JP2019035562A - Hot water supply and heating system - Google Patents

Abstract

To provide a technology to improve energy efficiency by creating a state in which the temperature of a heating medium for heating is caused to be increased easily.SOLUTION: A hot water supply and heating system can execute a hot water supply and heating operation for heating a heating medium for supplying hot water by a heat pump, a heating operation for heating for heating the heating medium for heating by the heat pump, and an auxiliary heating operation for heating the heating medium for heating by an auxiliary heat source machine. When the hot water supply and heating operation and the heating operation for heating are executed simultaneously, and the auxiliary heating operation is executed, the control device executes reduction processing for reducing the flow rate of the heating medium for supplying hot water that circulates between a tank and the heat pump by controlling flow rate adjusting means.SELECTED DRAWING: Figure 4

Description

  The technology disclosed in the present specification relates to a hot water supply and heating system.

  The hot water supply and heating system disclosed in Patent Document 1 includes a heat pump, an auxiliary heat source device, and a tank. The heat pump includes a compressor that pressurizes the refrigerant, a condenser that condenses the refrigerant by exchanging heat between the refrigerant and the heating medium, and heat exchange between the refrigerant and the heating medium. A pressure reducing mechanism for reducing the pressure and an evaporator for evaporating the refrigerant by exchanging heat between the refrigerant and the natural environment are provided. The auxiliary heat source machine heats the heating medium by burning fuel. The tank stores a hot water heating medium heated by a heat pump. In addition, the hot water supply / heating system has a flow rate of a hot water supply device that supplies hot water using a hot water supply medium, a heating device that uses a heating heat medium, and a hot water supply medium that circulates between a tank and a heat pump. A flow rate adjusting means for adjusting and a control device are provided.

  In this hot water supply and heating system, a hot water supply heating operation for heating a hot water supply heat medium by a heat pump, a heating heating operation for heating a heating heat medium by a heat pump, and an auxiliary heating operation for heating the heating heat medium by an auxiliary heat source device are executed. Is possible. In this hot water supply / heating system, the hot water supply heating operation and the heating / heating operation are simultaneously performed.

JP 2014-16103 A

  When the hot water supply heating operation and the heating heating operation are simultaneously performed in the hot water supply / heating system, the heat of the refrigerant in the heat pump is distributed to the heating heat medium and the hot water supply heat medium by heat exchange. Therefore, since the heat of the refrigerant is used simultaneously for heating the heating medium and for heating the hot water supply medium, the heating may be insufficient. In particular, the temperature of the heating medium for heating may not be sufficiently increased. If the temperature of the heating medium is not sufficiently high, it is necessary to perform an auxiliary heating operation, and energy efficiency is reduced. However, when the temperature of the heating medium after being heated by the heat pump is increased, if the temperature of the heating medium after being heated by the heat pump is lowered, the hot water heating operation is affected. This specification provides a technology that can increase the temperature of a heating medium without reducing the temperature of the heating medium when the heating medium and the heating medium are simultaneously heated by a heat pump. To do.

  The hot water supply and heating system disclosed in this specification includes a compressor that pressurizes the refrigerant, heat exchange between the refrigerant and the hot water heating medium, and heat exchange between the refrigerant and the heating heat medium. A condenser for condensing, a decompression mechanism for decompressing the refrigerant, a heat pump having an evaporator for evaporating the refrigerant by exchanging heat between the refrigerant and the natural environment, and an auxiliary for heating the heating heat medium by fuel combustion A heat source machine, a tank for storing a hot water supply heating medium heated by the heat pump, a hot water supply apparatus for supplying hot water using a hot water supply heat medium, a heating apparatus for heating using a heating heat medium, and the tank A flow rate adjusting means for adjusting the flow rate of the hot water heating medium circulating between the heat pumps and a control device are provided. In this hot water supply and heating system, hot water supply heating operation for heating the hot water supply heat medium by the heat pump, heating heating operation for heating the heating heat medium by the heat pump, and auxiliary heating for heating the heating heat medium by the auxiliary heat source device When the hot water supply heating operation and the heating heating operation are executed at the same time and the auxiliary heating operation is executed, the control device controls the flow rate adjusting means to perform the operation. And a reduction process for decreasing the flow rate of the hot water heating medium circulating between the heat pump and the heat pump.

  In the hot water supply and heating system described above, heat exchange is performed between the refrigerant and the hot water supply heat medium in the condenser to heat the hot water supply heat medium. Further, in the condenser, heat exchange is performed between the refrigerant and the heating medium, and the heating medium is heated. In addition, the refrigerant is condensed by heat exchange in the condenser. A relatively high temperature refrigerant flows into the condenser, condenses in the condenser, and a relatively low temperature refrigerant flows out of the condenser. In this hot water supply and heating system, when the hot water supply heating operation for heating the hot water supply heating medium and the heating heating operation for heating the heating heat medium are executed at the same time and the auxiliary heating operation is executed, the control device adjusts the flow rate. By controlling the means to reduce the flow rate of the hot water supply heat medium circulating between the tank and the heat pump, it is used for heating the hot water supply heat medium out of the heat quantity of the refrigerant radiating heat in the condenser. The amount of heat is reduced, and the supercooling region when the refrigerant is condensed in the condenser is shortened. As a result, after the flow rate of the hot water supply heat medium is decreased, the temperature of the refrigerant flowing out of the condenser becomes higher than before the decrease.

  In the condenser, the hot water heating medium and the heating medium are heated. The heating medium has a relatively high temperature even after the heat is radiated by the heating device, and the heating medium flowing into the condenser has a relatively high temperature. For this reason, in most cases, the heating medium flowing into the condenser has a higher temperature than the temperature of the refrigerant flowing out of the condenser. Therefore, the heating medium flowing into the condenser dissipates heat by heat exchange with the low-temperature refrigerant, and the temperature temporarily decreases. Thereafter, the temperature of the heating medium increases due to heat exchange with a higher-temperature refrigerant. The heating medium whose temperature has risen flows out of the condenser.

  Comparing before and after the decrease in the flow rate of the hot water supply heat medium, as described above, the temperature of the refrigerant flowing out of the condenser becomes higher after the decrease in the flow rate of the hot water supply heat medium than before the decrease. Therefore, the difference between the temperature of the heating heat medium flowing into the condenser and the temperature of the refrigerant flowing out of the condenser is reduced. As a result, when the temperature of the heating medium flowing into the condenser temporarily decreases, the decrease in the temperature of the heating medium is relatively small. Accordingly, after the flow rate of the hot water supply heat medium is decreased, the temperature of the heating heat medium flowing out of the condenser becomes higher than before the decrease.

  On the other hand, since the hot water supply heat medium is cold water supplied from, for example, tap water, the temperature of the hot water supply heat medium flowing into the condenser is relatively low, and is lower than the temperature of the refrigerant flowing out of the condenser. . Therefore, the hot water supply heat medium flowing into the condenser does not cause a temporary temperature decrease due to heat dissipation to the refrigerant, and always rises in temperature by heat exchange with the high-temperature refrigerant. The hot water heating medium whose temperature has risen flows out of the condenser.

  Comparing before and after the decrease of the flow rate of the hot water supply heat medium, as described above, unlike the case of the heating heat medium, the temperature of the hot water supply heat medium does not temporarily decrease in the condenser. Even if the temperature of the refrigerant flowing out of the condenser increases, the temperature of the hot water supply medium flowing out of the condenser hardly changes.

  As described above, according to the hot water supply and heating system, when the hot water supply heating operation and the heating heating operation are performed at the same time and the auxiliary heating operation is performed, the control device controls the flow rate adjusting means to By performing a reduction process that reduces the flow rate of the hot water supply heat medium circulating between the heat pumps, the above-described mechanism can increase the temperature of the heating heat medium without lowering the temperature of the hot water supply heat medium. it can. Thereby, it is possible to suppress the execution of the auxiliary heating operation and to increase the energy efficiency.

  The hot water supply and heating system may further include heat storage amount detection means for detecting the heat storage amount of the hot water supply heat medium stored in the tank. Further, when the heat storage amount detected by the heat storage amount detection means is less than a predetermined first reference heat storage amount, the control device may prohibit the reduction process.

  When the heat storage amount detected by the heat storage amount detection means is less than the predetermined first reference heat storage amount, it is desirable to quickly increase the heat storage amount of the hot water supply heat medium stored in the tank. Therefore, in this case, it is not desirable to reduce the flow rate of the hot water supply heating medium heated by the heat pump. Therefore, in this case, the control device prohibits the reduction process. According to this configuration, the flow rate of the hot water heating medium heated by the heat pump can be maintained, and the heat storage amount of the hot water heating medium stored in the tank is rapidly increased by the amount that the flow rate of the hot water heating medium does not decrease. Can be made.

