JP4561920B2 - Heating and hot water supply equipment - Google Patents

Description

  The present invention relates to a heating and hot water supply apparatus used for heating and hot water supply.

  Conventionally, as a heating and hot water supply apparatus, there is one disclosed in Japanese Patent Application Laid-Open No. 2004-232914 (Patent Document 1). The heating hot water supply apparatus includes a heat pump, a hot water storage tank for storing hot water heated by the heat pump, a heat exchanger disposed only in an upper region in the hot water storage tank, and a heater connected to the heat exchanger. It has.

  The hot water storage tank is connected to a faucet through a hot water discharge pipe. By opening this faucet, the hot water stored in the hot water storage tank can be taken out from the faucet.

  The heater performs a heating operation using hot water stored in a hot water storage tank. More specifically, when the heating operation is started, the heat medium in the heat exchanger is heated by the hot water in the hot water storage tank. The heated heat medium is sent to the heater and releases heat from the heater into the room.

  However, since the conventional heating and hot water supply apparatus performs the heating operation as an additional function of the water heater using midnight power, the heat to be released indoors during the heating operation from the hot water in the hot water storage tank through the heat exchanger. The efficiency of taking out the heat is getting worse. That is, the heat of the hot water in the hot water storage tank cannot be efficiently supplied to the heater.

Therefore, the above-mentioned conventional heating and hot water supply apparatus cannot perform sufficient heating in a high heating load area such as Northern Europe where the heating operation is performed for 24 hours in winter and the heating load: hot water supply load is 10: 1, for example. There is a problem.
JP 2004-232914 A

  Then, the subject of this invention is providing the heating hot-water supply apparatus which can perform sufficient heating also in areas with high heating load, such as Northern Europe.

In order to solve the above problems, the heating and hot water supply apparatus of the present invention includes:
A heat pump unit;
A hot water storage tank for storing hot water heated by the heat pump unit;
A heat exchanger disposed in the hot water storage tank, in which hot water flows inside,
A circulating circuit for circulating the hot water stored in the hot water storage tank through the heating terminal outside the hot water storage tank and then circulating it back into the hot water storage tank;
A temperature sensor for detecting the temperature of the hot water flowing through the circulation circuit;
By adjusting at least one of the temperature and flow rate of the hot water supplied to the heating terminal, at least one of the temperature of the return hot water coming out of the heating terminal and the temperature of the incoming hot water entering the heating terminal is adjusted to a predetermined temperature. A temperature control unit,
An outside temperature sensor for detecting the outside temperature;
An output indicating the temperature of hot water flowing through the circulation circuit is received from the temperature sensor, and an output indicating the outside air temperature is received from the outside air temperature sensor, and an output of the temperature sensor and an output of the outside air temperature sensor are And a control unit for controlling the temperature adjusting unit,
The temperature sensor is, only contains and return hot water sensor for detecting the temperature of the return hot water exiting from the heating terminal, and the heated hot water sensor for detecting the temperature of the heated hot water entering the heating terminal,
During the heating operation of the heat pump unit, the control unit determines that, based on a signal from the outside air temperature sensor, the outside air temperature detected by the outside air temperature sensor is equal to or less than a predetermined reference value and the heating load is relatively large. If it judges, while performing preferentially the 1st control which makes the heating capability of the heating terminal high, based on the signal from the outside temperature sensor, the outside temperature detected by the outside temperature sensor is higher than a predetermined reference value. If it is determined that the heating load is relatively small, the second control for improving the coefficient of performance of the heat pump unit is performed preferentially,
In the first control, the control unit controls the temperature so that the temperature of the return warm water coming out of the heating terminal becomes a predetermined return warm water temperature based on the outside air temperature based on the output of the return warm water sensor. Control the adjuster,
In the second control, the control unit controls the temperature so that the temperature of the incoming hot water entering the heating terminal becomes a predetermined outgoing hot water temperature based on the outside air temperature based on the output of the outgoing hot water sensor. It is characterized by controlling the adjusting unit .

  According to the heating and hot water supply apparatus having the above configuration, when the heating operation is started, the hot water stored in the hot water storage tank flows to the heating terminal via the circulation path and returns to the hot water storage tank again. Thereby, the heat of the warm water is released into the room through the heating terminal. That is, the heating terminal directly takes out the heat of the hot water in the hot water storage tank and releases it into the room.

  Therefore, since the heat of the hot water in the hot water storage tank can be efficiently supplied to the heating terminal, sufficient heating can be performed even in an area with a high heating load such as Northern Europe.

  Conventionally, heat is taken out via the heat exchanger in the hot water storage tank and supplied to the heating terminal, so that the efficiency is poor and sufficient heating cannot be performed.

  The temperature adjustment unit adjusts the temperature of the return hot water from the heating terminal or the temperature of the incoming hot water entering the heating terminal to a predetermined temperature by adjusting at least one of the temperature and flow rate of the hot water supplied to the heating terminal. To do. At this time, the said control part controls a temperature control part based on the output of the temperature sensor which detects the temperature of the warm water which flows through a circulation circuit.

  Therefore, the adjustment accuracy of the temperature of the incoming hot water entering the heating terminal is high, and the heating terminal can exhibit desired heating performance.

  Further, when the temperature adjusting unit adjusts at least one of the temperature and the flow rate of the hot water supplied to the heating terminal to adjust the temperature of the hot water from the heating terminal so as not to be excessively high, Returning to the hot water tank, the temperature of the hot water in the hot water tank drops.

  Therefore, since the low temperature warm water in the hot water storage tank can be sent to the heat pump unit, the COP (coefficient of performance) of the heat pump unit can be increased.

  When the temperature adjusting unit adjusts the temperature of the hot water supplied from the heating terminal to a desired high temperature required for heating by adjusting at least one of the temperature and flow rate of the hot water supplied to the heating terminal, The hot water in the hot water storage tank becomes hot, so

Therefore, the hot water in the hot water storage tank flows through the circulation circuit and enters the heating terminal, so that the heating capacity can be increased.
Further, during the heating operation of the heat pump unit, the control unit determines that the outside air temperature detected by the outside air temperature sensor is equal to or less than a predetermined reference value and the heating load is relatively large based on a signal from the outside air temperature sensor. Then, the first control for increasing the heating capacity of the heating terminal is preferentially performed. In this first control, the control unit controls the temperature adjustment unit based on the output of the return hot water sensor so that the temperature of the return hot water coming out of the heating terminal becomes a predetermined return hot water temperature based on the outside air temperature. To do. Thereby, the temperature of the return warm water which comes out of the said heating terminal can be made high, and the temperature of the warm water which enters into a heating terminal can be raised.
Therefore, if the outside air temperature is excessively low, the heating performance of the heating terminal can be increased and the room can be prevented from being cooled.
Further, during the heating operation of the heat pump unit, the control unit determines that the outside air temperature detected by the outside air temperature sensor is higher than a predetermined reference value and the heating load is relatively small based on a signal from the outside air temperature sensor. Then, the second control for improving the coefficient of performance of the heat pump unit is preferentially performed. In the second control, the control unit controls the temperature adjusting unit so that the temperature of the incoming hot water entering the heating terminal becomes a predetermined outgoing hot water temperature based on the outside air temperature based on the output of the outgoing hot water sensor. To do. Thereby, the temperature of the incoming hot water entering the heating terminal can be lowered, and the temperature of the return hot water coming out of the heating terminal can be lowered as much as possible.
Therefore, if the outside air temperature is not excessively low, the heating performance of the heating terminal can be suppressed to prevent wasteful consumption of energy, and hot water having a temperature as low as possible can be supplied to the heat pump unit. Thus, the COP of the heat pump unit can be improved.

In the heating and hot water supply apparatus of one embodiment,
The temperature adjusting unit adjusts the temperature of the return hot water coming out of the heating terminal and the temperature of the outgoing hot water entering the heating terminal by adjusting at least one of the temperature and flow rate of the hot water supplied to the heating terminal. .

  According to the heating hot water supply apparatus of the above embodiment, the temperature adjusting unit adjusts the temperature of the return hot water coming out of the heating terminal and the temperature of the outgoing hot water entering the heating terminal, so that the operation according to the heating load is ensured. It can be carried out.

