JP6796428B2 - Heat pump system - Google Patents

Description

The techniques disclosed herein relate to heat pump systems.

Patent Document 1 describes a compressor that pressurizes a refrigerant, a condenser that condenses the refrigerant by exchanging heat with the first fluid to be heated and / or a second fluid to be heated, and a decompression mechanism that depressurizes the refrigerant. A heat pump including an evaporator that evaporates the refrigerant by exchanging heat with the surrounding environment and a heat pump system including a control device are disclosed. This heat pump system can perform a first heating operation in which the first fluid to be heated is heated by the heat pump and a second heating operation in which the second fluid to be heated is heated by the heat pump.

Japanese Unexamined Patent Publication No. 2014-16103

Normally, in the heat pump system as described above, in the first heating operation in which the first fluid to be heated is heated by the heat pump, the target condensation temperature of the refrigerant is set based on the target heating temperature of the first fluid to be heated, and the refrigerant is charged. Operate the heat pump so that the condensation temperature reaches the target condensation temperature. Further, in the heat pump system as described above, in the second heating operation in which the second fluid to be heated is heated by the heat pump, the target condensation temperature of the refrigerant is set based on the target heating temperature of the second fluid to be heated, and the refrigerant is charged. Operate the heat pump so that the condensation temperature reaches the target condensation temperature. As long as the first heating operation and the second heating operation are performed separately, each of the first heated fluid and the second heated fluid can be heated to a required temperature by the above control.

However, when the first heating operation and the second heating operation are performed at the same time, the above control cannot be applied as it is. In many cases, the target heating temperature of the first fluid to be heated in the first heating operation and the target heating temperature of the second fluid to be heated in the second heating operation are different temperatures. Even in such a case, a technique capable of heating each of the first fluid to be heated and the second fluid to be heated to a required temperature is expected.

The present specification provides a technique for solving the above problems. In the present specification, when the first heated fluid and the second heated fluid are heated at the same time in the condenser of the heat pump, each of the first heated fluid and the second heated fluid is heated to a required temperature. Providing possible technology.

The heat pump system disclosed in the present specification includes a compressor that pressurizes a refrigerant, a condenser that condenses the refrigerant by exchanging heat with the first fluid to be heated and / or a second fluid to be heated, and the same. It includes a decompression mechanism for depressurizing the refrigerant, a heat pump including an evaporator that evaporates the refrigerant by exchanging heat with the surrounding environment, and a control device. The condenser includes a three-fluid heat exchanger that exchanges heat between the refrigerant and the first fluid to be heated and exchanges heat between the refrigerant and the second fluid to be heated. The heat pump system sets the target condensation temperature of the refrigerant based on the first target heating temperature , which is the target heating temperature of the first fluid to be heated, and the condensation temperature of the refrigerant becomes the target condensation temperature. The target condensation temperature of the refrigerant is set based on the first heating operation in which the heat pump is operated to heat the first fluid to be heated by the heat pump and the second target heating temperature which is the target heating temperature of the second fluid to be heated. It is possible to set and operate the heat pump so that the condensation temperature of the refrigerant becomes the target condensation temperature, and execute a second heating operation in which the second heated fluid is heated by the heat pump. When the first heating operation and the second heating operation are simultaneously executed, the heat pump system reaches the first target heating temperature when the first target heating temperature is higher than the second target heating temperature. Based on this, the target condensation temperature of the refrigerant is set, the heat pump is operated so that the condensation temperature of the refrigerant becomes the target condensation temperature, and the heat pump brings the first heated fluid to the first target heating temperature. While heating, the second target heating fluid is heated to a temperature higher than the second target heating temperature, and when the second target heating temperature is higher than the first target heating temperature, the second target heating is performed. The target condensation temperature of the refrigerant is set based on the temperature, the heat pump is operated so that the condensation temperature of the refrigerant becomes the target condensation temperature, and the heat pump heats the first fluid to be heated to the first target. While heating to a temperature higher than the temperature, the second heated fluid is heated to the second target heating temperature .

In the above heat pump system, the target condensation temperature of the refrigerant when the first heating operation and the second heating operation are executed at the same time is set based on the higher of the first target heating temperature and the second target heating temperature. .. Therefore, when the second target heating temperature is equal to or higher than the first target heating temperature , the target condensation temperature of the refrigerant is set based on the second target heating temperature . In this case, the second fluid to be heated is heated to the second target heating temperature , and the first fluid to be heated is heated to a temperature equal to or higher than the first target heating temperature . When the first target heating temperature is higher than the second target heating temperature , the target condensation temperature of the refrigerant is set based on the first target heating temperature . In this case, the first fluid to be heated is heated to the first target heating temperature , and the second fluid to be heated is heated to a temperature equal to or higher than the second target heating temperature . By setting the target condensation temperature of the refrigerant as described above, the first fluid to be heated is heated to the first target heating temperature or higher without unnecessarily increasing the condensation temperature of the refrigerant in the heat pump. 2 The fluid to be heated can be heated to a temperature equal to or higher than the second target heating temperature . Both the first fluid to be heated and the second fluid to be heated can be heated to a temperature higher than the required temperature without applying an excessive load to the compressor of the heat pump.