  In the hot water supply and heating system, after the reduction process is executed, when the hot water supply heating operation and the heating heating operation are executed simultaneously and the auxiliary heating operation is not executed, the control device You may perform the increase process which controls the flow volume adjustment means and increases the flow volume of the hot water supply heat medium which circulates between the said tank and the said heat pump.

  If the hot water supply heating operation and the heating heating operation are performed at the same time after the reduction process is performed, and the auxiliary heating operation is not performed, the temperature of the heating medium is considered to be sufficiently high. Therefore, the amount of heat used for heating the heating medium may be reduced. Further, in the hot water supply and heating system after the reduction process is executed, it takes a long time to store heat in the tank. Therefore, it is preferable to return the operation of the hot water supply and heating system to the normal operation. Therefore, in this case, the control device executes an increase process. According to this configuration, the amount of heat used for heating the hot water supply heat medium is increased by increasing the flow rate of the hot water supply heat medium heated by the heat pump while the hot water supply heating operation and the heating heating operation are performed simultaneously. The amount of heat used for heating the heating medium is relatively decreased. Moreover, the operation of the hot water supply / heating system can be returned to the normal operation.

  In addition, the hot water supply and heating system disclosed in the present specification allows heat exchange between the compressor that pressurizes the refrigerant, the refrigerant and the heating medium for hot water supply, and heat exchange between the refrigerant and the heating medium for heating, A condenser that condenses the refrigerant, a decompression mechanism that decompresses the refrigerant, a heat pump that includes an evaporator that evaporates the refrigerant by exchanging heat between the refrigerant and the natural environment, and a heating medium heated by the heat pump Temperature detecting means for detecting the temperature of the heating, an auxiliary heat source device for heating the heating medium by combustion of fuel, a tank for storing the hot water heating medium heated by the heat pump, and hot water supply using the hot water heating medium A water heater for heating, a heater for heating using a heating medium, a flow rate adjusting means for adjusting the flow rate of the hot water medium circulating between the tank and the heat pump, and a controller.In this hot water supply and heating system, hot water supply heating operation for heating the hot water supply heat medium by the heat pump, heating heating operation for heating the heating heat medium by the heat pump, and auxiliary heating for heating the heating heat medium by the auxiliary heat source device The temperature of the heating medium detected by the temperature detecting means can be determined in a state where the operation can be performed, the hot water heating operation and the heating heating operation are performed simultaneously, and the auxiliary heating operation is not performed. When the temperature is equal to or lower than a predetermined first reference temperature, the control device executes a reduction process of controlling the flow rate adjusting means to reduce the flow rate of the hot water supply heat medium circulating between the tank and the heat pump.

  According to this configuration, when the temperature of the heating medium detected by the temperature detection unit is equal to or lower than the predetermined first reference temperature in a state where the auxiliary heating operation is not performed, the same mechanism as that described above. Thus, the temperature of the heating heat medium can be increased without reducing the temperature of the hot water supply heat medium. Thereby, it is possible to suppress the execution of the auxiliary heating operation and to increase the energy efficiency.

  In the hot water supply and heating system, the temperature of the heating medium detected by the temperature detecting means is determined in a state where the hot water supply heating operation and the heating heating operation are performed simultaneously and the auxiliary heating operation is not performed. The control device may execute the reduction process when the temperature is equal to or lower than the predetermined first reference temperature over a predetermined first reference time.

  According to this configuration, there is a delay of the predetermined first reference time when the control device determines whether or not the temperature of the heating medium is equal to or lower than the predetermined first reference temperature. Even if the temperature of the heating medium suddenly changes, the reduction process is not executed if the temperature changes within the grace period (first reference time). Therefore, even if the temperature of the heating heat medium suddenly changes, the flow rate of the hot water heating medium does not decrease, and the flow rate of the hot water heating medium can be appropriately managed. Thereby, the temperature of the heating medium can be appropriately managed.

  The hot water supply and heating system may further include heat storage amount detection means for detecting the heat storage amount of the hot water supply heat medium stored in the tank. Further, when the heat storage amount detected by the heat storage amount detection means is less than a predetermined second reference heat storage amount, the control device may prohibit the reduction process.

  When the heat storage amount detected by the heat storage amount detection means is less than the predetermined second reference heat storage amount, it is desirable to quickly increase the heat storage amount of the hot water supply heat medium stored in the tank. Therefore, in this case, it is not desirable to reduce the flow rate of the hot water supply heating medium heated by the heat pump. Therefore, in this case, the control device prohibits the reduction process. According to this configuration, the flow rate of the hot water heating medium heated by the heat pump can be maintained, and the heat storage amount of the hot water heating medium stored in the tank is rapidly increased by the amount that the flow rate of the hot water heating medium does not decrease. Can be made.

  Further, in the hot water supply and heating system, the temperature detection unit is configured in a state where the hot water supply heating operation and the heating heating operation are simultaneously performed after the reduction process is performed and the auxiliary heating operation is not performed. When the temperature of the heating heat medium detected by the control unit is equal to or higher than a predetermined second reference temperature, the control device controls the flow rate adjusting means to circulate between the tank and the heat pump. An increase process for increasing the flow rate of the image may be executed.

  After the reduction process is executed, the temperature of the heating medium detected by the temperature detecting means is set to a predetermined value in a state where the hot water supply heating operation and the heating heating operation are executed simultaneously and the auxiliary heating operation is not executed. When the temperature is equal to or higher than two reference temperatures, it is considered that the temperature of the heating medium is sufficiently high, and thus the amount of heat used for heating the heating medium may be reduced. Further, in the hot water supply and heating system after the reduction process is executed, it takes a long time to store heat in the tank. Therefore, it is preferable to return the operation of the hot water supply and heating system to the normal operation. Therefore, in this case, the control device executes an increase process. According to this configuration, the amount of heat used for heating the hot water supply heat medium is increased by increasing the flow rate of the hot water supply heat medium heated by the heat pump while the hot water supply heating operation and the heating heating operation are performed simultaneously. The amount of heat used for heating the heating medium is relatively decreased. Moreover, the operation of the hot water supply / heating system can be returned to the normal operation.

  Further, in the hot water supply and heating system, the temperature detection unit is configured in a state where the hot water supply heating operation and the heating heating operation are simultaneously performed after the reduction process is performed and the auxiliary heating operation is not performed. When the temperature of the heating medium detected by the above is equal to or higher than the predetermined second reference temperature over a predetermined second reference time, the control device may execute the increase process.

  According to this configuration, there is a delay of the predetermined second reference time when the control device determines whether or not the temperature of the heating medium is equal to or higher than the predetermined second reference temperature. Even if the temperature of the heating medium suddenly changes, the increase process is not executed if the temperature changes within the grace period (second reference time). Therefore, even if the temperature of the heating medium is suddenly changed, the flow rate of the hot water heating medium is not increased thereby, and the flow rate of the hot water heating medium can be appropriately managed. Thereby, the temperature of the heating medium can be appropriately managed.

It is a figure which shows typically the structure of the hot water supply heating system 2 which concerns on an Example. It is a flowchart explaining the ignition / extinguishing process of the heating burner 82 according to the embodiment. It is a figure explaining the temperature of the water for heating detected by the thermistor 89 which concerns on an Example. It is a flowchart explaining the 1st increase / decrease process of the flow volume of the hot water supply water which concerns on an Example. It is a flowchart explaining the 2nd increase / decrease process of the flow volume of the hot water supply water which concerns on an Example. It is the Mollier diagram of the refrigerant | coolant in the heat pump 50 which concerns on an Example (It is a figure before the reduction | decrease in the flow volume of hot water supply water.). It is the Mollier diagram of the refrigerant | coolant in the heat pump 50 which concerns on an Example (It is a figure after reduction of the flow volume of the hot water supply water.). It is a flowchart explaining the 2nd increase / decrease process of the flow volume of the hot water supply water which concerns on another Example.

  Hereinafter, the hot water supply heating system 2 which concerns on an Example is demonstrated. As shown in FIG. 1, a hot water supply / heating system 2 according to the present embodiment includes a tank unit 4 (an example of a hot water supply device), a heat pump unit 6, a heat source unit 8, and a control device 100.