In the heating and hot water supply apparatus of one embodiment,
A first intake port for taking out hot water stored in the hot water storage tank is provided at the upper part of the hot water storage tank, while returning hot water from the heating terminal to the hot water storage tank at the lower part of the hot water storage tank. There is a return opening,
The circulation circuit is connected to the first intake port and the return port.

  According to the heating and hot water supply apparatus of the above embodiment, since the first intake port is provided in the upper part of the hot water storage tank, relatively hot hot water in the upper region in the hot water storage tank is taken out and sent to the heating terminal. Can do. Therefore, heating can be performed with the relatively hot water.

  Moreover, since the said return port is provided in the lower part of the hot water storage tank, the hot water which became comparatively low temperature by the heating terminal can be returned to the lower area | region in a hot water storage tank. Therefore, it is possible to prevent the relatively hot water in the upper region in the hot water storage tank from being mixed with the warm water that has become relatively cold at the heating terminal.

In the heating and hot water supply apparatus of one embodiment,
A supply port for supplying hot water stored in the hot water storage tank to the heat pump unit is provided at a lower portion of the hot water storage tank.

According to the heating and hot water supply apparatus of the above embodiment, the return port for returning the hot water discharged from the heating terminal to the hot water storage tank is located below the hot water storage tank of the hot water storage tank, and the hot water stored in the hot water storage tank is heat pumped Coupled with the fact that the supply port for supplying to the unit is at the bottom of the hot water storage tank, the heat pump unit is always supplied with relatively low temperature hot water, so the COP (coefficient of performance) of the heat pump unit is improved. . In particular, when the refrigerant of the heat pump unit is a CO ₂ refrigerant, COP is improved.

In the heating and hot water supply apparatus of one embodiment,
A heater is disposed at a substantially central portion in the vertical direction in the hot water storage tank.

  According to the heating and hot water supply apparatus of the above embodiment, since the heater is disposed in the hot water storage tank, the temperature of the hot water in the hot water storage tank can be maintained or raised by the heater when the heat pump unit fails. .

  Further, when the amount of heat given to the hot water by the heat pump unit is insufficient, there is a heater in the hot water storage tank, so the heater can supply the shortage of heat to the hot water.

  Moreover, since the said heater is arrange | positioned in the approximate center part of the up-down direction in a hot water storage tank, it mainly heats the warm water of the upper area | region in a hot water storage tank above a heater. At this time, since the hot water in the upper region in the hot water storage tank is originally higher in temperature than the hot water in the lower region in the hot water storage tank, it becomes higher in a short time by heating the heater.

  Therefore, even if the heating load increases momentarily, the hot water having a higher temperature in the upper region in the hot water storage tank can be immediately sent to the heating terminal.

In the heating and hot water supply apparatus of one embodiment,
A second water intake for taking out hot water stored in the hot water storage tank is provided at a substantially central portion in the vertical direction of the hot water storage tank so as to be positioned near and above the heater,
The circulation circuit is connected to the second water intake.

  According to the heating and hot water supply apparatus of the above embodiment, when the heating load momentarily increases during the heating operation, the hot water in the hot water storage tank is heated to a high temperature by the heater, and this hot water is taken out from the second intake port of the circulation circuit. Send to heating terminal. At this time, the second water intake port is provided at a substantially central portion in the vertical direction of the hot water storage tank and is positioned near and above the heater, so that the hot water immediately after being heated by the heater is taken out and sent to the heating terminal. Can do.

  Therefore, even if the heating load increases momentarily, it is possible to quickly and reliably cope with the instantaneous increase in heating load.

In the heating and hot water supply apparatus of one embodiment,
The heat exchanger is disposed from the lower region to the upper region in the hot water storage tank, and hot water enters the lower portion of the hot water storage tank and exits from the upper portion of the hot water storage tank.

  According to the heating and hot water supply apparatus of the above embodiment, the heat exchanger is arranged from the lower region to the upper region in the hot water storage tank, and hot water enters the lower part of the hot water storage tank and exits from the upper part of the hot water storage tank. The hot water is sufficiently heated by the hot water in the hot water storage tank while flowing through the heat exchanger. Therefore, hot hot water can be discharged from the heat exchanger.

In the heating and hot water supply apparatus of one embodiment,
The temperature adjustment unit includes a circulation pump provided in the circulation circuit between the hot water storage tank and the heating terminal and capable of adjusting a rotation speed.

  According to the heating and hot water supply apparatus of the above embodiment, the circulation pump is provided in a circulation circuit between the hot water storage tank and the heating terminal, and the rotation speed can be adjusted. Can be adjusted reliably.

In the heating and hot water supply apparatus of one embodiment,
The temperature adjusting unit includes a mixing valve that mixes hot water that leaves the hot water storage tank and travels toward the heating terminal and hot water that has exited from the heating terminal and supplies the hot water to the heating terminal.

  According to the heating and hot water supply apparatus of the above embodiment, the mixing valve mixes hot water that goes out of the hot water storage tank and goes to the heating terminal and hot water that comes out of the heating terminal, and supplies the hot water to the heating terminal. It is possible to reliably supply hot water having a temperature different from that of the hot water to the heating terminal.

The heating hot water supply apparatus of one embodiment
A boiling three-way valve capable of supplying hot water from the heat pump unit to the upper part of the hot water storage tank or the lower part of the hot water storage tank is provided.

  According to the heating and hot water supply apparatus of the above embodiment, the boiling three-way valve supplies the hot water from the heat pump unit to the lower part of the hot water storage tank, so that the hot water in the hot water storage tank is stopped while the hot water supply operation and the heating operation are stopped. Freezing can be effectively prevented.

In the heating and hot water supply apparatus of one embodiment,
The predetermined reference value of the outside air temperature is determined by the heat insulating performance and floor area of the house where the heating terminal is installed.

  According to the heating and hot water supply apparatus of the above embodiment, the predetermined reference value of the outside air temperature is determined by the heat insulation performance and floor area of the house where the heating terminal is installed. Heating can be performed indoors.

In the heating and hot water supply apparatus of one embodiment,
The circulation circuit has an outgoing pipe through which the outgoing hot water flows, and a return pipe through which the return hot water flows,
One end is connected to the outgoing pipe, and the other end is provided with a bypass channel connected to the return pipe.

  According to the heating hot water supply apparatus of the above embodiment, since the bypass flow path is provided, a part of the return hot water that has exited the heating terminal flows to the outgoing pipe via the bypass flow path.

  Accordingly, since the amount of the return hot water flowing into the hot water storage tank is reduced, the hot water in the hot water storage tank can be prevented from being stirred.

  Further, by preventing the hot water in the hot water storage tank from being stirred, the hot water in the lower part of the hot water storage tank can be kept at a relatively low temperature, so the hot water in the lower part of the hot water storage tank is sent to the heat pump unit, COP can be kept high.

In the heating and hot water supply apparatus of one embodiment,
Between the point where the other end of the bypass flow path is connected to the return pipe and the hot water storage tank, a flow stop unit for stopping the flow of the return hot water is provided,
Determining means for determining whether the temperature of the return hot water is equal to or lower than a predetermined heating circuit return target temperature based on the output of the temperature sensor;
When the determining means determines that the temperature of the return hot water coming out of the heating terminal is equal to or lower than a predetermined heating circuit return target temperature, the return hot water is allowed to flow to the hot water storage tank via the circulation stop unit, and the hot water storage First flow control means for sending hot water in the lower part of the tank to the heat pump unit;
When the determination means determines that the temperature of the return warm water coming out of the heating terminal is not lower than a predetermined heating circuit return target temperature, the circulation of the return warm water to the hot water storage tank is stopped at the distribution stop unit, and Second flow control means for sending warm water in the lower part of the hot water storage tank to the heat pump unit.

  According to the heating and hot water supply apparatus of the above embodiment, since the circulation stop part is provided between the point where the other end of the bypass flow path is connected to the return pipe and the hot water storage tank, the return hot water flows between them. When the operation is stopped, the return hot water does not flow into the hot water storage tank and does not cause the hot water in the hot water storage tank to be stirred.

  Therefore, since the hot water in the lower part of the hot water storage tank can be reliably kept at a relatively low temperature, the hot water in the lower part of the hot water storage tank can be sent to the heat pump unit, and the COP of the heat pump unit can be reliably kept high.

