KR20130141385A - Thermal apparatus - Google Patents

Abstract

Provided is a technology capable of performing an implantation determination in case that there is a concern that frost is attached to a heat pump performing a heating operation. The thermal apparatus disclosed in the present specification comprises a heat pump which is capable of performing a heating operation and a frost removal operation and which comprises a first heat exchanger for heat-exchange between the outside air and the refrigerant, a compressor, a second heat exchanger for heat-exchange between the refrigerant and heating media, and an expansion valve; a heat exchanger temperature detection means detecting the temperature of the first heat exchanger; and a time measuring means measuring the elapsed time from the start of the heating operation. The thermal apparatus is configured to perform a frost removal operation when the temperature of the first heat exchanger is less than a frost removal standard temperature after the elapsed time from the start of the heating operation reaches an implantation determination time. The thermal apparatus reduces the heating performance of the heat pump when the temperature of the first heat exchanger is less than a determination preparation temperature, which is higher than the frost removal standard temperature, before the elapsed time from the start of the heating operation reaches the implantation determination time. [Reference numerals] (AA) Start;(BB) End;(S10) Reduce the heating performance of the heat pump;(S12) Restore the heating performance of the heat pump;(S14) Heat pump temperature <= Frost removal reference temperature ?;(S16) Perform a frost removal operation;(S2) Start a timer counter;(S4) Elapsed time >= Implantation determination time ?;(S6) Temperature of outside air >= Reference temperature of outside air;(S8) Heat exchanger temperature <= Determination preparation temperature ?

Description

Opener {THERMAL APPARATUS}

The technology disclosed herein relates to a hot air balloon.

The patent document 1 is equipped with the 1st heat exchanger which heat-exchanges between external air and a refrigerant | coolant, the compressor which pressurizes a refrigerant | coolant, the 2nd heat exchanger which heat-exchanges between a refrigerant | coolant and a heat medium, and the expansion valve which pressure-reduces a refrigerant | coolant, Heating operation in which the refrigerant flowed out from the air flows into the first heat exchanger via the second heat exchanger and the expansion valve sequentially, and a defrosting operation in which the refrigerant flowed out of the compressor flows into the first heat exchanger without at least via the expansion valve. A heat pump capable of carrying out; Heat exchanger temperature detection means for detecting a temperature of the first heat exchanger; A hot air heater is provided, which includes a time-measuring means for measuring an elapsed time from the start of the heating operation of the heat pump. The hot air balloon is used after the elapsed time from the start of the heating operation of the heat pump reaches the implantation determination time (here, "determination of determination" refers to determining whether frost is attached or not), It is comprised so that defrosting operation of a heat pump may be performed when the temperature of a 1st heat exchanger is less than a defrosting reference temperature.

Patent Document 1: Japanese Patent Application Laid-Open No. 10-103818

The heat operation of the heat pump may be terminated in a short time depending on the condition of the heat load required for the hot air heater. If the heat operation of the heat pump is terminated in a short time, the heat operation of the heat pump is terminated before the concept of determination time elapses, and thus, the determination of implantation cannot be performed. Therefore, even if frost is attached to the heat pump, it may be left as it is without defrost operation. When the heat pump performs the heating operation, when there is a possibility that frost is attached, a technique capable of reliably performing an implantation determination is expected.

The present specification provides a technique for solving the above problems. In this specification, when the heat pump performs heating operation, when there exists a possibility that frost may adhere, it provides the technique which can carry out determination of a reliably.

The hot air device disclosed in this specification includes a first heat exchanger for exchanging heat between an outside air and a refrigerant, a compressor for pressurizing the refrigerant, a second heat exchanger for exchanging heat between the refrigerant and the heat medium, and an expansion valve for reducing the refrigerant. And a heating operation in which the refrigerant flowing out of the compressor flows into the first heat exchanger through the second heat exchanger and the expansion valve sequentially, and the castle flowing the refrigerant flowing out of the compressor into the first heat exchanger without at least passing through the expansion valve. A heat pump capable of performing a removal operation; Heat exchanger temperature detection means for detecting a temperature of the first heat exchanger; And counting means for measuring the elapsed time from the start of the heating operation of the heat pump. The hot air heater performs defrosting operation of the heat pump when the temperature of the first heat exchanger is lower than the defrosting reference temperature after the elapsed time from the start of the heat pump heating operation reaches the decision determination time. Consists of. This hot air heater heats the heat pump when the temperature of the first heat exchanger is lower than the determination preparation temperature higher than the defrosting reference temperature before the elapsed time from the start of the heat pump heating operation reaches the decision determination time. Reduce your ability.

