JP7097755B2 - Hot water heater - Google Patents

Description

The present invention relates to a hot water supply / heating device that heats water using a refrigeration cycle.

Conventionally, there is known a hot water supply device that heats water using a refrigeration cycle and supplies hot water using hot water obtained by heating. As such a hot water supply device, for example, a heat pump hot water supply device that heats water by exchanging heat between the refrigerant flowing through the refrigerant circuit and the water flowing through the hot water supply circuit and stores the heated water in a hot water storage tank. It is used.

Various methods have been proposed as a method for determining the amount of hot water stored in the hot water storage tank, the boiling temperature, and the like. For example, in Patent Document 1, the amount of heat required for hot water filling per day is calculated from the operation results of the past set period, and the calculated required amount of heat per day is used for the target boiling during the boiling operation. It is disclosed to calculate the temperature.

Japanese Unexamined Patent Publication No. 2009-210215

By the way, in the hot water supply device described in Patent Document 1, since the capacity of the hot water storage tank is small, the target boiling temperature is set high when a large hot water supply load such as filling a bathtub is generated. However, when the boiling temperature is high, the COP (Coefficient of Performance) of the heat pump is lowered, so that the efficiency is deteriorated.

Further, in this water heater, the boiling temperature is set based on the past usage record. Therefore, if the amount of hot water used is smaller than the actual amount in the past, the amount of heat boiled is wasted, and if the amount of hot water supplied exceeds the actual amount, the hot water may run out.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a hot water supply / heating device capable of efficiently boiling hot water even when the capacity of a hot water storage tank is small.

In the hot water supply / heating device of the present invention, a refrigerant circuit through which a refrigerant flows is formed by sequentially connecting a compressor, a condenser, a first expansion valve and an evaporator, and the water flowing into the condenser is heated by the heat of the refrigerant. It comprises a heat pump unit for heating, a hot water storage unit having a hot water storage tank for storing hot water, and a user-side heat exchanger connected to the hot water storage unit to heat or cool indoor air. A bypass circuit that branches from between the first expansion valve and is connected to the intermediate pressure portion of the compressor, and water that is provided in the bypass circuit and flows through the refrigerant side flow path and the hot water side flow path. It has an intermediate pressure heat exchanger that exchanges heat with and evaporates the refrigerant, and a second expansion valve provided in the bypass circuit that reduces the pressure of the refrigerant flowing through the bypass circuit. An exhaust heat recovery circuit is formed by connecting the hot water side flow path of the heat exchanger and the user side heat exchanger, the water heated by the condenser, and the water stored in the hot water storage tank. Hot water is supplied to the outside.

As described above, according to the hot water supply / heating device of the present invention, the water heated by the condenser and the heated water stored in the hot water storage tank are supplied to the outside to supply hot water to the outside even when the capacity of the hot water storage tank is small. Efficient boiling of hot water can be performed.

It is a schematic diagram which shows the installation example of the hot water supply heating apparatus which concerns on Embodiment 1. FIG. It is a schematic diagram which shows an example of the structure of the hot water supply heating apparatus which concerns on Embodiment 1. FIG. It is a functional block diagram which shows an example of the structure of the heat pump controller of FIG. It is a functional block diagram which shows an example of the structure of the hot water storage unit controller of FIG. It is a flowchart which shows an example of the flow of the general hot water supply processing by the hot water supply heating apparatus which concerns on Embodiment 1. FIG. It is a flowchart which shows an example of the flow of the mode selection process at the time of the bath hot water supply operation by the hot water supply heating apparatus which concerns on Embodiment 1. FIG. It is a flowchart which shows an example of the flow of the bath hot water supply processing in the normal bath hot water supply mode by the hot water supply heating apparatus which concerns on Embodiment 1. FIG. It is a flowchart which shows an example of the flow of the bath hot water supply process in the waste heat recovery bath hot water supply mode by the hot water supply heating apparatus which concerns on Embodiment 1. FIG. It is a flowchart which shows an example of the flow of the process of the skeleton heat storage operation by the hot water supply heating apparatus which concerns on Embodiment 1.

Embodiment 1.
Hereinafter, the hot water supply / heating device according to the first embodiment of the present invention will be described. The hot water supply / heating device according to the first embodiment heats water by using a refrigerating cycle, stores hot water obtained by heating the water, and heats a living room or the like.

[Installation example of hot water supply / heating device 1]
FIG. 1 is a schematic view showing an installation example of the hot water supply / heating device 1 according to the first embodiment. The example of FIG. 1 shows a case where the hot water supply / heating device 1 is installed in a house 100 having a living room 100a, a dressing room 100b, a bathroom 100c, and a non-living space 100d such as an attic. As shown in FIG. 1, the hot water supply / heating device 1 includes a heat pump unit 10 and a hot water storage unit 20.

The heat pump unit 10 and the hot water storage unit 20 are installed outdoors and are connected by a hot water outlet pipe 2 and a water inlet pipe 3 for a boiling circuit, and a waste heat discharge pipe 4 and a waste heat return pipe 5 for a waste heat recovery circuit. There is. The hot water storage unit 20 is connected to a general hot water supply pipe 110a for a general hot water supply circuit, a bath hot water supply pipe 110b for a bath hot water supply circuit, and a heating going pipe 6 and a heating return pipe 7 for the heating circuit.

A hot water supply end 101 such as a shower and a faucet provided in the bathroom 100c or the like is connected to the general hot water supply pipe 110a, and the hot water flowing out from the hot water storage unit 20 is supplied to the hot water supply end 101. A bathtub 102 provided in the bathroom 100c is connected to the bath hot water supply pipe 110b, and hot water flowing out of the hot water storage unit 20 is supplied to the bathtub 102.

The heating going pipe 6 and the heating return pipe 7 include a heating device 103 such as a floor heater and a radiator installed in the living room 100a and the dressing room 100b, and an exhaust heat recovery indoor unit 104 installed in the non-living space 100d. It is connected. As a result, hot water circulates between the hot water storage unit 20, the heating device 103, and the waste heat recovery indoor unit 104.

The number of the hot water supply end 101, the bathtub 102, the heating device 103, and the waste heat recovery indoor unit 104 is not limited to this example, and can be appropriately determined according to the scale of the house 100 and the like. Further, the waste heat recovery indoor unit 104 does not necessarily have to be provided.

[Configuration of hot water supply / heating device 1]
FIG. 2 is a schematic view showing an example of the configuration of the hot water supply / heating device 1 according to the first embodiment.
As shown in FIG. 2, the hot water supply / heating device 1 includes a heat pump unit 10, a hot water storage unit 20, a hot water supply remote controller (hereinafter referred to as “hot water supply remote controller”) 40, and a heating remote controller (hereinafter referred to as “heating remote controller”) 50. It is composed of. The heat pump unit 10 and the hot water storage unit 20 are connected by a hot water outlet pipe 2 and a water inlet pipe 3 for a boiling circuit, and a waste heat discharge pipe 4 and a waste heat return pipe 5 for a waste heat recovery circuit.

In this example, one user-side heat exchanger 60 and one waste heat recovery heat exchanger 70 are connected to the hot water storage unit 20 via the heating going pipe 6 and the heating return pipe 7. The number of the user-side heat exchanger 60 and the waste heat recovery heat exchanger 70 is not limited to this, and a plurality of each may be provided. Further, the waste heat recovery heat exchanger 70 may not be provided.

(Heat pump unit 10)
The heat pump unit 10 includes a compressor 11, a condenser 12, a first expansion valve 13, an evaporator 14, a second expansion valve 15, an intermediate pressure heat exchanger 16, and a blower 17. A refrigerant circuit is formed by sequentially connecting the compressor 11, the condenser 12, the first expansion valve 13, and the evaporator 14 with a refrigerant pipe. As the refrigerant flowing through the refrigerant circuit, for example, refrigerants such as CO ₂ (carbon dioxide), HFC (hydrofluorocarbon), HC (hydrocarbon) and HFO (hydrofluoroolefin) can be applied, but are not particularly limited thereto. do not have.

The compressor 11 sucks in the low-temperature low-pressure refrigerant, compresses the sucked refrigerant, and discharges the high-temperature and high-pressure refrigerant. The compressor 11 is composed of, for example, an inverter compressor or the like whose capacity, which is a transmission amount per unit time, is controlled by changing the operating frequency. The operating frequency of the compressor 11 is controlled by the heat pump controller 8 described later so that the heating capacity becomes a set value.

The compressor 11 is, for example, a two-stage compressor divided into a low-pressure side compression chamber 11a and a high-pressure side compression chamber 11b. In this case, the suction side of the low pressure side compression chamber 11a is connected to the evaporator 14, and the discharge side of the high pressure side compression chamber 11b is connected to the condenser 12. Further, the intermediate pressure portion between the discharge side of the low pressure side compression chamber 11a and the suction side of the high pressure side compression chamber 11b is connected to the intermediate pressure heat exchanger 16. The compressor 11 is not limited to the two-stage compressor, and may be provided with, for example, an injection port for injecting an intermediate pressure refrigerant in the middle of the compression chamber.