In the heating and hot water supply apparatus of one embodiment,
The heat pump unit uses a CO ₂ refrigerant.

According to the heating and hot water supply apparatus of the above-described embodiment, the heat pump unit uses CO ₂ refrigerant, so that the heat pump unit can discharge hot water at a high temperature.

  According to the heating hot water supply apparatus of the present invention, by sending the hot water stored in the hot water storage tank to the heating terminal via the circulation path, the heat of the hot water can be efficiently supplied to the heating terminal without passing through the heat exchanger. For example, sufficient heating can be performed in an area with a high heating load such as a 24-hour heating operation in winter such as Northern Europe.

  Moreover, since the said temperature control part adjusts the temperature of the warm water which comes out of a heating terminal low, the temperature of the warm water in a hot water storage tank can be made low temperature and it can supply to a heat pump unit, Therefore COP of a heat pump unit can be made high. .

  Moreover, since the said temperature control part adjusts the temperature of the warm water which comes out of a heating terminal high, the temperature of the warm water in a hot water storage tank can be made high temperature, and can be supplied to a heating terminal, Therefore Heating capability can be made high.

  Hereinafter, the heating hot-water supply apparatus of this invention is demonstrated in detail by embodiment of illustration.

(First embodiment)
Drawing 1 is a mimetic diagram showing composition of a heating hot-water supply device of a 1st embodiment of the present invention.

  The heating and hot water supply apparatus includes a heat pump unit 1, a hot water storage tank 2, a hot water supply heat exchanger 3, and a heating circulation circuit 4. The hot water supply heat exchanger 3 is an example of a heat exchanger, and the heating circulation circuit 4 is an example of a circulation circuit.

  The heat pump unit 1 includes a refrigerant circuit 16 and an electric blower 17 and boiles water in the hot water storage tank 2 to make warm water.

The refrigerant circuit 16 includes an evaporator 11, a compressor 12, a condenser 13, a supercooling heat exchanger 14, and an expansion valve 15. In the refrigerant circuit 16, CO ₂ refrigerant circulates.

In the evaporator 11, the CO ₂ refrigerant absorbs heat in the air sent from the electric blower 17 and becomes high temperature. Then, the CO ₂ refrigerant, after further to high temperatures is compressed by the compressor 12, and reaches the condenser 13 emits heat. As a result, the CO ₂ refrigerant becomes lower in temperature than before entering the condenser 13 and flows toward the supercooling heat exchanger 14. The CO ₂ refrigerant is further cooled by the supercooling heat exchanger 14 and then returns to the evaporator 11 via the expansion valve 15.

  The heat pump unit 1 is connected to a hot water storage tank 2 via a boiling circulation circuit 5.

  The boiling circulation circuit 5 is provided with a boiling circulation pump 51 and a boiling three-way valve 52. The boiling circulation circuit 5 is connected to the second heating forward connection port 42, the heating supply port 53, and the antifreezing water return connection port 54. In addition, the said 2nd heating outgoing connection port 42 is an example of a 1st water intake port.

  The supply port 53 is provided in the lower part of the hot water storage tank 2. Thereby, the relatively low temperature hot water in the lower region in the hot water storage tank 2 can be supplied to the boiling circulation pump 51 through the supply port 53.

  The boiling circulation pump 51 sucks the relatively low temperature hot water in the lower region in the hot water storage tank 2 and discharges the sucked relatively low temperature hot water toward the condenser 13.

In the condenser 13, the CO ₂ refrigerant and hot water are heat-exchanged, and the hot water becomes high temperature. The hot hot water exiting the condenser 13 goes to the boiling three-way valve 52.

  The boiling three-way valve 52 allows hot hot water from the condenser 13 to flow to the upper region in the hot water storage tank 2 via the second heating forward connection port 42 during hot water supply operation and heating operation. In addition, when the heat pump unit 1 is activated, for example, when the hot water coming out of the condenser of the heat pump unit is not sufficiently hot, the hot water is returned not to the upper part of the hot water tank 2 but to the lower part of the hot water tank 2. The boiling three-way valve 52 is controlled so that By switching the return port according to the temperature of the hot water in this way, it is possible to prevent the hot water that is not sufficiently hot from returning to the upper part of the hot water storage tank 2 and disturbing the temperature distribution in the hot water storage tank 2.

  The hot water storage tank 2 stores hot water heated by the heat pump unit 1. In addition, a heater 6 is disposed at a substantially central portion in the vertical direction in the hot water storage tank 2, and the heater 6 directly heats the hot water in the hot water storage tank 2. Although not shown, a plurality of temperature sensors are provided in the hot water storage tank 2 in order to detect the temperature of hot water in each part in the hot water storage tank 2. The plurality of temperature sensors detect the temperature of hot water in each part in the hot water storage tank 2 and send a signal indicating the temperature to the control unit 7. The control unit 7 is an example of a control unit.

  A signal indicating the temperature of the hot water in the lower region in the hot water storage tank 2 is used for ON / OFF control of the compressor 12 and the boiling circulation pump 51. That is, the control unit 7 controls ON / OFF of the compressor 12 and the boiling circulation pump 51 based on the temperature of the hot water in the lower region in the hot water storage tank 2.

  The hot water heat exchanger 3 is formed of a coiled pipe and is arranged from the lower region to the upper region in the hot water storage tank 2. The hot water is heated by flowing through the hot water heat exchanger 3. More specifically, the hot water enters the hot water storage tank 2 from the lower part of the hot water storage tank 2 and flows upward through the hot water supply heat exchanger 3 arranged in the lower region of the hot water storage tank 2. The hot water flows through the hot water heat exchanger 3 disposed in the upper region of the hot water tank 2 upward, and then flows out of the hot water tank 2 from the upper part of the hot water tank 2.

  If the temperature of the hot water supplied from the hot water storage tank 2 is too high, the hot water mixing valve 31 is opened, and the hot water supplied from the hot water storage tank 2 and the hot water before flowing into the hot water storage tank 2 are separated. Mix together. Thereby, the temperature of the hot water supplied from the hot water storage tank 2 can be lowered.

  The heating circulation circuit 4 is for circulating the hot water stored in the hot water storage tank 2 again through the plurality of radiators 8 outside the hot water storage tank 2 and then returning it to the hot water storage tank 2. The heating circulation circuit 4 is connected to the first and second heating forward connection ports 41 and 42 and the heating return connection port 43. In addition, the said 1st heating outgoing connection port 41 is an example of a 2nd water intake port. The radiator 8 is an example of a heating terminal. As a heating terminal, a floor heating panel, a fan coil, or the like may be used instead of or in combination with this.

  The first heating outgoing connection port 41 is for taking out hot water in the hot water storage tank 2. The first heating / outgoing connection port 41 is provided at a substantially central portion in the vertical direction of the hot water storage tank 2, and is positioned near and above the heater 6. Thereby, the hot water immediately after being heated by the heater 6 can be taken out from the first heating forward connection port 41 and sent to the plurality of radiators 8.

  Similarly to the first heating forward connection port 41, the second heating forward connection port 42 is also for taking out hot water in the hot water storage tank 2. The second heating / outgoing connection port 42 is provided in the upper part of the hot water storage tank 2. Thereby, the hot water of the upper area | region in the said hot water storage tank 2 can be taken out from the 2nd heating outgoing connection port 42, and can be sent to the several radiator 8. FIG. The second heating / outgoing connection port 42 is also used as a heating return connection port.

  Each radiator 8 directly takes out the heat of the hot water flowing from the hot water storage tank 2 and discharges it into the room. And the said warm water becomes low temperature, leaves each radiator 8, and flows toward the heating return connection port 43. FIG.

  The heating return connection port 43 is provided in the lower part of the hot water storage tank 2. Thereby, the hot water which came out of the said heating return connection port 43 can be mixed with the hot water of the lower area | region in the hot water storage tank 2. FIG.

  The heating circulation circuit 4 is provided with a bypass pipe 44, a heating mixing valve 45, first and second temperature sensors 46 and 47, a heating circulation pump 48, and a heating three-way valve 49. The bypass pipe 44 is an example of a bypass flow path, the heating mixing valve 45 is an example of a mixing valve, the heating circulation pump 48 is an example of a circulation pump, the first temperature sensor 46 is an example of an outgoing hot water sensor, and the second temperature. The sensor 47 is an example of a return hot water sensor.