In the above-described hot air heater, if the temperature of the first heat exchanger is lower than the determination preparation temperature before the elapsed time from the start of the heating operation of the heat pump reaches the landing determination time, frost is attached to the first heat exchanger. I think there is concern. In such a case, in the above-mentioned hot air heater, by reducing the heating capacity of the heat pump, the heating operation of the heat pump is prevented from being terminated in a short time, thereby securing the operation time necessary for the determination of the implantation. With such a configuration, it is possible to reliably determine the frost when the frost may be attached to the first heat exchanger.

The hot air is further provided with an outside air temperature detecting means for detecting the outside air temperature, and when the outside air temperature is higher than the predetermined temperature, it is preferable not to reduce the heating capacity of the heat pump.

If the outside air temperature is higher than the predetermined temperature, there is no possibility that frost is attached to the heat exchanger. Therefore, it is not necessary to perform the conception of determination based on the heat exchanger temperature. According to the hot air heater described above, it is possible to prevent a situation in which the heating capacity of the heat pump is unnecessarily reduced.

It is preferable that the above-mentioned hot air heater further has an auxiliary heat source for heating the heat medium by combustion of fuel gas.

According to the above-mentioned hot air heater, when the heating capacity of the heat pump is reduced in order to secure the implantation determination time, the heat quantity insufficient by the auxiliary heat source can be compensated for, and the necessary heat quantity can be continuously supplied.

According to the technique disclosed by this specification, when there exists a possibility that frost may adhere when a heat pump performs a heating operation, it can reliably determine a concept.

1 is a diagram schematically showing the configuration of a hot water supply heating system 2.
2 is a flowchart of defrosting determination processing;

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described in detail based on drawing.

<< Example >>

As shown in FIG. 1, the hot water supply heating system 2 according to the present embodiment includes a hot water supply system 104, a heat pump system 106, a heating system 108, an outside air temperature sensor 40, and control. The apparatus 100 is provided.

Heat pump system 106 includes a heat pump 50. The heat pump 50 includes a refrigerant circulation path 52 for circulating a refrigerant (for example, HFC refrigerant R410A or C0 ₂ refrigerant), an air heat exchanger (evaporator) 54, a fan 56, A compressor 62, a three-fluid heat exchanger 58, an expansion valve 60, a refrigerant bypass path 64, and an opening / closing valve 66 are provided. The refrigerant circulation path 52 passes through the three-fluid heat exchanger 58. The air heat exchanger 54, the compressor 62, and the expansion valve 60 are provided in the refrigerant circulation path 52.

The air heat exchanger 54 (corresponding to the first heat exchanger) exchanges heat between the air blown by the fan 56 and the refrigerant in the refrigerant circulation path 52. As described later, the air heat exchanger 54 is supplied with a refrigerant in a low pressure low temperature liquid state after passing through the expansion valve 60. The air heat exchanger 54 heats the refrigerant by exchanging heat with the refrigerant. The refrigerant is vaporized by heating, and becomes a gaseous state of relatively high temperature and low pressure. At the inlet side of the air heat exchanger 54, a temperature sensor 54a (corresponding to the heat exchanger temperature detection means) for detecting the temperature of the refrigerant flowing into the air heat exchanger 54 is provided. In this embodiment, the temperature detected by the temperature sensor 54a is treated as the temperature of the air heat exchanger 54.

The compressor 62 compresses the refrigerant in the refrigerant circulation path 52 and sends it to the three-fluid heat exchanger 58. The compressor 62 is supplied with a refrigerant passing through the air heat exchanger 54. That is, the compressor 62 is supplied with a gaseous refrigerant having a relatively high temperature and low pressure. As the refrigerant is compressed by the compressor 62, the refrigerant is in a gaseous state of high temperature and high pressure. The compressor 62 sends the high temperature, high pressure gaseous refrigerant after compression to the three-fluid heat exchanger 58 side. As a result, 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.