The condenser 12 exchanges heat between the refrigerant flowing through the refrigerant circuit connected to the refrigerant side flow path and the water flowing through the boiling circuit connected to the water side flow path, and dissipates the heat of the refrigerant to water. To condense the refrigerant. The first expansion valve 13 is connected between the condenser 12 and the evaporator 14 and expands the refrigerant flowing out of the condenser 12. The first expansion valve 13 is composed of, for example, an electronic expansion valve or a valve capable of controlling the opening degree. The opening degree of the first expansion valve 13 is set so that the superheat degree on the suction side of the compressor 11 becomes a preset superheat degree during the hot water storage operation, or the discharge temperature of the refrigerant discharged from the compressor 11 is set. It is controlled by the heat pump controller 8 so that the temperature becomes a preset temperature.

The evaporator 14 exchanges heat between the outdoor air supplied by the blower 17 and the refrigerant. The evaporator 14 evaporates the refrigerant and cools the outdoor air by the heat of vaporization at that time. The blower 17 supplies outdoor air to the evaporator 14. The rotation speed of the blower 17 is controlled by the heat pump controller 8. By controlling the rotation speed, the amount of air blown to the evaporator 14 is adjusted.

The second expansion valve 15 is provided in a bypass circuit that branches from between the condenser 12 and the first expansion valve 13 and is connected to the intermediate pressure portion of the compressor 11, and expands the refrigerant flowing out of the condenser 12. .. The second expansion valve 15 is composed of, for example, an electronic expansion valve or a valve capable of controlling the opening degree. The opening degree of the second expansion valve 15 is set to a preset degree of overheating of the refrigerant flowing into the intermediate pressure portion of the compressor 11 during the bath hot water supply operation in the waste heat recovery bath hot water supply mode described later. As such, it is controlled by the heat pump controller 8.

The intermediate pressure heat exchanger 16 is provided in the bypass circuit and exchanges heat between the refrigerant flowing in the refrigerant side flow path and the hot water flowing in the hot water side flow path. The intermediate pressure heat exchanger 16 evaporates the refrigerant and cools the hot water by the heat of vaporization at that time. When the compressor 11 is provided with an injection port, the bypass circuit branched from between the condenser 12 and the first expansion valve 13 is connected to the injection port of the compressor 11.

Further, the heat pump unit 10 includes a water inlet temperature sensor 41, a hot water outlet temperature sensor 42, and an outside air temperature sensor 43. The water entry temperature sensor 41 detects the temperature of the water flowing into the water side flow path of the condenser 12. The hot water temperature sensor 42 detects the temperature of the water flowing out from the water side flow path of the condenser 12. The outside air temperature sensor 43 detects the temperature of the outside air of the heat pump unit 10.

Further, the heat pump unit 10 includes a heat pump controller 8. The heat pump controller 8 controls each part provided in the heat pump unit 10 according to various operation modes performed by the hot water supply / heating device 1. In particular, in the first embodiment, the heat pump controller 8 controls the operating frequency of the compressor 11, the opening degree of the first expansion valve 13 and the second expansion valve 15, and the like.

FIG. 3 is a functional block diagram showing an example of the configuration of the heat pump controller 8 of FIG. As shown in FIG. 3, the heat pump controller 8 includes an information acquisition unit 81, a calculation unit 82, an equipment control unit 83, a communication unit 84, and a storage unit 85. The heat pump controller 8 is configured with hardware such as a circuit device that realizes various functions by executing software on an arithmetic unit such as a microcomputer.

The information acquisition unit 81 acquires information detected by various sensors such as the incoming water temperature sensor 41, the hot water temperature sensor 42, and the outside air temperature sensor 43. The calculation unit 82 performs calculation processing based on various information acquired by the information acquisition unit 81 and the information stored in the storage unit 85 corresponding to each information.

The equipment control unit 83 controls the compressor 11, the first expansion valve 13, the second expansion valve 15, and the blower 17 according to the calculation result of the calculation unit 82 and the like. For example, the device control unit 83 controls the operating frequency of the compressor 11 so that the heating capacity becomes a preset set capacity value. Further, the device control unit 83 causes the compressor 11 to have a preset superheat degree of the refrigerant on the suction side, or the discharge temperature of the compressor 11 to have a preset set temperature. In addition, the opening degree of the first expansion valve 13 is controlled. Further, the device control unit 83 opens the second expansion valve 15 so that the superheat degree of the refrigerant flowing into the intermediate pressure part of the compressor 11 becomes a preset superheat degree in the waste heat recovery mode. Control the degree.

The communication unit 84 transmits / receives various information to / from the hot water storage unit controller 9. The storage unit 85 stores various values used in each unit of the heat pump controller 8 in advance. For example, the storage unit 85 stores in advance the set degree of superheat of the refrigerant flowing into the compressor 11 used when the equipment control unit 83 controls the first expansion valve 13 and the second expansion valve 15.

(Hot water storage unit 20)
The hot water storage unit 20 of FIG. 2 includes a hot water storage tank 21, a boiling pump 22, a general hot water supply mixing valve 23, a bath hot water supply mixing valve 24, a hot water filling on-off valve 25, a heating heat exchanger 26, a primary side heating pump 27, and heating. It includes a header 28, a heating return header 29, a flow rate adjusting valve 30, a secondary heating pump 31, and an exhaust heat switching valve 32. The hot water storage unit 20 has a water supply port 20a to which water is supplied from the outside, a general hot water supply port 20b for supplying hot water to the hot water supply end 101 (see FIG. 1), and a bathtub for supplying hot water to the bathtub 102 (see FIG. 1). A hot water supply port 20c is provided.

A boiling circuit is formed by connecting the hot water storage tank 21, the boiling pump 22, and the condenser 12 of the heat pump unit 10 with a pipe. Further, the intermediate pressure heat exchanger 16, the heating forward header 28, the user side heat exchanger 60 and the exhaust heat recovery heat exchanger 70, the flow rate adjusting valve 30, the heating return header 29, the secondary side heating pump 31, and the exhaust heat. By connecting the switching valve 32 with a pipe, an exhaust heat recovery circuit is formed. Further, the heating heat exchanger 26, the heating forward header 28, the user side heat exchanger 60 and the exhaust heat recovery heat exchanger 70, the flow rate adjusting valve 30, the secondary side heating pump 31, and the exhaust heat switching valve 32 are connected by piping. By being connected, a heating circuit is formed.

The hot water storage tank 21 stores water supplied from the outside through the water supply port 20a and hot water heated by the condenser 12. A tank water supply port 21a, a lower outflow port 21b, and a lower inflow port 21c are provided in the lower part of the hot water storage tank 21. An upper inflow port 21d and an upper outflow port 21e are provided above the hot water storage tank 21.

The tank water supply port 21a is connected to the water supply port 20a via the water supply pipe 20d. The lower outlet 21b is connected to the suction side of the boiling pump 22. The lower inflow port 21c is connected to the delivery side of the primary side heating pump 27. The upper inflow port 21d is connected to the outflow side of the water side flow path of the condenser 12 in the heat pump unit 10 via the hot water supply pipe 20e and the hot water outlet pipe 2. Further, the upper inflow port 21d is also connected to the first inflow port 23a of the general hot water supply mixing valve 23 and the first inflow port 24a of the bath hot water supply mixing valve 24 via the hot water supply pipe 20f. The upper outflow port 21e is connected to the inflow side of the primary side flow path in the heating heat exchanger 26 via the hot water introduction pipe 20g.

Since the hot water storage tank 21 is provided with various inflow outlets as described above, low temperature water is supplied to the lower part and hot water is supplied to the upper part. As a result, a layer having a temperature ranging from a high temperature range to a low temperature range is formed inside the hot water storage tank 21 from the upper part to the lower part. That is, the temperature of the hot water stored in the hot water storage tank 21 decreases from the upper part to the lower part.

The boiling pump 22 is driven by a motor (not shown) to deliver the water or hot water flowing out of the hot water storage tank 21 and supply it to the water side flow path of the condenser 12. The rotation speed of the boiling pump 22 is controlled by the hot water storage unit controller 9, which will be described later, so that the temperature of the hot water flowing out of the condenser 12 becomes the target hot water storage temperature.

The general hot water supply mixing valve 23 is, for example, a three-way valve, and has a first inflow port 23a, a second inflow port 23b, and an outflow port 23c. The general hot water supply mixing valve 23 mixes the hot water flowing into the first inflow port 23a with the water flowing into the second inflow port 23b and causes them to flow out from the outflow port 23c. The general hot water supply mixing valve 23 is controlled by the hot water storage unit controller 9. The first inflow port 23a is connected to the upper inflow port 21d via the hot water supply pipe 20f. The second inflow port 23b is connected to the water supply port 20a. The outlet 23c is connected to the general hot water supply port 20b.

The bath hot water supply mixing valve 24 is, for example, a three-way valve, and has a first inflow port 24a, a second inflow port 24b, and an outflow port 24c. The bath hot water supply mixing valve 24 mixes the hot water flowing into the first inflow port 24a with the water flowing into the second inflow port 24b and causes them to flow out from the outflow port 24c. The bath hot water supply mixing valve 24 is controlled by the hot water storage unit controller 9. The first inflow port 24a is connected to the upper inflow port 21d via the hot water supply pipe 20f. The second inflow port 24b is connected to the water supply port 20a. The outlet 24c is connected to the hot water filling on-off valve 25.

