KR101596154B1 - Heat pump system - Google Patents

Abstract

(PURPOSE) Provided is a technology which enables energy saving in a heat pump system performing both water boiling and heating operations by using a single heat pump as a heat source. (CONSTITUTION) The heat pump system disclosed by the specification comprises: a compressor which pressurizes a refrigerant; a condenser which condenses the refrigerant by exchanging heat between a thermal medium for heating and/or boiled water; an expander which depressurizes the refrigerant; a heat pump which includes a vaporizer for vaporizing the refrigerant; a heater which circulates the thermal medium for heating through each of the condenser and a heating terminal; and a boiler which stores the boiled water from a water supply in a water storage tank, circulates the boiled water between the condenser and the water storage tank, and supplies the boiled water from the water storage tank to a space for boiling the water. The heat pump system circulates the thermal medium for heating through the condenser and circulates the boiled water through the condenser, while the heat pump is stopped. Therefore, it is possible to perform a first heat recovery operation which performs heat recovery from the thermal medium for heating to the boiled water.

Description

[0001] HEAT PUMP SYSTEM [0002]

The present invention relates to a heat pump system.

Patent Document 1 discloses a heat pump system. The heat pump system includes a heat pump including a compressor for pressurizing the refrigerant, a condenser for condensing the refrigerant by heat exchange between the heat for heating and / or hot water, an expander for decompressing the refrigerant, and an evaporator for evaporating the refrigerant, A heater for circulating the heating water to each of the condenser and the heating terminal; a water heater for circulating the hot water for hot water from the water source in the hot water tank, circulating the water for hot water between the condenser and the hot water tank, and the hot water for hot water And a hot water heater. According to the above heat pump system, it is also possible to heat the hot water used for hot water supply using a heat pump having a high energy efficiency as a heat source, and to heat the heating purpose heat used for heating.

Patent Document 1: JP-A-2009-299942

In the above-described heat pump system, after the heating operation is performed, the heat for heating has residual heat (residual heat). If the leftover heat of the heating-purpose fruit is left as it is, it is lost by natural heat radiation. If the remaining heat of the heat for heating can be recovered, the heat pump system which is further energy saving can be realized.

The present specification provides techniques for solving the above problems. The present specification provides a technique capable of realizing energy saving in a heat pump system that uses both a single heat pump as a heat source and both hot water supply and heating.

The present disclosure discloses a heat pump system. The heat pump system includes a heat pump including a compressor for pressurizing the refrigerant, a condenser for condensing the refrigerant by heat exchange between the heat for heating and / or hot water, an expander for decompressing the refrigerant, and an evaporator for evaporating the refrigerant, A heater for circulating the heating water to each of the condenser and the heating terminal; a water heater for circulating the hot water for hot water from the water source in the hot water tank; circulating hot water for hot water between the condenser and the hot water tank; And a hot water heater. The heat pump system is configured to execute the first heat recovery operation in which the heat for heating is circulated to the condenser while the heat pump is stopped and the water for hot water is circulated to the condenser so that heat recovery from the heat for heating to the hot water is performed in the condenser It is possible.

In the above-described heat pump system, the first heat recovery operation is performed, whereby the remaining heat of the heating-use heat can be collected in the hot water supply water and stored in the low temperature bath. In general, various kinds of structures for preventing natural heat radiation are adopted in the low-temperature bath, and the natural heat radiation from the water for hot water in the low-temperature bath is smaller than the natural heat radiation from the heating heat in the heater. According to the above heat pump system, energy saving can be realized. In addition, in the heat pump system described above, the heat recovery from the heating-purpose fruit to the hot water supply water is performed by using the condenser of the heat pump that is stopped, and there is no need to separately provide a heat exchanger for heat recovery from the heating- It is possible to realize a heat pump system which saves energy with a small number of parts.

In the heat pump system, it is possible to operate a heat pump to circulate the water for hot water supply to the condenser, and to store the hot water for heating in the condenser in the hot water tank. When the heat storage operation is started, The first heat recovery operation can be performed before the heat storage operation when the temperature of the heating heat is higher than the temperature of the hot water supply water.

According to the above heat pump system, residual heat can be recovered from the hot water for heating by the timing at which heat is required to be stored in the low temperature bath, and stored in the low temperature bath. It is possible to reduce the amount of heating in the heat pump required for the heat storage in the low temperature bath, thereby realizing energy saving.

The heat pump system includes a reheat heat exchanger in which a heater radiates heat between the bath water and the heating heat, circulates the bath water to the reheat heat exchanger, circulates the heating heat to the reheat heat exchanger, So that it is possible to carry out the second heat recovery operation in which heat recovery from the bathtub water to the heating heat is performed.

When the heater is provided with the reheat heat exchanger, it becomes possible to reheat the water in the bath with the heat pump as the heat source. In the above-described heat pump system, the second heat recovery operation is performed to recover the remaining heat of the bathtub water to the heating heat, and the remaining heat of the heating heat can be recovered to the hot water for storage in the low temperature bath. According to the above-described heat pump system, it is possible to realize energy saving of a further layer.

In the heat pump system, it is possible to carry out a heating operation for circulating heating energy to the condenser by operating the heat pump, and circulating the heating energy heated in the condenser to the heating terminal. When starting the heating operation, When the temperature of the bathtub is higher than the temperature, the second heat recovery operation can be performed before the heating operation.

According to the above-described heat pump system, the remaining heat can be recovered from the bathtub water by the heat for heating at the timing when heating for heating is required. The amount of heating in the heat pump required for the heating operation can be reduced and energy saving can be realized.