  The bypass pipe 44 guides a part of the hot water flowing from the radiator 8 to the heating return connection port 43 to the heating mixing valve 45.

  The heating mixing valve 45 has an inlet through which hot water from the hot water storage tank 2 flows and an inlet through which hot water from the bypass pipe 44 flows. Although described in detail later, the opening degree of each inlet of the heating mixing valve 45 is adjusted by the control unit 7.

  The first temperature sensor 46 detects the temperature of hot water from the hot water storage tank 2 toward the radiator 8 and sends a signal indicating this temperature to the control unit 7.

  The second temperature sensor 47 detects the temperature of hot water from the radiator 8 toward the hot water storage tank 2, and sends a signal indicating this temperature to the control unit 7.

  The control unit 7 receives a signal indicating the outside air temperature from the outside air temperature sensor 18 and also receives a signal indicating the room temperature from an indoor temperature sensor (not shown).

  The heating circulation pump 48 sucks the hot water in the hot water storage tank 2 through the second heating outgoing connection port 42 or the first heating outgoing connection port 41 and discharges it toward the radiators 8.

  The heating three-way valve 49 extracts hot water from the first heating forward connection port 41 when a high temperature region of the hot water in the hot water storage tank 2 exists in the vicinity of the first heating forward connection port 41. Further, the heating three-way valve 49 extracts hot water from the second heating forward connection port 42 when the high temperature region of the hot water in the hot water storage tank 2 does not exist in the vicinity of the first heating forward connection port 41. The control unit 7 switches the heating three-way valve 49. That is, the control unit 7 switches the heating three-way valve 49 based on signals from a plurality of temperature sensors for detecting the temperature of hot water in each part in the hot water storage tank 2.

  When the heating hot water supply apparatus having the above configuration starts the heating operation, the heating circulation pump 48 is operated. Thereby, the hot water stored in the hot water storage tank 2 is sent to the plurality of radiators 8 and returned to the hot water storage tank 2 again. At this time, the heat of the warm water is released into the room through the radiator 8. That is, each radiator 8 directly takes out the heat of the hot water in the hot water storage tank 2 and discharges it into the room.

  Therefore, since the heat of the hot water in the hot water storage tank 2 can be efficiently supplied to the radiator 8, sufficient heating can be performed even in an area with a high heating load such as Northern Europe.

  The hot water supply heat exchanger 3 is arranged from the lower region to the upper region in the hot water storage tank 2 and hot water enters the lower portion of the hot water storage tank 2 and exits from the upper portion of the hot water storage tank 2. Is sufficiently heated by the hot water in the hot water storage tank 2 while flowing in the hot water heat exchanger 3. Therefore, hot water can be discharged from the hot water supply heat exchanger 3.

  Further, since the hot water having a relatively low temperature by the radiator 8 returns to the hot water storage tank 2 from the heating return connection port 43, the relatively low temperature hot water can be returned to the lower region in the hot water storage tank 2. Therefore, it is possible to prevent the hot water having a relatively high temperature in the upper region in the hot water storage tank 2 from being mixed with the hot water having a relatively low temperature by the radiator 8 to become a low temperature.

  Moreover, since the supply port 53 is provided in the lower part of the said hot water storage tank 2, the comparatively low temperature warm water in the lower area | region in the hot water storage tank 2 is supplied to the condenser 13 of the heat pump unit 1. FIG. Therefore, the COP of the heat pump unit 1 is improved.

  When the heat pump unit 1 fails, the temperature of the hot water in the hot water storage tank 2 can be maintained or raised by directly heating the hot water in the hot water storage tank 2 with the heater 6.

  Further, even when the amount of heat given to the hot water by the heat pump unit 1 is insufficient, the amount of heat that is insufficient can be supplemented by the heater 6.

Moreover, since the heater 6 is disposed at a substantially central portion in the vertical direction in the hot water storage tank 2,
Mainly, the hot water above the heater 6 is heated. At this time, since the hot water in the upper region in the hot water storage tank 2 is originally higher in temperature than the hot water in the lower region in the hot water storage tank 2, it becomes higher in a short time due to the heating of the heater 6.

  Therefore, even if the heating load increases momentarily, the hot water having a higher temperature in the upper region in the hot water storage tank 2 can be immediately sent to the radiator 8.

  Further, when the heating load is momentarily increased during the heating operation, the hot water in the hot water storage tank 2 is heated to a high temperature by the heater 6, and this high temperature hot water is taken out from the first heating forward connection port 41 of the heating circulation circuit 4. Send to 8. At this time, the first heating / outgoing connection port 41 is provided at a substantially central portion in the vertical direction of the hot water storage tank 2 and is located near and above the heater 6, so that the hot water immediately after being heated by the heater 6 is taken out. Can be sent to the radiator 8.

  Therefore, even if the heating load increases momentarily, it is possible to quickly and reliably cope with the instantaneous increase in heating load.

Further, the heat pump unit 1, because it uses CO ₂ refrigerant as refrigerant, can be high temperature hot water.

  The control unit 7 adjusts the opening degree of each of the two inlets of the heating mixing valve 45 based on the signals from the outside air temperature sensor 18 and the first and second temperature sensors 46 and 47, or for heating. The rotational speed of the circulation pump 48 is adjusted.

  As a result, the temperature of warm water entering each radiator 8 (hereinafter referred to as “heating heating temperature”) or the temperature of warm water exiting from each radiator 8 (hereinafter referred to as “heating return temperature”) is adjusted. be able to.

  For example, when the control unit 7 reduces the opening degree of the inlet of the heating mixing valve 45 on the bypass pipe 44 side relative to the opening degree of the inlet of the heating mixing valve 45 on the hot water storage tank 2 side, Compared with the high temperature hot water amount from the low temperature, the low temperature hot water amount from the bypass piping 44 side decreases. As a result, the heating temperature can be increased.

  Conversely, when the controller 7 increases the opening degree of the heating mixing valve 45 on the bypass piping 44 side relative to the opening degree of the heating mixing valve 45 on the hot water storage tank 2 side, Compared with the high temperature hot water amount from the side, the low temperature hot water amount from the bypass pipe 44 side increases. As a result, the heating temperature can be lowered.

  Further, when the controller 7 increases the rotational speed of the heating circulation pump 48, the amount of hot water entering each radiator 8 increases. As a result, it is difficult for hot water to drop in each of the radiators 8, and the heating return temperature can be increased.

  Conversely, when the control unit 7 decreases the rotation speed of the heating circulation pump 48, the amount of hot water entering each radiator 8 decreases. As a result, the warm water can be easily lowered by the radiators 8 and the heating return temperature can be lowered.

  Further, when the control unit 7 determines that the outside air temperature detected by the outside air temperature sensor 18 is equal to or less than a predetermined reference value and the heating load is relatively large, based on the signal from the outside air temperature sensor 18, the heating capacity is increased. Priority is given to higher control.

  When the control unit 7 determines that the outside air temperature detected by the outside air temperature sensor 18 is higher than a predetermined reference value and the heating load is relatively small, based on the signal from the outside air temperature sensor 18, the heat pump unit 1. The control for improving the COP is preferentially performed.

  The reference value is determined by the heat insulating performance and floor area of the house where the radiator 8 is installed. Thus, it is accurately determined whether or not to preferentially perform the control for increasing the heating capacity, or preferentially perform the control for improving the COP of the heat pump unit 1. That is, appropriate heating can be performed for the room.

  Hereinafter, the control for increasing the heating capacity (heating return temperature control) and the control for improving the COP of the heat pump unit 1 (heating forward temperature control) will be described in more detail with reference to FIG.

  When the heating load is relatively large (when the heating load is on the left side of the dotted line in FIG. 2), the control unit 7 changes the heating return temperature according to the heating load and sets the heating forward temperature to 80 ° C., for example. keep. At this time, the heating return temperature increases as the heating load increases, and for example, 50 ° C. is set as the maximum value.

  Accordingly, since each of the radiators 8 is filled with 80 ° C. warm water, the heating capacity can be increased.

