JP6007123B2 - Heat pump system - Google Patents

Description

  The present invention relates to a heat pump system.

  Patent Document 1 discloses a heat pump system. The heat pump system includes a compressor that pressurizes the refrigerant, a condenser that condenses the refrigerant by heat exchange between the heating medium and / or hot water supply water, an expander that decompresses the refrigerant, and an evaporation that vaporizes the refrigerant. A heat pump equipped with a heater, a heater that circulates a heating medium to each of the condenser and the heating terminal, hot water from a water supply source is stored in a hot water tank, and hot water is circulated between the condenser and the hot water tank. And a water heater for supplying hot water from the hot water tank to the hot water supply location. According to this heat pump system, it is possible to heat hot water used for hot water supply using a heat pump with high energy efficiency as a heat source, or to heat a heating medium used for heating.

JP 2009-299942 A

  In the heat pump system as described above, after the heating operation is performed, the heating heat medium has residual heat. If the heating medium is left as it is, it will be lost by natural heat dissipation. If the residual heat of the heating medium can be recovered, a more energy-saving heat pump system can be realized.

  The present specification provides a technique for solving the above problems. In the present specification, a technology capable of realizing energy saving is provided in a heat pump system that performs both hot water supply and heating using a single heat pump as a heat source.

  The present specification discloses a heat pump system. The heat pump system includes a compressor that pressurizes the refrigerant, a condenser that condenses the refrigerant by heat exchange between the heating medium and / or hot water supply water, an expander that decompresses the refrigerant, and an evaporation that vaporizes the refrigerant. A heat pump equipped with a heater, a heater that circulates a heating medium to each of the condenser and the heating terminal, hot water from a water supply source is stored in a hot water tank, and hot water is circulated between the condenser and the hot water tank. And a water heater for supplying hot water from the hot water tank to the hot water supply location. In the heat pump system, with the heat pump stopped, the heating heat medium is circulated to the condenser, and the hot water is circulated to the condenser to recover heat from the heating heat medium to the hot water in the condenser. The first heat recovery operation can be executed.

  In the above heat pump system, by performing the first heat recovery operation, the remaining heat of the heating heat medium can be recovered in hot water supply water and stored in the hot water storage tank. In general, various structures are used to prevent natural heat dissipation in hot water storage tanks, and natural heat dissipation from hot water in the hot water tank is smaller than natural heat dissipation from the heating heat medium in the heater. It becomes. According to said heat pump system, energy saving is realizable. Further, in the above heat pump system, heat is recovered from the heating medium to the hot water supply water using the condenser of the heat pump that is stopped, and the heat recovery from the heating medium to the hot water supply water is performed. There is no need to provide a separate heat exchanger. An energy-saving heat pump system can be realized with a small number of parts.

  The above heat pump system is capable of performing a heat storage operation by operating a heat pump, circulating hot water supply water to a condenser, and storing hot water heated by the condenser in a hot water storage tank. In addition, when the temperature of the heating medium is higher than the temperature of the hot water supplied to the condenser, the first heat recovery operation can be performed prior to the heat storage operation.

  According to the above heat pump system, at the time when heat storage in the hot water storage tank is required, the residual heat can be recovered from the heating medium to the hot water supply water and stored in the hot water storage tank. Energy saving can be realized by reducing the amount of heating by the heat pump required for heat storage in the hot water storage tank.

  The above heat pump system includes a reheating heat exchanger in which the heater exchanges heat between the bathtub water stored in the bathtub and the heating heat medium, and circulates the bathtub water to the reheating heat exchanger, In addition, the second heat recovery operation is performed such that the heating heat medium is circulated to the reheating heat exchanger, and heat recovery from the bath water to the heating heat medium is performed in the reheating heat exchanger. be able to.

  When the heater is provided with a reheating heat exchanger, reheating of bathtub water using a heat pump as a heat source becomes possible. In the above heat pump system, by executing the second heat recovery operation, the remaining heat of the bathtub water can be recovered to the heating medium, and the remaining heat of the heating medium is recovered to the hot water supply water, Can be stored. According to said heat pump system, further energy saving is realizable.

  The above heat pump system is capable of performing a heating operation by operating the heat pump, circulating the heating medium to the condenser, and circulating the heating medium heated by the condenser to the heating terminal. When starting, when the temperature of the bathtub water is higher than the temperature of the heating heat medium, the second heat recovery operation can be executed prior to the heating operation.

  According to the above heat pump system, the remaining heat can be recovered from the bathtub water to the heating heat medium at a timing when heating of the heating heat medium is required. Energy saving can be realized by reducing the amount of heating with a heat pump required for heating operation.