The high temperature and high pressure gaseous refrigerant sent from the compressor 62 is supplied to the refrigerant circulation path 52 of the three-fluid heat exchanger 58 (corresponding to the second heat exchanger). The three-fluid heat exchanger 58 can heat-exchange between the refrigerant | coolant in the refrigerant | coolant circulation path 52, and the water (corresponding to a heating medium for hot water supply) in the tank water circulation path 20 mentioned later. The three-fluid heat exchanger 58 can perform heat exchange between the refrigerant in the refrigerant circulation path 52 and the water (corresponding to the heating medium for heating) in the heat recovery path 88 described later. The refrigerant loses heat and condenses as a result of heat exchange. As a result, the refrigerant is in a liquid state of relatively low temperature and high pressure.

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

One end of the refrigerant bypass path 64 is connected to an upstream side of the expansion valve 60 in the refrigerant circulation path 52, and the other end thereof is connected to a downstream side of the expansion valve 60 in the refrigerant circulation path 52. That is, the refrigerant bypass path 64 connects the upstream side and the downstream side of the expansion valve 60. The refrigerant bypass path 64 is provided with an opening / closing valve 66 that opens and closes the refrigerant bypass path 64.

Therefore, when the compressor 62 is operated in a state where the on-off valve 66 is closed, the refrigerant in the refrigerant circulation path 52 does not flow in the refrigerant bypass path 64, but the air heat exchanger 54 and the compressor 62. ), Three-fluid heat exchanger (58), expansion valve (60) in order. In this case, in the three-fluid heat exchanger 58, water in the tank water circulation path 20 or water in the heat recovery path 88 is heated. Operating the heat pump 50 in this manner is referred to as heating operation of the heat pump 50.

On the other hand, when the compressor 62 is operated with the open / close valve 66 open, the refrigerant in the refrigerant circulation path 52 is an air heat exchanger 54, a compressor 62, a three-fluid heat exchanger 58, and a refrigerant bypass. It is circulated in the order of the path 64 and does not flow to the expansion valve 60. At this time, the circulation pump 22 is stopped and the opening of the control valve 90 is completely opened toward the bypass bypass 94 for heating. In the three-fluid heat exchanger 58, the tank water circulation path 20 Water or water in the heat recovery furnace 88 is not heated. The operation of the heat pump 50 in this manner is referred to as defrosting operation of the heat pump 50.

The hot water supply system 104 includes a tank 10, a tank water circulation path 20, a tap water introduction path 24, a supply path 36, and a burner heating device 81.

The tank 10 stores hot water heated by the heat pump 50. The tank 10 is of a closed type and is covered on the outside by a heat insulating material. In the tank 10, water is stored up to full water. The thermistors 12, 14, 16 and 18 are attached to the tank 10 at substantially equal intervals in the height direction of the tank 10. As shown in FIG. Each thermistor 12, 14, 16, 18 measures the temperature of the water at its installation position.

The tank water circulation path 20 has an upstream end connected to the lower part of the tank 10, and a downstream end connected to the upper part of the tank 10. The tank water circulation path 20 is provided with a circulation pump 22. The circulation pump 22 delivers the water in the tank water circulation path 20 from the upstream side to the downstream side. In addition, as described above, the tank water circulation path 20 passes through the three-fluid heat exchanger 58. For this reason, when the heat pump 50 is operated, the water in the tank water circulation path 20 is heated by the three fluid heat exchanger 58. Therefore, when the circulation pump 22 and the heat pump 50 are operated, the water at the bottom of the tank 10 is sent to the three-fluid heat exchanger 58 to be heated, and the heated water is returned to the top of the tank 10. Lose. The tank water circulation path 20 is a channel for heat storage of the tank 10.

The upstream end of the tap water introduction passage 24 is connected to the tap water supply source 32. The downstream side of the tap water introduction passage 24 branches into the first introduction passage 24a and the second introduction passage 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 passage 24b is connected in the middle of the supply passage 36. The check valve 26 is interposed in the first introduction passage 24a. The check valve 28 is interposed in the 2nd introduction path 24b.