The hot water filling on-off valve 25 is provided to open and close the flow path when filling the bathtub 102 with hot water. The hot water filling on-off valve 25 is controlled by the hot water storage unit controller 9. The inflow side of the hot water filling on-off valve 25 is connected to the outlet 24c of the bath hot water supply mixing valve 24. The outflow side of the hot water filling on-off valve 25 is connected to the bath hot water supply port 20c.

The heating heat exchanger 26 exchanges heat between the hot water flowing through the primary side flow path and the hot water flowing through the secondary side flow path. The inflow side of the primary side flow path is connected to the upper outlet 21e of the hot water storage tank 21 via the hot water introduction pipe 20 g. The outflow side of the primary side flow path is connected to the suction side of the primary side heating pump 27 via the hot water outlet pipe 20h. The inflow side of the secondary side flow path is connected to the first outlet 32b of the exhaust heat switching valve 32. The outflow side of the secondary side flow path is connected to the inflow side of the heating going header 28.

The "primary side" indicates the hot water storage tank 21 side, and the "secondary side" indicates the user side heat exchanger 60 side. Therefore, for example, "primary side hot water" means hot water stored in the hot water storage tank 21, and "secondary side hot water" means hot water flowing through the user side heat exchanger 60.

The primary side heating pump 27 is driven by a motor (not shown) and sends out hot water flowing out from the primary side flow path of the heating heat exchanger 26 to the lower inflow port 21c of the hot water storage tank 21 via the hot water outlet pipe 20h. .. The rotation speed of the primary side heating pump 27 is controlled by, for example, the hot water storage unit controller 9 so that the hot water flow rate on the secondary side and the hot water flow rate on the primary side are substantially equal to each other.

The heating header 28 is provided to branch and flow out the inflowing hot water. The inflow side of the heating forward header 28 is connected to the outflow side of the secondary side flow path in the heating heat exchanger 26. Further, the inflow side of the heating forward header 28 is also connected to the hot water side flow path of the intermediate pressure heat exchanger 16 in the heat pump unit 10 via the waste heat return pipe 5. The outflow side of the heating going header 28 is connected to the inflow side of each of the utilization side heat exchanger 60 and the waste heat recovery heat exchanger 70 via the heating going pipe 6.

The heating return header 29 is provided to collect and discharge the hot water flowing in from each of the plurality of flow paths. The inflow side of the heating return header 29 is connected to the outflow side of each of the utilization side heat exchanger 60 and the waste heat recovery heat exchanger 70 via a plurality of heating return pipes 7 and a flow rate adjusting valve 30. The outflow side of the heating return header 29 is connected to the suction side of the secondary side heating pump 31.

The flow rate adjusting valve 30 is provided to adjust the flow rate of hot water flowing through the user side heat exchanger 60 or the waste heat recovery heat exchanger 70. The opening degree of the flow rate adjusting valve 30 is controlled by the hot water storage unit controller 9 so that the difference between the inlet water temperature and the outlet water temperature of the user side heat exchanger 60 becomes a set temperature difference, for example. The flow rate adjusting valve 30 is provided between the outflow side of the utilization side heat exchanger 60 or the waste heat recovery heat exchanger 70 and the inflow side of the heating return header 29, respectively.

The secondary side heating pump 31 is driven by a motor (not shown) and sends out the hot water flowing out from the heating return header 29 to the inflow port 32a of the exhaust heat switching valve 32. The rotation speed of the secondary side heating pump 31 is the heat exchanger having the largest hot water flow rate among the user side heat exchanger 60 and the waste heat recovery heat exchanger 70 connected to the hot water storage unit 20 by the hot water storage unit controller 9. It is controlled according to. That is, the rotation speed of the secondary side heating pump 31 is adjusted so that the flow rate adjusting valve 30 having the largest opening among the plurality of flow rate adjusting valves 30 has the maximum opening.

The exhaust heat switching valve 32 is, for example, a three-way valve, and has an inflow port 32a, a first outflow port 32b, and a second outflow port 32c. The exhaust heat switching valve 32 causes the hot water flowing into the inflow port 32a to flow out from either the first outlet 32b or the second outlet 32c. The waste heat switching valve 32 is controlled by the hot water storage unit controller 9. The inflow port 32a is connected to the delivery side of the secondary side heating pump 31. The first outlet 32b is connected to the inflow side of the secondary side flow path in the heating heat exchanger 26. The second outlet 32c is connected to the hot water side flow path of the intermediate pressure heat exchanger 16 in the heat pump unit 10 via the waste heat discharge pipe 4.

Further, the hot water storage unit 20 includes a hot water storage temperature sensor 51, a heating forward temperature sensor 52, and a heating return temperature sensor 53. The hot water storage temperature sensor 51 is composed of a plurality of temperature sensors installed in the height direction of the surface of the hot water storage tank 21. Each hot water storage temperature sensor 51 detects the temperature of water or hot water stored in the hot water storage tank 21 existing at the installed height.

The heating forward temperature sensor 52 is provided on the inflow side of the heating forward header 28, and detects the inlet temperature of the hot water flowing into the user side heat exchanger 60 and the exhaust heat recovery heat exchanger 70. The heating return temperature sensor 53 is provided on the inflow side of the heating return header 29, and detects the outlet temperature of the hot water flowing out from the user side heat exchanger 60 and the exhaust heat recovery heat exchanger 70.

Further, the hot water storage unit 20 includes a hot water storage unit controller 9. The hot water storage unit controller 9 is a unit provided in the hot water storage unit 20 based on various operation modes performed by the hot water supply / heating device 1 and detection results by the hot water storage temperature sensor 51, the heating forward temperature sensor 52, and the heating return temperature sensor 53. To control. The hot water storage unit controller 9 is connected to the heat pump controller 8, the hot water supply remote controller 40, and the heating remote controller 50.

FIG. 4 is a functional block diagram showing an example of the configuration of the hot water storage unit controller 9 of FIG. As shown in FIG. 4, the hot water storage unit controller 9 includes an information acquisition unit 91, a comparison calculation unit 92, an equipment control unit 93, a communication unit 94, and a storage unit 95. The hot water storage unit controller 9 is configured with hardware such as a circuit device that realizes various functions by executing software on an arithmetic unit such as a microcomputer.

The information acquisition unit 91 acquires information detected by various sensors such as the hot water storage temperature sensor 51, the heating forward temperature sensor 52, and the heating return temperature sensor 53. For example, the information acquisition unit 91 acquires the tank temperature at each position of the hot water storage tank 21 detected by the hot water storage temperature sensor 51.

The comparison calculation unit 92 has a process of comparing various information acquired by the information acquisition unit 91 with the information stored in the storage unit 95 corresponding to each information, and a process of determining according to the comparison result. I do. Further, the comparison calculation unit 92 performs calculation processing such as calculating the amount of hot water stored in the hot water storage tank 21 based on the tank temperature detected by the hot water storage temperature sensor 51.

The equipment control unit 93 has a boiling pump 22, a general hot water supply mixing valve 23, a bath hot water supply mixing valve 24, a hot water filling on-off valve 25, a primary side heating pump 27, and a flow rate, depending on the judgment result of the comparison calculation unit 92 and the like. The control valve 30, the secondary side heating pump 31 and the exhaust heat switching valve 32 are controlled. The communication unit 94 transmits / receives various information to / from the heat pump controller 8, the hot water supply remote controller 40, and the heating remote controller 50.

The storage unit 95 stores various values used in each unit of the hot water storage unit controller 9 in advance. Specifically, the storage unit 95 stores the boiling threshold value, the set waste heat recovery recoverable temperature, the set hot water amount, the set heat storage temperature, and the like used in the comparison calculation unit 92. The boiling threshold value indicates the minimum amount of hot water stored in the hot water storage tank 21. The set waste heat recoveryable temperature is a reference value for recovering waste heat in the waste heat recovery target space. The set amount of hot water indicates the amount of hot water supplied to the bathtub 102 during the bath hot water supply operation. The set heat storage temperature is a reference value when heat is stored in the waste heat recovery target space during the skeleton heat storage operation. Further, the storage unit 95 stores various information received via the communication unit 94.

The hot water supply remote controller 40 is operated by the user to set the hot water supply operation of the hot water supply heating device 1. For example, by operating the hot water supply remote controller 40 by the user, the hot water supply temperature during the hot water supply operation and the amount of hot water in the bathtub 102 are set. Further, by operating the hot water supply remote controller 40, the operation using the waste heat recovery and the user-side heat exchanger 60 to be the waste heat recovery target at the time of the operation are set.

The hot water supply remote controller 40 is provided with a communication means for communicating, and sends and receives various set information and the like to and from the hot water storage unit controller 9. Further, the hot water supply remote controller 40 is provided with a notification means such as a display device or a voice output device, and can notify the user of various information such as the hot water supply set temperature by using the notification means.

The heating remote controller 50 is operated by the user to set the heating operation of the hot water supply heating device 1. For example, the heating remote controller 50 is operated by the user to set the room temperature during the heating operation.

The heating remote controller 50 is provided with a communication means for communicating, and transmits / receives various set information and the like to / from the hot water storage unit controller 9. Further, the heating remote controller 50 is provided with a notification means such as a display device or a voice output device, and can notify the user of various information such as the room temperature by using the notification means.