  Another heat pump system disclosed in the present specification includes a compressor that pressurizes the refrigerant, a condenser that condenses the refrigerant by heat exchange with the heating medium, an expander that decompresses the refrigerant, and vaporizes the refrigerant. A heat pump including an evaporator, and a heater that circulates the heating medium to each of the reheating heat exchanger that exchanges heat between the condenser, the heating terminal, and the bathtub water stored in the bathtub. ing. The heat pump system circulates the bath water to the reheating heat exchanger and circulates the heating heat medium to the reheating heat exchanger, and recovers heat from the bathtub water to the heating heat medium in the reheating heat exchanger. The second heat recovery operation can be performed, the heating pump can be operated, the heating medium can be circulated to the condenser, and the heating medium heated by the condenser can be circulated to the heating terminal. is there. The heat pump system performs the second heat recovery operation prior to the heating operation when the temperature of the bathtub water is higher than the temperature of the heating heat medium when starting the heating operation.

  Even with the above heat pump system, it is possible to recover the residual heat from the bathtub water to the heating medium at the timing when the heating medium is required to be heated. Energy saving can be realized by reducing the amount of heating with a heat pump required for heating operation.

  The above heat pump system further includes a bath detection means for detecting the user's bathing from the bathtub. When the user's bathing is detected, the temperature of the bath water is higher than the temperature of the heating heat medium. When it is high, the second heat recovery operation can be performed.

  According to said heat pump system, the remaining heat of the bathtub water left in the bathtub immediately after a user bathing can be collect | recovered to the heating medium, and can be utilized effectively. Energy saving can be realized.

  The above heat pump system further includes an input means by which a user can input an instruction to lower the temperature of the bathtub water stored in the bathtub, and when an instruction to lower the temperature of the bathtub water stored in the bathtub is input When the temperature of the bath water is higher than the temperature of the heating heat medium, the second heat recovery operation can be performed.

According to said heat pump system, when reducing the temperature of the bathtub water stored in the bathtub, the heat absorption from bathtub water can be collect | recovered to the heating medium for heating, and can be used effectively. Energy saving can be realized. Moreover, the usage-amount of tap water can be saved compared with the case where the temperature of bathtub water is reduced with hot water to a bathtub.
In the above heat pump system, the water heater returns the hot water supplied from the condenser to the upper part of the hot water tank according to the temperature of the hot water supplied from the condenser to the hot water tank, and the hot water supplied from the condenser. Can be configured to be switchable between the states of returning to the intermediate portion of the hot water tank.
According to the above heat pump system, the remaining heat of the heating medium can be recovered in the hot water supply water and stored in the hot water storage tank while maintaining the temperature stratification of the hot water storage tank.

  According to the technology disclosed in this specification, energy saving can be realized in a heat pump system that performs both hot water supply and heating using a single heat pump as a heat source.

It is a figure which shows typically the structure of the heat pump system 2 of an Example. It is a flowchart of the start determination of the water heat recovery operation for heating accompanying the start of heat storage operation. It is a flowchart of the start determination of the bathtub water heat recovery operation accompanying the start of heating operation. It is a flowchart of the start determination of the bathtub water heat recovery operation | movement performed after a user's bathing, and the water heat recovery operation for heating. It is a flowchart of the start determination of the bathtub water heat recovery operation | movement and heating water heat recovery operation which are performed when a warm water switch is turned on.

(Example)
FIG. 1 shows a heat pump system 2 of the present embodiment. The heat pump system 2 includes a tank unit 4, 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, a hot water circulation pump 22, and an outside temperature thermistor 55. 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 (evaporator) 54, a fan 56, a compressor 62, This is a heat pump cycle including a fluid heat exchanger 58 and an expansion valve 60. The outside air temperature thermistor 55 detects the outside air temperature.

  The air heat exchanger 54 exchanges heat between the outside air blown by the fan 56 and the refrigerant in the refrigerant circulation path 52. The air heat exchanger 54 is supplied with 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 three-fluid heat exchanger 58 is supplied with a 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). Furthermore, the three-fluid heat exchanger 58 can perform heat exchange between the refrigerant in the refrigerant circulation path 52 and water in the second heating heating path 84 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. In the three-fluid heat exchanger 58, heat exchange is also performed between the hot water supply water in the tank water circulation path 20 and the heating water in the second heating heating path 84.

  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.

  When the fan 56 and the compressor 62 are operated in the heat pump 50, the refrigerant in the refrigerant circulation path 52 circulates in the order of the air heat exchanger 54, the compressor 62, the three-fluid heat exchanger 58, and the expansion valve 60. In this case, in the three-fluid heat exchanger 58, the hot water supply water in the tank water circulation path 20 or the heating water in the second heating heating path 84 is heated.