The upstream end of the supply passage 36 is connected to the upper portion of the tank 10. As described above, the second introduction passage 24b of the tap water introduction passage 24 is connected in the middle of the supply passage 36. A mixing valve 30 is interposed between the supply passage 36 and the second introduction passage 24b. The mixing valve 30 adjusts the ratio of the flow rate of the water flowing into the supply passage 36 from the upper portion of the tank 10 and the flow rate of the water flowing into the supply passage 36 from the second introduction passage 24b. A burner heating device 81 (corresponding to an auxiliary heat source device) is interposed in the supply path 36 downstream from the connection portion with the second introduction path 24b. The burner heater 81 heats the water in the supply passage 36. The upstream side and the downstream side of the burner heating apparatus 81 are connected by the burner bypass passage 33. The bypass valve 34 is interposed in the burner bypass path 33. The downstream end of the supply passage 36 is connected to the hot water supply 38.

The heating system 108 includes a cistern 70, a heating water circulation path 71, a burner heating device 82, and a heater 76. The heating water circulation path 71 includes a heating path 72, a heating return path 84, a control valve 90, a heat recovery path 88, a heating bypass path 94, and a circulation flow path 96. Equipped. The heating water circulation path 71 is a channel for circulating water in the cistern 70. The water in the heating water circulation path 71 is heated by the burner heater 82 and the three fluid heat exchanger 58.

The cistern 70 is a container in which the upper part is open, and stores water inside. The downstream end of the circulation flow path 96 and the upstream end of the heating channel 72 are connected to the cistern 70. Water flows into the circulation passage 96 from the circulation passage 96. Water in the cistern 70 is introduced into the heating path 72.

The heating path 72 has an upstream end connected to the cistern 70 and a downstream end connected to the inlet of the heater 76. The circulation pump 74 is interposed in the heating channel 72. The circulation pump 74 delivers the water in the heating channel 72 downstream. A burner heating device 82 (corresponding to an auxiliary heat source device) is interposed between the heating path 72 on the upstream side of the heater 76. The burner heater 82 heats the water in the heating passage 72. The burner heater 82 has a higher capability of heating the water circulating in the heating water circulation path 71 than the heat pump 50. In other words, the burner heater 82 has a larger amount of heating per unit time than the heat pump 50. Water heated by the burner heater 82 is supplied to the heater 76.

The radiator 76 heats the living room using the heat of water supplied from the heating radiator 72. When water supplied from the heating path 72 is used for heating, heat is taken away to become relatively low temperature water. The relatively low temperature water after being used for heating is introduced into the heating return path 84.

The heating return path 84 has an upstream end connected to an outlet of the heater 76, and a downstream end connected to an upstream end of the heating bypass 94 and an upstream end of the heat recovery path 88. The thermistor 86 is interposed in the heating return path 84. Thermistor 86 measures the temperature of the water in the heating return path 84.

The heat recovery path 88 has an upstream end connected to an upstream end of the heating bypass path 94 and a downstream end of the heating return path 84, and the downstream end of the heat recovery path 88 and the downstream end of the heating bypass path 94 and the circulation flow path 96. Is connected to the upstream end. The heat recovery path 88 passes through the three-fluid heat exchanger 58. For this reason, when the heat pump 50 is operated, the water in the heat recovery path 88 is heated by the three fluid heat exchanger 58. Thermistor 92 is interposed upstream of the three-fluid heat exchanger 58 of the heat recovery path 88. Thermistor 92 measures the temperature of water in heat recovery path 88 before passing through trifluid heat exchanger 58.

The heating bypass 94 has an upstream end connected to a downstream end of the heating return path 84 and an upstream end of the heat recovery path 88, and the downstream end of the heating bypass 94 of the heat recovery path 88 and the circulation path 96. It is connected to the upstream end. In other words, the heating bypass passage 94 bypasses the upstream and downstream sides of the three-fluid heat exchanger 58.