Another heat pump system disclosed in this specification includes a compressor for pressurizing a refrigerant, a condenser for condensing the refrigerant by heat exchange between the heat for heating, an expander for decompressing the refrigerant, and an evaporator for evaporating the refrigerant, And a heater for circulating heating energy to each of a condenser, a heating terminal, and a reheat heat exchanger for exchanging heat between the bath water stored in the bathtub. The heat pump system includes a second heat recovery operation for circulating the bath water to the reheat heat exchanger and circulating the heat for heating to the reheat heat exchanger to perform heat recovery from the bath water number to the heating heat in the reheat heat exchanger, It is possible to carry out the heating operation in which the heating-purpose fruit is circulated to the condenser and the heating-purpose heating material heated in the condenser is circulated to the heating terminal. The heat pump system performs the second heat recovery operation before the heating operation when the temperature of the bathtub is higher than the temperature of the heating heat at the start of the heating operation.

With the above-described heat pump system, the remaining heat can be recovered from the bathtub water by the heat for heating at the timing when heating for heating is required. The amount of heating in the heat pump required for the heating operation can be reduced and energy saving can be realized.

The above heat pump system further includes an inactivity detection means for detecting an outflow from the bathtub of the user from the bathtub (hereinafter also referred to as " bathing "), The second heat recovery operation can be performed when the temperature of the bath water is higher than the temperature of the heating heat.

According to the above heat pump system, the remaining heat of the bathtub remaining in the bath immediately after bathing by the user can be recovered to the heating-use fruit and used effectively. Energy saving can be realized.

The heat pump system further includes input means for allowing the user to input an instruction to lower the temperature of the bath water stored in the bathtub. When an instruction to lower the temperature of the bathtub water stored in the bathtub is inputted, The second heat recovery operation can be performed when the temperature of the bathtub is higher than the temperature of the bathtub.

According to the above heat pump system, when the temperature of the bath water stored in the bath is lowered, the heat absorbed from the bath water can be effectively recovered to the heating oil. Energy saving can be realized. Further, the amount of tap water used can be saved as compared with the case where the temperature of the bath water is lowered by the addition of the running water to the bathtub.

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

Fig. 1 is a diagram schematically showing a configuration of a heat pump system 2 according to the embodiment.
2 is a flowchart of the start determination of the water heating heat recovery operation accompanying the start of the heat accumulation operation.
3 is a flowchart of the start determination of the bath water heat recovery operation accompanying the start of the heating operation.
4 is a flow chart of the determination of the start of bath water heat recovery operation and heating water heat recovery operation to be performed after bathing by the user.
Fig. 5 is a flowchart of the determination of the start of the bath water heat recovery operation and the heating water heat recovery operation to be performed when the hot water switch is turned on.

(Example)

Fig. 1 shows a heat pump system 2 of the present embodiment. The heat pump system 2 includes a tank unit 4, a heat pump unit 6, a heat source unit 8, and a control device 100.

The heat pump unit 6 includes a heat pump 50, a hot water circulating pump 22, and an outside temperature thermistor 55. Heat pump 50 includes a refrigerant and a refrigerant circulation passage 52 for circulating (for HFC refrigerant or, C0 ₂ refrigerant that R744 example that R410A), the air heat exchanger (evaporator 54), a fan (56) , A compressor (62), a three-fluid heat exchanger (58), and an expansion valve (60). The outside temperature thermistor 55 detects the outside air temperature.

The air heat exchanger (54) exchanges heat between the outside air blown by the fan (56) and the refrigerant in the refrigerant circulation path (52). The refrigerant in a low-pressure low-temperature liquid state after passing through the expansion valve (60) is supplied to the air heat exchanger (54). The air heat exchanger (54) heats the refrigerant by exchanging heat between the refrigerant and the outside air. The refrigerant vaporizes by being heated, and becomes a gas state of relatively high temperature and low pressure.

The refrigerant after passing through the air heat exchanger (54) is supplied to the compressor (62). That is, the compressor 62 is supplied with a relatively high-temperature and low-pressure gaseous refrigerant. The refrigerant is compressed by the compressor (62), so that the refrigerant becomes a gas state of high temperature and high pressure. The compressor (62) delivers the compressed high-temperature, high-pressure gaseous refrigerant to the three-fluid heat exchanger (58).

The three-fluid heat exchanger (58) is supplied with high-temperature, high-pressure gaseous refrigerant discharged from the compressor (62). 3 fluid heat exchanger 58 can perform heat exchange between the refrigerant in the refrigerant circulation path 52 and the water in the tank water circulation path 20 described later (hereinafter also referred to as "hot water supply water"). The three-fluid heat exchanger 58 can perform heat exchange between the refrigerant in the refrigerant circulation path 52 and water (hereinafter also referred to as "heating water") in the second heating heating path 84 described later. As a result of the heat exchange in the three-fluid heat exchanger (58), the refrigerant is deprived of heat and condensed. As a result, the refrigerant is in a liquid state of relatively low temperature and high pressure. In the three-fluid heat exchanger (58), heat exchange is also performed between the hot water supply water in the tank water circuit (20) and the heating water in the second heating heating path (84).

A relatively low-temperature, high-pressure liquid refrigerant that has passed through the three-fluid heat exchanger (58) is supplied to the expansion valve (60). The refrigerant is decompressed by passing through the expansion valve (60) and becomes a low-temperature low-pressure liquid state. The refrigerant having passed through the expansion valve 60 is sent to the air heat exchanger 54 as described above.