  The heat pump unit 6 includes a heat pump 50 and a hot water circulation pump 22 (an example of a flow rate adjusting unit). The heat pump 50 includes a refrigerant circulation path 52 for circulating a refrigerant (for example, an HFC refrigerant such as R410A and a CO2 refrigerant such as R744), an air heat exchanger 54 (an example of an evaporator), a fan 56, and a compressor 62. , A three-fluid heat exchanger 58 (an example of a condenser), an expansion valve 60 (an example of a pressure reducing mechanism), a refrigerant bypass path 64, and an on-off valve 66.

  The air heat exchanger 54 exchanges heat between outside air (an example of a natural environment) 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 and 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 is vaporized by being heated, and is in a gas state at a relatively high temperature and a low pressure.

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

  The refrigerant circulation path 52 of the three-fluid heat exchanger 58 is supplied with the high-temperature and high-pressure gaseous refrigerant sent from the compressor 62. The three-fluid heat exchanger 58 can perform heat exchange between the refrigerant in the refrigerant circuit 52 and water in the tank water circuit 20 described later (hereinafter also referred to as hot water supply water). Further, the three-fluid heat exchanger 58 can perform heat exchange between the refrigerant in the refrigerant circulation path 52 and water in a second heating heating path 88 described later (hereinafter also referred to as heating water). As a result of heat exchange in the three-fluid heat exchanger 58, the refrigerant is deprived of heat and condensed. Thereby, a refrigerant | coolant will be in a high-pressure liquid state with a comparatively low temperature.

  The expansion valve 60 is supplied with a relatively low-temperature and high-pressure liquid refrigerant 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 and low-pressure liquid state. The refrigerant that has passed through the expansion valve 60 is sent to the air heat exchanger 54 as described above.

  The refrigerant bypass path 64 has one end connected to the upstream side of the expansion valve 60 and the other end connected to the downstream side of the expansion valve 60. An open / close valve 66 is provided in the refrigerant bypass passage 64.

  When the compressor 62 is operated in the heat pump 50 with the on-off valve 66 closed, the refrigerant in the refrigerant circulation path 52 is converted into the air heat exchanger 54, the compressor 62, the three-fluid heat exchanger 58, and the expansion valve 60. It circulates in the order. In this case, in the three-fluid heat exchanger 58, the hot water supply water in the tank water circulation path 20 and / or the heating water in the second heating heating path 88 is heated.

  The three-fluid heat exchanger 58 includes a refrigerant inlet 521, a refrigerant outlet 522, a hot water inlet 201, a hot water outlet 202, a heating water inlet 881, and a heating water outlet 882. . The refrigerant in the gaseous state flows into the three-fluid heat exchanger 58 from the inlet 521 of the refrigerant, and the liquid refrigerant flows out from the outlet 522 of the refrigerant. In addition, hot water supply water flows into the three-fluid heat exchanger 58 from the hot water supply water inlet 201, and hot water supply water flows out of the hot water supply water outlet 202. Further, the heating water flows into the three-fluid heat exchanger 58 from the heating water inlet 881 and the heating water flows out from the heating water outlet 882. The refrigerant inlet 521 side of the three-fluid heat exchanger 58 corresponds to the hot water outlet 202 side and the heating water outlet 882 side. The refrigerant outlet 522 side of the three-fluid heat exchanger 58 corresponds to the hot water supply water inlet 201 side and the heating water inlet 881 side. That is, in the three-fluid heat exchanger 58, the refrigerant and the hot water supply water flow as counterflows, and the refrigerant and the heating water flow as counterflows.

  The tank unit 4 includes a tank 10. The tank 10 stores hot water supplied by the heat pump 50. The hot water supply water in this embodiment is tap water. The tank 10 is a hermetically sealed type, and the outside is covered with a heat insulating material. Water for hot water supply is stored in the tank 10 until it is full. The thermistors 12, 14, 16 and 18 are attached to the tank 10 at substantially equal intervals in the height direction of the tank 10. For example, the thermistors 12, 14, 16, and 18 are attached to positions 10 L, 30 L, 50 L, and 70 L from the top of the tank 10, respectively. Each thermistor 12, 14, 16, 18 measures the temperature of the hot water 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. Each thermistor 12, 14, 16, 18 is an example of a heat storage amount detection unit that detects a heat storage amount of hot water for water stored in the tank 10. The amount of heat stored in the tank 10 corresponds to the amount of hot water stored in the tank 10.

  The tank water circulation path 20 has an upstream end connected to the lower part of the tank 10, passes through the three-fluid heat exchanger 58 of the heat pump unit 6, and a downstream end connected to the upper part of the tank 10. A water circulation pump 22 for hot water supply of the heat pump unit 6 is interposed in the tank water circulation path 20. In the heat pump unit 6, when the heat pump 50 is operated 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 and heated, and the heated hot water supply water is supplied to the tank 10. Return to the top of the. Inside the tank 10, a temperature stratification is formed in which a layer of hot water supply water is stacked on a layer of low temperature hot water supply water. A thermistor 21 is attached downstream of the three-fluid heat exchanger 58 in the tank water circulation path 20. The thermistor 21 detects the temperature of hot water supplied from the heat pump 50 to the tank 10.

  The upstream end of the tap water introduction path 24 is connected to a tap water supply source 32 outside the hot water supply / 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 24 a is connected to the lower part of the tank 10. The downstream end of the second introduction path 24 b 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.

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

  The heat source unit 8 includes a cistern 70, a heating burner 82 (an example of an auxiliary heat source unit), and a hot water supply burner 81. The cistern 70 is a container having an open top and stores heating water therein. The heating water in this embodiment is, for example, an antifreeze liquid. The upstream end of the heating forward path 72 is connected to the systern 70. A heating water circulation pump 74 is interposed in the heating forward path 72. When the heating water circulation pump 74 is driven, the heating water in the systern 70 flows into the heating forward path 72.

  The downstream end of the heating forward 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 circuit 75. The low temperature heater 78 of the present embodiment is, for example, a floor heater. The low temperature heater 78 heats using 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 branches into a high temperature heating circulation path 77 and a reheating circulation path 79. A high temperature heater 76 (an example of a heating device) is attached to the high temperature heating circuit 77. The high temperature heater 76 of the present embodiment is, for example, a bathroom heater / dryer. The high temperature heater 76 heats using the heat of the supplied heating water. The low temperature heating circuit 75 and the high temperature heating circuit 77 merge at their 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 branches into a second heating heating path 88 and an HP bypass path 94 in the tank unit 4. A heating water adjustment valve 90 is provided at the downstream end of the first heating return path 84. The heating water regulating valve 90 changes the opening degree, thereby changing the flow rate of the heating water flowing from the first heating return path 84 to the second heating heating path 88 and the heating water flowing from the first heating return path 84 to the HP bypass path 94. The flow rate ratio can be changed. For example, a three-way valve is used as the heating water adjustment valve 90 of the present embodiment. The second heating heating path 88 passes through the three-fluid heat exchanger 58 of the heat pump unit 6 and is connected to the upstream end of the second heating return path 96. A thermistor 89 (an example of temperature detection means) is attached to the second heating heating path 88 downstream of the three-fluid heat exchanger 58. The thermistor 89 detects the temperature of the heating water that has passed through the three-fluid heat exchanger 58. The HP bypass 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 heat pump unit 6. The downstream end of the second heating return path 96 is connected to the cistern 70 of the heat source 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 exchange is performed between the heating water flowing in the reheating circulation path 79 and the bathtub water flowing in the bathtub water circulation path 91. A 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 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 out from the bottom of the bathtub 98 passes through the reheating heat exchanger 97 and is returned to the side of the bathtub 98.

  A hot water supply burner 81 is interposed in the hot water supply heating path 37. From the downstream side of the hot water supply burner 81 of the hot water supply heating path 37, the bathtub pouring path 40 is branched. The bathtub pouring passage 40 is provided with a pouring solenoid valve 42 for opening and closing the bathtub pouring passage 40. The downstream end of the bathtub pouring channel 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 heat pump unit 6, and the heat source unit 8.

(Operation of hot water heating system)
Next, the operation of the hot water supply / heating system 2 of the present embodiment will be described. Below, the hot-water supply heating operation, the hot-water supply operation, and the heating-heating operation which the hot-water supply heating system 2 implements are demonstrated in order.

(Hot water heating operation)
In the hot water supply heating operation, the hot water supply water in the tank 10 is heated by the heat pump 50, and the hot water supply water that has reached a high temperature 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. At this time, the heat pump 50 drives the compressor 62 with the on-off valve 66 closed.