The adjustment valve 90 is attached to the downstream end of the heating return path 84, the upstream end of the heat recovery path 88, and the upstream end of the heating bypass path 94. The regulating valve 90 changes the flow rate of the water passing through the heat recovery path 88 (the flow rate of the water passing through the three-fluid heat exchanger 58) and the flow rate of the water passing through the heating bypass path 94. You can change the ratio. As the regulating valve 90 of the present embodiment, for example, a three-way valve is used.

The circulation flow path 96 has an upstream end connected to the downstream end of the heat recovery path 88 and the downstream end of the heating bypass path 94, and the downstream end connected to the cisterne 70.

The outside air temperature sensor 40 is provided near the tank 10 of the hot water supply system 104, and can measure the outside air temperature.

The control device 100 is electrically connected to the hot water supply system 104, the heat pump system 106, the heating system 108, and the outside air temperature sensor 40, and controls the operation of each component. The control apparatus 100 is equipped with the timer 100a (corresponding to a monitoring means).

(Operation of hot water supply heating system)

Subsequently, the operation of the hot water supply heating system 2 of the present embodiment will be described. Hereinafter, the heat storage operation, the hot water operation, the heating operation, and the defrosting operation performed by the hot water heating system 2 will be described.

(Heat storage operation)

The heat storage operation is an operation for heating the water in the tank 10 by the heat generated by the heat pump 50. When the execution of the heat storage operation is instructed by the control device 100, the heat pump 50 operates and the circulation pump 22 rotates. At this time, the heat pump 50 performs the heating operation which drives the compressor 62 in the state which the shut-off valve 66 closed.

By operating the heat pump 50 in a state where the shutoff valve 66 is closed, the refrigerant in the refrigerant circulation path 52 passes through the air heat exchanger 54, the compressor 62, the three fluid heat exchanger 58, and the expansion valve ( Circulated in the order of 60). 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. Moreover, when the circulation pump 22 rotates, the water in the tank 10 circulates in the tank water circulation path 20. That is, water present in the lower part of the tank 10 is introduced into the tank water circulation path 20, and is heated by the heat of the refrigerant in the refrigerant circulation path 52 when the introduced water passes through the three-fluid heat exchanger 58. The heated water is returned to the top of the tank 10. As a result, hot water is stored in the tank 10. A layer of hot water is formed on the top of the tank 10 and a layer of low temperature water is formed on the bottom.

(Hot water operation)

The hot water supply operation is an operation for supplying water in the tank 10 to the hot water supply 38. The hot water supply operation can be executed even during the above-described heat storage operation. When the hot water supply 38 is opened, tap water flows into the lower portion of the tank 10 from the tap water introduction path 24 (the first introduction path 24a) by the water pressure from the tap water supply source 32. At the same time, hot water in the upper portion of the tank 10 is supplied to the hot water supply 38 through the supply passage 36.

The control apparatus 100 drives the mixing valve 30 when the temperature of the water supplied from the tank 10 to the supply path 36 (that is, the detected temperature of the thermistor 12) is higher than the hot water set temperature. Tap water is introduced into the supply passage 36 from the second introduction passage 24b. Therefore, the water supplied from the tank 10 and the tap water supplied from the second introduction passage 24b are mixed in the supply passage 36. The controller 100 adjusts the opening degree of the mixing valve 30 so that the temperature of the water supplied to the hot water supply 38 matches the hot water set temperature. On the other hand, when the temperature of the water supplied from the tank 10 to the supply path 36 is lower than the hot water set temperature, the control device 100 operates the burner heating device 81. Thus, the water passing through the supply passage 36 is heated by the burner heater 81. The control device 100 controls the output of the burner heating device 81 so that the temperature of the water supplied to the hot water supply 38 matches the hot water setting temperature.