  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 tank 10 is provided with a plurality of tank thermistors 10a, 10b, and 10c at a predetermined water level from the top. The tank thermistors 10a, 10b, and 10c detect the temperature of hot water supply water inside the tank 10 at each water level. Further, a tank top thermistor 10 d that detects the temperature of hot water supply water at the top of the tank 10 is provided at the top of the tank 10.

  The tank water circulation path 20 is switched between a tank water forward path 20a connecting the lower part of the tank 10 and the three-fluid heat exchanger 58, and a tank water return path 20b connecting the three-fluid heat exchanger 58 and the switching valve 21. A high temperature water return path 23 a that connects between the valve 21 and the upper part of the tank 10, and a low temperature water return path 23 b that connects between the switching valve 21 and the middle part of the tank 10 are provided. A hot water supply water thermistor 26a that detects the temperature of hot water supply water passing through the tank water supply pump 22 and a hot water supply water circulation pump 22 of the heat pump unit 6 are interposed in the tank water supply path 20a. In the tank water return path 20b, a hot water return water thermistor 26b for detecting the temperature of hot water passing through the inside is interposed. The switching valve 21 shuts off the low temperature water return path 23b and communicates the tank water return path 20b and the high temperature water return path 23a, and shuts off the high temperature water return path 23a and communicates the tank water return path 20b and the low temperature water return path 23b. Switch between. In the heat pump unit 6, when the heat pump 50 is operated and the hot water supply water circulation pump 22 is driven, the hot water supply water at the lower part of the tank 10 is sent to the three-fluid heat exchanger 58 via the tank water forward path 20a and heated. The The heated hot water supply water is sent to the high-temperature water return path 23a or the low-temperature water return path 23b via the tank water return path 20b and returned to the upper part or the middle part of the tank 10. 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.

  The upstream end of the tap water introduction path 24 is connected to a tap water supply source 32 outside the heat pump system 2. A tap water thermistor 28 for detecting the tap water supply temperature is interposed in the tap water introduction path 24. 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.

  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. A mixing thermistor 36 a that detects the temperature of hot water after mixing by the mixing valve 30 is interposed in the first hot water supply path 36 on the downstream side of the mixing valve 30. The first hot water supply path 36 on the downstream side of the mixing valve 30 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. In the second hot water supply passage 39, a hot water supply thermistor 39a for detecting the temperature of hot water supplied to the hot water tap 38 is interposed.

  The heat source unit 8 includes a cistern 70, a heating burner 82, 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, water or antifreeze. The upstream end of the heating forward path 72 is connected to the systern 70. A heating water circulation pump 74 and a low-temperature heating thermistor 72 a for detecting the temperature of the heating water passing through the heating forward path 72 are 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 is a heating device that uses relatively low-temperature heating water as a heat source, and is, for example, a floor heater. As the low-temperature heater 78, a desired number of low-temperature heaters can be attached. The low-temperature heating circulation path 75 is provided with a heating bypass path 78a for bypassing the low-temperature heater 78 and flowing heating water. A bypass valve 78b is interposed in the heating bypass path 78a. The downstream end of the low-temperature heating circulation path 75 is connected to the upstream end of the second heating / heating path 84. The downstream end of the second heating heating path 84 is connected to the upstream end of the heating return path 96 via the three-fluid heat exchanger 58 of the heat pump unit 6. The downstream end of the heating return path 96 is connected to the systern 70 of the heat source unit 8.

  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. A high temperature heating thermistor 73a for detecting the temperature of the heating water passing through the inside is interposed in the first heating heating path 73 on the downstream side of the heating burner 82. 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 is attached to the high temperature heating circuit 77. The high-temperature heater 76 is a heating device that uses relatively high-temperature heating water as a heat source, and is, for example, a bathroom heater / dryer. As the high-temperature heater 76, a desired number of high-temperature heaters can be attached. The downstream end of the high-temperature heating circulation path 77 is connected to the upstream end of the heating return path 96.

  The second heating heating path 84 and the heating return path 96 are connected by an HP bypass path 86. A mixing valve 88 is interposed at a connection portion between the second heating heating path 84 and the HP bypass path 86. The mixing valve 88 heats the heating water flowing into the heating return path 96 from the second heating heating path 84 via the three-fluid heat exchanger 58, and heats from the second heating heating path 84 via the HP bypass path 86. The ratio of the flow rate of the heating water flowing into the return path 96 is adjusted.

  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. The downstream end of the recirculation circulation path 79 is connected to the 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 bathtub water return thermistor 91 a for detecting the temperature of the bathtub water passing through the inside is interposed in the bathtub water circulation path 91 upstream of the reheating heat exchanger 97. A bathtub water circulation thermistor 91 b for detecting the temperature of the bathtub water passing through the inside is interposed in the bathtub water circulation path 91 on the downstream side of the reheating heat exchanger 97. Further, a water level sensor 91 c for detecting the water level of the bathtub 98 is interposed in the bathtub water circulation path 91.