It is a figure which shows typically the structure of the hot water supply heating system 2 which concerns on Example 1. FIG. It is a flowchart explaining the setting process of the target condensation temperature in a heat pump 50 when the hot water supply heating operation and the heating heating operation are executed at the same time in the hot water supply heating system 2 which concerns on Example 1. FIG. It is a figure which shows typically the structure of the hot water supply heating system 2 which concerns on Example 2. FIG. It is a flowchart explaining the setting process of the target condensation temperature in a heat pump 50 when the hot water supply heating operation and the heating heating operation are executed at the same time in the hot water supply heating system 2 which concerns on Example 2. FIG.

The heat pump system disclosed herein detects the temperature of the first temperature sensor flowing into the condenser and / or the temperature of the second heated fluid flowing into the condenser. A second temperature sensor is further provided, and when the first heating operation and the second heating operation are simultaneously executed, the temperature detected by the first temperature sensor is equal to or higher than the first lower limit temperature and / Alternatively, when the temperature detected by the second temperature sensor is equal to or higher than the second lower limit temperature and the first target heating temperature is higher than the second target heating temperature, the temperature is set to the first target heating temperature. Based on this, the target condensation temperature of the refrigerant is set, the heat pump is operated so that the condensation temperature of the refrigerant becomes the target condensation temperature, and the heat pump brings the first heated fluid to the first target heating temperature. While heating, the second target heating fluid is heated to a temperature higher than the second target heating temperature, and when the second target heating temperature is higher than the first target heating temperature, the second target heating is performed. The target condensation temperature of the refrigerant is set based on the temperature, the heat pump is operated so that the condensation temperature of the refrigerant becomes the target condensation temperature, and the heat pump heats the first fluid to be heated to the first target. It can be configured to heat to a temperature higher than the temperature and to heat the second heated fluid to the second target heating temperature .

When the first heating operation and the second heating operation are executed at the same time, the heating capacity of the heat pump covers all of the amount of heat required for heating the first fluid to be heated and the amount of heat required for heating the second fluid to be heated. May not be possible. Even in such a case, if the target condensation temperature of the refrigerant is set based on the higher of the first target heating temperature and the second target heating temperature , an excessive load is applied to the compressor of the heat pump. There is a risk. In the above heat pump system, when the temperature of the first heated fluid flowing into the condenser is equal to or higher than the first lower limit temperature, that is, when the amount of heat required for heating the first heated fluid is not so large, and / or Only when the temperature of the second heated fluid flowing into the condenser is equal to or higher than the second lower limit temperature, that is, when the amount of heat required for heating the second heated fluid is not so large, the first target heating temperature and the second The target condensation temperature of the fluid is set based on the higher of the target heating temperatures . With such a configuration, it is possible to prevent an excessive load from being applied to the compressor of the heat pump.

The heat pump system disclosed herein may be further configured to include a first auxiliary heat source machine for heating the first heated fluid and / or a second auxiliary heat source machine for heating the second heated fluid. it can.

When the first heating operation and the second heating operation are executed at the same time, the heating capacity of the heat pump covers all of the amount of heat required for heating the first fluid to be heated and the amount of heat required for heating the second fluid to be heated. May not be possible. In such a case, it may not be possible to heat the first fluid to be heated and / or the second fluid to be heated to the target heating temperature only by heating with the heat pump. According to the above heat pump system, even in such a case, by using the first auxiliary heat source machine and / or the second auxiliary heat source machine, the first heated fluid and the second heated fluid are targeted respectively. It can be heated to the heating temperature. Both the first fluid to be heated and the second fluid to be heated can be heated to a temperature higher than the required temperature without applying an excessive load to the compressor of the heat pump.

In the heat pump system disclosed in the present specification, the first heated fluid is a heat medium for heating used in a heating device, and the second heated fluid is a heat medium for hot water supply used in a hot water supply device. Can be configured to be.

According to the above heat pump system, both the heating heat medium and the hot water supply heat medium can be heated to a temperature higher than the required temperature without applying an excessive load to the compressor of the heat pump.

(Example 1)
As shown in FIG. 1, the hot water supply / heating system 2 according to the present embodiment, which is one aspect of the heat pump system, includes a tank unit 4, a heat pump (HP) unit 6, a combustion unit 8, and a control device 100. ..

The HP unit 6 includes a heat pump 50 and a hot water supply water circulation pump 22. The heat pump 50 includes a refrigerant circulation path 52 for circulating a refrigerant (for example, an HFC refrigerant such as R410A or a CO ₂ refrigerant such as R744), an air heat exchanger 54, a fan 56, a compressor 62, and a three-fluid heat exchange. It includes a vessel 58, an expansion valve 60, and a condensation temperature sensor 64.

The air heat exchanger 54 exchanges heat between the outside air blown by the fan 56 and the refrigerant in the refrigerant circulation path 52. As will be described later, the air heat exchanger 54 is supplied with a refrigerant in a low-pressure, low-temperature liquid state after passing through the expansion valve 60. The air heat exchanger 54 heats the refrigerant by exchanging heat between the refrigerant and the outside air. The refrigerant vaporizes when heated and becomes a gas state at a relatively high temperature and low pressure. That is, the air heat exchanger 54 functions as an evaporator that evaporates the refrigerant by exchanging heat with the surrounding environment.