  When the heating temperature is kept at 80 ° C., the control unit 7 determines the two inlets of the heating mixing valve 45 based on signals from the outside air temperature sensor 18 and the first and second temperature sensors 46 and 47. Or the rotation speed of the heating circulation pump 48 is adjusted. Further, at that time, the control unit 7 determines the opening degree of each of the two inlets of the heating mixing valve 45 based on the signals from the outside air temperature sensor 18 and the first and second temperature sensors 46 and 47, and for heating. Of course, the rotational speed of the circulation pump 48 may be adjusted.

  In short, the control unit 7 may control at least one of the heating mixing valve 45 and the heating circulation pump 48 to keep the heating forward temperature at 80 ° C.

  Conversely, when the heating load is relatively small (when the heating load is on the right side of the dotted line in FIG. 2), the control unit 7 changes the heating forward temperature according to the heating load and sets the heating return temperature, for example, Keep at 30 ° C. At this time, the heating-out temperature is lowered as the heating load decreases.

  As a result, 30 ° C. warm water returns to the lower region in the hot water storage tank 2, so that the temperature of the hot water in the lower region in the hot water storage tank 2 is kept relatively low.

  Accordingly, since the relatively low temperature hot water in the lower region in the hot water storage tank 2 is supplied to the condenser 13 of the heat pump unit 1, the COP (coefficient of performance) of the heat pump unit 1 can be increased.

  When the heating return temperature is kept at 30 ° C., the control unit 7 determines the two inlets of the heating mixing valve 45 based on signals from the outside air temperature sensor 18 and the first and second temperature sensors 46 and 47, respectively. Or the rotation speed of the heating circulation pump 48 is adjusted. Further, at that time, the control unit 7 determines the opening degree of each of the two inlets of the heating mixing valve 45 based on the signals from the outside air temperature sensor 18 and the first and second temperature sensors 46 and 47, and for heating. Of course, the rotational speed of the circulation pump 48 may be adjusted.

  In short, the control unit 7 may control at least one of the heating mixing valve 45 and the heating circulation pump 48 to keep the heating return temperature at 30 ° C.

  In the first embodiment, the heating mixing valve 45 and the heating circulation pump 48 constitute an example of the temperature adjustment unit, but only one of the heating mixing valve 45 and the heating circulation pump 48 adjusts the temperature. An example of the unit may be configured, or one of the heating mixing valve 45 and the heating circulation pump 48 and the other device may configure an example of the temperature adjusting unit.

  In the first embodiment, the first temperature sensor 46 and the second temperature sensor 47 constitute an example of a temperature sensor, but only one of the first temperature sensor 46 and the second temperature sensor 47 is a temperature sensor. An example may be constituted, and the first temperature sensor 46, the second temperature sensor 47, another temperature sensor (for example, the outside air temperature sensor 18), etc. may constitute an example of the temperature sensor.

  In the first embodiment, the heating mixing valve 45 is provided in the heating circulation circuit 4 between the heating three-way valve 49 and the heating circulation pump 48, but between the heating circulation pump 48 and the radiator 8. A heating mixing valve 45 may be provided in the heating circulation circuit 4. That is, the heating mixing valve 45 may be provided on the suction side of the heating circulation pump 48 or may be provided on the discharge side of the heating circulation pump 48.

  In the first embodiment, the boiling three-way valve 52 flows hot hot water from the condenser 13 to the lower region in the hot water storage tank 2 during the freeze prevention operation, but in the upper region in the hot water storage tank 2. It may flow or may flow to the upper region and the lower region in the hot water storage tank 2.

In the first embodiment, the heat pump unit 1 uses a CO ₂ refrigerant, but an NH ₃ refrigerant, an R22 refrigerant, or the like may be used.

  In the said 1st Embodiment, although the heat pump unit 1 which has the supercooling heat exchanger 14 was used, you may use the heat pump unit which does not have the supercooling heat exchanger 14. FIG.

(Second Embodiment)
Drawing 3 is a mimetic diagram showing the composition of the heating hot-water supply device of a 2nd embodiment of the present invention. In FIG. 3, the same components as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals as those of the components in FIG. explain.

  The heating hot water supply apparatus includes a heating circulation circuit 4. The heating circulation circuit 4 includes a forward pipe 101 through which the forward hot water flows and a return pipe 102 through which the return hot water flows. Here, the outgoing hot water is hot water that enters the radiator 8, and the return hot water is hot water that exits from the radiator 5.

  The forward pipe 101 and the return pipe 102 can communicate with each other via a bypass pipe 44. That is, the bypass pipe 44 has one end connected to the forward pipe 101 and the other end connected to the return pipe 102.

  The return pipe 102 is provided with a second temperature sensor 147 that detects the temperature of the return warm water. The second temperature sensor 147 differs from the second temperature sensor 47 of the first embodiment only in the installation location.

  More specifically, the second temperature sensor 147 is provided between the point where the other end of the bypass pipe 44 is connected to the return pipe 102 and the radiator 8. The second temperature sensor 147 detects the temperature of the return hot water upstream from the connection point between the other end of the bypass pipe 44 and the return pipe 102, and sends a signal indicating this temperature to the control unit 7.

  The control unit 7 adjusts the opening degree of each of the two inlets of the heating mixing valve 45 based on the signals from the outside air temperature sensor 18 and the first and second temperature sensors 46 and 147, and the heating circulation pump. 48 rotation speed is adjusted.

  Hereinafter, according to the flowchart of FIG. 4, control of the heating operation by the said heating hot-water supply apparatus is demonstrated.

  When the heating operation starts, first, in step S1, it is determined whether or not the heating circuit return temperature is equal to or lower than a predetermined heating circuit return target temperature. That is, based on the output of the second temperature sensor 147, it is determined whether or not the temperature of the return hot water is equal to or lower than the heating circuit return target temperature. If it is determined in step 1 that the temperature of the return hot water is equal to or lower than the heating circuit return target temperature, this corresponds to a case where the heating load is relatively large. Therefore, after performing step S2, the process proceeds to step S4. On the other hand, if it is determined in step S1 that the temperature of the return hot water is not equal to or lower than the heating circuit return target temperature, this corresponds to a case where the heating load is relatively small. Therefore, after performing step S3, the process proceeds to step S4.

  In step S2, control for increasing the heating circuit flow rate is performed. Specifically, the rotational speed of the heating circulation pump 48 is increased by a preset rotational speed. Thereby, since the quantity of the going hot water which enters each said radiator 8 increases, each radiator 8 can fully heat.

  Further, in step S2, the opening degree of the heating mixing valve 45 on the bypass pipe 44 side and the heating mixing valve 45 side of the heating three-way valve 49 side so that the temperature of the return hot water becomes a set value. The temperature of the incoming hot water is controlled by adjusting the opening of the. The set value can be arbitrarily set by a user interface.

  In step S3, control is performed to reduce the heating circuit flow rate. Specifically, the rotational speed of the heating circulation pump 48 is decreased by a preset rotational speed. Thereby, since the amount of the outgoing hot water entering each radiator 8 is reduced, it is possible to prevent the outgoing hot water from being supplied to each radiator 8 in vain.

  Further, in step S3 as in step S2, the opening degree of the inlet on the bypass pipe 44 side of the heating mixing valve 45 and the three directions for heating of the heating mixing valve 45 are set so that the temperature of the return hot water becomes the set value. The temperature of the incoming hot water is controlled by adjusting the opening of the inlet on the valve 49 side. The set value can be arbitrarily set by a user interface.

  In said step S4, it is determined whether the heating operation stop operation was performed. If it determines with the stop operation of heating operation having been performed by this step S4, heating operation will be complete | finished. On the other hand, if it determines with the stop operation of heating operation not being performed by said step S4, it will return to step S1.

  Therefore, by setting the set values in steps S2 and S3 low, the low-temperature return hot water can be returned into the lower part of the hot water storage tank 2 regardless of the heating load.

  As a result, the temperature of the hot water in the lower part of the hot water storage tank 2 is kept low, so that the low temperature hot water can be continuously fed from the supply port 53 to the condenser 13 and the COP of the heat pump unit 1 can be kept high.

(Third embodiment)
FIG. 5 is a schematic diagram showing a configuration of a heating and hot water supply apparatus according to a third embodiment of the present invention. In FIG. 5, the same components as those of the second embodiment shown in FIG. 3 are denoted by the same reference numerals as those of the components in FIG. explain.