  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 circuit 52 passing through the three-fluid heat exchanger 58 is in a high-temperature and high-pressure gas state. Further, the hot water supply water circulating pump 20 drives the hot water supply water in the tank 10 to circulate in the tank water circulation path 20. That is, hot water supply water existing in the lower part of the tank 10 is introduced into the tank water circulation path 20 and heated by the heat of the refrigerant in the refrigerant circulation path 52 when the introduced hot water supply water passes through the three-fluid heat exchanger 58. Then, the heated hot water supply water is returned to the upper part of the tank 10. At this time, the operation of the heat pump 50 is controlled so that the temperature of the hot water supply water detected by the thermistor 21 becomes the boiling set temperature. The boiling setting temperature in the hot water supply heating operation is 47 ° C., for example. The hot water supply water is heated so that the temperature of the hot water supply water detected by the thermistor 21 becomes a boiling set temperature (for example, 47 ° C.). Thereby, hot water for hot water supply is stored in the tank 10. When the inside of the tank 10 is in a fully stored state filled with high-temperature hot water supply water, the hot water supply heating operation is terminated.

(Hot water operation)
The hot water supply operation is an operation of supplying hot water in the tank 10 to the hot water tap 38. The hot water supply operation can be performed in parallel with the hot water supply heating operation. 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 tap 38 via the first hot water supply path 36.

  When the temperature of the hot water supplied from the tank 10 to the first hot water supply path 36 is higher than the set hot water temperature, the control device 100 drives the mixing valve 30 to connect the first hot water supply path 36 from the second introduction path 24b. Introduce tap water. Therefore, the hot water supply water supplied from the tank 10 and the tap water supplied from the second introduction path 24 b are mixed in the first hot water supply path 36. The control device 100 adjusts the opening of the mixing valve 30 so that the temperature of the hot water supplied to the hot water tap 38 coincides with the hot water set temperature. On the other hand, when the temperature of the hot water supplied from the tank 10 to the first hot water supply path 36 is lower than the set hot water temperature, the control device 100 heats the hot water supplied through the hot water heating path 37 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 tap 38 matches the hot water supply set temperature.

(Heating / heating operation)
The heating and heating operation is an operation in which heating water is heated by the heat pump 50 and heated by the low-temperature heater 78 or the high-temperature heater 76 using the heating water having a high temperature. When the execution of the heating heating operation is instructed by the user, the control device 100 adjusts the opening degree of the heating water adjustment valve 90 according to the load of the low temperature heater 78 or the high temperature heater 76, and the heating water circulation pump 74. Rotate. Further, the control device 100 drives the compressor 62 and the fan 56 with the on-off valve 66 closed. 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 cistern 70. Furthermore, the control apparatus 100 operates the heating burner 82 as necessary. As a result, the high-temperature heater 76 is supplied with heating water that has been heated to a higher temperature by the heating by the heating burner 82. In the heating operation, so that 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, The opening degree of the heating water adjustment valve 90, the operation of the heat pump 50, and the output of the heating burner 82 are adjusted.

(Simultaneous execution of hot water heating operation and heating heating operation)
In the hot water supply and heating system 2, when the hot water supply heating operation and the heating heating operation are performed simultaneously, the three-fluid heat exchanger 58 of the heat pump 50 simultaneously performs the heating of the hot water supply water and the heating water.

  In the hot water supply and heating system 2, when the hot water supply heating operation and the heating heating operation are performed simultaneously, the control device 100 performs an ignition / extinguishing process of the heating burner 82. Moreover, the control apparatus 100 performs the increase / decrease process of the hot water supply water which flows through the tank water circulation path 20. FIG. These processes will be described below.

(Ignition / extinguishing treatment of heating burner 82)
The ignition / extinguishing process of the heating burner 82 will be described. As shown in FIG. 2, in step S101 of this process, the control device 100 monitors the temperature of the heating water detected by the thermistor 89, and the detected temperature of the heating water is a predetermined ignition reference temperature (see FIG. 3). ) Determine whether or not: The ignition reference temperature in step S101 is 36 ° C., for example. When the temperature of the heating water is equal to or lower than the ignition reference temperature (36 ° C.), the control device 100 determines YES in step S101 and proceeds to step S102. On the other hand, when the temperature of the heating water is not equal to or lower than the ignition reference temperature (36 ° C.), the control device 100 determines NO and continues to monitor the temperature.

  Subsequently, in step S102, the control device 100 ignites the heating burner 82 interposed in the first heating heating path 73. When the heating burner 82 is ignited, the heating water in the first heating heating path 73 is auxiliary-heated and the temperature of the heating water rises.

  As shown in FIG. 3, the temperature of the heating water detected by the thermistor 89 varies depending on the heating condition of the heating water. When the heating water is heated, the temperature increases, and when the heating water is not heated, the temperature decreases.

  As shown in FIG. 2, subsequently, in step S103, the control device 100 again monitors the temperature of the heating water detected by the thermistor 89, and the detected temperature of the heating water is a predetermined fire extinguishing reference temperature (see FIG. 3). ) Determine whether it is above. The fire extinguishing reference temperature in step S103 is 45 ° C., for example. When the temperature of the heating water is equal to or higher than the fire extinguishing reference temperature (45 ° C.), the control device 100 determines YES in step S103 and proceeds to step S104. On the other hand, when the temperature of the heating water is not equal to or higher than the fire extinguishing reference temperature (45 ° C.), the control device 100 determines NO and continues to monitor the temperature.

  Subsequently, in step S <b> 104, the control device 100 extinguishes the heating burner 82 interposed in the first heating heating path 73. When the heating burner 82 is extinguished, the heating water in the first heating heating path 73 is not supplementally heated. When the process of step S104 ends, the process returns to step S101 again.

(First increase / decrease process of hot water supply water)
Next, the 1st increase / decrease process of the hot water supply water is demonstrated. As shown in FIG. 4, in step S111 of this process, the control device 100 determines whether or not the heating burner 82 is ignited. If the heating burner 82 is ignited, the control device 100 determines YES in step S111 and proceeds to step S112. On the other hand, when the heating burner 82 is not ignited, the control device 100 determines NO and proceeds to step S121.

  Subsequently, in step S112, the control device 100 determines whether or not the amount of hot water stored in the tank 10 is greater than or equal to a predetermined amount of hot water stored (for example, 30L). The control device 100 specifies the amount of hot water stored in the tank 10 based on the detected temperature of each thermistor 12, 14, 16, 18 attached to the tank 10. If the amount of hot water stored in the tank 10 is greater than or equal to a predetermined amount of hot water stored (for example, 30 L), the control device 100 determines YES in step S112 and proceeds to step S113. On the other hand, if the amount of hot water stored in the tank 10 is not equal to or greater than the predetermined amount of hot water, the control device 100 determines NO and proceeds to step S121.

  The amount of hot water stored in the tank 10 corresponds to the amount of heat stored in the hot water supply water stored in the tank 10. When the amount of stored heat is large, the amount of stored hot water is large, and when the amount of stored heat is small, the amount of stored hot water is small. Therefore, in step S112, the control device 100 determines whether or not the heat storage amount of the tank 10 is equal to or greater than a predetermined heat storage amount (for example, a first reference heat storage amount corresponding to a 30 L hot water storage amount) by determining the hot water storage amount. can do. If the heat storage amount is equal to or greater than the predetermined heat storage amount (first reference heat storage amount), the control device 100 determines YES in step S112 and proceeds to step S113. On the other hand, when the heat storage amount is less than the predetermined heat storage amount (first reference heat storage amount), the control device 100 determines NO and proceeds to step S121.

  Subsequently, in step S113, the control device 100 sets the target temperature of the heating water to a high temperature target temperature (for example, 45 ° C.). The high temperature target temperature (for example, 45 ° C.) is higher than the normal target temperature (for example, 40 ° C.) described later. The target temperature of the hot water supply water is the above-described boiling setting temperature (for example, 47 ° C.). The high temperature target temperature (for example, 45 ° C.) of the heating water is a temperature that is lower than the set temperature for boiling water (for example, 47 ° C.).

  Subsequently, in step S <b> 114, the control device 100 executes a reduction process for reducing the flow rate of the hot water supply water circulating between the tank 10 and the heat pump 50. Specifically, the control device 100 decreases the number of rotations of the hot water supply water circulation pump 22. The control device 100 decreases the flow rate of the hot water supply water from, for example, 1.0 L / min to 0.2 L / min.

  In step S115 performed after step S114, the controller 100 determines that the temperature of the heating water detected by the thermistor 89 becomes the high temperature target temperature (for example, 45 ° C.) set in step S113, and the hot water supply water detected by the thermistor 21. The operation of the heat pump 50 is controlled so that the temperature becomes the boiling setting temperature (for example, 47 ° C.). Specifically, the control device 100 adjusts the opening degree of the expansion valve 60 in the heat pump 50 and / or adjusts the rotational speed of the compressor 62. As a result, the temperature of the water for heating after being heated by the three-fluid heat exchanger 58 rises.