The compressor 62 is supplied with the refrigerant after passing through the air heat exchanger 54. That is, the compressor 62 is supplied with a refrigerant in a gaseous state at a relatively high temperature and a low pressure. When the refrigerant is compressed by the compressor 62, the refrigerant is in a high-temperature and high-pressure gaseous state. The compressor 62 sends the compressed high-temperature and high-pressure gaseous refrigerant to the three-fluid heat exchanger 58.

A high-temperature and high-pressure gaseous refrigerant sent from the compressor 62 is supplied to the refrigerant circulation path 52 of the three-fluid heat exchanger 58. The three-fluid heat exchanger 58 can exchange heat between the refrigerant in the refrigerant circulation path 52 and the water in the tank water circulation path 20 (hereinafter, also referred to as hot water supply water) described later. Further, the three-fluid heat exchanger 58 can exchange heat between the refrigerant in the refrigerant circulation path 52 and the water in the second heating / heating path 88 (hereinafter, also referred to as heating water) described later. As a result of heat exchange in the three-fluid heat exchanger 58, the refrigerant is deprived of heat and condenses. As a result, the refrigerant is in a liquid state at a relatively low temperature and a high pressure. That is, the three-fluid heat exchanger 58 functions as a condenser that condenses the refrigerant by exchanging heat between the refrigerant for heating and / or water for hot water supply. A condensation temperature sensor 64 is provided in the refrigerant circulation path 52 of the three-fluid heat exchanger 58. The condensation temperature sensor 64 detects the temperature of the refrigerant flowing through the refrigerant circulation path 52 of the three-fluid heat exchanger 58, that is, the condensation temperature of the refrigerant in the three-fluid heat exchanger 58.

The expansion valve 60 is supplied with a refrigerant in a liquid state at a relatively low temperature and high pressure after passing through the three-fluid heat exchanger 58. The refrigerant is depressurized by passing through the expansion valve 60, and becomes a low-temperature low-pressure liquid state. That is, the expansion valve 60 functions as a pressure reducing mechanism for reducing the pressure of the refrigerant. The refrigerant that has passed through the expansion valve 60 is sent to the air heat exchanger 54 as described above.

When the compressor 62 is operated in the heat pump 50, the refrigerant in the refrigerant circulation path 52 circulates in the order of the air heat exchanger 54, the compressor 62, the three-fluid heat exchanger 58, and the expansion valve 60. The refrigerant circulating in the heat pump 50 absorbs heat from the outside air blown by the fan 56 when passing through the air heat exchanger 54, and is used as hot water for hot water supply in the tank water circulation path 20 when passing through the three-fluid heat exchanger 58. , The heating water in the second heating heating path 88 is heated.

The tank unit 4 includes a tank 10. The tank 10 stores hot water for hot water supply heated by the heat pump 50. The hot water for hot water supply in this embodiment is tap water. The tank 10 is a closed type, and the outside is covered with a heat insulating material. Hot water for hot water supply is stored in the tank 10 until it is full. Thermistors 12, 14, 16 and 18 are attached to the tank 10 at substantially equal intervals in the height direction of the tank 10. Each thermistor 12, 14, 16 and 18 measures the temperature of hot water for hot water supply at the mounting position. The heat storage state of the tank 10 can be specified from the detected temperatures of the thermistors 12, 14, 16 and 18.

The upstream end of the tank water circulation path 20 is connected to the lower part of the tank 10, passes through the three-fluid heat exchanger 58 of the HP unit 6, and the downstream end is connected to the upper part of the tank 10. A water circulation pump 22 for hot water supply of the HP unit 6 is interposed in the tank water circulation path 20. When the heat pump 50 is operated in the HP unit 6 to drive the hot water supply water circulation pump 22, the hot water supply water at the lower part of the tank 10 is sent to the three-fluid heat exchanger 58 to be heated, and the heated hot water supply water is sent to the tank 10 Returned to the top of. Inside the tank 10, a temperature stratification is formed in which a layer of high-temperature hot water is stacked on a layer of low-temperature hot water. A thermistor 21 is attached to the downstream side of the tank water circulation path 20 with respect to the three-fluid heat exchanger 58. The thermistor 21 detects the temperature of the hot water supply water sent from the heat pump 50 to the tank 10.

The upstream end of the tap water introduction path 24 is connected to the tap water supply source 32 outside the hot water supply and heating system 2. The downstream side of the tap water introduction path 24 is branched into a first introduction path 24a and a second introduction path 24b. The downstream end of the first introduction path 24a is connected to the lower part of the tank 10. The downstream end of the second introduction path 24b is connected in the middle of the first hot water supply path 36. A check valve 26 is interposed in the first introduction path 24a. A check valve 28 is interposed in the second introduction path 24b.