(User side heat exchanger 60)
The user-side heat exchanger 60 is provided in the heating device 103 of FIG. 1, and heat is exchanged between the hot water flowing in through the heating going pipe 6 and the indoor air such as the living room 100a to heat the hot water. Dissipates heat to the indoor air. A user-side temperature sensor 61 is provided in the vicinity of the user-side heat exchanger 60. The user-side temperature sensor 61 detects the temperature of an indoor space such as a living room 100a.

(Waste heat recovery heat exchanger 70)
The waste heat recovery heat exchanger 70 is provided in the waste heat recovery indoor unit 104 of FIG. 1, and heat is exchanged between the hot water flowing in through the heating going pipe 6 and the air in the non-living space 100d. , The heat of hot water is radiated to the air of the non-living space 100d. A temperature sensor 71 on the waste heat recovery side is provided in the vicinity of the waste heat recovery heat exchanger 70. The waste heat recovery side temperature sensor 71 detects the temperature of the space of the non-living space 100d.

[Operation of hot water supply / heating device 1]
Next, the operation of the hot water supply / heating device 1 having the above configuration will be described. In the hot water supply / heating device 1 according to the first embodiment, a hot water storage operation, a heating operation, a general hot water supply operation, a bath hot water supply operation, and a skeleton heat storage operation are performed. The various operations described below are performed by operating the hot water supply remote controller 40 and the heating remote controller 50 by the user.

(Hot water storage operation)
The hot water storage operation by the hot water supply / heating device 1 will be described with reference to FIG. The hot water storage operation is an operation in which low-temperature water is boiled to a high temperature by a heat pump and the boiled water is stored in the hot water storage tank 21. The hot water storage operation is mainly carried out at a preset time zone such as a midnight time zone. It is also carried out when the amount of hot water supplied is large in the evening or at night and the amount of remaining hot water in the hot water storage tank 21 is small.

During the hot water storage operation, the hot water supply remote controller 40 determines the hot water storage temperature of the hot water storage tank 21 according to the hot water supply set temperature set by the user's operation or the like. The hot water storage temperature is, for example, 65 ° C. The hot water supply remote controller 40 transmits the hot water storage temperature determined based on the set hot water supply set temperature to the hot water storage unit controller 9.

When the hot water storage temperature is received by the communication unit 94 of the hot water storage unit controller 9, the hot water storage unit controller 9 stores the received hot water storage temperature in the storage unit 95 as the target hot water storage temperature. Then, the device control unit 93 controls the rotation speed of the boiling pump 22 so that the hot water discharge temperature of the condenser 12 received by the communication unit 94 via the communication unit 94 becomes the target hot water storage temperature. ..

Further, the comparison calculation unit 92 compares the detection result of the hot water storage temperature sensor 51 with the boiling threshold value set in advance and stored in the storage unit 95, and the hot water storage amount of the hot water storage tank 21 is lower than the preset boiling threshold value. If so, the hot water storage operation is started. At this time, the hot water storage unit controller 9 commands the heat pump controller 8 to the target boiling temperature, which is the hot water storage temperature, via the communication unit 94.

When the hot water storage operation is started, in the heat pump unit 10, the low temperature and low pressure refrigerant is compressed by the compressor 11 and discharged as a high temperature and high pressure gas refrigerant. The high-temperature and high-pressure gas refrigerant discharged from the compressor 11 flows into the condenser 12, exchanges heat with the water flowing through the boiling circuit, condenses while radiating heat, becomes a high-pressure liquid refrigerant, and flows out of the condenser 12. do.

The high-pressure liquid refrigerant flowing out of the condenser 12 is depressurized by the first expansion valve 13 to become a low-temperature low-pressure gas-liquid two-phase refrigerant. The low-temperature low-pressure gas-liquid two-phase refrigerant flows into the evaporator 14, exchanges heat with the outdoor air taken in by the blower 17, absorbs heat and evaporates, becomes a low-pressure gas refrigerant, and is sucked into the compressor 11.

At this time, the equipment control unit 83 of the heat pump controller 8 controls each unit of the heat pump unit 10 based on the target boiling temperature received from the hot water storage unit controller 9 via the communication unit 84. Specifically, the device control unit 83 controls the operating frequency of the compressor 11 so that the heating capacity becomes a preset set capacity value. Further, the device control unit 83 causes the compressor 11 to have a preset superheat degree of the refrigerant on the suction side, or the discharge temperature of the compressor 11 to have a preset set temperature. In addition, the opening degree of the first expansion valve 13 is controlled.

When performing the hot water storage operation, the equipment control unit 83 controls to close the second expansion valve 15. That is, during the hot water storage operation, the refrigerant does not flow to the second expansion valve 15 and the intermediate pressure heat exchanger 16.

On the other hand, in the hot water storage unit 20, the equipment control unit 93 drives the boiling pump 22. As a result, the low-temperature water existing in the lower part of the hot water storage tank 21 flows out from the lower outlet 21b and is sucked into the suction side of the boiling pump 22. The water sucked into the boiling pump 22 is pressurized and sent, and flows into the condenser 12 via the water inlet pipe 3.

The water flowing into the condenser 12 exchanges heat with the refrigerant flowing in the flow path on the refrigerant side to become hot water, and flows out from the condenser 12. The hot water flowing out of the condenser 12 flows into the upper inflow port 21d of the hot water storage tank 21 via the hot water outlet pipe 2.

In this way, the hot water storage operation is continued until the hot water storage amount of the hot water storage tank 21 reaches a preset target hot water storage amount. The target hot water storage amount at this time is calculated from, for example, the difference between the hot water supply load predicted from the present to the preset set time and the hot water storage amount of the current hot water storage tank 21. The hot water load may be determined, for example, by learning the hot water load for the past few days.

When the amount of hot water stored in the hot water storage tank 21 reaches the target amount of hot water stored, the hot water storage unit controller 9 stops the hot water storage operation.

(Heating operation)
The heating operation by the hot water supply heating device 1 will be described with reference to FIG. In the heating operation, heat is exchanged between the hot water on the primary side, which is the hot water stored in the hot water storage tank 21, and the hot water on the secondary side flowing through the heat exchanger 60 on the user side, so that the living room 100a in FIG. 1a It is an operation to heat etc. In the following, a case of heating a plurality of living rooms 100a shown in FIG. 1 will be described as an example. That is, it is assumed that the user-side heat exchanger 60 corresponding to the heating equipment 103 of the plurality of living rooms 100a is connected to the hot water supply heating device 1 shown in FIG.

When the room temperature of the living room 100a is set by the operation of the heating remote controller 50 by the user during the heating operation, the heating remote controller 50 transmits the set indoor temperature to the hot water storage unit controller 9. When the indoor temperature is received by the communication unit 94 of the hot water storage unit controller 9, the hot water storage unit controller 9 stores the received set indoor temperature in the storage unit 95.

The equipment control unit 93 controls the exhaust heat switching valve 32 so that the inflow port 32a of the exhaust heat switching valve 32 and the first outlet 32b communicate with each other. Further, the device control unit 93 opens the flow rate adjusting valve 30 so as to adjust the flow rate of the hot water on the secondary side flowing through the user side heat exchanger 60 corresponding to each of the heating devices 103 provided in each living room 100a. Control the degree. For example, the device control unit 93 determines the difference between the inlet water temperature of the user-side heat exchanger 60 detected by the heating forward temperature sensor 52 and the outlet water temperature detected by the heating return temperature sensor 53 based on the set indoor temperature. The opening degree of the flow rate adjusting valve 30 is adjusted so as to have a set temperature difference.

Further, the equipment control unit 93 controls the rotation speed of the secondary side heating pump 31 according to the hot water flow rate of the user side heat exchanger 60 having the largest hot water flow rate among the plurality of user side heat exchangers 60. That is, the device control unit 93 sets the opening degree of the flow rate adjusting valve 30 having the largest opening degree to be the maximum opening degree among the plurality of flow rate adjusting valves 30 corresponding to each of the plurality of user-side heat exchangers 60. The rotation speed of the secondary heating pump 31 is controlled. Furthermore, the device control unit 93 is primary so that the flow rate of the hot water on the secondary side flowing through the secondary side flow path and the flow rate of the hot water on the primary side flowing through the primary side flow path are substantially the same. The rotation speed of the side heating pump 27 is controlled.

Further, the device control unit 93 controls the opening degree of the flow rate adjusting valve 30 based on the temperature of the indoor space detected by the user-side temperature sensor 61 and the set indoor temperature. For example, the device control unit 93 sets the opening degree of the flow rate adjusting valve 30 to the minimum opening degree when the temperature of the indoor space becomes equal to or higher than the set indoor temperature.

When the heating operation is started, in the hot water storage unit 20, the hot water on the primary side stored in the hot water storage tank 21 flows out from the upper outlet 21e, and the hot water on the primary side of the heating heat exchanger 26 flows through the hot water introduction pipe 20 g. It flows into the flow path. The hot water on the primary side that has flowed into the heating heat exchanger 26 exchanges heat with the hot water on the secondary side that flows through the secondary side flow path, and is cooled. The cooled hot water on the primary side flows out from the heating heat exchanger 26, is sucked into the primary side heating pump 27 via the hot water outlet pipe 20h, is pressurized, and flows into the lower inflow port 21c of the hot water storage tank 21. do.