(Heating operation)

Heating operation is operation which heats a living room by operating the heater 76. FIG. When execution of the heating operation is instructed by the user, the control apparatus 100 adjusts the opening degree of the adjustment valve 90 according to the load of the heater 76, and rotates the circulation pump 74. As a result, all or part of the water introduced from the heating return path 84 passes through the three-fluid heat exchanger 58. Water in the cistern 70 passes through a heating path 72, a burner heater 82, a heater 76, a heating return 84, a heat recovery path 88, and a circulation flow path 96. A path back to) is formed. At the same time, controller 100 operates burner heater 82. In addition, the control apparatus 100 drives the compressor 62 in a state where the on-off valve 66 is closed to heat the heat pump 50. As a result, the temperature of the refrigerant in the refrigerant circulation path 52 passing through the three-fluid heat exchanger 58 becomes high. For this reason, the water circulating in the path is heated by the burner heater 82 when passing through the heating path 72, and the refrigerant in the three-fluid heat exchanger 58 when passing through the heat recovery path 88. It is heated by the heat of the refrigerant in the circulation path 52. As a result, the heater 76 is supplied with the water heated using both the burner heater 82 and the heat pump 50. The heater 76 uses the heat of the supplied water to heat the living room.

In heating operation, the opening degree of the control valve 90 is adjusted as needed. In the heating operation, the operation of the burner heating device 82 is adjusted as necessary.

(Defrosting operation)

The defrosting operation is an operation for removing the property attached to the air heat exchanger (54) of the heat pump (50) in a situation where the outdoor air temperature is low. The air heat exchanger (54) of the heat pump (50) performs heat exchange between the outside air and the refrigerant to heat the refrigerant. Therefore, since the temperature of the air heat exchanger 54 tends to be low in the situation where the outside air temperature is low, the frost easily adheres to the surface of the air heat exchanger 54. If frost adheres to the surface of the air heat exchanger 54, heat exchange between the outside air and the refrigerant is inhibited. Therefore, in the hot water heating system 2 of the present embodiment, when an frost is determined to determine whether the frost is attached to the air heat exchanger 54 and the frost is determined to be attached to the air heat exchanger 54. The defrosting operation for removing the frost attached to the air heat exchanger 54 is performed.

In the hot water supply heating system 2 of the present embodiment, when the heat pump 50 starts the heating operation in the heat storage operation, the heating operation, or the like, an implantation determination process shown in FIG. 2 is performed.

In step S2, the count of the timer 100a which measures the elapsed time from the start of the heating operation of the heat pump 50 is started.

In step S4, it is determined whether the elapsed time measured by the timer 100a has reached a predetermined idea determination time (for example, 20 minutes). If the elapsed time does not reach the implantation determination time (NO), the process proceeds to step S6.

In step S6, it is determined whether the outside air temperature detected by the outside air temperature sensor 40 exceeds a predetermined reference outside air temperature (for example, 3 ° C). When the outside air temperature exceeds the reference outside air temperature (YES in step S6), since the outside air temperature is high and there is no possibility that frost is attached to the air heat exchanger 54, the conception determination processing in FIG. 2 is completed. If the outside air temperature is equal to or less than the reference outside air temperature (NO at step S6), the processing proceeds to step S8.

In step S8, it is determined whether or not the heat exchanger temperature detected by the temperature sensor 54a is equal to or less than a predetermined judgment preparation temperature (for example, -2 ° C). At the time of performing step S8, since the temperature of the refrigerant has not stabilized yet since the time has not elapsed since the heating operation of the heat pump 50 is started, accurate determination of the idea cannot be made. However, when the heat exchanger temperature is somewhat low at the time of performing step S8, it may be considered that frost may be attached. Therefore, it is necessary to reliably determine the implantation. In step S8, when the heat exchanger temperature is equal to or less than the determination preparation temperature (YES), the flow proceeds to step S10. In step S8, when the heat exchanger temperature exceeds the judgment preparation temperature (NO), the flow returns to step S4.

In step S10, the heating capability of the heat pump 50 is limited and the heating capability of the heat pump 50 is reduced. In order to reduce the heating capability of the heat pump 50, the rotation speed of the compressor 62 is reduced, for example. In the hot water heating system 2 of the present embodiment, the rotation speed of the compressor 62 is reduced to the minimum rotation speed. Thereby, the situation where the heat pump 50 complete | finishes a heating operation in a short time can be prevented. After step S10, the process returns to step S4.

If the elapsed time measured by the timer 100a reaches the implantation determination time in step S4, the process proceeds to step S12.