  A hot water supply burner 81 is interposed in the hot water supply heating path 37. A hot water supply thermistor 37 a for detecting the temperature of hot water for passing hot water is provided in the hot water supply heating passage 37 downstream of the hot water supply burner 81. 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.

  The heat pump system 2 can perform the following various operations.

(Heat storage operation)
In the heat storage 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 heat storage operation, the control device 100 drives the compressor 62 and the fan 56 to operate the heat pump 50. At the same time, the switching valve 21 is switched to a state in which the tank water return path 20b and the high temperature water return path 23a communicate with each other, and the hot water supply water circulation pump 22 is driven.

  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. 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 hot water for hot water supply, the heat storage 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 also be performed in parallel with the above heat storage 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 water passing through the first hot water supply path 36 by the hot water supply burner 81. To do. The control device 100 controls the output of the hot water supply burner 81 so that the temperature of the hot water supply water supplied to the hot water tap 38 matches the hot water supply set temperature.

(Heating operation)
The 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 high-temperature heating water. When the execution of the heating operation is instructed by the user, the control device 100 rotates the heating water circulation pump 74. Further, the control device 100 drives the compressor 62 and the fan 56. 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 operation of the heat pump 50 and the output of the heating burner 82 are adjusted.

  As the number of low-temperature heaters 78 and high-temperature heaters 76 that are operating increases, the load on the heating water circulation pump 74 increases accordingly. Therefore, in this embodiment, the opening degree of the mixing valve 88 is adjusted according to the number of operating low temperature heaters 78 and high temperature heaters 76, and the more the number of operating low temperature heaters 78 and high temperature heaters 76, The ratio of the water for heating which flows into the HP bypass 86 is increased. When the ratio of the heating water flowing through the HP bypass 86 is increased, the ratio of the heating water flowing through the three-fluid heat exchanger 58 having a high pressure loss is reduced, and the load of the heating water circulation pump 74 is reduced. By setting it as such a structure, even when the number of the low temperature heater 78 and the high temperature heater 76 which operate | moves increases, the increase in the load of the water circulation pump 74 for heating can be suppressed.

(Hot water operation)
The hot water operation is an operation in which hot water is applied to the bathtub 98. When the user instructs the start of hot water operation, the heat pump system 2 starts the hot water operation. In the hot water operation, the hot water solenoid valve 42 is opened. When the hot water solenoid valve 42 is opened, tap water flows into the lower part of the tank 10 from the tap water introduction path 24 (first introduction path 24a) due to the water pressure from the tap water supply source 32. At the same time, the hot water supply water in the upper part of the tank 10 is supplied to the bathtub 98 via the first hot water supply path 36, the bathtub pouring path 40, and the bathtub water circulation path 91. In the hot water operation, the temperature of the water supplied to the bathtub pouring channel 40 is adjusted to the hot water setting temperature in the same manner as in the hot water operation. When the amount of water supplied to the bathtub 98 reaches the hot water setting water amount, the hot water operation is terminated.

(Reaping driving)
The chasing operation is an operation for chasing the bathtub water stored in the bathtub 98. When the user instructs the start of the chasing operation, the heat pump system 2 starts the chasing operation. In the reheating operation, the bathtub water circulation pump 99 is driven. Further, the reheating heat valve 83 is opened, and the heating water circulation pump 74 is driven. Thereby, bathtub water is sucked out from the bottom part of the bathtub 98, and is heated by heat exchange with the heating water in the reheating heat exchanger 97. The heated bathtub water is returned to the side of the bathtub 98. In the reheating operation, heating water is heated by the heating burner 82.

(Water heat recovery operation for heating)
After the heating operation or the reheating operation is performed, the systurn 70, the heating forward path 72, the first heating heating path 73, the low temperature heating circulation path 75, the high temperature heating circulation path 77, the reheating circulation path 79, and the second heating heating path 84 are performed. The heating water having residual heat stays inside the heating circuit such as the heating return path 96. If this heating water is left as it is, it will be lost by natural heat dissipation. In the heat pump system 2 of the present embodiment, by executing the heating water heat recovery operation, the remaining heat of the heating water can be recovered into the hot water supply water and stored in the tank 10.