On the other hand, the hot water on the secondary side is heated by exchanging heat with the hot water on the primary side in the heating heat exchanger 26. The hot water on the secondary side that has been heated and flows out from the heating heat exchanger 26 branches at the heating going header 28 and flows into each user side heat exchanger 60 via the heating going pipe 6, respectively. The hot water on the secondary side that has flowed into the heat exchanger 60 on the user side exchanges heat with the indoor air in the living room 100a and is cooled. As a result, the indoor air is heated.

The hot water on each secondary side that has been cooled and flows out from each user-side heat exchanger 60 flows into the heating return header 29 via the heating return pipe 7 and the flow rate adjusting valve 30 and is aggregated. The aggregated hot water on the secondary side is sucked into the secondary side heating pump 31 and pressurized, and flows into the secondary side flow path of the heating heat exchanger 26 via the waste heat switching valve 32.

When the exhaust heat recovery heat exchanger 70 is connected to the hot water supply / heating device 1, the device control unit 93 sets the opening degree of the flow rate adjusting valve 30 corresponding to the exhaust heat recovery heat exchanger 70 to the “closed” state. It is preferable to prevent hot water on the secondary side from flowing into the waste heat recovery heat exchanger 70.

(General hot water supply operation)
The general hot water supply operation by the hot water supply heating device 1 will be described with reference to FIG. The general hot water supply operation is an operation for supplying hot water from the hot water supply end 101 such as a shower or a faucet shown in FIG.

When the hot water supply temperature is set by the user operating the hot water supply remote controller 40 or the like during the general hot water supply operation, the hot water supply remote controller 40 transmits the set hot water supply temperature to the hot water storage unit controller 9. When the set hot water supply temperature is received by the communication unit 94 of the hot water storage unit controller 9, the hot water storage unit controller 9 stores the received set hot water supply temperature in the storage unit 95. Based on the set hot water supply temperature, the device control unit 93 sets the temperature of the hot water supplied from the general hot water supply port 20b to the set hot water supply temperature of the first inflow port 23a and the second inflow port 23b of the general hot water supply mixing valve 23. Adjust the opening.

FIG. 5 is a flowchart showing an example of the flow of general hot water supply processing by the hot water supply / heating device 1 according to the first embodiment. In the following, it is assumed that the hot water storage unit controller 9 measures, for example, the flow rate of hot water flowing out from the general hot water supply port 20b with a flow rate sensor (not shown) or the like during the general hot water supply operation.

In step S1, the comparison calculation unit 92 of the hot water storage unit controller 9 compares the hot water supply flow rate of the hot water flowing out from the general hot water supply port 20b with the preset set flow rate, and determines whether the hot water supply flow rate is equal to or higher than the set flow rate. To judge. As a result of the determination, when the hot water supply flow rate is less than the set flow rate (step S1; No), the process returns to step S1.

On the other hand, when the hot water supply flow rate is equal to or higher than the set flow rate (step S1; Yes), the device control unit 93 controls the opening degree of the general hot water supply mixing valve 23 in step S2. Specifically, the device control unit 93 adjusts the opening degrees of the first inflow port 23a and the second inflow port 23b of the general hot water supply mixing valve 23 so that the hot water supply temperature becomes the set hot water supply temperature, and from the hot water storage tank 21. The mixing ratio of the hot water of the water supply port 20a and the water from the water supply port 20a is adjusted.

In step S3, the comparison calculation unit 92 compares the hot water supply flow rate of the hot water flowing out from the general hot water supply port 20b with the set flow rate, and determines whether or not the hot water supply flow rate is less than the set flow rate. As a result of the determination, when the hot water supply flow rate is less than the set flow rate (step S3; Yes), the general hot water supply process ends. On the other hand, when the hot water supply flow rate is equal to or higher than the set flow rate (step S3; No), the process returns to step S2.

As described above, in the general hot water supply operation, hot water having a set hot water supply temperature is supplied using the hot water stored in the hot water storage tank 21.

(Bath hot water supply operation)
The bath hot water supply operation by the hot water supply heating device 1 will be described. In the first embodiment, the bath hot water supply operation is performed in any of the normal bath hot water supply mode and the waste heat recovery bath hot water supply mode.

The normal bath hot water supply mode is a mode in which hot water heated by a heat pump is used as hot water at the time of filling with hot water. In the waste heat recovery bath hot water supply mode, the heat of the waste heat recovery target space is recovered as waste heat during the bath hot water supply operation, and the recovered waste heat is used by the heat pump to assist the bath hot water supply. This is a mode to improve the speed.

When the bath hot water supply operation is performed, for example, using the hot water supply remote controller 40, the selection or non-selection of the waste heat recovery bath hot water supply mode is set in advance by the user's operation. Not limited to this, the heating remote controller 50 may be used to set the selection or non-selection of the waste heat recovery bath hot water supply mode. Further, when the waste heat recovery bath hot water supply mode is selected, the heat exchanger to be the target of waste heat recovery is set in advance by the operation of the heating remote controller 50 by the user. For example, when the exhaust heat recovery heat exchanger 70 is connected to the hot water supply / heating device 1, the exhaust heat recovery heat exchanger 70 may be set as the heat exchanger to be the target of exhaust heat recovery. .. When the exhaust heat recovery heat exchanger 70 is not connected to the hot water supply / heating device 1, for example, the user-side heat exchanger 60 corresponding to the indoor unit provided in the unused living room 100a is the target of exhaust heat recovery. It should be set as a heat exchanger.

When performing the bath hot water supply operation, the mode to be used is determined based on these settings. Hereinafter, the mode selection during the bath hot water supply operation will be described with reference to the flowchart of FIG. FIG. 6 is a flowchart showing an example of the flow of the mode selection process during the bath hot water supply operation by the hot water supply / heating device 1 according to the first embodiment.

In step S11, the hot water storage unit controller 9 determines whether or not the bathtub 102 (see FIG. 1) is instructed to fill with hot water based on the operation of the hot water supply remote controller 40 by the user. As a result of the determination, if the hot water filling is not commanded, the process returns to step S11, and the process of step S11 is repeated until the hot water filling is commanded.

On the other hand, when the hot water filling is instructed (step S11; Yes), the hot water storage unit controller 9 determines whether or not the waste heat recovery bath hot water supply mode is selected in step S12. When the exhaust heat recovery bath hot water supply mode is selected (step S12; Yes), in step S13, the temperature of the target space by the utilization side temperature sensor 61 or the exhaust heat recovery side temperature sensor 71 of the exhaust heat recovery target space is set. Detected. If the waste heat recovery bath hot water supply mode is not selected (step S12; No), the process proceeds to step S16.

In step S14, the comparison calculation unit 92 compares the temperature of the space detected in step S13 with the set waste heat recoverable temperature preset and stored in the storage unit 95, and the space temperature can be set and the waste heat can be recovered. Determine if it is above temperature. The set waste heat recoveryable temperature is, for example, preferably 20 ° C. or higher, and more preferably about 23 ° C.

As a result of the determination, when the space temperature is equal to or higher than the set waste heat recovery recoverable temperature (step S14; Yes), the bath hot water supply operation in the waste heat recovery bath hot water supply mode is performed in step S15. On the other hand, when the space temperature is lower than the set waste heat recovery recoverable temperature (step S14; No), the bath hot water supply operation in the normal bath hot water supply mode is performed in step S16.

(Bath hot water supply operation by normal bath hot water supply mode)
The bath hot water supply operation in the normal bath hot water supply mode by the hot water supply heating device 1 will be described. Here, it is assumed that the waste heat recovery bath hot water supply mode is not selected as the mode during the bath hot water supply operation by the user operating the hot water supply remote controller 40 or the like.

When the hot water filling temperature is set by the user operating the hot water supply remote controller 40 or the like during the bath hot water supply operation in the normal hot water supply mode, the hot water supply remote controller 40 transmits the set hot water filling temperature to the hot water storage unit controller 9. When the set hot water filling temperature is received by the communication unit 94 of the hot water storage unit controller 9, the hot water storage unit controller 9 stores the received set hot water filling temperature in the storage unit 95. The device control unit 93 sets the first inflow port 24a and the second inflow port of the bath hot water supply mixing valve 24 so that the temperature of the hot water supplied from the bath hot water supply port 20c becomes the set hot water filling temperature based on the set hot water filling temperature. Adjust the opening degree of 24b.

Further, the hot water storage unit controller 9 transmits information indicating a command for bath hot water supply operation in the normal bath hot water supply mode to the heat pump controller 8. When the communication unit 84 receives information indicating a command for bath water supply operation in the normal bath water supply mode in the heat pump controller 8, the equipment control unit 83 controls each unit in the heat pump unit 10 in order to perform the heat pump operation. .. At this time, the opening degree of the second expansion valve 15 is controlled by the equipment control unit 83 so as to have the minimum opening degree. As a result, no refrigerant flows through the second expansion valve 15 and the intermediate pressure heat exchanger 16.

Further, the device control unit 93 of the hot water storage unit controller 9 controls the hot water filling on-off valve 25 to be “open”. At this time, the hot water flowing out from the hot water storage tank 21 and the hot water boiled by the condenser 12 of the heat pump unit 10 are supplied to the first inflow port 24a of the bath hot water supply mixing valve 24 via the hot water supply pipe 20f. To.

