not satisfy the reheating set temperature (NO in step S314), the reheating operation of the bath is performed using the heat storage. I can't do it. Accordingly, the process proceeds to step S318, and the same route form as the route form 9 shown in FIG. 15 is formed.

When the process C of step S26 in FIG. 2 is performed and it is determined that the bath chase operation is stopped (YES in step S28), the process proceeds to step S34.
As described above, in this embodiment, when there is a request for reheating the bath during the power generation operation, the path form 7p of FIG. 22 is formed, heated by the generated heat, and stored in the hot water tank 20. Heat is exchanged between the hot water in the heating path and the hot water in the heating path. Further, heat is exchanged between the heated hot water in the heating path and the hot water in the bath circulation path 80 through which the hot water in the bathtub 79 circulates. Exchanges can be made and the generated heat can be used for chasing. As a result, it is possible to perform a bath reheating operation by efficiently using the heat storage in the hot water tank 20.
Further, in this embodiment, when there is a request for reheating the bath while the power generation operation is stopped, if the amount of heat stored in the hot water storage tank 20 is sufficient, the path configuration 8p of FIG. 23 is formed, and the hot water storage tank The heat storage in 20 can be used for a chasing operation. As a result, the chasing operation can be performed efficiently.
Further, in this embodiment, when the power generation operation is stopped and the heat storage in the hot water tank 20 is insufficient, the same route form as the route form 9 of FIG. It is possible to perform a chasing operation by exchanging heat between the heated warm water in the heating path and the warm water in the bath circulation path 80. The burner 57 can also be used to heat the hot water in the hot water supply path. The burner and the burner heat exchanger disposed in the heat source unit 22 can be reduced to one set, and the heat source unit 22 can be downsized.

In FIG. 2, if there is no request for bathing (NO in step S24), there is no demand for heat, and the process proceeds to process D in step S30.
In the process D, as shown in FIG. 6, first, in step S400, it is determined whether or not heat can be stored in the hot water tank 20. If the temperature detected by the lower thermistor 36 provided in the lower part of the hot water tank 20 is 45 ° C. or higher (NO in step S400), the heat storage in the hot water tank 20 is full, and the hot water tank 20 is filled with heat. Can't store heat. Accordingly, the process proceeds to step S32 in FIG. On the other hand, if the temperature detected by the lower thermistor 36 provided in the lower part of the hot water tank 20 is less than 45 ° C., it is possible to store heat in the hot water tank 20. If it is determined that the hot water storage tank 20 can store heat (YES in step S400), the process proceeds to step S410.
In step S410, it is determined whether the power generation unit 110 is in a power generation operation. If the power generation operation is being performed (YES in step S410), the generated heat can be stored in the hot water tank 20. Accordingly, the process proceeds to step S412, and the same route form as the route form 10 shown in FIG. 16 is formed.

In FIG. 6, when the power generation operation is stopped in the power generation unit 110 (NO in step S410) and there is a request to heat the hot water in the hot water storage tank 20 (YES in step S414), the process proceeds to step S416. As a result, the path form 11p shown in FIG. 24 is formed.
As shown in FIG. 24, in the path configuration 11p, the circulating pump 40 is driven in the forward rotation, and the low-temperature water sucked from the bottom of the hot water tank 20 to the first common path 26 passes through the heat recovery forward path 128a to generate the power generation unit. 110, the second common path 42 is entered through the heat recovery return path 128b without being heated, and returns to the upper part of the hot water tank 20. At the same time, the burner 57 is ignited, the heating pump 69 is driven in the forward rotation, the A port 86a and the B port 86b of the three-way valve 86 are communicated, and the bypass thermal valve (93: see FIG. 1) is opened. For this reason, in order from the cis turn 61, the cis turn forward path 68, the burner upstream path 71, the burner heat exchanger 60, the high temperature water path 73, the bypass path 92, the low temperature water path 70, the high temperature water path 73, and the cis turn return path 56 are passed. Thus, a heating path returning to the systern 61 is formed. Hot water in the heating path is heated by the burner 57. When the heated hot water in the heating path passes through the plate coil heat exchanger 153, the hot water in the heating path heats the upper hot water in the hot water storage tank 20 in the plate coil heat exchanger 153. The temperature of the hot water in the hot water tank 20 rises to a temperature necessary for sterilization (about 60 ° C.) or higher by this heating. When the temperature detected by the lower thermistor 36 of the hot water tank 20 reaches 60 ° C. and a predetermined time (for example, 1 hour) has elapsed, the heating operation is stopped.