  In the heating water heat recovery operation, the control device 100 opens the bypass valve 78b in a state where the heat pump 50 is stopped (that is, a state where the compressor 62 and the fan 56 are stopped), and the heating water in the second heating heating path 84 is opened. The opening degree of the mixing valve 88 is adjusted so that the entire amount flows to the three-fluid heat exchanger 58, and the heating water circulation pump 74 is driven. Accordingly, the heating water of the cistern 70 is circulated so as to pass through the three-fluid heat exchanger 58 and return to the cistern 70. Furthermore, the control apparatus 100 drives the hot water supply water circulation pump 22. As a result, hot water for the hot water at the lower part of the tank 10 passes through the three-fluid heat exchanger 58 and circulates back to the upper part or the intermediate part of the tank 10. By the heat exchange between the hot water supply water and the heating water in the three-fluid heat exchanger 58, the hot water supply water is heated and the heating water is cooled. When the detected temperature of the hot water return thermistor 26b is higher than the detected temperature of the tank thermistor 10c, the switching valve 21 is switched to a state where the tank water return path 20b and the high temperature water return path 23a communicate with each other. The hot water supply water is allowed to flow into the upper part of the tank 10. When the detected temperature of the hot water return thermistor 26b is lower than the detected temperature of the tank thermistor 10c, the switching valve 21 is switched to a state where the tank water return path 20b and the low temperature water return path 23b communicate with each other. The hot water supply water is caused to flow into the intermediate portion of the tank 10. By setting it as such a structure, the remaining heat of heating water can be collect | recovered in hot water supply water, and the tank 10 can be heat-accumulated, maintaining the temperature stratification of the tank 10. FIG.

(Tub water heat recovery operation)
After the user's bathing, bathtub water having residual heat remains in the bathtub 98. If this bath water is left as it is, it will be lost by natural heat dissipation. In the heat pump system 2 of a present Example, the residual heat of bathtub water can be collect | recovered by heating water by performing bathtub water heat recovery driving | operation.

  In the bathtub water heat recovery operation, the control device 100 drives the bathtub water circulation pump 99. As a result, the bathtub water in the bathtub 98 circulates through the reheating heat exchanger 97 and returns to the bathtub 98. Further, the control device 100 opens the reheating heat valve 83 and drives the heating water circulation pump 74. As a result, the heating water in the cistern 70 circulates back to the cistern 70 through the reheating heat exchanger 97. By the heat exchange between the heating water and the bathtub water in the reheating heat exchanger 97, the heating water is heated and the bathtub water is cooled. By setting it as such a structure, the residual heat of bathtub water can be collect | recovered to heating water. The residual heat recovered from the bath water into the heating water can be used for the subsequent heating operation. Alternatively, the above-described heating water heat recovery operation may be executed to recover the remaining heat recovered from the bath water into the heating water into hot water supply water and store in the tank 10.

(Start judgment of heat recovery operation)
When the above-described heating water heat recovery operation and bathtub water heat recovery operation can be performed, the heat pump system 2 automatically inquires about the operation mode in which these heat recovery operations are performed and the necessity of the heat recovery operation. The operation can be performed in either the operation mode or the operation mode in which the heat recovery operation is not always executed. The operation mode in which the heat pump system 2 is operated can be selected in advance by the user via a remote controller or the like connected to the control device 100 in advance. Below, when the operation mode which performs heat recovery operation automatically, or the operation mode which inquires the user of the necessity of heat recovery operation is selected, the control apparatus 100 performs various start determinations of heat recovery operation. An aspect is demonstrated.

  FIG. 2 shows a start determination flow of the heating water heat recovery operation accompanying the start of the heat storage operation.

  In step S202, control device 100 stands by until there is an instruction for a heat storage operation. If there is an instruction for heat storage operation (YES in step S202), the process proceeds to step S204.

  In step S204, the control device 100 determines whether or not the heating water heat recovery operation is possible. Whether the heating water heat recovery operation is possible is determined by driving the heating water circulation pump 74 to acquire the detected temperature of the high temperature heating thermistor 73a, acquiring the detected temperature of the tank thermistor 10c, and comparing the two. . The control device 100 determines that the heating water heat recovery operation is possible when the detected temperature of the high temperature heating thermistor 73a is higher than the detected temperature of the tank thermistor 10c by a predetermined temperature or more. If it is determined that the heating water heat recovery operation is possible (YES in step S204), the process proceeds to step S206. If it is determined that the heating water heat recovery operation is not possible (NO in step S204), the process proceeds to step S214, and the heat storage operation is performed without performing the heating water heat recovery operation.

  In step S206, the control device 100 determines whether or not to inquire the user about the execution of the heating water heat recovery operation. In the present embodiment, when the heat pump system 2 is operating in an operation mode for inquiring the user whether or not heat recovery operation is necessary, an inquiry is made to the user, and the heat pump system 2 automatically executes the heat recovery operation. When operating in the operation mode, no inquiry is made to the user. If an inquiry is made to the user (YES in step S206), the process proceeds to step S208. When the user is not inquired (NO in step S206), the process proceeds to step S212, and the heating water heat recovery operation is executed without inquiring the user.