The upstream end of the first hot water supply channel 36 is connected to the upper part of the tank 10. As described above, the second introduction passage 24b of the tap water introduction passage 24 is connected in the middle of the first hot water supply passage 36. A mixing valve 30 is interposed at the connection portion between the first hot water supply passage 36 and the second introduction passage 24b. The mixing valve 30 adjusts the ratio of the flow rate of high-temperature hot water flowing into the first hot water supply passage 36 from the upper part of the tank 10 to the flow rate of low-temperature tap water flowing from the second introduction passage 24b into the first hot water supply passage 36. To do. The first hot water supply passage 36 on the downstream side of the connection portion with the second introduction passage 24b passes through the hot water supply heating passage 37 of the combustion unit 8 and is connected to the second hot water supply passage 39. The first hot water supply passage 36 and the second hot water supply passage 39 are connected by a heat source machine bypass passage 33. A bypass valve 34 is interposed in the heat source machine bypass path 33. The downstream end of the second hot water supply passage 39 is connected to the hot water supply tap 38.

The combustion unit 8 includes a systurn 70, a heating burner 82, and a hot water supply burner 81. The systurn 70 is a container whose upper part is open, and stores heating water inside. The heating water of this embodiment is, for example, antifreeze. The upstream end of the heating outbound route 72 is connected to the systurn 70. A water circulation pump 74 for heating is interposed in the heating outbound route 72. When the heating water circulation pump 74 is driven, the heating water in the systurn 70 flows into the heating outbound route 72.

The downstream end of the heating outbound path 72 is branched into a first heating heating path 73 and a low temperature heating circulation path 75. A low-temperature heater 78 is attached to the low-temperature heating circulation path 75. The low temperature heater 78 of this embodiment is, for example, a floor heater. The low temperature heater 78 heats by utilizing the heat of the supplied heating water. A heating burner 82 is interposed in the first heating heating path 73. The heating burner 82 heats the heating water in the first heating heating path 73. The downstream end of the first heating heating path 73 is branched into a high temperature heating circulation path 77 and a reheating circulation path 79. A high temperature heater 76 is attached to the high temperature heating circulation path 77. The high temperature heater 76 of this embodiment is, for example, a bathroom heater / dryer. The high temperature heater 76 heats by utilizing the heat of the supplied heating water. The low-temperature heating circulation path 75 and the high-temperature heating circulation path 77 merge at their respective downstream ends and are connected to the upstream end of the first heating return path 84.

The downstream end of the first heating return path 84 is branched into the second heating heating path 88 and the HP bypass path 94 in the tank unit 4. A heating water regulating valve 90 is provided at the downstream end of the first heating return path 84. By changing the opening degree of the heating water adjusting valve 90, the flow rate of the heating water flowing from the first heating return path 84 to the second heating heating path 88 and the flow rate of the heating water flowing from the first heating return path 84 to the HP bypass path 94 The ratio of the flow rate can be changed. For the heating water regulating valve 90 of this embodiment, for example, a three-way valve is used. The second heating heating path 88 passes through the three-fluid heat exchanger 58 of the HP unit 6 and is connected to the upstream end of the second heating return path 96. The HP bypass path 94 is connected to the upstream end of the second heating return path 96 without passing through the three-fluid heat exchanger 58 of the HP unit 6. The downstream end of the second heating return path 96 is connected to the system turn 70 of the combustion unit 8.

A reheating heat valve 83 and a reheating heat exchanger 97 are interposed in the reheating circulation path 79. The reheating thermal valve 83 opens and closes the reheating circulation path 79. In the reheating heat exchanger 97, heat is exchanged between the heating water flowing through the reheating circulation path 79 and the bathtub water flowing through the bathtub water circulation path 91. The downstream end of the reheating circulation path 79 is connected to the second heating return path 96.

The upstream end of the bathtub water circulation path 91 is connected to the bottom of the bathtub 98. The downstream end of the bathtub water circulation path 91 is connected to the side portion of the bathtub 98. A bathtub water circulation pump 99 is interposed in the bathtub water circulation path 91. When the bathtub water circulation pump 99 is driven, the bathtub water sucked from the bottom of the bathtub 98 passes through the reheating heat exchanger 97 and is returned to the side portion of the bathtub 98.

A hot water supply burner 81 is interposed in the hot water supply heating path 37. The bathtub pouring passage 40 branches from the downstream side of the hot water supply burning burner 81 of the hot water supply heating passage 37. The bathtub pouring passage 40 is provided with a hot water pouring solenoid valve 42 that opens and closes the bathtub pouring passage 40. The downstream end of the bathtub pouring passage 40 is connected to the bathtub water circulation pump 99.

The control device 100 controls the operation of each component of the tank unit 4, the HP unit 6, and the combustion unit 8. The control device 100 includes a setting means for the user to set a hot water supply set temperature, a hot water beam set temperature, a hot water beam set water amount, a low temperature heating set temperature, a high temperature heating set temperature, etc., which will be described later, a time measuring means for acquiring the current time, and the like. It is equipped with a storage means for storing past driving results.

(Operation of hot water supply and heating system)
Next, the operation of the hot water supply / heating system 2 of this embodiment will be described. Hereinafter, the hot water supply heating operation, the hot water supply operation, the heating / heating operation, the hot water filling operation, and the reheating operation carried out by the hot water supply / heating system 2 will be described in order.

(Hot water supply heating operation)
The hot water supply heating operation is an operation in which the hot water supply water in the tank 10 is heated by the heat pump 50 and the high temperature hot water supply water is returned to the tank 10. When executing the hot water supply heating operation, the control device 100 drives the compressor 62 and the fan 56 to operate the heat pump 50, and also drives the hot water supply water circulation pump 22.