Processing D in step S30 in FIG. 2 is performed, and if it is determined in step S32 in FIG. 2 that the heat storage operation is stopped (YES), the process proceeds to step S34.
As described above, in the present embodiment, when the heat storage in the hot water storage tank 20 is possible and the power generation operation is being performed, the same path form as the path form 10 in FIG. 16 is formed, and the hot water storage tank is generated by the generated heat. The hot water in 20 is heated and stored. In this way, heat generated during the absence of hot water is stored until there is a demand, and when there is a hot water supply operation request, floor heating operation request, or bath reheating operation request It can be used effectively. The generated heat can be used efficiently.
Further, in this embodiment, when there is room for heat storage in the hot water storage tank 20 and the power generation operation is stopped, if there is a heating request for heat sterilization of the hot water in the hot water storage tank 20, the route of FIG. Form 11p can be formed and the hot water in the hot water tank 20 can be sterilized by heating using the burner 57.
In step S34, the processes from step S12 to step S32 are repeated until the power of the cogeneration system is turned off (YES).

  In the cogeneration system of the present embodiment, if the hot water in the heating path is hotter than the hot water in the upper part of the hot water storage tank 20, the hot water in the heating path causes the hot water in the plate coil heat exchanger 153. The hot water at the top of the can be heated. Therefore, when the power generation operation is stopped and there is no heat storage available in the hot water storage tank 20, the hot water in the heating path is heated by the burner 57, and the low temperature water in the hot water storage tank 20 is heated by the high temperature water in the heating path. Can be heated. Therefore, even if the hot water supply path is not provided with a burner and a burner heat exchanger, the hot water in the hot water supply path can be heated using the burner 57 and the burner heat exchanger 60 provided in the heating path. Since the heater composed of the burner and the burner heat exchanger disposed in the system can be reduced to one set while having the hot water supply path and the heating path, the system can be reduced in size.

In the cogeneration system of the present embodiment, if the hot water in the upper part of the hot water tank 20 is hotter than the hot water in the heating path, the plate coil heat exchanger 153 is heated by the hot water in the upper part of the hot water tank 20. Low temperature water in the path can be heated. On the contrary, if the hot water in the heating path is higher than the hot water in the upper part of the hot water tank 20, the hot water in the upper part of the hot water tank 20 is heated by the hot water in the heating path in the plate coil heat exchanger 153. can do. Further, if the hot water in the heating path is hotter than the hot water in the bath circulation path 80, the reheating heat exchanger 58 heats the low-temperature water in the bath circulation path 80 with the high-temperature water in the heating path. It is possible to drive in the future.
During the power generation operation, the hot water heated by the generated heat can be stored in the hot water storage tank 20 and can be circulated in the second common path 42 as needed, and in the plate coil heat exchanger 153 The low temperature water in the heating path can be heated by the high temperature water in the upper part of the hot water tank 20. That is, the hot water supply operation can be performed using the high temperature water heated by the generated heat, and the warm water in the heating path is heated by the high temperature water in the upper part of the hot water tank 20 to perform the heating operation (floor heating operation). be able to.
Even when the power generation operation is stopped, when there is heat storage available in the hot water storage tank 20, high-temperature water from the hot water storage tank 20 can be circulated in the second shared path 42, and a plate coil heat exchanger In 153, the low temperature water in the heating path can be heated with the high temperature water in the upper part of the hot water tank 20. That is, the hot water supply operation can be performed using the high temperature water stored in the upper part of the hot water tank 20, and the hot water in the heating path is heated by the high temperature water stored in the upper part of the hot water tank 20. Heating operation (floor heating operation) can be performed.
Even when the power generation operation is stopped and there is no heat storage available in the hot water storage tank 20, the hot water in the heating path can be heated by the burner 57, and the plate coil heat exchanger 153 performs heating. The low temperature water in the upper part of the hot water tank 20 can be heated by the high temperature water in the path. That is, the hot water in the heating path can be heated by the burner 57, and the hot water in the upper part of the hot water tank 20 is heated by the high-temperature water in the heating path heated by the burner 57. Can be used.
From the above, according to the cogeneration system of the present embodiment, when any one of hot water supply operation, heating operation, and bath reheating operation is performed, the generated heat and hot water storage tank are matched to the operation status of the system. It is possible to operate by selecting an optimum heating means from among the heat storage inside and the burner 57. Operation with excellent thermal efficiency can be performed.
Moreover, since the hot water in the heating path can be heated by the burner 57 and the hot water in the heat storage operation path can be heated by the heated hot water, the hot water in the hot water storage tank 20 can be used even when the power generation operation is stopped. Can be sterilized by heating.