When the fan 56 and the compressor 62 are operated in the heat pump 50, the refrigerant in the refrigerant circuit 52 flows through the air heat exchanger 54, the compressor 62, the three-fluid heat exchanger 58, Valve 60 in this order. In this case, in the three-fluid heat exchanger (58), the water for hot water in the tank water circuit (20) or the heating water in the second heating furnace (84) is heated.

The tank unit 4 is provided with a tank 10. The tank 10 stores the heated hot water by the heat pump 50. The water for hot water supply in this embodiment is tap water. The tank 10 is of a closed type and is covered on the outside by a heat insulating material. In the tank 10, water for hot water supply is stored up to full water. The tank 10 is provided with a plurality of tank thermisters 10a, 10b and 10c at a predetermined level from the top. The tank thermisters 10a, 10b, and 10c detect the temperature of hot water in the tank 10 at each water level. A tank top thermistor 10d for detecting the temperature of water for hot water supply at the top of the tank 10 is provided at the top of the tank 10.

The tank water circuit 20 includes a tank water passageway 20a for connecting the lower portion of the tank 10 and the three fluid heat exchanger 58 and a tank water passageway 20b for connecting the three fluid heat exchanger 58 and the switch valve 21 A high temperature water return passage 23a for connecting between the switching valve 21 and the upper portion of the tank 10 and a high temperature water return passage 23b for connecting between the switching valve 21 and the middle portion of the tank 10 And a low-temperature water return passage 23b. The hot water supply circulation pump 22 of the heat pump unit 6 and the hot water supply water supply thermistor 26a for detecting the temperature of hot water supply water passing through the inside of the hot water supply circulation pump 22 are fitted Intervention "). A hot water supply water return thermistor 26b for detecting the temperature of hot water supply water passing through the inside of the tank water passage 20b is opened. The switching valve 21 is switched to the state in which the low temperature water passage 23b is blocked and the tank water passage 20b and the high temperature water passage 23a are communicated with each other and the high temperature water passage 23a is blocked, And the low-temperature water passage 23b are communicated with each other. When the heat pump 50 is operated to drive the hot water circulation pump 22 in the heat pump unit 6, the hot water for the hot water under the tank 10 flows through the tank water passageway 20a, (58) and heated. The hot water for hot water is sent to the hot water return passage 23a or the low temperature water return passage 23b via the tank water return passage 20b and returned to the upper or middle portion of the tank 10. Inside the tank 10, a thermally stable layer in which a hot water supply water layer is layered is formed on a low temperature hot water supply layer.

The tap water introducing passage 24 has an upstream end connected to a tap water supply source 32 outside the heat pump system 2. In the tap water introducing passage 24, a water supply thermistor 28 for detecting the water supply temperature of tap water is opened. The downstream side of the tap water introduction path 24 branches into the first introduction path 24a and the second introduction path 24b. The downstream end of the first introduction passage 24a is connected to the lower portion of the tank 10. The downstream end of the second introduction path 24b is connected in the middle of the first hot water supply path 36. [

The first hot water supply path (36) has an upstream end connected to the upper portion of the tank (10). As described above, the second introduction path 24b of the tap water introduction path 24 is connected to the first hot water path 36 at the middle. A mixing valve 30 is opened at a connection portion between the first hot water supply path 36 and the second introduction path 24b. The mixing valve 30 is provided between the flow rate of hot water for hot water flowing into the first hot water path 36 from the upper portion of the tank 10 and the flow rate of hot water flowing from the second introduction path 24b to the first hot water path 36 Adjust the ratio of the flow rate of tap water. A mixed thermistor 36a is opened in the first hot water path 36 on the downstream side of the mixing valve 30 to detect the temperature of the hot water for mixing after mixing in the mixing valve 30. [ The first hot water channel 36 on the downstream side of the mixing valve 30 is connected to the second hot water channel 39 through the hot water heating furnace 37 of the heat source unit 8. The first hot water supply path (36) and the second hot water supply path (39) are connected by a heat source bypass path (33). A bypass valve 34 is opened in the heat source bypass path 33. [ The downstream end of the second hot water channel 39 is connected to the hot water supply 38. The second hot water supply path 39 is provided with a hot water supply thermistor 39a for detecting the temperature of hot water supplied to the hot water supply 38.

The heat source unit 8 includes a cystone 70, a heating burner 82, and a hot water burner 81. The cistern 70 is a container having an open upper portion, and reserves heating water for the inside thereof. The water for heating in this embodiment is, for example, water or an antifreeze. The upstream end of the heating forward path 72 is connected to the cen- tern 70. [ A heating water circulation pump 74 and a low temperature heating thermistor 72a for detecting the temperature of the heating water passing through the interior of the heating path 72 are opened. When the water heating water circulation pump 74 is driven, the heating water in the cistern 70 flows into the heating heat path 72.

The downstream end of the heating forward path 72 branches to the first heating heating path 73 and the low temperature heating circulation path 75. The low temperature heating circulation path (75) is equipped with a low temperature heater (78). The low-temperature heater (78) is a heating device that uses the relatively low-temperature heating water as a heat source, and is, for example, a floor heater. As the low temperature heater 78, a desired number of low temperature heaters can be mounted. The low-temperature heating circulation path (75) is provided with a heating bypass path (78a) for bypassing the low-temperature heater (78) to flow the heating water. A bypass valve 78b is opened in the heating bypass path 78a. The downstream end of the low temperature heating circulation path (75) is connected to the upstream end of the second heating heating path (84). The downstream end of the second heating heating path 84 is connected to the upstream end of the heating return path 96 through the three-fluid heat exchanger 58 of the heat pump unit 6. The downstream end of the heating return passage 96 is connected to the cistern 70 of the heat source unit 8.