  On the other hand, in step S121 after NO is determined in step S111 or S112, the control device 100 sets the target temperature of the heating water to a normal target temperature (for example, 40 ° C.). The normal target temperature (for example, 40 ° C.) is a temperature lower than the above-described high temperature target temperature (for example, 45 ° C.).

  Subsequently, in step S122, the control device 100 sets the flow rate of the hot water supply water circulating between the tank 10 and the heat pump 50 to a normal flow rate. When the flow rate of hot water supply water is already a normal flow rate, control device 100 maintains the flow rate. On the other hand, when the flow rate of hot water supply water is decreasing (see step S114 above), control device 100 executes an increase process for increasing the flow rate of hot water supply water. Specifically, the control device 100 increases the number of rotations of the hot water supply water circulation pump 22. The control device 100 increases the flow rate of the hot water supply water from, for example, 0.2 L / min to 1.0 L / min. The control device 100 increases the flow rate of the hot water supply water and returns it to the normal flow rate. In step S122, the reduction process for decreasing the flow rate of hot water supply water is prohibited.

  In step S115 performed after step S122, the control device 100 determines that the temperature of the heating water detected by the thermistor 89 becomes the normal target temperature (for example, 40 ° C.) set in S121, and the hot water supply water detected by the thermistor 21. The operation of the heat pump 50 is controlled so that the temperature becomes the boiling set temperature (for example, 47 ° C.). Specifically, the control device 100 adjusts the opening degree of the expansion valve 60 in the heat pump 50 and / or adjusts the rotational speed of the compressor 62. Thereby, the temperature of the water for heating after heating with the three-fluid heat exchanger 58 falls.

(Second increase / decrease process of hot water supply water)
Next, the second increase / decrease process of hot water supply water will be described. In this process, the heating burner 82 is always extinguished (not ignited). As shown in FIG. 5, in step S131 of this process, the control device 100 monitors the temperature of the heating water detected by the thermistor 89, and the detected temperature of the heating water is a predetermined first reference temperature (for example, 40). ° C) or less. When the temperature of the water for heating is below 1st reference temperature (for example, 40 degreeC), the control apparatus 100 judges YES in step S131, and progresses to step S132. On the other hand, when the temperature of the heating water is not equal to or lower than the first reference temperature, the control device 100 determines NO and proceeds to step S141.

  In step S131, control device 100 may determine whether the temperature of the heating water is equal to or lower than a predetermined first reference temperature over a predetermined first reference time. The first reference time in step S131 is, for example, 1 minute. When the temperature of the heating water is equal to or lower than the first reference temperature (40 ° C.) over the first reference time (1 minute), the control device 100 determines YES in step S131 and proceeds to step S132. Otherwise, the control device 100 determines NO and proceeds to step S141.

  Subsequently, in step S132, the control device 100 determines whether or not the amount of hot water stored in the tank 10 is equal to or greater than a predetermined hot water storage amount (for example, 30 L). The control device 100 specifies the amount of hot water stored in the tank 10 based on the detected temperature of each thermistor 12, 14, 16, 18 attached to the tank 10. If the amount of hot water stored in the tank 10 is greater than or equal to a predetermined amount of hot water stored (for example, 30 L), the control device 100 determines YES in step S132 and proceeds to step S133. On the other hand, if the amount of hot water stored in the tank 10 is not equal to or greater than the predetermined amount of hot water stored, the control device 100 determines NO and proceeds to step S141.

  The amount of hot water stored in the tank 10 corresponds to the amount of heat stored in the hot water supply water stored in the tank 10. When the amount of stored heat is large, the amount of stored hot water is large, and when the amount of stored heat is small, the amount of stored hot water is small. Therefore, in step S132, the control device 100 determines whether or not the heat storage amount of the tank 10 is equal to or greater than a predetermined heat storage amount (for example, a second reference heat storage amount corresponding to a 30 L hot water storage amount) by determining the hot water storage amount. can do. If the heat storage amount is greater than or equal to the predetermined heat storage amount (second reference heat storage amount), the control device 100 determines YES in step S132 and proceeds to step S133. On the other hand, when the heat storage amount is less than the predetermined heat storage amount (second reference heat storage amount), the control device 100 determines NO and proceeds to step S141.

  Subsequently, in step S133, the control device 100 sets the target temperature of the heating water to a high temperature target temperature (for example, 45 ° C.). The high temperature target temperature (for example, 45 ° C.) is higher than the normal target temperature (for example, 40 ° C.) described later. The target temperature of the hot water supply water is the above-described boiling setting temperature (for example, 47 ° C.). The high temperature target temperature (for example, 45 ° C.) of the heating water is a temperature that is lower than the set temperature for boiling water (for example, 47 ° C.).

  Subsequently, in step S134, the control device 100 executes a reduction process for reducing the flow rate of the hot water supply water circulating between the tank 10 and the heat pump 50. Specifically, the control device 100 decreases the number of rotations of the hot water supply water circulation pump 22. The control device 100 decreases the flow rate of the hot water supply water from, for example, 1.0 L / min to 0.2 L / min.

  In step S135 performed after step S134, the controller 100 determines that the temperature of the heating water detected by the thermistor 89 becomes the high temperature target temperature (for example, 45 ° C.) set in step S133, and the hot water supply water detected by the thermistor 21. The operation of the heat pump 50 is controlled so that the temperature becomes the boiling setting temperature (for example, 47 ° C.). Specifically, the control device 100 adjusts the opening degree of the expansion valve 60 in the heat pump 50 and / or adjusts the rotational speed of the compressor 62. As a result, the temperature of the water for heating after being heated by the three-fluid heat exchanger 58 rises.

  On the other hand, in step S141 after NO is determined in step S131 or S132, the control device 100 sets the target temperature of the heating water to a normal target temperature (for example, 40 ° C.). The normal target temperature (for example, 40 ° C.) is a temperature lower than the above-described high temperature target temperature (for example, 45 ° C.).

  Subsequently, in step S142, the control device 100 sets the flow rate of the hot water supply water circulating between the tank 10 and the heat pump 50 to a normal flow rate. When the flow rate of hot water supply water is already a normal flow rate, control device 100 maintains the flow rate. On the other hand, when the flow rate of hot water supply water is decreasing (see step S134 above), control device 100 executes an increase process for increasing the flow rate of hot water supply water. Specifically, the control device 100 increases the number of rotations of the hot water supply water circulation pump 22. The control device 100 increases the flow rate of the hot water supply water from, for example, 0.2 L / min to 1.0 L / min. The control device 100 increases the flow rate of the hot water supply water and returns it to the normal flow rate. In step S142, the reduction process for decreasing the flow rate of hot water supply water is prohibited.

  In step S135 performed after step S142, the control device 100 determines that the temperature of the heating water detected by the thermistor 89 becomes the normal target temperature (eg, 40 ° C.) set in S141, and the hot water supply water detected by the thermistor 21. The operation of the heat pump 50 is controlled so that the temperature becomes the boiling set temperature (for example, 47 ° C.). Specifically, the control device 100 adjusts the opening degree of the expansion valve 60 in the heat pump 50 and / or adjusts the rotational speed of the compressor 62. Thereby, the temperature of the water for heating after heating with the three-fluid heat exchanger 58 falls.

  The hot water supply / heating system 2 according to the embodiment has been described above. As apparent from the above description, the hot water supply / heating system 2 includes the heat pump 50, the heating burner 82, and the tank 10. The heat pump 50 includes a compressor 62 that pressurizes the refrigerant, a three-fluid heat exchanger 58 that condenses the refrigerant by exchanging heat between the refrigerant and the water for hot water, and exchanging heat between the refrigerant and the water for heating, An expansion valve 60 that decompresses the refrigerant and an air heat exchanger 54 that evaporates the refrigerant by exchanging heat between the refrigerant and the natural environment are provided. The heating burner 82 heats the heating water by the combustion of fuel. The tank 10 stores hot water supplied by the heat pump 50. The hot water supply / heating system 2 circulates between the tank unit 4 that supplies hot water using hot water supply water, the high-temperature heater 76 and the low-temperature heater 78 that heat using hot water, and the tank 10 and the heat pump 50. A hot water supply water circulation pump 22 that adjusts the flow rate of hot water supply water and a control device 100 are provided. In this hot water supply and heating system 2, a hot water supply heating operation in which hot water supply water is heated by the heat pump 50, a heating heating operation in which heating water is heated by the heat pump 50, and an auxiliary heating operation in which heating water is heated by the heating burner 82 can be executed. is there. When the hot water supply heating operation and the heating heating operation are performed at the same time and the auxiliary heating operation is performed, the control device 100 reduces the number of rotations of the hot water supply water circulation pump 22 between the tank 10 and the heat pump 50. A reduction process for reducing the flow rate of the circulating hot water supply water is executed (see step S114).