  In the cogeneration system of the present embodiment, the path through which the hot water in the heating path passes through the plate coil type heat exchanger 153 and the path through which the plate coil type heat exchanger 153 is bypassed are switched according to the operation status of the system. be able to. According to this, when the heating operation is performed while the hot water in the heating path is heated by the burner 57, the thermal energy in the heating path is lost to the low-temperature water staying in the second shared path. It can be used for heating operation without any problem, and the thermal efficiency of the system is further improved.

The cogeneration system of the present embodiment includes a plate coil heat exchanger 153 as means for exchanging heat between the water in the hot water storage tank and the water in the heating path. The plate coil type heat exchanger 153 can exchange heat between the water flowing through the plate coil type heat exchanger 153 and the water inside the hot water tank 20 by being attached to the outside of the hot water tank 20. Unlike the heat exchanger attached to the hot water tank 20, the heat exchanger attached to the outside of the hot water tank 20 like the plate coil type heat exchanger 153, even if the heat exchanger is damaged by corrosion, There is no problem that the water circulating in the heat exchanger leaks into the hot water tank 20 and contaminates the water in the hot water tank 20.
In the cogeneration system of the present embodiment, the plate coil type heat exchanger 153 is provided as means for exchanging heat between the water in the hot water storage tank and the water in the heating path, but is disposed outside the hot water storage tank. If it is a heat exchanger, it is not restricted to the plate coil type heat exchanger 153 in particular.

  In the first embodiment and the second embodiment, in the cogeneration system, only the route configuration when any one of the hot water supply operation, the heating operation (floor heating operation), and the bath reheating operation is operated alone. explained. When two or more of hot water supply operation, heating operation (floor heating operation) and bath reheating operation are operated, it is possible to use the generated heat and the heat storage in the hot water tank 20 as heating means in the operation of 1. Limited. The priority order of using the generated heat or the heat storage in the hot water tank 20 as a heating means is the order of the hot water supply operation, the bath reheating operation, and the floor heating operation. For example, when there is a floor heating operation request, if a power generation operation is in progress, a route form that uses generated heat for the floor heating operation is formed. When there is a hot water supply operation request during this floor heating operation, a route configuration for using the generated heat for the hot water supply operation (route configuration 1) and a route configuration for using the burner 57 for the floor heating operation (route configuration 6). Both are formed.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Moreover, the technique illustrated in this specification or the drawings achieves a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