A heating burner 82 is opened in the first heating heating furnace 73. The heating burner 82 heats the heating water in the first heating heating furnace 73. The first heating heating furnace 73 on the downstream side of the heating burner 82 is equipped with a high-temperature heating thermistor 73a for detecting the temperature of the heating water passing through the inside thereof. The downstream end of the first heating heating furnace 73 is branched to the high-temperature heating circulation path 77 and the reheating circulation path 79. The high-temperature heating circuit 76 is mounted on the high-temperature heating circulation path 77. The high-temperature heater 76 is a heating device that uses a relatively high-temperature heating water as a heat source, and is, for example, a bathroom heating dryer. As the high-temperature heater 76, a desired number of high-temperature heaters can be mounted. The downstream end of the high-temperature heating circulation path 77 is connected to the upstream end of the heating return path 96.

The HP bypass path 86 connects between the second heating heating path 84 and the heating return path 96. A mixing valve 88 is opened at a connection portion between the second heating heating furnace 84 and the HP bypass path 86. The mixing valve 88 is connected to the flow rate of the heating water flowing into the heating return path 96 from the second heating heating path 84 via the three fluid heat exchanger 58 and the flow rate of the heating water flowing from the second heating heating path 84 to the HP bypass The ratio of the flow rate of the heating water flowing into the heating return passage 96 via the passage 86 is adjusted.

A reheating heat valve 83 and a reheating heat exchanger 97 are opened in the reheating circulation path 79. The reheating thermo valve 83 opens and closes the reheating circulation path 79. In the reheating heat exchanger (97), heat exchange is performed between the water for heating flowing through the reheating circulation path (79) and the number of bathtubs flowing through the tub water circulation path (91). The downstream end of the reheating circulation path 79 is connected to the heating return path 96.

The upstream end of the bath water circulation path 91 is connected to the bottom of the bathtub 98. The downstream end of the bath water circulation path 91 is connected to the side of the bathtub 98. In the bath water circulation path 91, a bath water circulation pump 99 is opened. When the bath water circulation pump 99 is driven, the number of bathtubs sucked from the bottom of the bathtub 98 passes through the reheating heat exchanger 97 and is returned to the side of the bathtub 98. The bath water circulation path 91 on the upstream side of the reheating heat exchanger 97 is open to the bath water return thermistor 91a for detecting the temperature of the bathtub water passing through the inside thereof. The bath water circulation path 91 on the downstream side of the reheating heat exchanger 97 is provided with a bath water supply thermistor 91b for detecting the temperature of the bath water passing through the inside thereof. A water level sensor 91c for detecting the water level of the bathtub 98 is opened in the bath water circulation path 91. [

In the hot water heating furnace 37, a hot water burner 81 is opened. A hot water tasting heater 37 on the downstream side of the hot water burner 81 is equipped with a hot water tester 37a for detecting the temperature of hot water passing through the inside thereof. The bathtub pouring channel 40 is branched on the downstream side of the hot water burner 81 of the hot water heating furnace 37. A pouring solenoid valve (42) for opening and closing the bath pouring path (40) is opened in the tub pouring path (40). The downstream end of the bath pouring path 40 is connected to the bath water circulation pump 99.

The control device 100 controls the operation of each component of the tank unit 4, the heat pump unit 6, and the heat source unit 8.

The heat pump system 2 can perform various operations as described below.

(Heat storage operation)

In the heat storage operation, the hot water in the tank 10 is heated by the heat pump 50, and the hot water for hot water is returned to the tank 10. When the heat storage operation is performed, the control device 100 drives the compressor 62 and the fan 56 to operate the heat pump 50. [ The switching valve 21 is switched to a state in which the tank water passage 20b and the high-temperature water passage 23a communicate with each other, and the hot water supply water circulation pump 22 is driven.

The refrigerant in the refrigerant circulation path 52 is circulated in the order of the air heat exchanger 54, the compressor 62, the three-fluid heat exchanger 58 and the expansion valve 60 by driving of the compressor 62. [ In this case, the refrigerant in the refrigerant circulation path (52) passing through the three-fluid heat exchanger (58) is in a gas state of high temperature and high pressure. In addition, the hot water supply circulation pump 22 circulates hot water in the tank 10 through the tank water circulation passage 20. That is to say, when the hot water supply water present in the lower portion of the tank 10 is introduced into the tank water circuit 20 and the introduced hot water flows through the three-fluid heat exchanger 58, the heat of the refrigerant in the refrigerant circulation path 52 And the heated hot water is returned to the upper portion of the tank 10. As a result, hot water for hot water is stored in the tank (10). When the inside of the tank 10 becomes a full state filled with hot water for hot water, the heat accumulation operation is ended.

(Hot water operation)

The hot water supply operation is an operation of supplying the hot water in the tank 10 to the hot water supply 38. The hot water supply operation may be executed in parallel with the above-described heat accumulation operation. Tap water flows into the lower portion of the tank 10 from the tap water introduction path 24 through the first introduction path 24a by the water pressure from the tap water supply source 32. At the same time, The hot water for the upper portion of the hot water supply tank 10 is supplied to the hot water supply 38 through the first hot water supply path 36.