By driving the compressor 62, the refrigerant in the refrigerant circulation path 52 circulates in the order of the air heat exchanger 54, the compressor 62, the three-fluid heat exchanger 58, and the expansion valve 60. In this case, the refrigerant in the refrigerant circulation path 52 passing through the three-fluid heat exchanger 58 is in a high-temperature and high-pressure gas state. Further, by driving the hot water supply water circulation pump 22, the hot water supply water in the tank 10 circulates in the tank water circulation path 20. That is, the hot water supply water existing in the lower part of the tank 10 is introduced into the tank water circulation path 20, and when the introduced hot water supply water passes through the three-fluid heat exchanger 58, it is heated by the heat of the refrigerant in the refrigerant circulation path 52. Then, the heated hot water for hot water supply is returned to the upper part of the tank 10. In the control device 100, the hot water supply heating temperature is preset as the target temperature of the hot water supply water after heating by the HP unit 6 in the hot water supply heating operation. The hot water supply heating temperature is set based on, for example, the hot water supply set temperature and the hot water beam set temperature. The hot water supply heating temperature is set to, for example, a temperature obtained by adding a predetermined temperature (for example, 5 ° C.) to the hot water supply set temperature or the hot water beam set temperature. In this embodiment, in the hot water supply heating operation, the control device 100 sets the target condensation temperature of the refrigerant in the heat pump 50 to a temperature obtained by adding a predetermined temperature (for example, 1 ° C.) to the hot water supply heating temperature. In the control device 100, the rotation speed of the compressor 62 of the heat pump 50, the opening degree of the expansion valve 60, and the rotation speed of the fan 56 so that the condensation temperature of the refrigerant detected by the condensation temperature sensor 64 matches the target condensation temperature. To control. Further, the control device 100 controls the rotation speed of the hot water supply water circulation pump 22 so that the temperature of the hot water supply water detected by the thermistor 21 matches the hot water supply heating temperature. By executing the hot water supply heating operation, high temperature hot water supply water is stored in the tank 10. When the inside of the tank 10 is filled with hot water for hot water supply and becomes full, the hot water supply heating operation ends.

(Hot water supply operation)
The hot water supply operation is an operation of supplying the hot water supply water in the tank 10 to the hot water supply plug 38. The hot water supply operation can also be performed in parallel with the hot water supply heating operation described above. When the hot water tap 38 is opened, tap water flows into the lower part of the tank 10 from the tap water introduction path 24 (first introduction path 24a) due to the water pressure from the tap water supply source 32. At the same time, the hot water supply water in the upper part of the tank 10 is supplied to the hot water supply tap 38 via the first hot water supply passage 36.

When the temperature of the hot water supply water supplied from the tank 10 to the first hot water supply passage 36 is higher than the hot water supply set temperature, the control device 100 drives the mixing valve 30 to drive the second introduction passage 24b to the first hot water supply passage 36. Introduce tap water to. Therefore, the hot water supply water supplied from the tank 10 and the tap water supplied from the second introduction passage 24b are mixed in the first hot water supply passage 36. The control device 100 adjusts the opening degree of the mixing valve 30 so that the temperature of the hot water supply water supplied to the hot water supply plug 38 matches the hot water supply set temperature. On the other hand, when the temperature of the hot water supply water supplied from the tank 10 to the first hot water supply passage 36 is lower than the hot water supply set temperature, the control device 100 heats the water passing through the first hot water supply passage 36 by the hot water supply burner 81. To do. The control device 100 controls the output of the hot water supply burner 81 so that the temperature of the hot water supply water supplied to the hot water supply plug 38 matches the hot water supply set temperature.

(Heating and heating operation)
The heating heating operation is an operation in which the heating water is heated by the heat pump 50 and heated by the low temperature heater 78 and the high temperature heater 76 using the high temperature heating water. When the user instructs the execution of the heating / heating operation, the control device 100 adjusts the opening degree of the heating water adjusting valve 90 according to the load of the low temperature heater 78 and the high temperature heater 76, and the heating water circulation pump 74. To rotate. Further, the control device 100 drives the compressor 62 and the fan 56 to operate the heat pump 50. As a result, the heating water heated by the three-fluid heat exchanger 58 is supplied to the low-temperature heater 78 and the high-temperature heater 76 via the systurn 70. Further, the control device 100 operates the heating burner 82 as needed. As a result, the high-temperature heater 76 is supplied with heating water that has become even hotter due to heating by the heating burner 82. In the control device 100, the heating heating temperature is preset as the target temperature of the heating water after heating by the HP unit 6 in the heating heating operation. The heating heating temperature is set based on, for example, the low temperature heating set temperature of the low temperature heater 78 and the high temperature heating set temperature of the high temperature heater 76. The heating heating temperature is set to, for example, a temperature obtained by adding a predetermined temperature (for example, 5 ° C.) to the low temperature heating set temperature in the low temperature heater 78. In this embodiment, in the heating and heating operation, the control device 100 sets the target condensation temperature of the refrigerant in the heat pump 50 to a temperature obtained by adding a predetermined temperature (for example, 1 ° C.) to the heating and heating temperature. In the control device 100, the rotation speed of the compressor 62 of the heat pump 50, the opening degree of the expansion valve 60, and the rotation speed of the fan 56 so that the condensation temperature of the refrigerant detected by the condensation temperature sensor 64 matches the target condensation temperature. To control. Further, in the control device 100, the temperature of the heating water supplied to the low temperature heater 78 becomes the low temperature heating set temperature, and the temperature of the heating water supplied to the high temperature heater 76 becomes the high temperature heating set temperature. In addition, the rotation speed of the heating water circulation pump 74, the opening degree of the heating water adjusting valve 90, and the output of the heating burner 82 are controlled.