FIG. 7 is a flowchart showing an example of the flow of the bath hot water supply process in the normal bath hot water supply mode by the hot water supply / heating device 1 according to the first embodiment. When the bath hot water supply operation in the normal bath hot water supply mode is started, in step S21, the equipment control unit 83 of the heat pump controller 8 controls each part in the heat pump unit 10 to perform the heat pump operation. The equipment control unit 93 of the hot water storage unit controller 9 drives the boiling pump 22 in step S22. Further, the device control unit 93 sets the hot water filling on-off valve 25 in the “open” state in step S23.

In step S24, the equipment control unit 93 controls the opening degree of the bath hot water supply mixing valve 24 to adjust the boiling temperature of the hot water supplied to the bathtub 102 (see FIG. 1). Specifically, the equipment control unit 93 adjusts the opening degrees of the first inflow port 24a and the second inflow port 24b of the bath hot water supply mixing valve 24 so that the boiling temperature becomes the set boiling temperature. That is, the device control unit 93 adjusts the mixing ratio of the hot water from the hot water storage tank 21 flowing through the hot water supply pipe 20f, the hot water boiled by the condenser 12, and the water from the water supply port 20a.

In step S25, the comparison calculation unit 92 compares the amount of hot water in the bathtub 102 with the amount of hot water set in advance and stored in the storage unit 95, and determines whether or not the amount of hot water in the bathtub is equal to or greater than the set amount of hot water. Here, the amount of hot water in the bathtub is determined by using, for example, a hot water supply flow rate sensor (not shown) that measures the flow rate of hot water flowing out from the bath hot water supply port 20c, or a water level sensor (not shown) that is provided in the bathtub 102 and measures the amount of stored hot water. Judged.

As a result of the determination, when the amount of hot water in the bathtub is less than the set amount of hot water (step S25; No), the process returns to step S24, and the processes of steps S24 and S25 are repeated until the amount of hot water in the bathtub reaches the set amount of hot water. On the other hand, when the amount of hot water in the bathtub is equal to or greater than the set amount of hot water (step S25; Yes), the device control unit 93 sets the hot water filling on-off valve 25 in the “closed” state in step S26.

Further, in step S27, the equipment control unit 83 of the heat pump controller 8 controls each unit in the heat pump unit 10 so as to stop the heat pump operation. In step S28, the device control unit 93 of the hot water storage unit controller 9 stops the drive of the boiling pump 22.

As described above, in the bath hot water supply operation in the normal bath hot water supply mode, the hot water at the set boiling temperature is transferred to the bathtub 102 by using the hot water stored in the hot water storage tank 21 and the hot water boiled by the condenser 12. Hot water is supplied. As a result, the amount of hot water supplied to the bathtub 102 can be increased per hour as compared with the case where only the hot water stored in the hot water storage tank 21 is used.

(Bath hot water supply operation by waste heat recovery bath hot water supply mode)
The waste heat recovery bath hot water supply operation by the hot water supply heating device 1 in the hot water supply mode will be described with reference to FIG. Here, it is assumed that the waste heat recovery bath hot water supply mode is selected as the mode during the bath hot water supply operation by the user operating the hot water supply remote controller 40 or the like. Further, the waste heat recovery heat exchanger 70 of the waste heat recovery indoor unit 104 installed in the non-living space 100d is connected to the hot water supply / heating device 1, and the non-living space 100d is set as the waste heat recovery target space. It shall be. When the exhaust heat recovery heat exchanger 70 is not connected to the hot water supply / heating device 1, for example, the unused heat exchanger 60 on the user side may be used as the heat exchanger to be exhaust heat recovery.

When the hot water filling temperature is set by the user's operation on the hot water supply remote controller 40 or the like during the hot water supply operation in the waste heat recovery bath hot water supply mode, the hot water supply remote controller 40 transmits the set hot water filling temperature to the hot water storage unit controller 9.

When the set hot water filling temperature is received by the communication unit 94 of the hot water storage unit controller 9, the hot water storage unit controller 9 stores the received set hot water filling temperature in the storage unit 95. When the heating operation is being carried out, the equipment control unit 93 stops the heating operation and sets the exhaust heat switching valve 32 so that the inflow port 32a and the second outflow port 32c of the exhaust heat switching valve 32 communicate with each other. Control. Further, the device control unit 93 sets the first inflow port 24a and the second inlet 24a of the bath hot water supply mixing valve 24 so that the temperature of the hot water supplied from the bath hot water supply port 20c becomes the set hot water filling temperature based on the set hot water filling temperature. Adjust the opening degree of the inflow port 24b.

The hot water storage unit controller 9 transmits information indicating a command for bath hot water supply operation in the waste heat recovery bath hot water supply mode to the heat pump controller 8. When the communication unit 84 receives information indicating a command for the bath hot water supply operation in the waste heat recovery bath hot water supply mode in the heat pump controller 8, the device control unit 83 sets each part in the heat pump unit 10 to perform the heat pump operation. Control. At this time, the second expansion valve 15 is controlled by the device control unit 83 so that the opening degree is in the “open” state. As a result, the refrigerant flows through the second expansion valve 15 and the intermediate pressure heat exchanger 16.

Further, the device control unit 93 of the hot water storage unit controller 9 controls the hot water filling on-off valve 25 to be “open”. At this time, the hot water flowing out from the hot water storage tank 21 and the hot water boiled by the condenser 12 of the heat pump unit 10 are supplied to the first inflow port 24a of the bath hot water supply mixing valve 24 via the hot water supply pipe 20f. To.

When the bath hot water supply operation in the waste heat recovery bath hot water supply mode is started, the refrigerant flows in the refrigerant circuit in the heat pump unit 10 in the same manner as in the hot water storage operation. Further, in this bath hot water supply operation, the equipment control unit 83 of the heat pump controller 8 controls the second expansion valve 15 so as to be in the “open” state. That is, during the bath hot water supply operation in the waste heat recovery bath hot water supply mode, the refrigerant flows through the second expansion valve 15 and the intermediate pressure heat exchanger 16.

Therefore, the refrigerant cooled by the condenser 12 also flows into the second expansion valve 15, is depressurized to medium temperature and medium pressure, and flows out from the second expansion valve 15. At this time, the opening degree of the second expansion valve 15 is controlled by the equipment control unit 83 so that the superheat degree of the refrigerant flowing into the intermediate pressure portion of the compressor 11 becomes a preset superheat degree.

The medium-temperature and medium-pressure refrigerant flowing out of the second expansion valve 15 flows into the refrigerant-side flow path of the intermediate pressure heat exchanger 16. The refrigerant that has flowed into the refrigerant side flow path of the intermediate pressure heat exchanger 16 exchanges heat with the hot water that has flowed into the hot water side flow path via the exhaust heat transfer pipe 4, and is heated and evaporated. The refrigerant flowing out of the intermediate pressure heat exchanger 16 flows into the intermediate pressure portion of the compressor 11 and merges with the refrigerant compressed in the low pressure side compression chamber 11a to become the intermediate pressure. Then, the intermediate pressure refrigerant is further compressed in the high pressure side compression chamber 11b to become a high pressure refrigerant.

On the other hand, the hot water on the secondary side of the hot water storage unit 20 flows into the hot water side flow path of the intermediate pressure heat exchanger 16 in the heat pump unit 10 via the waste heat discharge pipe 4. The hot water flowing into the intermediate pressure heat exchanger 16 exchanges heat with the refrigerant flowing into the refrigerant side flow path, is cooled, and flows out from the intermediate pressure heat exchanger 16. The hot water flowing out of the intermediate pressure heat exchanger 16 flows into the exhaust heat recovery heat exchanger 70 via the exhaust heat return pipe 5, the heating going header 28, and the heating going pipe 6.

The hot water flowing into the waste heat recovery heat exchanger 70 exchanges heat with the air in the non-living space 100d, is heated, and flows out from the waste heat recovery heat exchanger 70. Further, this cools the air in the non-living space 100d. The hot water flowing out of the waste heat recovery heat exchanger 70 is sucked into the secondary heating pump 31 via the heating return pipe 7, the flow rate adjusting valve 30, and the heating return header 29 and is pressurized. Then, the hot water flowing out from the secondary side heating pump 31 flows to the waste heat discharge pipe 4 via the waste heat switching valve 32.

At this time, the device control unit 93 of the hot water storage unit controller 9 determines the secondary side heating pump 31 so that the difference between the inlet water temperature and the outlet water temperature of the waste heat recovery heat exchanger 70 becomes a preset set temperature difference. And the opening degree of the flow rate adjusting valve 30 are adjusted.

FIG. 8 is a flowchart showing an example of the flow of the bath hot water supply process in the waste heat recovery bath hot water supply mode by the hot water supply / heating device 1 according to the first embodiment. When the bath hot water supply operation in the waste heat recovery bath hot water supply mode is started, in step S31, the equipment control unit 93 of the hot water storage unit controller 9 communicates with the inflow port 32a of the waste heat switching valve 32 and the second outflow port 32c. As a result, the exhaust heat switching valve 32 is controlled.

In step S32, the equipment control unit 83 of the heat pump controller 8 controls each unit in the heat pump unit 10 to operate the heat pump. Further, the device control unit 93 of the hot water storage unit controller 9 drives the boiling pump 22 and the secondary heating pump 31 in steps S33 to S35, respectively, and sets the hot water filling on-off valve 25 to the “open” state.