  The heating and hot water supply apparatus includes a shut-off valve 103. The shutoff valve 103 is provided between the connection point between the bypass pipe 44 and the return pipe 102 and the hot water storage tank 2. The shut-off valve 103 is an example of a distribution stop unit.

  Further, in the first and second embodiments, the heating circulation pump 48 that is a variable flow rate pump is provided in the circulation circuit 4, but in the third embodiment, the heating circulation pump 148 that is a fixed flow rate circulation pump. Is provided in the circulation circuit 4.

  Hereinafter, according to the flowchart of FIG. 6, control of the heating operation by the said heating hot-water supply apparatus is demonstrated.

  When the heating operation starts, first, in step S11, it is determined whether or not the heating circuit return temperature is equal to or lower than a predetermined heating circuit return target temperature. That is, based on the output of the second temperature sensor 147, it is determined whether or not the temperature of the return hot water is equal to or lower than the heating circuit return target temperature. If it is determined in step S11 that the temperature of the return hot water is equal to or lower than the heating circuit return target temperature, this corresponds to a case where the heating load is relatively large. Therefore, after performing step S12, the process proceeds to step S14. On the other hand, if it is determined in step S11 that the temperature of the return hot water is not lower than the heating circuit return target temperature, this corresponds to a case where the heating load is relatively small. Therefore, after performing step S13, the process proceeds to step S14.

  In step S12, the shutoff valve 103 is opened. As a result, the hot water in the upper part of the hot water storage tank 2 is actively supplied to the forward piping 101, or the warm water in the middle of the hot water storage tank 2 is actively supplied to the outgoing piping 101. Thus, each radiator 8 can perform sufficient heating.

  In step S12, the opening degree of the heating mixing valve 45 on the bypass pipe 44 side and the heating mixing valve 45 side of the heating three-way valve 49 side so that the temperature of the return hot water becomes a set value. The temperature of the incoming hot water is controlled by adjusting the opening of the. The set value can be arbitrarily set by a user interface.

  In step S13, the shutoff valve 103 is closed. Thereby, the return hot water does not flow into the hot water storage tank 2 and does not cause the hot water in the hot water storage tank 2 to be stirred. Therefore, since the hot water in the lower part of the hot water storage tank 2 can be reliably kept at a relatively low temperature, the hot water in the lower part of the hot water storage tank 2 can be sent to the heat pump unit to ensure that the COP of the heat pump unit is kept high. it can.

  In step S13, the inlet on the bypass piping 44 side of the heating mixing valve 45 is fixed in a fully open state, and the inlet on the heating three-way valve 49 side of the heating mixing valve 45 is fixed in a closed state. As a result, the amount of return hot water flowing into the hot water storage tank 2 is reduced, so that stirring of the hot water in the hot water storage tank 2 is reduced. Therefore, by preventing the hot water in the hot water storage tank 2 from being stirred, the hot water in the lower part of the hot water storage tank 2 can be kept at a relatively low temperature, so the hot water in the lower part of the hot water storage tank 2 is sent to the heat pump unit, The COP of the heat pump unit can be kept high.

  In step S14, it is determined whether or not a heating operation stop operation has been performed. If it determines with the stop operation of heating operation having been performed by this step S14, heating operation will be complete | finished. On the other hand, if it determines with the stop operation of heating operation not being performed by said step S14, it will return to step S11.

  In the above control, when the heating load is relatively large, the low-temperature return hot water can be returned to the lower part of the hot water storage tank 2 by setting the set value in step S12 low.

  As a result, the temperature of the hot water in the lower part of the hot water storage tank 2 is kept low, so that the low temperature hot water can be continuously fed from the supply port 53 to the condenser 13 and the COP of the heat pump unit 1 can be kept high.

  When the heating load is relatively small, the COP of the heat pump unit can be reliably kept high by closing the shutoff valve 103.

  That is, the said heating hot-water supply apparatus can keep COP of a heat pump unit high irrespective of a heating load.

(Fourth embodiment)
FIG. 7 is a schematic diagram showing the configuration of the heating and hot water supply apparatus according to the fourth embodiment of the present invention. Further, in FIG. 7, the same components as those in the second and third embodiments shown in FIGS. 3 and 5 have the same reference numerals as those in FIGS. A description will be omitted or will be briefly described.

  The heating and hot water supply apparatus includes a heating circulation pump 48 instead of the heating circulation pump 148.

  Hereinafter, according to the flowchart of FIG. 8, the control of the heating operation by the heating hot water supply apparatus will be described.

  When the heating operation starts, first, in step S21, it is determined whether or not the heating circuit return temperature is equal to or lower than a predetermined heating circuit return target temperature. That is, based on the output of the second temperature sensor 147, it is determined whether or not the temperature of the return hot water is equal to or lower than the heating circuit return target temperature. If it is determined in step S21 that the temperature of the return hot water is equal to or lower than the heating circuit return target temperature, this corresponds to a case where the heating load is relatively large, and the process proceeds to step S22. On the other hand, if it is determined in step S21 that the temperature of the return hot water is not lower than the heating circuit return target temperature, this corresponds to a case where the heating load is relatively small, and the process proceeds to step S23.

  When it progresses to said step S22, control which increases a heating circuit flow volume is performed. Specifically, the rotational speed of the heating circulation pump 48 is increased by a preset rotational speed. Thereby, since the quantity of the going hot water which enters each said radiator 8 increases, each radiator 8 can fully heat.

  In step S22, the opening of the inlet of the heating mixing valve 45 on the bypass piping 44 side and the inlet of the heating three-way valve 49 side of the heating mixing valve 45 so that the temperature of the return hot water becomes a set value. The temperature of the incoming hot water is controlled by adjusting the opening of the. The set value can be arbitrarily set by a user interface.

  After performing step S22, it is determined in step S25 whether or not a heating operation stop operation has been performed. If it determines with the stop operation of heating operation having been performed by this step S25, heating operation will be complete | finished. On the other hand, if it determines with the stop operation of heating operation not being performed by said step S25, it will return to step S21.

  On the other hand, when the process proceeds to step S23, it is determined whether or not the determination is continued for a predetermined number of times or more if the temperature of the return hot water is not lower than the heating circuit return target temperature. If it is determined in step S23 that the temperature of the return hot water is not lower than the heating circuit return target temperature, it is determined that the determination has not been continued a predetermined number of times or more, and the process proceeds to step S24. On the other hand, if it is determined in step S23 that the return hot water temperature is not equal to or lower than the heating circuit return target temperature and the determination continues for a predetermined number of times, the process proceeds to step S30 in FIG.

  When it progresses to said step S24, control which reduces a heating circuit flow volume is performed. Specifically, the rotational speed of the heating circulation pump 48 is decreased by a preset rotational speed. Thereby, since the amount of the outgoing hot water entering each radiator 8 is reduced, it is possible to prevent the outgoing hot water from being supplied to each radiator 8 in vain.

  Similarly to step S22, in step S24, the opening degree of the inlet on the bypass pipe 44 side of the heating mixing valve 45 and the three directions for heating of the heating mixing valve 45 are set so that the temperature of the return hot water becomes the set value. The temperature of the incoming hot water is controlled by adjusting the opening of the inlet on the valve 49 side. The set value can be arbitrarily set by a user interface.

  After performing said step S24, it is determined by step S25 whether the heating operation stop operation was performed. If it determines with the stop operation of heating operation having been performed by this step S25, heating operation will be complete | finished. On the other hand, if it determines with the stop operation of heating operation not being performed by said step S25, it will return to step S21.

  On the other hand, when it progresses to step S30 of FIG. 8, since it corresponds to the case where the heating load is comparatively small for a long time, the cutoff valve 103 is closed. Thereby, the return hot water does not flow into the hot water storage tank 2 and does not cause the hot water in the hot water storage tank 2 to be stirred. Therefore, since the hot water in the lower part of the hot water storage tank 2 can be reliably kept at a relatively low temperature, the hot water in the lower part of the hot water storage tank 2 can be sent to the heat pump unit to ensure that the COP of the heat pump unit is kept high. it can.