In step S12, if the heating capacity of the heat pump 50 is reduced in step S10, the heating capacity of the heat pump 50 is returned to normal.

In step S14, it is determined whether or not the heat exchanger temperature detected by the temperature sensor 54a is equal to or less than a predetermined defrosting reference temperature (for example, -5 ° C). At the time of performing step S14, the elapsed time from the start of the heating operation of the heat pump 50 exceeds the determination time, and the temperature of the refrigerant of the heat pump 50 is stable. For this reason, accurate implantation determination can be performed. In step S14, when the heat exchanger temperature exceeds the defrosting reference temperature (NO), it is determined that the frost is not attached to the air heat exchanger 54, and the frosting determination processing shown in FIG. 2 is completed. If the heat exchanger temperature is equal to or lower than the defrosting reference temperature in step S14 (YES), it is determined that frost is attached to the air heat exchanger 54, and the process proceeds to step S16.

In step S16, defrost operation of the heat pump 50 is performed. When the heating operation is performed at the start of the defrosting operation, that is, when the circulation pump 74 is driven, the controller 100 controls the opening degree of the adjustment valve 90 to the heating bypass 94. Fully open to the side. When the defrosting operation is started, when the heat storage operation is being performed, that is, when the circulation pump 22 is driven, the circulation pump 22 is stopped. In this state, the control device 100 opens the open / close valve 66 of the heat pump 50. When the compressor 62 is operated while the on-off valve 66 is opened, the refrigerant in the refrigerant circulation path 52 passes through the air heat exchanger 54, the compressor 62, the three fluid heat exchanger 58, and the refrigerant bypass path. It is circulated in the order of 64 and does not flow to the expansion valve 60. In this case, the refrigerant flowing out of the compressor 62 passes through the three-fluid heat exchanger 58 without dissipating heat, and then flows into the air heat exchanger 54 at a high temperature via the refrigerant bypass path 64. . As a result, frost adhering to the surface of the air heat exchanger 54 can be melted. When a predetermined time (for example, 5 minutes) has elapsed since the open / close valve 66 is opened, the open / close valve 66 is closed to finish the defrosting operation. In addition, when the circulation pump 22 is driven before the defrosting operation is started, the driving of the circulation pump 22 is restarted. When the heating operation is performed before the start of the defrosting operation, the control valve 90 is returned to the state before the start of the defrosting operation.

According to the hot water supply heating system 2 of the present embodiment, the temperature of the air heat exchanger 54 is higher than the defrosting reference temperature before the elapsed time from the start of the heating operation of the heat pump 50 reaches the determination time. When the temperature is below the high determination preparation temperature, the heating capacity of the heat pump 50 is reduced. As a result, when there is a possibility that frost is attached to the air heat exchanger 54, the heat pump 50 is prevented from terminating the heating operation in a short time, so that the operation time necessary for carrying out the determination of the implantation can be performed. It can be secured. When there is a possibility that frost is attached to the air heat exchanger 54, it is possible to reliably determine the implantation.

The hot water heating system 2 of the present embodiment is provided with a burner heating device 81 and a burner heating device 82. Therefore, in the defrosting determination process of FIG. 2, even when the heating capability of the heat pump 50 is reduced, burner heating apparatuses 81 and 82 can compensate for the insufficient heat amount and can continuously supply the required heat amount. have.

In the hot water heating system 2 according to the present embodiment, when the outside air temperature detected by the outside air temperature sensor 40 exceeds the reference outside air temperature, there is no possibility that frost is attached, and an idea based on the heat exchanger temperature is determined. Do not do it. By setting it as such a structure, the situation which unnecessarily reduces the heating capability of the heat pump 50 in the defrosting determination process of FIG. 2 can be prevented. By utilizing the heating capacity of the heat pump 50 to the maximum, the energy efficiency of the hot water heating system 2 can be improved.

Further, in the above embodiment, the temperature of the refrigerant detected by the temperature sensor 54a provided at the inlet side of the air heat exchanger 54 is treated as the temperature of the air heat exchanger 54. However, the air heat exchanger 54 It is good also as a structure which measures the temperature of itself by a thermistor etc. directly.