  According to this configuration, when the hot water and the heating water are simultaneously heated by the heat pump 50 and the heating water is heated by the heating burner 82, the temperature of the heating water is increased without decreasing the temperature of the hot water. Can do. This mechanism will be described later. In the hot water supply and heating system 2 described above, the reduction process in which the control device 100 decreases the flow rate of the hot water supply water includes a process of stopping the circulation of the hot water supply water so that the flow rate of the hot water supply water becomes zero.

  The hot water supply / heating system 2 further includes thermistors 12, 14, 16, and 18 that detect the heat storage amount of hot water supply water stored in the tank 10. When the heat storage amount detected by the thermistors 12, 14, 16, 18 is less than a predetermined first reference heat storage amount (for example, a heat storage amount corresponding to a 30 L hot water storage amount), the control device 100 prohibits the reduction process ( Steps S112 and S122).

  When the heat storage amount of the tank 10 is less than the predetermined first reference heat storage amount, it is desirable to quickly increase the heat storage amount. In this case, it is not desirable to reduce the flow rate of hot water supplied by the heat pump 50. Therefore, in this case, the control device 100 prohibits the reduction process. According to this configuration, it is possible to maintain the flow rate of hot water supplied by the heat pump 50, to heat as much hot water as the flow rate of hot water does not decrease, and to quickly increase the amount of heat stored in the tank 10. Can be increased.

  Further, in the hot water supply and heating system 2 described above, when the hot water supply heating operation and the heating heating operation are simultaneously performed after the reduction process is performed, and the auxiliary heating operation is not performed, the control device 100 performs the hot water supply water supply. Increasing processing for increasing the flow rate of hot water for circulating between the tank 10 and the heat pump 50 by increasing the number of rotations of the circulation pump 22 is executed (see steps S134 and S142).

  After the reduction process is performed, when the hot water heating operation and the heating heating operation are performed at the same time, and the auxiliary heating operation is not performed, it is considered that the temperature of the heating water is sufficiently high, The amount of heat used for heating the heating water may be reduced. Moreover, in the hot water supply and heating system 2 after the reduction process is executed, it takes a long time to store heat in the tank 10, and therefore it is preferable to return the operation of the hot water supply and heating system 2 to a normal operation. Therefore, in this case, the control device 100 executes an increase process. According to this configuration, since the flow rate of hot water supplied by the heat pump 50 is increased while the hot water supply heating operation and the heating heating operation are performed simultaneously, the amount of heat used for heating the hot water supply is relatively increased. However, the amount of heat used for heating water for heating is relatively reduced. Further, the operation of the hot water supply / heating system 2 can be returned to the normal operation.

  In the hot water supply and heating system 2 described above, when the hot water supply heating operation and the heating heating operation are performed simultaneously, the control device 100 reduces the number of rotations of the hot water supply water circulation pump 22 to circulate between the tank 10 and the heat pump 50. When the reduction process for reducing the flow rate of the water is performed, the temperature of the heating water flowing out from the three-fluid heat exchanger 58 rises without changing the temperature of the hot water flowing out from the three-fluid heat exchanger 58. This mechanism will be described with reference to the drawings.

  6 and 7 are Mollier diagrams of the refrigerant in the heat pump 50. FIG. 6 and 7, the vertical axis represents the refrigerant temperature (° C.), and the horizontal axis represents the refrigerant specific enthalpy (kJ / kg). In FIGS. 6 and 7, between A and B is a refrigerant pressurizing process, between B and C is a refrigerant condensing process, between C and D is a refrigerant depressurizing process, and between D and A. Is the refrigerant evaporation process. Moreover, among the condensation processes of the refrigerant | coolant between BC, especially between J-C has shown the supercooling area | region of the refrigerant | coolant. FIG. 6 is a diagram of a state before the flow rate of hot water for water circulating between the tank 10 and the heat pump 50 is reduced. FIG. 7 is a diagram of a state after the flow rate of hot water for water circulating between the tank 10 and the heat pump 50 is reduced.

  6 and 7 indicate the state of the refrigerant at the refrigerant outlet 522 of the three-fluid heat exchanger 58 after the refrigerant condensation process is completed. Comparing points C in FIG. 6 and FIG. 7, the temperature of the refrigerant after the decrease in the flow rate of hot water supply (FIG. 7) is higher than the temperature of the refrigerant before the decrease in the flow rate of hot water supply (FIG. 6). . Before the decrease in the flow rate of hot water supply water (FIG. 6), the refrigerant temperature (point C) at the refrigerant outlet 522 is 20 ° C. After the decrease in the flow rate of the hot water supply water (FIG. 7), the refrigerant temperature (point C) at the refrigerant outlet 522 is 30 ° C. The refrigerant at this time is in a supercooled liquid state. As apparent from FIGS. 6 and 7, after the flow rate of hot water supply water is decreased, the amount of heat of the refrigerant taken away by the hot water supply water is smaller than before the decrease, so that the refrigerant supercooling region (region between JC) ) Becomes shorter, and the temperature of the refrigerant at the refrigerant outlet 522 of the three-fluid heat exchanger 58 becomes higher. Note that the temperature (point B) of the refrigerant at the refrigerant inlet 521 does not change at 80 ° C. either after the flow rate of hot water supply water is decreased or before the decrease. The refrigerant at this time is in the state of superheated steam. The condensation temperature (point J) of the refrigerant is 43 ° C.

  6 and 7 indicate the temperature of the heating water at the heating water inlet 881 of the three-fluid heat exchanger 58. 6 and 7, the temperature (point E) of the heating water at the heating water inlet 881 is 34 ° C. Since the heating water is warm water circulating for heating, the temperature of the heating water at the heating water inlet 881 (point E) is higher than the temperature of the hot water supply water at the hot water inlet 201 (point G). It is. Lines L1 in FIGS. 6 and 7 indicate the temperature of the heating water in the process in which the heating water passes through the three-fluid heat exchanger 58 (that is, the refrigerant condensation process). 6 and 7 indicate the temperature of the heating water at the heating water outlet 882 of the three-fluid heat exchanger 58. Heating water is heated by heat exchange with the refrigerant in the process of passing through the three-fluid heat exchanger 58. On the other hand, the refrigerant condenses.

  As shown in FIGS. 6 and 7, the temperature (point E) of the heating water at the heating water inlet 881 of the three-fluid heat exchanger 58 is higher than the temperature of the refrigerant (point C) at the refrigerant outlet 522. . As shown in FIG. 1, the heating water inlet 881 side of the three-fluid heat exchanger 58 corresponds to the refrigerant outlet 522 side. Therefore, on the heating water inlet 881 side (the refrigerant outlet 522 side) of the three-fluid heat exchanger 58, the heat of the high-temperature heating water moves to the low-temperature refrigerant. As a result, the temperature of the water for heating falls temporarily like the L1 line of FIG. 6 and FIG.

  Comparing the L1 lines in FIG. 6 and FIG. 7, the decrease in the temperature of the heating water is relatively smaller after the decrease in the flow rate of hot water supply (FIG. 7) than in the decrease in the flow rate of hot water supply (FIG. 6). ing. As described above, after the decrease in the flow rate of hot water supply water (FIG. 7), the refrigerant supercooling region (region between JC) becomes shorter than before the decrease in the flow rate of hot water supply water (FIG. 6). The refrigerant temperature (point C) at the refrigerant outlet 522 of the fluid heat exchanger 58 increases. Therefore, as shown by the L1 line, the heat transfer from the heating water to the refrigerant is smaller after the decrease in the flow rate of the hot water supply water (FIG. 7) than before the decrease in the flow rate of the hot water supply water (FIG. 6). The temperature drop of water is relatively small.

  The heating water is heated by heat exchange with the refrigerant in the process of passing through the three-fluid heat exchanger 58. As a result, the temperature of the heating water rises. Comparing point F in FIG. 6 and FIG. 7, the outlet of the heating water of the three-fluid heat exchanger 58 after the decrease in the flow rate of the hot water supply water (FIG. 7) is greater than that before the decrease in the flow rate of the hot water supply water (FIG. 6). The temperature of the water for heating in 882 is high. As described above, after the flow rate of hot water supply water is decreased (FIG. 7), the heating water inlet 881 side (refrigerant outlet 522) of the three-fluid heat exchanger 58 is more than before the flow rate of hot water supply water is decreased (FIG. 6). Side), the temperature of the heating water at the outlet 882 of the heating fluid of the three-fluid heat exchanger 58 becomes relatively high. Before the decrease in the flow rate of hot water supply water (FIG. 6), the temperature (F point) of the heating water at the heating water outlet 882 is 40 ° C. After the decrease in the flow rate of hot water supply water (FIG. 7), the temperature (F point) of the heating water at the outlet 882 for heating water is 45 ° C.