(Hot water operation)
The hot water filling operation is an operation of hot water filling the bathtub 98. When the user instructs the start of the hot water supply operation, the hot water supply / heating system 2 starts the hot water supply operation. In the hot water filling operation, the control device 100 opens the hot water pouring solenoid valve 42. When the hot water pouring solenoid valve 42 is opened, tap water flows into the lower part of the tank 10 from the tap water introduction path 24 (first introduction path 24a) due to the water pressure from the tap water supply source 32. At the same time, hot water for hot water supply in the upper part of the tank 10 is supplied to the bathtub 98 via the first hot water supply passage 36, the hot water supply heating passage 37, the bathtub pouring passage 40, and the bathtub water circulation passage 91. In the hot water filling operation, the control device 100 adjusts the temperature of the water supplied to the bathtub pouring passage 40 to the hot water filling setting temperature in the same manner as in the hot water supply operation. When the amount of water supplied to the bathtub 98 reaches the set amount of hot water, the hot water operation ends.

(Reheating operation)
The reheating operation is an operation of reheating the bathtub water stored in the bathtub 98. When the user instructs the start of the reheating operation, the hot water supply / heating system 2 starts the reheating operation. In the reheating operation, the control device 100 drives the bathtub water circulation pump 99. Further, the control device 100 opens the reheating thermal valve 83 to drive the heating water circulation pump 74. As a result, the bathtub water is sucked out from the bottom of the bathtub 98, and is heated by the reheating heat exchanger 97 by heat exchange with the heating water. The heated bath water is returned to the side of the bath 98. In the reheating operation, the heating water is heated by the heat pump 50 and the heating water is heated by the heating burner 82 in the same manner as in the heating heating operation. The reheating operation can be said to be an aspect of the heating / heating operation.

(Simultaneous execution of hot water supply heating operation and heating heating operation)
When the hot water supply heating operation and the heating / heating operation are simultaneously executed in the hot water supply / heating system 2, the heat pump 50 simultaneously heats the hot water supply water and the heating water. In such a case, the control device 100 sets the target condensation temperature of the refrigerant in the heat pump 50 by the process shown in FIG.

In step S2, the control device 100 determines whether or not the hot water supply heating temperature is equal to or higher than the heating heating temperature. When the hot water supply heating temperature is equal to or higher than the heating heating temperature (YES), the process proceeds to step S4. If the hot water supply heating temperature is less than the heating heating temperature (NO), the process proceeds to step S6.

In step S4, the control device 100 sets the target condensation temperature of the refrigerant to a value obtained by adding a predetermined temperature (for example, 1 ° C.) to the hot water supply heating temperature.

In step S6, the control device 100 sets the target condensation temperature of the refrigerant to a value obtained by adding a predetermined temperature (for example, 1 ° C.) to the heating heating temperature.

As described above, in the hot water supply heating system 2 of the present embodiment, when the hot water supply heating temperature is equal to or higher than the heating heating temperature, the target condensation temperature of the refrigerant in the heat pump 50 is set based on the hot water supply heating temperature. In this case, the heat pump 50 can heat the hot water supply water to the hot water supply heating temperature, and can also heat the heating water to a temperature higher than the heating heating temperature. On the other hand, when the hot water supply heating temperature is less than the heating heating temperature, the target condensation temperature of the refrigerant in the heat pump 50 is set based on the heating heating temperature. In this case, the heat pump 50 can heat the hot water supply water to a temperature higher than the hot water supply heating temperature, and can also heat the heating water to the heating heating temperature. By setting the target condensation temperature of the refrigerant as described above, the hot water for hot water supply is heated to the hot water supply heating temperature or higher and the heating water is heated without raising the condensation temperature of the refrigerant in the heat pump 50 more than necessary. It can be heated above the temperature. Both the hot water supply water and the heating water can be heated to a temperature higher than the required temperature without applying an excessive load to the compressor 62 of the heat pump 50.

(Example 2)
As shown in FIG. 3, the hot water supply / heating system 102 according to the present embodiment has substantially the same configuration as the hot water supply / heating system 2 of the first embodiment. Hereinafter, the difference between the hot water supply and heating system 102 of the present embodiment and the hot water supply and heating system 2 of the first embodiment will be described.

In the hot water supply heating system 102 of this embodiment, the HP unit 6 has a hot water supply inflow temperature sensor 104 that detects the temperature of the hot water supply water flowing into the three-fluid heat exchanger 58 (hereinafter, also referred to as a hot water supply inflow temperature), and the three-fluid heat. A heating inflow temperature sensor 106 for detecting the temperature of the heating water flowing into the exchanger 58 (hereinafter, also referred to as a heating inflow temperature) is provided.