In the above embodiment, in the three-fluid heat exchanger 58, the heat exchange between the refrigerant of the heat pump 50 and the water from the tank 10 (corresponding to the heat medium for hot water supply), and the heat pump 50 The structure which performs both heat exchange with the refrigerant | coolant of this and the water (it corresponds to a heating medium for heating) from the cisterna 70 was demonstrated. Contrary to this, instead of the three-fluid heat exchanger 58, an ordinary liquid / liquid heat exchanger may be used to perform only heat exchange between the refrigerant of the heat pump 50 and the water from the tank 10, The heat exchange between the refrigerant of the heat pump 50 and the water from the cistern 70 may be performed.

In the above-described embodiment, the refrigerant bypass path 64 connects the upstream side and the downstream side of the expansion valve 60, and in the defrosting operation, the refrigerant flowing out of the compressor 62 passes through the expansion valve 60. The configuration introduced into the air heat exchanger 54 without passing through was described. Unlike this, the refrigerant bypass path 64 connects the upstream side of the three-fluid heat exchanger 58 and the downstream side of the expansion valve 60, so that the refrigerant flowed out of the compressor 62 in the defrosting operation. 3 may be introduced into the air heat exchanger 54 without passing through the three-fluid heat exchanger 58 and the expansion valve 60.

As mentioned above, although the specific example of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes to the specific examples exemplified above. The technical elements described in this specification or the drawings exert their technical usefulness solely or in various combinations, and are not limited to combinations of claim descriptions at the time of filing. In addition, the techniques exemplified in the present specification or drawings are intended to achieve a plurality of objectives at the same time, and achieving one of them is technically useful.

2-hot water heating system 10-tank
12,14,16,18-Thermistor 20-Tank water circuit
22-Circulation pump 24-Tap water introduction
24a-first introduction furnace 24b-second introduction furnace
26-Check Valve 28-Check Valve
30-Mixing valve 32-Tap water source
33-Burner Bypass 34-Bypass Valve
36-38-Supply Hot Water
40-Ambient temperature sensor 50-Heat pump
52-Refrigerant circuit 54-Air heat exchanger
54 a-Temperature sensor 56-Fan
58-3 Fluid Heat Exchanger 60-Expansion Valves
62-Compressor 64-Refrigerant Bypass
66-Valve 70-Cistern
71-Heating water circuit 72-Heating road
74-circulating pump 76-heater
81,82-Burner Heaters 84-Heating Return
86-Thermistor 88-Heat Recovery
90-Regulating valve 92-Thermistor
94-96-Circulating flow path with heating bypass
100-control unit 100a-timer
104-Hot Water System 106-Heat Pump System
108-heating system

Claims (3)

And a first heat exchanger for exchanging heat between the outside air and the refrigerant, a compressor for pressurizing the refrigerant, a second heat exchanger for exchanging heat between the refrigerant and the heat medium, and an expansion valve for reducing the refrigerant. Heat capable of carrying out a heating operation in which the second heat exchanger and the expansion valve are sequentially introduced into the first heat exchanger and a defrost operation in which the refrigerant discharged from the compressor is introduced into the first heat exchanger without at least passing through the expansion valve. A pump;
Heat exchanger temperature detection means for detecting a temperature of the first heat exchanger;
And time means for measuring the elapsed time from the start of the heating operation of the heat pump,
A hot air heater configured to perform defrosting operation of the heat pump when the temperature of the first heat exchanger falls below the defrosting reference temperature after the elapsed time from the start of the heat operation of the heat pump reaches the defrosting determination time. ,
When the temperature of the first heat exchanger falls below the determination preparation temperature higher than the defrosting reference temperature, the heating capacity of the heat pump is reduced before the elapsed time from the start of the heating operation of the heat pump reaches the determination decision time. Hot air, characterized in that.
The method according to claim 1,
It is further provided with an outside air temperature detecting means for detecting the outside air temperature,
A hot air heater characterized by not reducing the heating capacity of the heat pump when the outside air temperature is higher than the predetermined temperature.
The method according to claim 1 or 2,
And an auxiliary heat source for heating the heat medium by combustion of the fuel gas.

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