When the temperature of the hot water supplied from the tank 10 to the first hot water supply path 36 is higher than the hot water setting temperature, the control device 100 drives the mixing valve 30 to discharge the hot water from the second introduction path 24b The tap water is introduced into the first hot water furnace 36. Therefore, the water for hot water supplied from the tank 10 and the tap water supplied from the second introduction path 24b are mixed in the first hot water supply path 36. The control device 100 adjusts the opening degree of the mixing valve 30 so that the temperature of the hot water supplied to the hot water supply 38 becomes equal to the hot water setting temperature. On the other hand, when the temperature of the hot water supply water supplied from the tank 10 to the first hot water supply path 36 is lower than the hot water setting temperature, the controller 100 controls the first hot water path 36 ) In the water. The control device 100 controls the output of the hot water burner 81 such that the temperature of hot water supplied to the hot water supply 38 is equal to the hot water setting temperature.

(Heating operation)

The heating operation is an operation in which the heating water is heated by the heat pump 50 and heated by the low temperature heater 78 or the high temperature heater 76 using the high temperature heating water. When execution of the heating operation is instructed by the user, the control device 100 activates the water circulation pump 74 for heating. In addition, the control device 100 drives the compressor 62 and the fan 56. Thereby, the heating water heated in the three-fluid heat exchanger 58 is supplied to the low-temperature heater 78 and the high-temperature heater 76 via the cistern 70. Further, the control device 100 operates the heating burner 82 as necessary. As a result, the heating water in the high-temperature heater 76 is supplied to the heating burner 82 at a higher temperature. In the heating operation, the temperature of the heating water supplied to the low temperature heater 78 is set to the low temperature setting temperature, and the temperature of the heating water supplied to the high temperature heater 76 is set to the high temperature setting temperature. The operation and the output of the heating burner 82 are adjusted.

When the number of the low temperature radiators 78 and the high temperature radiators 76 that operate is increased, the load of the heating water circulating pump 74 is increased correspondingly. Therefore, in this embodiment, the opening degree of the mixing valve 88 is adjusted corresponding to the number of the low temperature heater 78 and the high temperature heater 76 that are operating, and the opening degree of the low temperature heater 78 and the high temperature heater 76 The greater the logarithm, the greater the percentage of heating water flowing through HP bypass 86. When the ratio of the heating water flowing in the HP bypass furnace 86 is increased, the ratio of the heating water flowing through the three-fluid heat exchanger 58 with a high pressure drop is reduced, and the load of the water heating circulation pump 74 is reduced. With such a configuration, it is possible to suppress the increase in the load of the water circulation pump 74 for heating even when the number of the low temperature heater 78 and the high temperature heater 76 that operate becomes large.

(Water supply operation)

The running water supply operation is an operation of supplying hot water to the bathtub 98. When the user instructs the start of the water supply operation, the heat pump system 2 starts the water supply operation. In the water supply operation, the pouring solenoid valve 42 is opened. When the pouring solenoid valve 42 is opened, tap water flows into the lower portion of the tank 10 from the tap water introduction path 24 and the first introduction path 24a by the water pressure from the tap water supply source 32. At the same time, the hot water for the upper portion of the tank 10 is supplied to the bathtub 98 through the first hot water path 36, the bathtub pouring path 40, and the bath water circulation path 91. In the hot water supply operation, the temperature of the water supplied to the tub pouring path 40 is adjusted to the hot water supply set temperature in the same manner as the hot water supply operation. When the quantity of the water supplied to the bathtub 98 reaches the set quantity of supplying the hot water, the hot water supply operation is terminated.

(Reheating operation)

The reheating operation is an operation of reheating the number of bathtubs stored in the bathtub 98. When the user instructs the start of the reheating operation, the heat pump system 2 starts the reheating operation. In the reheating operation, the bath water circulation pump 99 is driven. Further, the reheating heat valve 83 is opened to drive the water heating water circulation pump 74. Thus, the bathtub water is drawn from the bottom of the bathtub 98 and heated by heat exchange with the water for heating in the reheating heat exchanger 97. The heated bath water is returned to the side of the bathtub 98. In the reheating operation, the heating water is heated by the heating burner 82.

(Heating water heat recovery operation)

After the heating operation and the reheating operation are performed, the cen- tern 70, the heating path 72, the first heating heating path 73, the low-temperature heating circulation path 75, the high-temperature heating circulation path 77, the reheating circulation path 79, The heating water having residual heat is retained in the heating circuit of the second heating heating path 84, the heating return path 96, and the like. If the remaining heat of the heating water is left as it is, it is lost due to natural heat radiation. In the heat pump system 2 of the present embodiment, by carrying out the heating water heat recovery operation for heating, the remaining heat of the heating water can be collected in the hot water supply water and stored in the tank 10.

In the heating water heat recovery operation, the controller 100 controls the bypass valve (not shown) so that the heat pump 50 is stopped (i.e., the compressor 62 and the fan 56 are stopped) The mixing valve 88 is adjusted so that the heating water circulation pump 74 is driven so that the total flow rate of the heating water of the second heating heating path 84 flows to the three fluid heat exchanger 58. [ Thereby, the heating water of the cen- tres 70 passes through the three-fluid heat exchanger 58 and circulates back to the cen- tres 70. [ Further, the control device 100 drives the hot water supply water circulation pump 22. Thus, the water for hot water in the lower portion of the tank 10 is circulated through the three-fluid heat exchanger 58 and returned to the upper or middle portion of the tank 10. The hot water supply water is heated by the heat exchange between the hot water supply water and the heating water in the three-fluid heat exchanger (58), and the heating water is cooled. When the detected temperature of the hot water supply water return thermistor 26b is higher than the detection temperature of the tank thermistor 10c, the switching valve 21 is switched to a state in which the tank water return passage 20b and the hot water return passage 23a communicate with each other 3 fluid heat exchanger (58) to the upper portion of the tank (10). When the detected temperature of the hot water supply water returning thermistor 26b is lower than the detection temperature of the tank thermistor 10c, the switching valve 21 is switched to a state in which the tank water return passage 20b and the low temperature water return passage 23b communicate with each other 3 fluid heat exchanger (58) into the middle portion of the tank (10). With this configuration, the remaining heat of the heating water can be recovered in the hot water supply water while keeping the temperature layer of the tank 10, and the heat can be stored in the tank 10.