  In step S208, the control device 100 inquires of the user whether or not to perform the heating water heat recovery operation. In general, when the heating water heat recovery operation is performed prior to the heat storage operation, the time until the heat storage in the tank 10 is completed is slower than when the heat storage operation is performed without performing the heating water heat recovery operation. . Therefore, in the heat pump system 2 of the present embodiment, the estimated time when the heat storage in the tank 10 is completed is estimated for both the case where the heating water heat recovery operation is performed and the case where the heating water heat recovery operation is not performed. To the user. Then, the user is prompted to input an instruction to execute the heating water heat recovery operation or an instruction to stop the heating water heat recovery operation. The scheduled time for completing the heat storage in the tank 10 is estimated from the current time, the time required for the heating water heat recovery operation, and the time required for the heat storage operation. The time required for the heating water heat recovery operation is calculated based on the capacity of the heating water in the heating circuit, the detected temperature of the high temperature heating thermistor 73a, the detected temperature of the feed water thermistor 28, and the like. The time required for the heat storage operation is calculated based on the capacity of hot water supply water in the tank 10, the detected temperature of the outside air temperature thermistor 55, the detected temperature of the water supply thermistor 28, and the like.

  In step S210, control device 100 determines whether or not an instruction to stop the heating water heat recovery operation is input within a predetermined time. In the heat pump system 2 of the present embodiment, in addition to the case where an instruction to execute the heating water heat recovery operation is input from the user, the case where no instruction is input from the user within a predetermined time is also used. Perform recovery operation. If there is an instruction to stop the heating water heat recovery operation within a predetermined time (YES in step S210), the process proceeds to step S214, and the heat storage operation is performed without performing the heating water heat recovery operation. If there is no instruction to stop the heating water heat recovery operation within the predetermined time (NO in step S210), the process proceeds to step S212.

  In step S212, the control device 100 executes a heating water heat recovery operation. As a result, the remaining heat of the heating water is recovered into the hot water supply water and stored in the tank 10. When the heating water heat recovery operation ends, the process proceeds to step S214.

  In step S214, the control apparatus 100 performs a heat storage operation. As a result, heat is stored in the tank 10 using the heat pump 50 as a heating source.

  In the example illustrated in FIG. 2, the configuration in which the start determination of the heating water heat recovery operation is performed at the start of the heat storage operation has been described. It is good also as composition which performs. With such a configuration, it is possible to store heat in the tank 10 without naturally dissipating the remaining heat of the heating water immediately after the heating operation or the reheating operation.

  FIG. 3 shows a start determination flow of the bath water heat recovery operation accompanying the start of the heating operation.

  In step S302, control device 100 stands by until an instruction for heating operation is given. If there is an instruction for heating operation (YES in step S302), the process proceeds to step S304.

  In step S304, control device 100 determines whether or not the bath water heat recovery operation is possible. Whether the bathtub water heat recovery operation is possible is determined by driving the heating water circulation pump 74 to obtain the detected temperature of the high temperature heating thermistor 73a, driving the bathtub water circulation pump 99, and setting the detected temperature of the bathtub water return thermistor 91a. This is done by obtaining and comparing the two. The control device 100 determines that the bath water heat recovery operation is possible when the detected temperature of the bathtub water return thermistor 91a is higher than the detected temperature of the high temperature heating thermistor 73a by a predetermined temperature or more. If it is determined that the bath water heat recovery operation is possible (YES in step S304), the process proceeds to step S306. If it is determined that the bath water heat recovery operation is not possible (NO in step S304), the process proceeds to step S314, and the heating operation is performed without performing the bath water heat recovery operation.

  In step S306, the control device 100 determines whether or not to inquire the user about the execution of the bathtub water heat recovery operation. In the present embodiment, when the heat pump system 2 is operating in an operation mode for inquiring the user whether or not heat recovery operation is necessary, an inquiry is made to the user, and the heat pump system 2 automatically executes the heat recovery operation. When operating in the operation mode, no inquiry is made to the user. When making an inquiry to the user (YES in step S306), the process proceeds to step S308. If the user is not inquired (NO in step S306), the process proceeds to step S312 to execute the bathtub water heat recovery operation without inquiring the user.

  In step S308, the control apparatus 100 inquires of the user whether or not to execute the bathtub water heat recovery operation. In general, when the bathtub water heat recovery operation is performed prior to the heating operation, the rise of the heating temperature is delayed as compared to the case where the heating operation is performed without performing the bathtub water heat recovery operation. Therefore, in the heat pump system 2 of the present embodiment, the time required for the bath water heat recovery operation is calculated and notified to the user via the remote controller. Then, the user is prompted to input an instruction to execute the bathtub water heat recovery operation or an instruction to stop the bathtub water heat recovery operation. The time required for the bathtub water heat recovery operation is calculated based on the capacity of the bathtub water in the bathtub 98, the detected temperature of the bathtub water return thermistor 91a, the detected temperature of the high temperature heating thermistor 73a, and the like.