The hot water supply and heating system 102 of this embodiment can carry out hot water supply heating operation, hot water supply operation, heating and heating operation, hot water filling operation, and reheating operation in the same manner as the hot water supply and heating system 2 of Example 1.

When the hot water supply heating operation and the heating heating operation are simultaneously executed in the hot water supply and heating system 102, the heat pump 50 heats the hot water supply water and the heating water at the same time. In such a case, the control device 100 sets the target condensation temperature of the refrigerant in the heat pump 50 by the process shown in FIG.

In step S12, the control device 100 determines whether or not the hot water supply inflow temperature detected by the hot water supply inflow temperature sensor 104 is equal to or higher than a predetermined first lower limit temperature (for example, 5 ° C.). When the hot water supply inflow temperature is equal to or higher than the first lower limit temperature (YES), the process proceeds to step S14.

In step S14, the control device 100 determines whether or not the heating inflow temperature detected by the heating inflow temperature sensor 106 is equal to or higher than a predetermined second lower limit temperature (for example, 30 ° C.). When the heating inflow temperature is equal to or higher than the second lower limit temperature (YES), the process proceeds to step S22.

The processing of steps S22, S24 and S26 is the same as the processing of steps S2, S4 and S6 of the processing in the hot water supply / heating system 2 of the first embodiment shown in FIG.

In step S12 of FIG. 4, when the hot water supply inflow temperature is less than the first lower limit temperature (NO), or in step S14, the heating inflow temperature is less than the second lower limit temperature (NO), processing is performed. Proceeds to step S16. In step S16, the control device 100 sets the target condensation temperature of the refrigerant to a value obtained by adding a predetermined temperature (for example, 1 ° C.) to the hot water supply heating temperature.

When the hot water supply heating operation and the heating heating operation are executed at the same time, it may not be possible for the heating capacity of the heat pump 50 to cover all of the amount of heat required for heating the hot water supply water and the amount of heat required for heating the heating water. Even in such a case, if the target condensation temperature of the refrigerant is set based on the higher of the hot water supply heating temperature and the heating heating temperature as in the hot water supply and heating system 2 of the first embodiment, the compressor 62 becomes excessive. There is a risk of applying a heavy load.

Therefore, in the hot water supply heating system 102 of the present embodiment, when the inflow temperature of the hot water supply water is lower than the first lower limit temperature (NO in step S12), the amount of heat required for heating the hot water supply water is larger than usual. Judging, the target condensation temperature of the refrigerant is set based on the hot water supply heating temperature as in the case where the hot water supply heating operation is performed independently. Further, in the hot water supply and heating system 102 of the present embodiment, when the inflow temperature of the heating water is lower than the second lower limit temperature (NO in step S14), the amount of heat required for heating the heating water is larger than usual. Judging, the target condensation temperature of the refrigerant is set based on the hot water supply heating temperature in the same manner as described above. In either case, the target condensation temperature of the refrigerant is set based on the hot water supply heating temperature regardless of the magnitude relationship between the heating heating temperature and the hot water supply heating temperature, so it may not be possible to heat the heating water to the heating heating temperature. Can occur. However, since the hot water supply and heating system 102 of the present embodiment includes the heating burner 82, the heating of the heating water by the heating burner 82 heats the temperature required by the low temperature heater 78 and the high temperature heater 76. Water can be supplied. With the above configuration, it is possible to prevent an excessive load from being applied to the compressor 62 of the heat pump 50.

In the process of FIG. 4, the control device 100 may omit step S12 and execute only step S14, or may omit step S14 and execute only step S12. Alternatively, instead of performing the processes of steps S12 and S14, the temperature detected by the hot water supply inflow temperature sensor 104 by the control device 100 is less than the first lower limit temperature, and the temperature detected by the heating inflow temperature sensor 106 is The process of step S16 may be performed only when the temperature is less than the second lower limit temperature, and the processes of steps S22, S24 and S26 may be performed in other cases.

In step S16 of the process of FIG. 4, instead of setting the target condensation temperature of the refrigerant based on the hot water supply heating temperature, the target condensation temperature of the refrigerant may be set based on the heating heating temperature. In this case, since the target condensation temperature of the refrigerant is set based on the heating heating temperature regardless of the magnitude relationship between the heating heating temperature and the hot water heating temperature, it may not be possible to heat the hot water for hot water to the hot water heating temperature. .. However, since the hot water supply heating system 102 of the present embodiment includes the hot water supply burner 81, the hot water supply water at the temperature required by the hot water supply plug 38 and the bathtub 98 is supplied by heating the hot water supply water by the hot water supply burner 81. can do. Even with the above configuration, it is possible to prevent an excessive load from being applied to the compressor 62 of the heat pump 50.

In the above embodiment, a configuration in which the hot water supply water stored in the tank 10 is directly supplied to the hot water supply plug 38 and the bathtub 98, that is, a configuration in which tap water such as tap water is used as the hot water supply water has been described. Unlike this, the hot water supply water stored in the tank 10 is composed of an antifreeze liquid as a heating fluid, the tap water is heated by heat exchange between the antifreeze liquid stored in the tank 10 and tap water, and the hot tap water is supplied. It may be configured to supply to the stopper 38 or the water heater 98. In this case, the antifreeze liquid is a heating fluid in relation to tap water, but is a heated fluid in relation to the refrigerant of the heat pump 50.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above. In addition, the technical elements described in the present 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. In addition, the techniques illustrated in the present specification or drawings achieve a plurality of objectives at the same time, and achieving one of the objectives itself has technical usefulness.