(Bath water heat recovery operation)

After bathing by the user, the number of bathtubs having residual heat remains in the bathtub 98. If the remaining heat of the bath water is left as it is, it is lost by natural heat radiation. In the heat pump system 2 of the present embodiment, by carrying out the bath water heat recovery operation, the remaining heat of the bathtub water can be recovered to the heating water.

In the bath water heat recovery operation, the control device 100 drives the bath water circulation pump 99. Thereby, the bath number of the bathtub 98 is circulated so as to pass through the reheating heat exchanger 97 and return to the bathtub 98. Further, the control device 100 opens the reheating heat valve 83 and drives the water circulation pump 74 for heating. Thus, the heating water in the cessation 70 passes through the reheating heat exchanger 97 and circulates back to the cesset 70. The heating water is heated by the heat exchange between the heating water and the bathtub water in the reheating heat exchanger 97, and the bathtub water is cooled. With this configuration, the remaining heat of the bathtub water can be recovered to the heating water. The remaining heat recovered from the bath water to the heating water can be used for the subsequent heating operation. It is also possible to carry out the aforementioned heating water heat recovery operation to recover the remaining heat recovered from the bath water to the heating water to the hot water supply water and store it in the tank 10.

(Determination of start of heat recovery operation)

The heat pump system 2 is provided with an operation mode in which the heat recovery operation and the bathtub water recovery operation can be performed automatically when the heating water heat recovery operation and the bath water heat recovery operation can be executed, And an operation mode in which the heat recovery operation is not always performed. The operation mode in which the heat pump system 2 is operated can be selected by a user through a remote controller or the like connected to the controller 100 in advance. Hereinafter, when the control device 100 executes the start determination of the heat recovery operation when the operation mode for automatically performing the heat recovery operation or the operation mode for inquiring the user about the necessity of the heat recovery operation is selected .

Fig. 2 shows a flow of start determination of the water heat recovery operation for heating accompanying the start of the heat accumulation operation.

In step S202, the controller 100 waits until there is an instruction for heat storage operation. If there is an instruction for heat storage operation (YES in step S202), the process proceeds to step S204.

In step S204, it is determined whether or not the controller 100 can perform the water heat recovery operation for heating. The determination of whether or not the heating water heat recovery operation is to be performed is carried out by driving the water circulation pump 74 for heating to acquire the detection temperature of the high temperature heating thermistor 73a and obtaining the detection temperature of the tank thermister 10c, do. The controller 100 determines that the water heat recovery operation for heating is possible when the detection temperature of the high temperature heating thermistor 73a is higher than the detection temperature of the tank thermistor 10c by a predetermined temperature or more. When it is judged that the heating water heat recovery operation is possible (YES in step S204), the process proceeds to step S206. When it is determined that the heating water heat recovery operation is not possible (NO in step S204), the process proceeds to step S214, and the heat storage operation is executed without executing the heating water heat recovery operation.

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

In step S208, the controller 100 inquires of the user whether or not to execute the water heat recovery operation for heating. In general, when the water heat recovery operation for heating is performed prior to the heat accumulation operation, the time until the heat storage in the tank 10 is completed is delayed as compared with the case where the heat accumulation operation is performed without performing the water heat recovery operation for heating. Therefore, in the heat pump system 2 of the present embodiment, the estimated time at which heat storage in the tank 10 is completed is estimated for both the case of performing the water heat recovery operation for heating and the case of not performing the water heat recovery operation for heating And notifies the user through the remote control. The user is urged to input a command for executing the water heating heat recovery operation for heating or an instruction for stopping the water heating heat recovery operation for heating through the remote controller. The estimated time at which heat storage in the tank 10 is completed is estimated from the current time, the required time for the heating water heat recovery operation, and the time required for heat storage operation. The time required for the heating water heat recovery operation is calculated based on the capacity of the heating water in the heating circuit, the detection temperature of the high temperature heating thermistor 73a, the detection temperature of the water supply thermistor 28, and the like. The time required for the heat storage operation is calculated based on the capacity of hot water supply water in the tank 10, the detection temperature of the outside temperature thermistor 55, the detection temperature of the water supply thermistor 28, and the like.

In step S210, the control device 100 determines whether or not an instruction to stop the heating water heat recovery operation is input within a predetermined time. In the heat pump system 2 of the present embodiment, in addition to the case where an instruction to perform a water heat recovery operation for heating is inputted from a user, a case in which any instruction from the user is not input within a predetermined time is also input to the heating water heat recovery operation . If there is an instruction to stop the heating water heat recovery operation within a predetermined time (YES in step S210), the process advances to step S214 to execute the heat accumulation operation without executing the heating water heat recovery operation. If there is no instruction to stop the heating water heat recovery operation within the predetermined time (NO in step S210), the process proceeds to step S212.

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

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

In the example shown in Fig. 2, the configuration for executing the start determination of the water heat recovery operation for heating at the start of the heat accumulation operation has been described. For example, at the end of the heating operation or the reheating operation, The determination may be performed. With this configuration, the heat of the heating water immediately after the heating operation and the reheating operation can be stored in the tank 10 without releasing natural heat.