In step S36, the equipment control unit 93 controls the opening degree of the bath hot water supply mixing valve 24 to adjust the boiling temperature of the hot water supplied to the bathtub 102 (see FIG. 1). Specifically, the equipment control unit 93 adjusts the opening degrees of the first inflow port 24a and the second inflow port 24b of the bath hot water supply mixing valve 24 so that the boiling temperature becomes the set boiling temperature. That is, the device control unit 93 adjusts the mixing ratio of the hot water from the hot water storage tank 21 flowing through the hot water supply pipe 20f, the hot water boiled by the condenser 12, and the water from the water supply port 20a.

In step S37, the comparison calculation unit 92 determines whether or not the various conditions during hot water supply satisfy the waste heat recovery continuation condition. In this case, the comparison calculation unit 92 determines that the waste heat recovery continuation condition is satisfied when none of the first to fourth conditions for terminating the waste heat recovery shown below is satisfied.

The first condition for ending the waste heat recovery is that, for example, the user operates the hot water supply remote controller 40 or the heating remote controller 50 to cancel the waste heat recovery bath hot water supply mode. The second condition for ending the waste heat recovery is that the temperature of the waste heat recovery target space is equal to or lower than the preset waste heat recovery end temperature of about 15 ° C. The third condition for terminating the waste heat recovery is that the outlet water temperature of the waste heat recovery heat exchanger 70 is equal to or lower than the preset outlet temperature of about 10 ° C. The fourth condition for ending the waste heat recovery is that the inlet water temperature of the waste heat recovery heat exchanger 70 is equal to or lower than the preset inlet temperature of about 15 ° C.

As a result of the determination, when the waste heat recovery continuation condition is satisfied (step S37; Yes), the process proceeds to step S38. In step S38, the comparison calculation unit 92 compares the amount of hot water in the bathtub 102 with the amount of hot water set in advance and stored in the storage unit 95, and determines whether or not the amount of hot water in the bathtub is equal to or greater than the set amount of hot water. The amount of hot water in the bathtub is determined by using a hot water supply flow rate sensor, a water level sensor, or the like, as in the bath hot water supply operation in the normal bath hot water supply mode.

As a result of the determination, when the amount of hot water in the bathtub is less than the set amount of hot water (step S38; No), the process returns to step S36, and the processes of steps S36 to S38 are repeated until the amount of hot water in the bathtub reaches the set amount of hot water. On the other hand, when the amount of hot water in the bathtub is equal to or greater than the set amount of hot water (step S38; Yes), the device control unit 93 sets the hot water filling on-off valve 25 in the “closed” state in step S39.

Further, in step S40, the equipment control unit 83 of the heat pump controller 8 controls each unit in the heat pump unit 10 so as to stop the heat pump operation. Further, in steps S41 and S42, the equipment control unit 93 of the hot water storage unit controller 9 stops the driving of the boiling pump 22 and the secondary heating pump 31.

On the other hand, if the waste heat recovery continuation condition is not satisfied in step S37 (step S37; No), the device control unit 93 of the hot water storage unit controller 9 stops the drive of the secondary side heating pump 31 in step S43. .. Then, in step S44, the bath hot water supply operation in the normal bath hot water supply mode is continued, and the processes after step S24 in FIG. 7 are performed.

In this way, in the bath hot water supply operation in the waste heat recovery bath hot water supply mode, the hot water at the set boiling temperature is bathed using the hot water stored in the hot water storage tank 21 and the hot water boiled by the condenser 12. Hot water is supplied to 102. As a result, the amount of hot water supplied to the bathtub 102 can be increased per hour as compared with the case where only the hot water stored in the hot water storage tank 21 is used, as in the case of the bath hot water supply operation in the normal bath hot water supply mode.

Further, in the bath hot water supply operation in the waste heat recovery bath hot water supply mode, the refrigerant evaporates in both the condenser 12 and the intermediate pressure heat exchanger 16 by utilizing the exhaust heat of the waste heat recovery target space, and the intermediate pressure heat exchanger 16 is used. The refrigerant evaporated in 1 is introduced into the intermediate pressure portion of the compressor 11. Therefore, the flow rate of the refrigerant flowing through the condenser 12 can be increased, and the heating capacity can be improved as compared with the hot water storage operation. Further, in this case, since the heating circuit and the waste heat recovery circuit are branched by the waste heat switching valve 32, the flow path can be shared between the heating circuit and the waste heat recovery circuit.

(Hold heat storage operation)
The skeleton heat storage operation by the hot water supply / heating device 1 will be described. The skeleton heat storage operation is an operation of storing heat in a space such as a room which is a skeleton. The room to be heat-stored is, for example, a living space such as a non-living space 100d or a living room 100a. When the living space is a room to be heat-stored, heat is stored during the time when the space is not used. For example, a bedroom or the like is often absent during the daytime, so that heat can be stored in the room by using a heating device 103 such as floor heating during the absent time.

The condition for starting the skeleton heat storage operation is the time zone when the room to be heat storage is absent. The user-side heat exchanger 60 used for the skeleton heat storage operation and the time zone for performing the skeleton heat storage operation can be set by using, for example, a heating remote controller 50 or the like. Since the flow of hot water during the skeleton heat storage operation is the same as that of the heating operation described above, the description thereof is omitted here.

FIG. 9 is a flowchart showing an example of the flow of processing of the skeleton heat storage operation by the hot water supply / heating device 1 according to the first embodiment. In the following, a case where heat is stored in an unused living room 100a among a plurality of living rooms 100a will be described as an example.

When the skeleton heat storage operation is started, hot water is supplied to the user side heat exchanger 60 provided in the room to be heat storage in step S51. At this time, when the heating operation is not performed for the other living room 100a or the like, the device control unit 93 exhausts heat so that the inflow port 32a of the exhaust heat switching valve 32 and the first outflow port 32b communicate with each other. The switching valve 32 is controlled. Further, the equipment control unit 93 drives the primary side heating pump 27 and the secondary side heating pump 31.

In step S52, the comparison calculation unit 92 compares the set heat storage temperature preset in the storage unit 95 with the room temperature of the living room 100a to be heat storage detected by the user-side temperature sensor 61. The set heat storage temperature may be, for example, about 25 ° C.

As a result of the comparison, when the indoor temperature is equal to or higher than the set heat storage temperature (step S52; Yes), the skeleton heat storage operation ends in step S53. On the other hand, when the indoor temperature is lower than the set heat storage temperature (step S52; No), the process returns to step S51, and the skeleton heat storage operation is continued until the indoor temperature becomes equal to or higher than the set heat storage temperature.

When the skeleton heat storage operation is completed and the heating operation is not executed for the other living room 100a or the like, the equipment control unit 93 stops the primary side heating pump 27 and the secondary side heating pump 31.

As described above, in the hot water supply / heating device 1 according to the first embodiment, the intermediate pressure heat exchanger 16 provided in the bypass circuit is used between the refrigerant flowing in the bypass circuit and the water flowing in the waste heat recovery circuit. Heat exchange takes place. Then, the water heated by the condenser 12 and the hot water stored in the hot water storage tank 21 are supplied to the external bathtub 102. As a result, when the water is heated by the heat pump, the waste heat recovery operation using the waste heat is performed, so that the heating capacity is increased without increasing the size of the heat pump as compared with the case where only air is used as the heat source. can do. Further, even when a small hot water storage tank 21 having a small heat storage amount is used, it is possible to cope with a bath hot water supply or the like that requires a large amount of heat, and it is possible to efficiently boil hot water.

Further, at this time, the pressure of the refrigerant heat-exchanged by the intermediate pressure heat exchanger 16 becomes the intermediate pressure. Therefore, for example, the evaporation temperature of the refrigerant can be increased as compared with the case where the refrigerant flowing out from the evaporator that exchanges heat between the refrigerant and the hot water has a low pressure, so that the COP of the heat pump can be increased. Further, in this case, the evaporation temperature of the refrigerant is higher than that in the case where the refrigerant flowing out of the evaporator is at a low pressure, and the temperature of the hot water flowing through the exhaust heat return pipe 5 does not drop too much. Condensation of the heat exchanger 60 and the like can be prevented.

Further, for example, in a highly airtight and highly insulated house, heat tends to be trapped on the second floor or attic of the house even in winter due to the influence of daytime sunlight, but in the first embodiment, the heat trapped in this way. Is used as waste heat, so it is possible to eliminate the heat cage.

In the hot water supply / heating device 1, when the temperature detected by the user-side temperature sensor 61 is equal to or higher than the set waste heat recovery recoverable temperature, the heat pump controller 8 opens the second expansion valve 15 so that the refrigerant flows through the bypass circuit. Control the degree. Further, the hot water storage unit controller 9 drives the secondary side heating pump 31 so that water flows through the waste heat recovery circuit. As a result, it is possible to perform an exhaust heat recovery operation using the heat stored in the room.

In the hot water supply / heating device 1, when the temperature detected by the user-side temperature sensor 61 is equal to or lower than the set waste heat recovery end temperature, the heat pump controller 8 uses the second expansion valve 15 to prevent the refrigerant from flowing into the bypass circuit. Controls the opening degree of. Further, the hot water storage unit controller 9 stops driving the secondary side heating pump 31 so that water does not flow into the waste heat recovery circuit. As a result, the waste heat recovery operation can be performed to the extent that the temperature of the air-conditioned space is not lowered too much.