The systematic diagram of the cogeneration system which concerns on 1st Example. The flowchart which shows the determination process of a route form. The subroutine which shows the determination process (process A) of the path | route form at the time of hot water supply driving | operation. The subroutine which shows the determination process (process B) of the path | route form at the time of floor heating operation. The subroutine which shows the determination process (process C) of the path | route form at the time of the chasing operation of a bath. The subroutine which shows the determination process (process D) of the path | route form at the time of heat storage operation or a heating operation. The figure which shows the path | route form 1. FIG. The figure which shows the path | route form 2. FIG. The figure which shows the route form 3. The figure which shows the route form 4. The figure which shows the route form 5. The figure which shows the route form 6. The figure which shows the route form 7. The figure which shows the route form 8. The figure which shows the route form 9. FIG. The figure which shows the route form 10. The figure which shows the route form 11. The systematic diagram of the cogeneration system which concerns on 2nd Example. The figure which shows route form 3p. The figure which shows route form 4p. The figure which shows route form 5p. The figure which shows route form 7p. The figure which shows route form 8p. The figure which shows the path | route form 11p.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Hot water supply system 20: Hot water storage tank 22: Heat source machine 24: Mixing unit 26: 1st shared path 40: Circulation pump 42: 2nd shared path 51: Hot water supply path 52: Bypass path 53: Heat exchanger 56: Systurn return path 57: burner 58: reheating heat exchanger 60: burner heat exchanger 61: cis turn 64: hot water tap 68: cis turn outgoing route 69: heating pump 70: low temperature water route 71: burner upstream route 73: high temperature water route 77: additional Fired path 79: Bath 80: Bath circulation path 82: Bath circulation pump 86: Three-way valve, 86a: A port, 86b: B port, 86c: C port 92: Bypass path 110: Power generation unit 128: Heat recovery path, 128a: Heat recovery outward path, 128b: Heat recovery return path 153: Plate coil type heat exchanger

Claims (7)

It is a cogeneration system that generates electricity according to power demand, stores the generated heat generated with the power generation, and supplies the stored thermal energy when necessary.
A power generation unit for generating power;
A hot water tank for storing hot water,
A mixing unit that mixes hot water and tap water and adjusts the mixing ratio;
A heating terminal,
A first water path for supplying tap water to a hot water tank;
A second water path connecting the hot water tank and the mixing unit;
A third water path for supplying hot mixed water mixed by the mixing unit;
A fourth water path passing through the power generation unit and having one end connected to the first water path and the other end connected to the second water path;
A first circulation means for circulating water in a first circulation path comprising a first water path, a hot water tank, a second water path, and a fourth water path;
A second circulation path through which a heat medium for heating the heating terminal circulates;
A second circulation means for circulating the heat medium in the second circulation path;
A heater for heating the heat medium in the second circulation path;
A first heat exchanger that performs heat exchange between water in the second water path between the connection point of the fourth water path and the hot water storage tank and the heat medium in the second circulation path is provided. Cogeneration system.   2. The cogeneration system according to claim 1, wherein the first circulation unit can switch a circulation direction, and the second circulation unit can also switch a circulation direction.   The second circulation path includes a bypass path that bypasses the first heat exchanger, and the path that passes through the first heat exchanger and the bypass path are switchable. 1 or 2 cogeneration system. It is a cogeneration system that generates electricity according to power demand, stores the generated heat generated with the power generation, and supplies the stored thermal energy when necessary.
A power generation unit for generating power;
A hot water tank for storing hot water,
A mixing unit that mixes hot water and tap water and adjusts the mixing ratio;
A heating terminal,
A first water path for supplying tap water to a hot water tank;
A second water path connecting the hot water tank and the mixing unit;
A third water path for supplying hot mixed water mixed by the mixing unit;
A fourth water path passing through the power generation unit and having one end connected to the first water path and the other end connected to the second water path;
A first circulation means for circulating water in a first circulation path comprising a first water path, a hot water tank, a second water path, and a fourth water path;
A second circulation path through which a heat medium for heating the heating terminal circulates;
A second circulation means for circulating the heat medium in the second circulation path;
A heater for heating the heat medium in the second circulation path;
A second heat exchanger that is attached to the outside of the hot water tank and exchanges heat between the water in the hot water tank and the heat medium in the second circulation path ;
While the power generation operation is stopped, heating the heat medium in the second circulation path by the heater and circulating the heat medium in the second circulation path by the second circulation means to heat the water in the hot water tank. A featured cogeneration system.   The second circulation path includes a bypass path that bypasses the second heat exchanger, and the path that passes through the second heat exchanger and the bypass path are switchable. 4 cogeneration system.   Between the 3rd circulation path through which the water in a bathtub circulates, the 3rd circulation means to circulate the water in the 3rd circulation path, the heat carrier which circulates in the 2nd circulation path, and the warm water in the 3rd circulation path The cogeneration system according to any one of claims 1 to 5, further comprising a third heat exchanger that performs heat exchange at the first and second heat exchangers.   The cogeneration system according to claim 6, wherein the third circulation means is capable of switching the circulation direction in the third circulation path.

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