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

In step S302, the controller 100 waits until there is an instruction for heating operation. If there is an instruction for the heating operation (YES in step S302), the process proceeds to step S304.

In step S304, it is determined whether or not the control device 100 can perform the bath water heat recovery operation. The determination of whether or not the bath water heat recovery operation is to be performed is made by driving the water circulation pump 74 for heating to acquire the detection temperature of the high temperature heating thermistor 73a and driving the bath water circulation pump 99 to regenerate the bath water recovery thermistor 91a, And comparing the detected temperatures with each other. The control device 100 determines that the bath water heat recovery operation is possible when the detection temperature of the bath water recovery thermistor 91a is higher than the detection temperature of the high temperature heating thermistor 73a by a predetermined temperature or more. When it is determined that the bath water heat recovery operation is possible (YES in step S304), the process proceeds to step S306. When it is determined that the bath water heat recovery operation is not possible (NO in step S304), the process proceeds to step S314, and the heating operation is executed without executing the bath water heat recovery operation.

In step S306, the control device 100 determines whether or not to inquire the user about the execution of the bath water heat recovery operation. In the present embodiment, when the heat pump system 2 is operating in an operation mode inquiring the user about the necessity of the heat recovery operation, the inquiry is made to the user, and the heat pump system 2 automatically executes the heat recovery operation In the case of operating in the operation mode, the inquiry to the user is not executed. When the inquiry is executed to the user (YES in step S306), the process proceeds to step S308. When the inquiry to the user is not executed (NO in step S306), the process proceeds to step S312, and the bath water heat recovery operation is executed without executing the inquiry to the user.

In step S308, the controller 100 inquires of the user whether or not to execute the bath water heat recovery operation. In general, when the bath water heat recovery operation is performed prior to the heating operation, the rise of the heating temperature is delayed as compared with the case where the heating operation is performed without executing the bath water heat recovery operation. Therefore, the heat pump system 2 of the present embodiment calculates the time required for the bath water heat recovery operation and notifies the user through the remote controller. The user is prompted to input a command to perform the bath water heat recovery operation or an instruction to stop the bath water heat recovery operation through the remote controller. The time required for the bath water heat recovery operation is calculated on the basis of the capacity of the bath water in the bath 98, the detection temperature of the bath water recovery thermistor 91a, the detection temperature of the high temperature heating thermistor 73a, and the like.

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

In step S312, the control device 100 executes the bath water heat recovery operation. As a result, the remaining heat of the bath water is recovered to the heating water and can be used for the subsequent heating operation. When the bath water heat recovery operation is completed, the process proceeds to step S314.

In step S314, the controller 100 executes the heating operation. Thus, heating is performed.

Fig. 4 shows the flow of start determination of the bath water heat recovery operation and the heating water heat recovery operation to be performed after bathing by the user.

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

In step S404, it is determined whether or not the controller 100 can perform the bath water heat recovery operation. When it is determined that the bath water heat recovery operation is possible (YES in step S404), the process proceeds to step S406. When it is determined that the bath water heat recovery operation is not possible (NO in step S404), the process proceeds to step S408.

In step S406, the bath water heat recovery operation is performed. Thus, the remaining heat of the bath water is recovered to the heating water. When the bath water heat recovery operation is completed, the process proceeds to step S408.

In step S408, it is determined whether or not the controller 100 can perform the water heat recovery operation for heating. When it is determined that the heating water heat recovery operation is possible (YES in step S408), the process proceeds to step S410. When it is determined that the heating water heat recovery operation is not possible (NO in step S408), the processing of Fig. 4 is terminated.

In step S410, the controller 100 executes the water heat recovery operation for heating. As a result, the remaining heat of the heating water is recovered in the water for hot water supply and stored in the tank 10. When the heating water heat recovery operation is completed, the processing of Fig. 4 is terminated.

According to the process shown in Fig. 4, when the user takes a bath, he / she can automatically collect the remaining heat in the heating water from the bath water, recover the remaining heat in the hot water for heating from the heating water and store the heat in the tank 10. 4 does not show the processing relating to the inquiry to the user, but the configuration may be such that the inquiry to the user is executed similarly to the processing shown in Figs. 2 and 3.

FIG. 5 shows a flow of starting determination of the bath water heat recovery operation and the heating water heat recovery operation to be executed when the user turns on the hot water switch. The hot water bath switch referred to here is a switch that is provided on the remote controller and operates when the user wants to lower the temperature of the bath water stored in the bathtub 98. [

In step S502, the controller 100 waits until the hot water switch is turned on. When the hot water switch is turned on (YES in step S502), the process proceeds to step S504.

In step S504, it is determined whether or not the control device 100 can perform the bath water heat recovery operation. When it is determined that the bath water heat recovery operation is possible (YES in step S504), the process advances to step S506 to execute the bath water heat recovery operation. By performing the bath water heat recovery operation, heat recovery is performed on the heating water from the bath water temperature, and the temperature of the bath water stored in the bath water 98 lowers. When it is determined that the bath water heat recovery operation is not possible (NO in step S504), the process advances to step S508 to execute additional water heating operation. In the additional water running operation executed in the step S508, by supplying the predetermined amount of hot water for the hot water which is lower in temperature than the bath water stored in the bath 98 to the bath 98, the temperature of the bath water stored in the bath 98 .