  In step S310, control device 100 determines whether or not an instruction to stop the bath water heat recovery operation is input within a predetermined time. In the heat pump system 2 of the present embodiment, in addition to the case where an instruction to execute the bathtub water heat recovery operation is input from the user, the case where no instruction is input from the user within a predetermined time, Perform heat recovery operation. If there is an instruction to cancel the bath water heat recovery operation within a predetermined time (YES in step S310), the process proceeds to step S314, and the heating operation is performed without performing the bath water heat recovery operation. If there is no instruction to stop the bath water heat recovery operation within the predetermined time (NO in step S310), the process proceeds to step S312.

  In step S312, control device 100 performs a bath water heat recovery operation. Thereby, the residual heat of bathtub water is collect | recovered by the water for heating, and can be utilized for subsequent heating operation. When the bathtub water heat recovery operation ends, the process proceeds to step S314.

  In step S314, the control apparatus 100 performs a heating operation. Thereby, heating is performed.

  FIG. 4 shows a start determination flow of the bathtub water heat recovery operation and the heating water heat recovery operation performed after the user bathes.

  In step S402, control device 100 waits until it detects a user's bathing. The user's bathing can be detected based on, for example, fluctuations in the amount of water detected by the water level sensor 91c. If a user's bathing is detected (YES in step S402), the process proceeds to step S404.

  In step S404, control device 100 determines whether or not the bath water heat recovery operation is possible. If it is determined that the bath water heat recovery operation is possible (YES in step S404), the process proceeds to step S406. If it is determined that the bath water heat recovery operation is not possible (NO in step S404), the process proceeds to step S408.

  In step S406, a bathtub water heat recovery operation is executed. Thereby, the remaining heat of the bathtub water is recovered into the heating water. When the bathtub water heat recovery operation ends, the process proceeds to step S408.

  In step S408, control device 100 determines whether or not the heating water heat recovery operation is possible. If it is determined that the heating water heat recovery operation is possible (YES in step S408), the process proceeds to step S410. If it is determined that the heating water heat recovery operation is not possible (NO in step S408), the processing in FIG. 4 is terminated.

  In step S410, the control device 100 executes a heating water heat recovery operation. As a result, the remaining heat of the heating water is recovered into the hot water supply water and stored in the tank 10. When the heating water heat recovery operation is finished, the processing of FIG. 4 is finished.

  According to the process shown in FIG. 4, when the user bathes, the remaining heat is automatically recovered from the bath water to the heating water, and further, the remaining heat is recovered from the heating water to the hot water supply water and can be stored in the tank 10. . Note that FIG. 4 does not show processing related to the inquiry to the user, but it may be configured to make an inquiry to the user as in the processing shown in FIGS.

  FIG. 5 shows a start determination flow of the bathtub water heat recovery operation and the heating water heat recovery operation performed when the user turns on the lukewarm water switch. The lukewarm switch here is a switch that is provided in the remote controller and is operated when the user wants to lower the temperature of the bath water stored in the bath 98.

  In step S502, control device 100 stands by until the warm water switch is turned on. When the warm water switch is turned on (YES in step S502), the process proceeds to step S504.

  In step S504, control device 100 determines whether or not the bathtub water heat recovery operation is possible. When it is determined that the bath water heat recovery operation is possible (YES in step S504), the process proceeds to step S506, and the bath water heat recovery operation is executed. By executing the bathtub water heat recovery operation, heat recovery from the bathtub water to the heating water is performed, and the temperature of the bathtub water stored in the bathtub 98 is lowered. When it is determined that the bath water heat recovery operation is not possible (NO in step S504), the process proceeds to step S508, and the hot water operation is executed. In the hot water supply operation performed in step S508, the temperature of the bathtub water stored in the bathtub 98 is increased by supplying hot water for hot water having a temperature lower than that of the bathtub water stored in the bathtub 98 to the bathtub 98 by a predetermined amount. descend.

  In step S510, control device 100 determines whether or not the heating water heat recovery operation is possible. If it is determined that the heating water heat recovery operation is possible (YES in step S510), the process proceeds to step S512. When it is determined that the heating water heat recovery operation is not possible (NO in step S510), the processing in FIG. 5 is terminated.

  In step S512, the control device 100 executes a heating water heat recovery operation. As a result, the remaining heat of the heating water is recovered into the hot water supply water and stored in the tank 10. When the heating water heat recovery operation is finished, the processing of FIG. 5 is finished.