2: Hot water supply and heating system 4: Tank unit 6: HP unit 8: Combustion unit 10: Tank 12: Thermista 14: Thermista 16: Thermista 18: Thermista 20: Tank water circulation path 21: Thermista 22: Hot water circulation pump 24: Tap water Introduction path 24a: First introduction path 24b: Second introduction path 26: Check valve 28: Check valve 30: Mixing valve 32: Tap water supply source 33: Heat source machine Bypass path 34: Bypass valve 36: First hot water supply path 37: Hot water supply heating path 38: Hot water tap 39: Second hot water supply path 40: Bath water pouring path 42: Hot water pouring electromagnetic valve 50: Heat pump 52: Coolant circulation path 54: Air heat exchanger 56: Fan 58: Three-fluid heat exchange Vessel 60: Expansion valve 62: Compressor 64: Condensation temperature sensor 70: Systurn 72: Heating outbound route 73: First heating heating path 74: Heating water circulation pump 75: Low temperature heating circulation path 76: High temperature heater 77: High temperature heating circulation Road 78: Low temperature heater 79: Reheating circulation path 81: Hot water supply burner 82: Heating burner 83: Reheating heat valve 84: First heating return path 88: Second heating heating path 90: Heating water adjusting valve 91: Bath water circulation path 94: HP bypass path 96: Second heating return path 97: Reheating heat exchanger 98: Bathtub 99: Bath water circulation pump 100: Control device 102: Hot water supply heating system 104: Hot water supply inflow temperature sensor 106: Heating inflow temperature sensor

Claims (4)

A compressor that pressurizes the refrigerant, a condenser that condenses the refrigerant by exchanging heat with the first fluid to be heated and / or a second fluid to be heated, a decompression mechanism that depressurizes the refrigerant, and the refrigerant. A heat pump equipped with an evaporator that evaporates the refrigerant by exchanging heat with the surrounding environment.
Equipped with a control device
The condenser includes a three-fluid heat exchanger that exchanges heat between the refrigerant and the first fluid to be heated and exchanges heat between the refrigerant and the second fluid to be heated.
The target condensation temperature of the refrigerant is set based on the first target heating temperature , which is the target heating temperature of the first fluid to be heated, and the heat pump is operated so that the condensation temperature of the refrigerant becomes the target condensation temperature. The target condensation temperature of the refrigerant is set based on the first heating operation in which the first fluid to be heated is heated by the heat pump and the second target heating temperature which is the target heating temperature of the second fluid to be heated, and the refrigerant is described. It is possible to perform a second heating operation in which the heat pump is operated so that the condensation temperature of the water reaches the target condensation temperature, and the second heated fluid is heated by the heat pump.
When the first heating operation and the second heating operation are executed at the same time,
When the first target heating temperature is higher than the second target heating temperature, the target condensation temperature of the refrigerant is set based on the first target heating temperature, and the condensation temperature of the refrigerant becomes the target condensation temperature. The heat pump is operated so as to be such that the first heated fluid is heated to the first target heating temperature, and the second heated fluid is heated to a temperature higher than the second target heating temperature. And
When the second target heating temperature is higher than the first target heating temperature, the target condensation temperature of the refrigerant is set based on the second target heating temperature, and the condensation temperature of the refrigerant becomes the target condensation temperature. The heat pump is operated so as to be such that the first heated fluid is heated to a temperature higher than the first target heating temperature, and the second heated fluid is heated to the second target heating temperature. to, heat pump system. It further includes a first temperature sensor that detects the temperature of the first heated fluid flowing into the condenser and / or a second temperature sensor that detects the temperature of the second heated fluid flowing into the condenser. ,
When the first heating operation and the second heating operation are executed at the same time, the temperature detected by the first temperature sensor is equal to or higher than the first lower limit temperature and / or is detected by the second temperature sensor. When the temperature is above the second lower limit temperature
When the first target heating temperature is higher than the second target heating temperature, the target condensation temperature of the refrigerant is set based on the first target heating temperature, and the condensation temperature of the refrigerant becomes the target condensation temperature. The heat pump is operated so as to be such that the first heated fluid is heated to the first target heating temperature, and the second heated fluid is heated to a temperature higher than the second target heating temperature. And
When the second target heating temperature is higher than the first target heating temperature, the target condensation temperature of the refrigerant is set based on the second target heating temperature, and the condensation temperature of the refrigerant becomes the target condensation temperature. The heat pump is operated so as to be such that the first heated fluid is heated to a temperature higher than the first target heating temperature, and the second heated fluid is heated to the second target heating temperature. to, of claim 1 the heat pump system. The heat pump system according to claim 1 or 2, further comprising a first auxiliary heat source machine for heating the first fluid to be heated and / or a second auxiliary heat source machine for heating the second fluid to be heated. The first fluid to be heated is a heating heat medium used in a heating device.
The heat pump system according to any one of claims 1 to 3, wherein the second fluid to be heated is a heat medium for hot water supply used in a hot water supply device.

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