  Next, the temperature of the hot water supply water will be described. 6 and 7 indicate the temperature of the hot water supply water at the hot water supply water inlet 201 of the three-fluid heat exchanger 58. Since the hot water supply water is cold water supplied from the lower part of the tank 10, the temperature of hot water supply water (point G) at the hot water supply inlet 201 is lower than the temperature of the heating water (point E) at the heating water inlet 881. It is. Lines L2 in FIGS. 6 and 7 indicate the temperature of the hot water supply water in the process in which the hot water supply water passes through the three-fluid heat exchanger 58 (that is, the refrigerant condensation process). 6 and 7 indicate the temperature of the hot water at the hot water outlet 202 of the three-fluid heat exchanger 58. The hot water supply water is heated by heat exchange with the refrigerant in the process of passing through the three-fluid heat exchanger 58. Hot water supply water and heating water are simultaneously heated by the three-fluid heat exchanger 58. The temperature of hot water supply water (G point) at the hot water supply water inlet 201 is 9 ° C. The temperature (H point) of the hot water supply water at the hot water supply water outlet 202 is 47 ° C.

  As shown in FIGS. 6 and 7, the temperature (point G) of hot water at the hot water inlet 201 of the three-fluid heat exchanger 58 is lower than the temperature (point C) of the refrigerant at the refrigerant outlet 522. . Moreover, as shown in FIG. 1, the hot water supply water inlet 201 side of the three-fluid heat exchanger 58 corresponds to the refrigerant outlet 522 side. Therefore, at the hot water supply water inlet 201 side (refrigerant outlet 522 side) of the three-fluid heat exchanger 58, the heat of the high-temperature refrigerant moves to the low-temperature hot water supply water. As a result, unlike the L2 line in FIGS. 6 and 7, the temperature of the hot water supply water does not temporarily decrease unlike the temperature of the heating water.

  The hot water supply water is heated by heat exchange with the refrigerant in the process of passing through the three-fluid heat exchanger 58. As a result, the temperature of the hot water supply water rises. The temperature of the hot water supply water always rises without being temporarily lowered as indicated by the line L2 in FIGS. In the three-fluid heat exchanger 58, since the heat of hot water is not transferred to the refrigerant, the temperature of the hot water is increased without temporarily decreasing. On the hot water supply water outlet 202 side (the refrigerant inlet 521 side) of the three-fluid heat exchanger 58, the temperature of the hot water supply water (point H) is higher than the temperature of the heating water (point F). Moreover, the temperature (point H) of hot water supply water can be made substantially the same before the decrease in the flow rate of hot water supply water (FIG. 6) and after the decrease in the flow rate (FIG. 7). Since the three-fluid heat exchanger 58 does not remove heat from the hot water supply water, the temperature of the hot water supply water (point H) is almost the same before the decrease in the flow rate of the hot water supply (FIG. 6) and after the decrease in the flow rate (FIG. 7). Can be temperature. As described above, the temperature of the heating water (point F) is less after the decrease in the flow rate of the hot water supply water than the decrease in the flow rate of the hot water supply water (FIG. 6). FIG. 7) is higher.

  When the hot water supply heating operation and the heating heating operation are simultaneously executed by the mechanism as described above, the control device 100 decreases the number of rotations of the hot water supply water circulation pump 22 and circulates between the tank 10 and the heat pump 50. When the reduction process for reducing the flow rate of the three-fluid heat exchanger 58 is performed, the temperature of the heating water flowing out of the three-fluid heat exchanger 58 rises without changing the temperature of the hot-water supply water flowing out of the three-fluid heat exchanger 58. Therefore, after the flow rate of the hot water supply water is reduced (FIG. 7), the temperature of the heating water flowing out from the three-fluid heat exchanger 58 (point F) without decreasing the temperature of the hot water water flowing out from the three-fluid heat exchanger 58. ) Can be raised to the fire extinguishing reference temperature (45 ° C). As a result, the heating burner 82 can be extinguished, fuel combustion in the heating burner 82 can be suppressed, and energy efficiency can be increased.

  The hot water supply / heating system 2 includes a thermistor 89 that detects the temperature of the water for heating heated by the heat pump 50. In this hot water supply and heating system 2, the temperature of the heating water detected by the thermistor 89 is a predetermined first reference temperature (with a predetermined first reference temperature) in a state where the hot water heating operation and the heating heating operation are performed simultaneously and the auxiliary heating operation is not performed. When the temperature is equal to or lower than 40 ° C., for example, the control device 100 reduces the number of rotations of the hot water supply water circulation pump 22 to reduce the flow rate of the hot water supply water circulating between the tank 10 and the heat pump 50 ( (See steps S131 and S134).

  According to this configuration, when the controller 100 decreases the flow rate of hot water circulating between the tank 10 and the heat pump 50 by the same mechanism as described above, the temperature of the hot water flowing out from the three-fluid heat exchanger 58 is increased. The temperature of the heating water flowing out from the three-fluid heat exchanger 58 can be increased without lowering. Therefore, after the flow rate of the hot water supply is reduced (FIG. 7), the temperature of the heating water (point F) can be maintained at the ignition reference temperature (36 ° C.) or higher, and the heating burner 82 is extinguished. Can be maintained. As a result, the combustion of fuel in the heating burner 82 can be suppressed and the energy efficiency can be increased.

  Further, in the hot water supply and heating system 2 described above, the temperature of the heating water detected by the thermistor 89 is the predetermined first in a state where the hot water supply heating operation and the heating heating operation are performed simultaneously and the auxiliary heating operation is not performed. When the temperature is equal to or lower than a predetermined first reference temperature (for example, 40 ° C.) over a reference time (for example, 1 minute), the control device 100 may execute a decrease process (see steps S131 and S134).

  According to this configuration, there is a delay of the first reference time when the control device 100 determines whether or not the temperature of the heating water is equal to or lower than the first reference temperature. Therefore, even if the temperature of the heating water changes suddenly in a short time, the reduction process is not executed if the temperature changes within the grace period (first reference time). Therefore, even if the temperature of the heating water suddenly changes, the flow rate of the hot water supply water does not decrease, and the flow rate of the hot water supply water can be appropriately managed. Thereby, the temperature of the water for heating can be managed appropriately.

  The hot water supply / heating system 2 also includes thermistors 12, 14, 16, and 18 that detect the amount of heat stored in the hot water supply water stored in the tank 10. When the heat storage amount detected by the thermistors 12, 14, 16, 18 is less than a predetermined second reference heat storage amount (for example, a heat storage amount corresponding to a 30 L hot water storage amount), the control device 100 prohibits the reduction process. (See steps S132 and S142).

  When the heat storage amount of the tank 10 is less than the predetermined second reference heat storage amount, it is desirable to quickly increase the heat storage amount. In this case, it is not desirable to reduce the flow rate of hot water supplied by the heat pump 50. Therefore, in this case, the control device 100 prohibits the reduction process. According to this configuration, it is possible to maintain the flow rate of hot water supplied by the heat pump 50, to heat as much hot water as the flow rate of hot water does not decrease, and to quickly increase the amount of heat stored in the tank 10. Can be increased.

  Although one embodiment has been described above, the specific mode is not limited to the above embodiment. In the following description, the same components as those described above are denoted by the same reference numerals and description thereof is omitted.

  In another embodiment, as shown in FIG. 8, in the second increase / decrease process of hot water supply water, the control device 100 may execute the process of step S151. Step S151 is executed after steps S133, S134, and S135. In step S151, the control device 100 monitors the temperature of the heating water detected by the thermistor 89, and determines whether or not the detected temperature of the heating water is equal to or higher than a predetermined second reference temperature (for example, 42 ° C.). To do. When the temperature of the heating water is equal to or higher than the second reference temperature (for example, 42 ° C.), the control device 100 determines YES in step S151 and proceeds to step S141. On the other hand, when the temperature of the heating water is not equal to or lower than the second reference temperature (NO), the control device 100 determines NO and returns to step S133. The second reference temperature (for example, 42 ° C.) is a temperature higher than the first reference temperature (for example, 40 ° C.) described above (see FIG. 3).