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

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

According to the process shown in Fig. 5, when the user turns on the hot water bath switch, the temperature of the bathtub of the bathtub 98 can be lowered by the heat recovery from the bathtub water to the heating water. The amount of tap water used can be saved and the energy saving can be realized as compared with the case where the temperature of the bath water is lowered by the additional water to the bathtub 98. [ 5 does not show the processing relating to the inquiry to the user, but the configuration may be such that the inquiry to the user is executed similarly to the processing shown in Fig. 2 and Fig.

The embodiments of the present invention have been described in detail above, but these are merely examples and do not limit the claims. The techniques described in the claims include various modifications and changes to the specific examples described above.

The technical elements described in the present specification or drawings are to be used solely or in various combinations, and are not limited to combinations of the claims in the application. The technology described in the present specification or drawings can achieve a plurality of objectives at the same time, and achieving one of the objectives itself has technological usefulness.

2: Heat pump system 4: Tank unit
6: Heat pump unit 8: Heat source unit
10: tanks 10a, 10b, 10c: tank thermistor
20: tank water circulation passage 20a: tank water passage
20b: tank return passage 21: switching valve
22: Hot water circulating water circulating pump 23a:
23b: low temperature water return path 24: tap water introduction path
24a: first introduction route 24b: second introduction route
26a: hot water supply water supply thermistor 26b: hot water supply water return thermistor
28: water supply thermistor 30: mixing valve
32: tap water supply source 33: heat source bypass path
34: Bypass valve 36: First hot water tank
36a: Mixed thermistor 37: Hot water heating furnace
37a: Hot water thermistor 38:
39: second hot water tank 39a: hot water thermistor
40: bathtub with pouring tube 42: pouring solenoid valve
50: heat pump 52: refrigerant circulation path
54: Air heat exchanger 55: Outside temperature thermistor
56: fan 58: 3 fluid heat exchanger
60: expansion valve 62: compressor
70: Cistern 72: The heating king
72a: low temperature heating thermistor 73: first heating heating furnace
73a: high temperature heating thermistor 74: water circulation pump for heating
75: Low temperature heating circuit 76: High temperature heater
77: High temperature heating circulation path 78: Low temperature heater
78a: Heating bypass 78b: Bypass valve
79: Reheating circulation path 81: Burner for hot water supply
82: Heating burner 83: Reheating thermal valve
84: Second heating furnace 86: HP bypass
88: mixing valve 91: bath water circulation path
91a: bath water return thermistor 91b: bath water supply thermistor
91c: water level sensor 96:
97: Reheat heat exchanger 98: Bathtub
99: bath water circulation pump 100: control device

Claims (7)

And a hot water heater for storing the hot water for hot water from the water source in the hot water tank, circulating the hot water for water between the condenser and the hot water tank, and supplying hot water for hot water from the hot water tank to the hot water spot,
It is possible to carry out a heating operation in which the heat pump is operated to circulate heating energy to the condenser and circulate the heating energy heated in the condenser to the heating terminal. After the heating operation is performed, Wherein the first heat recovery operation is carried out in such a manner that the heat is circulated to the condenser and the water for hot water is circulated to the condenser so that heat is recovered from the heat for heating to the hot water in the condenser and the heat is accumulated in the low temperature tank.
The method according to claim 1,
It is possible to execute a heat storage operation in which the heat pump is operated to circulate the water for hot water supply to the condenser and the hot water for heating heated in the condenser is stored in the hot water tank,
Wherein the first heat recovery operation is performed prior to the heat accumulation operation when the temperature of the heat for heating is higher than the temperature of the hot water supplied to the condenser at the start of the heat accumulation operation.
The method according to claim 1,
And a reheating heat exchanger in which a heater exchanges heat between the number of bathtubs stored in the bath and the heat for heating,
And a second heat recovery operation for circulating the bath water to the reheating heat exchanger and circulating the heat for heating to the reheating heat exchanger so as to perform heat recovery from the bath water number to the heating heat in the reheating heat exchanger. .
The method of claim 3,
It is possible to execute a heating operation in which the heating pump is operated to circulate the heating-purpose fruit to the condenser, and the heating-purpose heating material heated in the condenser is circulated to the heating terminal,
Wherein the second heat recovery operation is performed prior to the heating operation when the temperature of the bathtub is higher than the temperature of the heating heat when the heating operation is started.
A heat pump including a condenser for compressing the refrigerant, a condenser for condensing the refrigerant by heat exchange between the heat for heating, an expander for decompressing the refrigerant, and an evaporator for evaporating the refrigerant,
And a heater for circulating the heating energy to each of the condenser, the heating terminal, and the reheat heat exchanger for exchanging heat between the bath water stored in the bathtub,
A second heat recovery operation for circulating the bath water to the reheating heat exchanger and circulating the heat for heating to the reheating heat exchanger to perform heat recovery from the bath water number to the heating heat in the reheating heat exchanger; It is possible to carry out a heating operation for circulating the heating oil heated in the condenser to the heating terminal,
Wherein the second heat recovery operation is performed prior to the heating operation when the temperature of the bathtub is higher than the temperature of the heating heat when the heating operation is started.
The method according to any one of claims 3 to 5,
Further comprising bathing detection means for detecting bathing of the user from the bathtub,
Wherein the second heat recovery operation is performed when the temperature of the bathtub water is higher than the temperature of the heating heat oil when the user's bathing is detected.
The method according to any one of claims 3 to 5,
Further comprising input means capable of allowing the user to input an instruction to lower the temperature of the bath water stored in the bathtub,
Wherein the second heat recovery operation is performed when the temperature of the bathtub water is higher than the temperature of the heating heat oil when an instruction to lower the temperature of the bath water stored in the bathtub is inputted.

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