When the outlet temperature of the water flowing out from the user-side heat exchanger 60 becomes equal to or lower than the set outlet temperature, the heat pump controller 8 adjusts the opening degree of the second expansion valve 15 so as to stop the waste heat recovery operation. You may control it. Further, the hot water storage unit controller 9 may control the drive of the secondary side heating pump 31 so as to stop the waste heat recovery operation.

Further, when the inlet temperature of the water flowing into the user-side heat exchanger 60 becomes equal to or lower than the set inlet temperature, the heat pump controller 8 adjusts the opening degree of the second expansion valve 15 so as to stop the waste heat recovery operation. You may control it. Further, the hot water storage unit controller 9 may control the drive of the secondary side heating pump 31 so as to stop the waste heat recovery operation.

In the hot water supply heating device 1, heat is exchanged between the heated water flowing out from the heating heat exchanger 26 and the indoor air by the user side heat exchanger 60 before the exhaust heat recovery operation is performed. , The room air is heated. As a result, heat can be stored in a room or the like that is absent during the day, and the stored heat can be used as waste heat when the hot water supply load such as bath hot water supply is large. Therefore, even when the bathtub 102 is not filled with hot water, the heat storage during the day can be used as the preheating for heating even when the prediction and the schedule are different, so that the heat storage can be effectively used.

In the hot water supply heating device 1, the compressor 11 has a low pressure side compression chamber 11a and a high pressure side compression chamber 11b, and a bypass circuit is connected to an intermediate pressure portion between the low pressure side compression chamber 11a and the high pressure side compression chamber 11b. To. Further, the compressor 11 may be provided with an injection port in the intermediate pressure portion of the compression chamber, and a bypass circuit may be connected to the injection port. As a result, the refrigerant evaporated in the intermediate pressure heat exchanger 16 is introduced into the intermediate pressure portion of the compressor 11, so that the flow rate of the refrigerant can be increased without increasing the volume of the low pressure side compression chamber 11a.

Although the first embodiment of the present invention has been described above, the present invention is not limited to the first embodiment of the present invention described above, and various modifications and applications are made without departing from the gist of the present invention. Is possible. In the first embodiment, it has been described that the heat pump unit 10 is provided with the heat pump controller 8 and the hot water storage unit 20 is provided with the hot water storage unit controller 9, but this is not limited to this example.

For example, instead of the heat pump controller 8 and the hot water storage unit controller 9, a controller having both functions may be provided. In this case, the controller may be provided in either the heat pump unit 10 or the hot water storage unit 20, or may be provided separately from these units.

1 Hot water supply and heating equipment, 2 Hot water outlet piping, 3 Water inlet piping, 4 Exhaust heat outbound piping, 5 Exhaust heat return piping, 6 Heating outbound piping, 7 Heating return piping, 8 Heat pump controller, 9 Hot water storage unit controller, 10 Heat pump unit, 11 Compression Machine, 11a Low pressure side compression chamber, 11b High pressure side compression chamber, 12 Condenser, 13 1st expansion valve, 14 Evaporator, 15 2nd expansion valve, 16 Intermediate pressure heat exchanger, 17 Blower, 20 Hot water storage unit, 20a Water supply Port, 20b general hot water supply port, 20c bath hot water supply port, 20d water supply pipe, 20e hot water supply pipe, 20f hot water supply pipe, 20g hot water introduction pipe, 20h hot water outlet pipe, 21 hot water storage tank, 21a tank water supply port, 21b lower outlet, 21c Lower inlet, 21d Upper inflow outlet, 21e Upper outlet, 22 Boiling pump, 23 General hot water supply mixing valve, 23a 1st inlet, 23b 2nd inlet, 23c outlet, 24 Bath hot water supply mixing valve, 24a 1st Inlet, 24b 2nd inlet, 24c outlet, 25 Hot water filling on-off valve, 26 Heating heat exchanger, 27 Primary side heating pump, 28 Heating forward header, 29 Heating return header, 30 Flow control valve, 31 Secondary Side heating pump, 32 exhaust heat switching valve, 32a inlet, 32b first outlet, 32c second outlet, 40 hot water supply remote controller, 41 inlet temperature sensor, 42 hot water temperature sensor, 43 outside air temperature sensor, 50 heating remote controller , 51 Hot water storage temperature sensor, 52 Heating going temperature sensor, 53 Heating return temperature sensor, 60 User side heat exchanger, 61 User side temperature sensor, 70 Exhaust heat recovery heat exchanger, 71 Exhaust heat recovery side temperature sensor, 81 Information acquisition Unit, 82 calculation unit, 83 equipment control unit, 84 communication unit, 85 storage unit, 91 information acquisition unit, 92 comparison calculation unit, 93 equipment control unit, 94 communication unit, 95 storage unit, 100 housing, 100a living room, 100b undressing Place, 100c bathtub, 100d non-living space, 101 hot water supply end, 102 bathroom, 103 heating equipment, 104 exhaust heat recovery indoor unit, 110a general hot water supply piping, 110b bath hot water supply piping.

Claims (12)

A refrigerant circuit through which a refrigerant flows is formed by sequentially connecting a compressor, a condenser, a first expansion valve, and an evaporator, and a heat pump unit that heats water flowing into the condenser by the heat of the refrigerant.
A hot water storage unit with a hot water storage tank for storing hot water,
It is equipped with a user-side heat exchanger that is connected to the hot water storage unit and heats or cools the indoor air.
The heat pump unit is
A bypass circuit that branches from between the condenser and the first expansion valve and is connected to the intermediate pressure portion of the compressor.
An intermediate pressure heat exchanger provided in the bypass circuit that exchanges heat between the refrigerant flowing in the refrigerant side flow path and water flowing in the hot water side flow path to evaporate the refrigerant.
It has a second expansion valve provided in the bypass circuit and depressurizes the refrigerant flowing through the bypass circuit.
A waste heat recovery circuit is formed by connecting the hot water side flow path of the intermediate pressure heat exchanger and the utilization side heat exchanger.
A hot water supply / heating device in which the water heated by the condenser and the hot water stored in the hot water storage tank are supplied to the outside. The hot water storage unit is
It further has a pump that sends out water flowing through the waste heat recovery circuit.
The hot water supply / heating device is
Further provided with at least a controller for controlling the opening degree of the second expansion valve and the drive of the pump.
The exhaust heat recovery operation for heat exchange between the refrigerant flowing through the bypass circuit and the water flowing through the waste heat recovery circuit is performed by controlling the opening degree of the second expansion valve and the drive control of the pump by the controller. The hot water supply / heating device according to claim 1. Further equipped with a user-side temperature sensor for detecting the temperature in the room provided with the user-side heat exchanger.
When the temperature detected by the user-side temperature sensor is equal to or higher than the set waste heat recovery recoverable temperature,
The controller opens the second expansion valve and drives the pump.
The hot water supply / heating device according to claim 2, wherein the waste heat recovery operation is performed. When the temperature detected by the user-side temperature sensor is equal to or lower than the set exhaust heat recovery end temperature,
The controller closes the second expansion valve and stops driving the pump.
The hot water supply / heating device according to claim 3, wherein the waste heat recovery operation is stopped. Further equipped with a heating return temperature sensor that detects the outlet temperature of the water flowing out from the user side heat exchanger.
When the temperature detected by the heating return temperature sensor is equal to or lower than the set outlet temperature,
The controller closes the second expansion valve and stops driving the pump.
The hot water supply / heating device according to claim 2 or 3, wherein the waste heat recovery operation is stopped. It is further equipped with a heating going temperature sensor that detects the inlet temperature of the water flowing into the user side heat exchanger.
When the temperature detected by the heating going temperature sensor is equal to or lower than the set inlet temperature,
The controller closes the second expansion valve and stops driving the pump.
The hot water supply / heating device according to claim 2 or 3, wherein the waste heat recovery operation is stopped. The hot water storage unit is
Further, a heating heat exchanger that heats the water by exchanging heat between the hot water that is connected to the user-side heat exchanger and flows out of the hot water storage tank and the water that flows through the user-side heat exchanger. Have and
Before the exhaust heat recovery operation is performed, the heat exchange between the heated water flowing out of the heating heat exchanger and the indoor air by the utilization side heat exchanger is performed, so that the indoor heat is exchanged. The hot water supply / heating device according to any one of claims 2 to 6, wherein the air is heated. The user side heat exchanger is
The hot water supply / heating device according to any one of claims 1 to 7, which is provided in the air-conditioned space. The user side heat exchanger is
The hot water supply / heating device according to any one of claims 1 to 7, which is an exhaust heat recovery heat exchanger provided in the waste heat recovery target space. A claim in which, when the user-side heat exchanger is provided in each of the plurality of spaces, the user-side heat exchanger that performs the waste heat recovery operation is set by the user from the plurality of user-side heat exchangers. The hot water supply / heating device according to any one of 2 to 7. The compressor
It has a low-pressure side compression chamber and a high-pressure side compression chamber for compressing the refrigerant.
The hot water supply / heating device according to any one of claims 1 to 10, wherein the bypass circuit is connected to the intermediate pressure portion between the low pressure side compression chamber and the high pressure side compression chamber. The compressor
An injection port is provided in the intermediate pressure portion of the compression chamber for compressing the refrigerant.
The hot water supply / heating device according to any one of claims 1 to 10, wherein the bypass circuit is connected to the injection port.

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