  In step S151, control device 100 may determine whether the temperature of the heating water is equal to or higher than a predetermined second reference temperature over a predetermined second reference time. The second reference time in step S151 is 1 minute 30 seconds, for example. If the temperature of the heating water is equal to or higher than the second reference temperature (42 ° C.) over the second reference time (1 minute 30 seconds), the control device 100 determines YES in step S151 and proceeds to step S141. Otherwise, the control device 100 determines NO and returns to step S133. Since the processes in steps S131 to S142 other than step S151 have been described above, a detailed description thereof will be omitted.

  In the hot water supply and heating system 2 described above, after the reduction process is executed, the hot water supply heating operation and the heating heating operation are executed simultaneously, and the heating water detected by the thermistor 89 in a state where the auxiliary heating operation is not executed. When the temperature is equal to or higher than a predetermined second reference temperature (for example, 42 ° C.), the control device 100 increases the number of revolutions of the hot water supply water circulation pump 22 to circulate between the tank 10 and the heat pump 50. Is increased (see steps S134, S151, and S142).

  After the reduction process is executed, the temperature of the heating water detected by the thermistor 89 is a predetermined second reference temperature in a state where the hot water supply heating operation and the heating heating operation are executed simultaneously and the auxiliary heating operation is not executed. In the above case, it is considered that the temperature of the heating water is sufficiently high, and thus the amount of heat used for heating the heating water may be reduced. Moreover, in the hot water supply and heating system 2 after the reduction process is executed, it takes a long time to store heat in the tank 10, and therefore it is preferable to return the operation of the hot water supply and heating system 2 to a normal operation. Therefore, in this case, the control device 100 executes an increase process. According to this configuration, since the flow rate of hot water supplied by the heat pump 50 is increased while the hot water supply heating operation and the heating heating operation are performed simultaneously, the amount of heat used for heating the hot water supply is relatively increased. However, the amount of heat used for heating water for heating is relatively reduced. Further, the operation of the hot water supply / heating system 2 can be returned to the normal operation.

  Further, in the hot water supply and heating system 2 described above, after the reduction process is executed, the hot water supply heating operation and the heating heating operation are executed at the same time, and the heating detected by the thermistor 89 in a state where the auxiliary heating operation is not executed. When the temperature of the irrigation water is equal to or higher than a predetermined second reference temperature (for example, 42 ° C.) over a predetermined second reference time (for example, 1 minute and 30 seconds), the control device 100 may execute the increasing process (step S134) , S151, S142).

  According to this configuration, there is a delay of the second reference time when the control device 100 determines whether or not the temperature of the heating water is equal to or higher than the second reference temperature. Even if the temperature of the heating water changes suddenly within a short time, the increase process is not executed if the temperature changes within the grace period (second reference time). Therefore, even if the temperature of the heating water changes suddenly, the flow rate of the hot water supply water does not increase thereby, and the flow rate of the hot water supply water can be appropriately managed. Thereby, the temperature of the water for heating can be managed appropriately.

  As mentioned above, although the specific example of the technique disclosed by this specification was demonstrated in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. Further, the technical elements described in the present specification or 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.

2: Hot water supply / heating system 4: Tank unit 6: Heat pump unit 8: Heat source unit 10: Tank 20: Tank water circulation path 22: Hot water circulation pump 24: Tap water introduction path 24a: First introduction path 24b: Second introduction path 30: Mixing valve 32: Tap water supply source 33: Heat source unit 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 50: Heat pump 52: Refrigerant circulation path 54 : Air heat exchanger 56: Fan 58: Three-fluid heat exchanger 60: Expansion valve 62: Compressor 64: Refrigerant bypass path 66: On-off valve 70: Systurn 72: Heating forward path 73: First heating heating path 74: Heating water Circulation pump 75: Low temperature heating circuit 76: High temperature heater 77: High temperature heating circuit 78: Low temperature heater 81: Hot water supply burner 82: Heating burner 8 4: First heating return path 88: Second heating heating path 89: Thermistor 90: Heating water regulating valve 91: Bath water circulation path 94: HP bypass path 96: Second heating return path 100: Control device

Claims (8)

A compressor that pressurizes the refrigerant, a condenser that condenses the refrigerant by exchanging heat between the refrigerant and the heating medium, and a vacuum that depressurizes the refrigerant. A heat pump having an evaporator for evaporating the refrigerant by exchanging heat between the mechanism and the refrigerant and the natural environment;
An auxiliary heat source machine that heats the heating medium by burning fuel,
A tank for storing a hot water heating medium heated by the heat pump;
A hot water supply device that supplies hot water using a hot water supply heat medium;
A heating device for heating using a heating medium;
Flow rate adjusting means for adjusting the flow rate of the hot water supply heat medium circulating between the tank and the heat pump;
Equipped with a control device,
A hot water supply heating operation for heating the hot water supply heat medium by the heat pump, a heating heating operation for heating the heating heat medium by the heat pump, and an auxiliary heating operation for heating the heating heat medium by the auxiliary heat source device can be executed. ,
When the hot water supply heating operation and the heating heating operation are performed simultaneously and the auxiliary heating operation is performed, the control device controls the flow rate adjusting means to circulate between the tank and the heat pump. A hot water supply and heating system that performs a reduction process for reducing the flow rate of the hot water heating medium. It further comprises heat storage amount detecting means for detecting the heat storage amount of the hot water storage medium stored in the tank,
2. The hot water supply and heating system according to claim 1, wherein the control device prohibits the reduction process when a heat storage amount detected by the heat storage amount detection unit is less than a predetermined first reference heat storage amount.   After the reduction process is executed, when the hot water supply heating operation and the heating heating operation are executed at the same time and the auxiliary heating operation is not executed, the control device controls the flow rate adjusting means. The hot water supply and heating system according to claim 1 or 2, wherein an increase process for increasing a flow rate of a hot water supply heat medium circulating between the tank and the heat pump is executed. A compressor that pressurizes the refrigerant, a condenser that condenses the refrigerant by exchanging heat between the refrigerant and the heating medium, and a vacuum that depressurizes the refrigerant. A heat pump having an evaporator for evaporating the refrigerant by exchanging heat between the mechanism and the refrigerant and the natural environment;
Temperature detecting means for detecting the temperature of the heating medium heated by the heat pump;
An auxiliary heat source machine that heats the heating medium by burning fuel,
A tank for storing a hot water heating medium heated by the heat pump;
A hot water supply device that supplies hot water using a hot water supply heat medium;
A heating device for heating using a heating medium;
Flow rate adjusting means for adjusting the flow rate of the hot water supply heat medium circulating between the tank and the heat pump;
Equipped with a control device,
A hot water supply heating operation for heating the hot water supply heat medium by the heat pump, a heating heating operation for heating the heating heat medium by the heat pump, and an auxiliary heating operation for heating the heating heat medium by the auxiliary heat source device can be executed. ,
The temperature of the heating medium detected by the temperature detecting means is equal to or lower than a predetermined first reference temperature in a state where the hot water heating operation and the heating heating operation are performed simultaneously and the auxiliary heating operation is not performed. In such a case, the control device controls the flow rate adjusting means to execute a reduction process for reducing the flow rate of the hot water supply heat medium circulating between the tank and the heat pump.   The temperature of the heating medium detected by the temperature detecting means is over a predetermined first reference time in a state where the hot water heating operation and the heating heating operation are performed simultaneously and the auxiliary heating operation is not performed. The hot water supply and heating system according to claim 4, wherein the control device executes the reduction process when the temperature is equal to or lower than the predetermined first reference temperature. It further comprises heat storage amount detecting means for detecting the heat storage amount of the hot water storage medium stored in the tank,
The hot water supply and heating system according to claim 4 or 5, wherein the control device prohibits the reduction process when a heat storage amount detected by the heat storage amount detection means is less than a predetermined second reference heat storage amount.   After the reduction process is executed, the hot water heating operation and the heating heating operation are executed at the same time, and the heating heating medium detected by the temperature detection means is not executed in the auxiliary heating operation. When the temperature is equal to or higher than a predetermined second reference temperature, the control device executes an increasing process for controlling the flow rate adjusting means to increase the flow rate of the hot water heating medium circulating between the tank and the heat pump. The hot water supply and heating system according to any one of claims 4 to 6. After the reduction process is executed, the hot water heating operation and the heating heating operation are executed at the same time, and the heating heating medium detected by the temperature detection means is not executed in the auxiliary heating operation. The hot water supply and heating system according to claim 7, wherein the control device executes the increasing process when the temperature is equal to or higher than the predetermined second reference temperature over a predetermined second reference time.

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