  According to the process shown in FIG. 5, when the user turns on the hot water switch, the temperature of the bathtub water in the bathtub 98 can be lowered by heat recovery from the bathtub water to the heating water. Compared to the case where the temperature of the bathtub water is lowered by hot water supplied to the bathtub 98, the amount of tap water used can be saved and energy saving can be realized. In addition, although the process regarding the inquiry to a user is not shown in FIG. 5, it is good also as a structure which performs the inquiry to a user similarly to the process shown to FIG. 2 and FIG.

  As mentioned above, although the Example of this invention was described 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.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

2 Heat pump system 4 Tank unit 6 Heat pump unit 8 Heat source unit 10 Tank 10a, 10b, 10c Tank thermistor 20 Tank water circulation path 20a Tank water return path 20b Tank water return path 21 Switching valve 22 Hot water circulation pump 23a Hot water return path 23b Low temperature water return path 24 tap water introduction path 24a first introduction path 24b second introduction path 26a hot water supply water thermistor 26b hot water return thermistor 28 water supply thermistor 30 mixing valve 32 tap water supply source 33 heat source machine bypass path 34 bypass valve 36 first hot water supply path 36a Mixing thermistor 37 Hot water heating path 37a Hot water discharge thermistor 38 Hot water tap 39 Second hot water supply path 39a Hot water supply thermistor 40 Bath pouring path 42 Pouring solenoid valve 50 Heat pump 52 Refrigerant circulation path 54 Air heat exchanger 55 Outside temperature thermistor 56 Fan 5 8 Three-fluid heat exchanger 60 Expansion valve 62 Compressor 70 Systern 72 Heating forward path 72a Low temperature heating thermistor 73 First heating heating path 73a High temperature heating thermistor 74 Heating water circulation pump 75 Low temperature heating circuit 76 High temperature heater 77 High temperature heating circuit 78 Low temperature heater 78a Heating bypass path 78b Bypass valve 79 Reheating circulation path 81 Hot water supply burner 82 Heating burner 83 Reheating thermal valve 84 Second heating heating path 86 HP bypass path 88 Mixing valve 91 Bath water circulation path 91a Bath water Return thermistor 91b Bathing water thermistor 91c Water level sensor 96 Heating return path 97 Reheating heat exchanger 98 Bathtub 99 Bathtub water circulation pump 100 Control device

Claims (7)

A compressor that pressurizes the refrigerant; a condenser that condenses the refrigerant by heat exchange between the heating medium and / or hot water supply water; an expander that depressurizes the refrigerant; and a heat pump that includes an evaporator that vaporizes the refrigerant. ,
A heating machine that circulates a heating medium to each of the condenser and the heating terminal;
It has a water heater that stores hot water from a water supply source in a hot water tank, circulates the hot water between the condenser and the hot water tank, and supplies hot water from the hot water tank to the hot water location.
With the heat pump stopped, the heating heat medium is circulated to the condenser, and the hot water is circulated to the condenser to recover heat from the heating heat medium to the hot water in the condenser. A heat pump system that can be operated. It is possible to perform a heat storage operation by operating a heat pump, circulating hot water supply water to the condenser, and storing hot water heated by the condenser in a hot water storage tank,
The heat pump according to claim 1, wherein when the heat storage operation is started, the first heat recovery operation is executed prior to the heat storage operation when the temperature of the heating medium is higher than the temperature of hot water supplied to the condenser. system. The heater has a reheating heat exchanger that exchanges heat between the bathtub water stored in the bathtub and the heating medium,
The second bath water is circulated to the heat exchanger and the heating medium is circulated to the second heat exchanger to recover heat from the bathtub water to the heating heat medium in the second heat exchanger. The heat pump system according to claim 1, wherein the heat recovery operation can be performed. It is possible to perform a heating operation by operating a heat pump, circulating the heating medium to the condenser, and circulating the heating medium heated by the condenser to the heating terminal,
The heat pump system according to claim 3, wherein when the heating operation is started, the second heat recovery operation is executed prior to the heating operation when the temperature of the bathtub water is higher than the temperature of the heating medium. A bath detection means for detecting a user's bath from the bathtub;
5. The heat pump system according to claim 3, wherein when the bathing of the user is detected, the second heat recovery operation is executed when the temperature of the bath water is higher than the temperature of the heating heat medium. The apparatus further includes an input means that allows the user to input an instruction to lower the temperature of the bathtub water stored in the bathtub.
When the instruction | indication which lowers the temperature of the bath water stored in the bathtub is input, when the temperature of the bath water is higher than the temperature of the heating medium, the second heat recovery operation is executed. The heat pump system according to any one of 5. The water heater returns the hot water supplied from the condenser to the upper part of the hot water tank according to the temperature of the hot water supplied from the condenser to the hot water tank, and the hot water supplied from the condenser is in the middle of the hot water tank. The heat pump system according to any one of claims 1 to 6, wherein the heat pump system is switchable between states to be returned to the normal state.

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