  Next, in step S31, the inlet on the bypass piping 44 side of the heating mixing valve 45 is fixed in a fully opened state, and the inlet on the heating three-way valve 49 side of the heating mixing valve 45 is fixed in a closed state. As a result, the amount of return hot water flowing into the hot water storage tank 2 is reduced, so that stirring of the hot water in the hot water storage tank 2 is reduced. Therefore, by preventing the hot water in the hot water storage tank 2 from being stirred, the hot water in the lower part of the hot water storage tank 2 can be kept at a relatively low temperature, so the hot water in the lower part of the hot water storage tank 2 is sent to the heat pump unit, The COP of the heat pump unit can be kept high.

  After performing step S31, it is determined in step S32 whether the heating circuit return temperature is equal to or lower than a predetermined heating circuit return target temperature. That is, based on the output of the second temperature sensor 147, it is determined whether or not the temperature of the return hot water is equal to or lower than the heating circuit return target temperature. If it is determined in step S32 that the temperature of the return hot water is equal to or lower than the heating circuit return target temperature, this corresponds to a case where the heating load is relatively large, and the process proceeds to step S33. On the other hand, if it is determined in step S32 that the temperature of the return hot water is not lower than the heating circuit return target temperature, this corresponds to the case where the heating load is still relatively small, and the process returns to step S31.

  When the process proceeds to step S33, the heating load is relatively large. Therefore, after opening the shut-off valve 103, the process proceeds to step S22 in FIG. 8, and the above-described processing is performed.

  The control as described above can return the low-temperature return hot water into the lower part of the hot water storage tank 2 regardless of the heating load by setting the set values in steps S22 and S24 low.

  As a result, the temperature of the hot water in the lower part of the hot water storage tank 2 is kept low, so that the low temperature hot water can be continuously fed from the supply port 53 to the condenser 13 and the COP of the heat pump unit 1 can be kept high.

  Further, when the heating load is relatively small, the COP of the heat pump unit can be reliably kept high by closing the shutoff valve 103.

  The heating hot water supply apparatus of the said 1st Embodiment, 2nd Embodiment, and 4th Embodiment can also control heating operation, as shown to the flowchart of FIG.

  In the heating operation control, when the heating operation is started, first, in step S41, it is determined whether or not the heating circuit return temperature is equal to or lower than a predetermined heating circuit return target temperature. That is, based on the outputs of the second temperature sensors 47 and 147, it is determined whether or not the temperature of the return hot water is equal to or lower than the heating circuit return target temperature. If it is determined in step 41 that the temperature of the return hot water is equal to or lower than the heating circuit return target temperature, this corresponds to a case where the heating load is relatively large. Therefore, after performing step S42, the process proceeds to step S44. On the other hand, when it is determined in step S41 that the temperature of the return hot water is not lower than the heating circuit return target temperature, this corresponds to a case where the heating load is relatively small. Therefore, after performing step S43, the process proceeds to step S44.

  In step S42, control for increasing the heating circuit flow rate is performed. Specifically, the rotational speed of the heating circulation pump 48 is increased by a preset rotational speed. As a result, the amount of outgoing hot water entering each radiator 8 can be increased, and the heating capacity of each radiator 8 can be increased.

  In step S43, control is performed to reduce the heating circuit flow rate. Specifically, the rotational speed of the heating circulation pump 48 is decreased by a preset rotational speed. As a result, the amount of hot water going into each radiator 8 can be reduced, and the heating capacity of each radiator 8 can be lowered.

  Next, in step S44, it is determined whether or not the heating circuit going temperature is equal to or lower than a predetermined heating circuit going target temperature. That is, based on the output of the first temperature sensor 46, it is determined whether or not the temperature of the outgoing hot water is equal to or lower than the heating circuit outgoing target temperature. If it is determined in step 44 that the temperature of the outgoing hot water is equal to or lower than the heating circuit outgoing target temperature, this corresponds to a case where the heating load is relatively large. Therefore, after performing step S45, the process proceeds to step S47. On the other hand, if it is determined in step S44 that the temperature of the outgoing hot water is not equal to or lower than the heating circuit outgoing target temperature, this corresponds to a case where the heating load is relatively small. Therefore, after performing step S46, the process proceeds to step S47.

  In step S45, the heating mixing valve opening is adjusted in order to increase the heating circuit going temperature. That is, the opening degree of the inlet on the bypass pipe 44 side of the heating mixing valve 45 is lowered by a preset amount, and the opening degree of the inlet of the heating mixing valve 45 side on the heating three-way valve 49 side is preset. Raise it.

  In step S46, the heating mixing valve opening is adjusted in order to lower the heating circuit going temperature. That is, the opening degree of the heating mixing valve 45 on the bypass pipe 44 side is increased by a predetermined amount, and the opening degree of the heating mixing valve 45 on the heating three-way valve 49 side is set in advance. Decrease it.

  Next, in step S47, it is determined whether or not a heating operation stop operation has been performed. If it is determined in step S47 that the heating operation has been stopped, the heating operation is terminated. On the other hand, if it determines with the stop operation of heating operation not being performed by said step S47, it will return to step S41.

  As described above, by performing the steps S42 and S45, when the heating load is relatively large, the heating capacity of each radiator 8 can be reliably increased.

  Further, by performing the above steps S43 and S44, when the heating load is relatively small, the heating capacity of each radiator 8 can be reliably lowered.

  Instead of the above step S42, the opening degree of the inlet of the heating mixing valve 45 on the bypass pipe 44 side is reduced by a preset amount, and the inlet of the heating three-way valve 49 side of the heating mixing valve 45 is opened. The degree may be increased by a preset amount. Alternatively, the rotational speed of the heating circulation pump 48 is increased by a predetermined rotational speed, and the opening degree of the inlet of the heating mixing valve 45 on the bypass pipe 44 side is decreased by a predetermined amount, and You may make it perform the step which raises the opening degree of the entrance by the side of the three-way valve 49 for heating of the mixing valve 45 for heating by the preset amount.

  Further, instead of step S43, the opening degree of the inlet of the heating mixing valve 45 on the bypass pipe 44 side is increased by a preset amount, and the inlet of the heating three-way valve 49 side of the heating mixing valve 45 is opened. The degree may be lowered by a preset amount. Alternatively, the rotation speed of the heating circulation pump 48 is decreased by a preset rotation speed, and the opening degree of the inlet on the bypass pipe 44 side of the heating mixing valve 45 is increased by a preset value, and You may make it perform the step which reduces the opening degree of the inlet_port | entrance by the side of the three-way valve 49 for heating of the mixing valve 45 for heating by the preset amount.

  Further, instead of step S45, the rotation speed of the heating circulation pump 48 may be increased by a preset rotation speed. Alternatively, the opening degree on the bypass piping 44 side of the heating mixing valve 45 is decreased by a preset amount, and the opening degree on the heating three-way valve 49 side of the heating mixing valve 45 is preset. And the step of increasing the rotational speed of the heating circulation pump 48 by a preset rotational speed may be performed.

  Further, instead of step S46, the rotational speed of the heating circulation pump 48 may be decreased by a preset rotational speed. Alternatively, the opening degree of the heating mixing valve 45 on the bypass pipe 44 side is increased by a preset amount, and the opening degree of the heating mixing valve 45 on the heating three-way valve 49 side is set in advance. And the step of lowering the rotational speed of the heating circulation pump 48 by a preset rotational speed may be performed.

  In the flowchart of FIG. 10, the heating operation control in which step S42 is the same step as step S45 and step S43 is the same step as step S45 can also be performed in the heating and hot water supply apparatus of the third embodiment. it can.

The heating and hot water supply apparatuses of the first to fourth embodiments and the modifications thereof include the heat pump unit 1 that uses a CO ₂ refrigerant, but includes a heat pump unit that uses a supercritical refrigerant other than the CO ₂ refrigerant. Also good.

FIG. 1 is a schematic diagram of a heating and hot water supply apparatus according to a first embodiment of the present invention. FIG. 2 is a graph for explaining the control of the heating and hot water supply apparatus of the first embodiment. FIG. 3 is a schematic diagram of a heating and hot water supply apparatus according to a second embodiment of the present invention. FIG. 4 is a flowchart of the heating operation control of the heating and hot water supply apparatus according to the second embodiment. FIG. 5 is a schematic diagram of a heating and hot water supply apparatus according to a third embodiment of the present invention. FIG. 6 is a flowchart of the heating operation control of the heating and hot water supply apparatus according to the third embodiment. FIG. 7 is a schematic diagram of a heating and hot water supply apparatus according to a fourth embodiment of the present invention. FIG. 8 is a flowchart of the heating operation control of the heating and hot water supply apparatus of the fourth embodiment. FIG. 9 is a flowchart of the heating operation control of the heating and hot water supply apparatus according to the fourth embodiment. FIG. 10 is a flowchart of another heating operation control of the heating hot water supply apparatus of the first embodiment, the second embodiment, and the fourth embodiment.

DESCRIPTION OF SYMBOLS 1 Heat pump unit 2 Hot water storage tank 3 Heat exchanger 4 for hot water supply Circulation circuit 6 for heating 6 Heater 8 Radiator 41 1st heating forward connection port 42 2nd heating forward connection port 44 Bypass piping 45 Heating mixing valve 46 1st temperature sensor 47, 147 Second temperature sensor 48 Heating circulation pump 52 Heating three-way valve 101 Outward piping 102 Return piping 103 Shut-off valve

Claims (14)

Heat pump unit (1),
A hot water storage tank (2) for storing hot water heated by the heat pump unit (1);
A heat exchanger (3) which is disposed in the hot water storage tank (2) and in which hot water flows inside;
A circulation circuit for circulating the hot water stored in the hot water storage tank (2) through the heating terminal (8) outside the hot water storage tank (2) and then returning it to the hot water storage tank (2) for circulation. (4) and
A temperature sensor (46, 47, 147) for detecting the temperature of the hot water flowing through the circulation circuit (4);
By adjusting at least one of the temperature and flow rate of the hot water supplied to the heating terminal (8), the temperature of the return hot water coming out of the heating terminal (8) and the temperature of the incoming hot water entering the heating terminal (8) A temperature adjusting unit (45, 48) for adjusting at least one of the temperature to a predetermined temperature;
An outside air temperature sensor (18) for detecting the outside air temperature;
The temperature sensor (46, 47, 147) receives an output indicating the temperature of the hot water flowing through the circulation circuit (4), and the outside air temperature sensor (18) receives an output indicating the outside air temperature, A control unit (7) for controlling the temperature adjusting unit (45, 48) based on the output of the temperature sensor (46, 47, 147) and the output of the outside air temperature sensor (18);
The temperature sensors (46 , 47 , 147 ) are provided with a return hot water sensor (47 , 147 ) for detecting the temperature of the return hot water coming out of the heating terminal (8) and the temperature of the return hot water entering the heating terminal (8). look including a heated hot water sensor for detecting (46),
During the heating operation of the heat pump unit (1), the control unit (7) is configured such that the outside air temperature detected by the outside air temperature sensor (18) is based on the signal from the outside air temperature sensor (18). If it is determined that the heating load is relatively large and the heating load is relatively large, the first control for increasing the heating capacity of the heating terminal (8) is preferentially performed, while the first control is performed based on the signal from the outside temperature sensor (18). When it is determined that the outside air temperature detected by the outside air temperature sensor (18) is higher than a predetermined reference value and the heating load is relatively small, the second control for improving the coefficient of performance of the heat pump unit (1) is performed. Give priority,
In the first control, the controller (7) determines in advance the temperature of the return warm water coming out of the heating terminal (8) based on the outside air temperature based on the output of the return warm water sensor (47). The temperature control unit (48) is controlled so as to return to the hot water temperature,
In the second control, the controller (7) determines the temperature of the incoming hot water entering the heating terminal (8) based on the outside air temperature based on the output of the outgoing hot water sensor (46). A heating and hot water supply apparatus, wherein the temperature adjusting unit (45) is controlled so as to reach an outgoing hot water temperature . In the heating hot water supply apparatus according to claim 1,
The temperature adjusting unit (45, 48) adjusts at least one of the temperature and flow rate of hot water supplied to the heating terminal (8), thereby returning the temperature of the return hot water coming out of the heating terminal (8), and A heating and hot water supply apparatus for adjusting the temperature of the incoming hot water entering the heating terminal (8). In the heating hot-water supply apparatus of Claim 1 or 2 ,
A first water intake (42) for taking out hot water stored in the hot water storage tank (2) is provided at the upper part of the hot water storage tank (2), while the heating air is provided at the lower part of the hot water storage tank (2). A return port (43) is provided for returning hot water from the terminal (8) to the hot water storage tank (2).
The heating and hot water supply apparatus, wherein the circulation circuit (4) is connected to the first water intake port (42) and the return port (43). In the heating hot-water supply apparatus of Claim 3 ,
A heating port characterized in that a supply port (53) for supplying hot water stored in the hot water storage tank (2) to the heat pump unit (1) is provided below the hot water storage tank (2). Hot water supply device. In the heating hot-water supply apparatus as described in any one of Claim 1 to 4 ,
A heating and hot water supply apparatus, wherein a heater (6) is disposed at a substantially central portion in the vertical direction in the hot water storage tank (2). In the heating hot-water supply apparatus of Claim 5 ,
A second water intake (41) for taking out the hot water stored in the hot water storage tank (2) is located near and above the heater (6) at a substantially central portion in the vertical direction of the hot water storage tank (2). Provided to
The heating and hot water supply apparatus, wherein the circulation circuit (4) is connected to the second water intake (41). In the heating hot-water supply apparatus as described in any one of Claim 1-6 ,
The heat exchanger (3) is arranged from the lower region to the upper region in the hot water storage tank (2), and hot water enters the lower part of the hot water storage tank (2) and enters the hot water storage tank (2). A heating and hot water supply device characterized by exiting from the top. In heating and hot water supply apparatus according to any one of claims 1 to 7,
The temperature control unit (45, 48) is provided with a circulation pump (48) provided in the circulation circuit (4) between the hot water storage tank (2) and the heating terminal (8) and capable of adjusting the rotation speed. A heating and hot water supply apparatus comprising: In the heating hot-water supply apparatus as described in any one of Claim 1-8 ,
The temperature control unit (45, 48) mixes the hot water that leaves the hot water storage tank (2) and goes to the heating terminal (8) and the hot water that comes out of the heating terminal (8) to mix the heating terminal. A heating and hot water supply apparatus including a mixing valve (45) for supplying to (8). In heating and hot water supply apparatus according to any one of claims 1 to 9,
A boiling three-way valve (52) capable of supplying hot water from the heat pump unit (1) to the upper part of the hot water storage tank (2) or the lower part of the hot water storage tank (2) is provided. Heating water heater. In the heating hot water supply apparatus according to claim 1,
The heating / hot water supply apparatus characterized in that the predetermined reference value of the outside air temperature is determined by the heat insulating performance and floor area of a house where the heating terminal (8) is installed. In the heating hot-water supply apparatus as described in any one of Claim 1 to 11,
The circulation circuit (4) has an outgoing pipe (101) through which the outgoing hot water flows, and a return pipe (102) through which the return hot water flows.
A heating and hot water supply apparatus comprising a bypass passage (44) having one end connected to the forward pipe (101) and the other end connected to the return pipe (102). In heating and hot water supply apparatus according to claim 1 2,
Between the point where the other end of the bypass flow path (44) is connected to the return pipe (102) and the hot water storage tank (2), there is provided a flow stop portion (103) for stopping the flow of the return hot water. And
Determination means (S11) for determining whether the temperature of the return warm water is equal to or lower than a predetermined heating circuit return target temperature based on the output of the temperature sensor (147);
When the determination means (S11) determines that the temperature of the return hot water coming out of the heating terminal (8) is equal to or lower than a predetermined heating circuit return target temperature, the return hot water is passed through the distribution stop unit (103). First flow control means (S12) for flowing into the hot water storage tank (2);
When the determination means (S11) determines that the temperature of the return hot water coming out of the heating terminal (8) is not lower than a predetermined heating circuit return target temperature, the flow of the return hot water to the hot water storage tank (2) is A heating and hot water supply apparatus comprising: a second distribution control means (S13) for stopping hot water in the hot water storage tank (2) to the heat pump unit (1) while stopping at the distribution stop unit (103). In heating and hot water supply apparatus according to any one of claims 1 to 1 3,
The heat pump unit (1) uses a CO ₂ refrigerant and is a heating and hot water supply apparatus.

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