KR101548416B1 - Heat pump type hot water supply heater - Google Patents

Abstract

(Problem) Defrost the outdoor heat exchanger reliably.
A heat pump cycle (110) including an outdoor heat exchanger (111) circulating the refrigerant only in the same direction to exchange heat between the outside air and the refrigerant; a heat pump cycle (110) for circulating the liquid to the heating device A heating circuit for heating or heating hot water, a heat exchanger (114) for hot water heating for heat exchange between the refrigerant and the liquid and the water, and a heating circuit And a heater 130 for heating water. When defrosting the outdoor heat exchanger 111 in the heat pump cycle 110 with the amount of heat of the refrigerant, the liquid in the heating circuit is not circulated for defrosting The outdoor heat exchanger 111 is normally defrosted only by the circulation of the refrigerant in the heat pump cycle 110. If the amount of heat of the refrigerant can not be defrosted, the liquid in the heating circuit is circulated, (110) by circulating the refrigerant in the heat pump cycle (110) while supplementing the amount of heat of the refrigerant to the hot water heating heat exchanger (114) by the heat exchanger (130) (111) to perform hybrid defrosting.

Description

{HEAT PUMP TYPE HOT WATER SUPPLY HEATER}

The present invention relates to a heat pump type hot water heater, and more particularly, to a heat pump type hot water heater which can be used in a cold place.

BACKGROUND ART [0002] As a prior art which discloses a heat pump type hot water heater that causes a refrigerant to flow in the same direction in the same path as that during normal operation during a defrosting operation, Japanese Patent Laid-Open No. 2003-90653 Patent Document 1). In the heat pump type hot water heater described in Patent Document 1, when the defrosting operation of the outdoor heat exchanger is performed, the valve opening degree of the pressure reducing valve is maximized, the water pump is stopped, and the heat pump cycle Circulating.

Japanese Patent Laid-Open Publication No. 2009-243747 (Patent Document 2) discloses a heat pump type hot water heater capable of transferring the heat of the refrigerant to the water flowing through the hot water pipe and the water flowing through the heating pipe.

In the heat pump type hot water heater described in Patent Document 2, the refrigerant pipe, the floor heating pipe and the hot water pipe are in contact with each other and stacked. As a result, the refrigerant pipe and the floor heating pipe, the floor heating pipe and the hot water pipe, and the hot water pipe and the refrigerant pipe are thermally coupled, respectively.

Patent Document 1: Japanese Patent Application Laid-Open No. 2003-90653 Patent Document 2: JP-A-2009-243747

In the heat pump type hot water heater, in order to prevent water from freezing in the piping for hot water supply, defrosting can not be performed by a reverse cycle (cooling operation) in which the direction of flow of the refrigerant is opposite to that in the heating operation like the air conditioner .

Thus, the defrost capability depends on the amount of heat that the refrigerant circulating in the heat pump cycle has. When the amount of heat of the refrigerant is insufficient for defrosting, defrosting of the outdoor heat exchanger can not be sufficiently performed. As a result, problems such as unstable heat exchange performance in the outdoor heat exchanger, drainage failure due to re-freezing of the drain, and the like have occurred. Further, in order to avoid such a phenomenon, the defrosting operation is frequently performed, which hinders normal operation.

An object of the present invention is to provide a heat pump type hot water heater which can reliably defrost the outdoor heat exchanger.

A heat pump type hot water heater according to the present invention includes a heat pump cycle including an outdoor heat exchanger for circulating refrigerant only in the same direction and exchanging heat between the outside air and the refrigerant, a heating circuit for circulating the liquid to the heating device , A hot water supply circuit for storing hot water or hot water, a hot water heat exchanger for heat exchange between the refrigerant and the liquid and the water, a heating circuit and a hot water supply circuit, And a heater. In the heat exchanger for hot water heating, the liquid pipe through which the liquid flows and the water pipe through which the water flows indirectly come in contact with each other through the refrigerant pipe, so that the refrigerant pipe through which the coolant flows is interposed. When defrosting the outdoor heat exchanger by the amount of heat of the refrigerant at the time of defrosting the outdoor heat exchanger in the heat pump cycle without circulating the liquid in the heating circuit for defrosting, The outdoor heat exchanger is normally defrosted only by circulation of the refrigerant, and when the amount of heat of the refrigerant can not be defrosted, the liquid is heated by the heater while circulating the liquid in the heating circuit, and at the same time, The refrigerant is circulated through the outdoor heat exchanger while the heat of the refrigerant is supplemented to the hot water heating heat exchanger to perform hybrid defrosting.

In one aspect of the present invention, the heat pump type hot water heater includes a temperature measuring device for measuring at least one of the outside temperature and the temperature of the outdoor heat exchanger. It is determined on the basis of the measurement result by the temperature measuring device whether or not the defrosting can be performed by the amount of the refrigerant when defrosting in the heat pump cycle.

In one aspect of the present invention, whether or not the defrosting can be performed by the amount of heat of the refrigerant at the time of defrosting in the heat pump cycle is determined based on the cumulative number of times of normal defrosting during operation.

In one aspect of the present invention, the heat pump type hot water heater includes a temperature measuring device for measuring at least one of the outside temperature and the temperature in the outdoor heat exchanger. Whether or not the defrosting of the refrigerant at the time of defrosting in the heat pump cycle can be performed is determined on the basis of the measurement result by the temperature measuring instrument and the cumulative number of defrosting during operation.

According to the present invention, the outdoor heat exchanger can reliably defrost.

1 is a schematic diagram showing a configuration of a heat pump type hot water heater according to Embodiment 1 of the present invention;
Fig. 2 is a flow chart showing a flow up to the start of normal defrosting or hybrid defrosting in the heat pump type hot water heater according to the present embodiment
Fig. 3 is a flowchart showing a flow up to the start of normal defrosting or hybrid defrosting in the heat pump type hot water heater according to the second embodiment of the present invention. Fig.
Fig. 4 is a flowchart showing a flow up to the start of normal defrosting or hybrid defrosting in the heat pump type hot water heater according to Embodiment 3 of the present invention; Fig.

Hereinafter, a heat pump type hot water heater according to Embodiment 1 of the present invention will be described. In the following description of the embodiments, the same or corresponding portions in the drawings are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)

1 is a system diagram showing the configuration of a heat pump type hot water heater according to Embodiment 1 of the present invention. 1, a heat pump type hot water heater 100 according to Embodiment 1 of the present invention includes a heat pump cycle 110 for circulating a refrigerant, a heating circuit for circulating the liquid to the heating device, And a hot water supply circuit for hot water or hot water.

As the refrigerant circulating through the heat pump cycle 110, an HFC refrigerant such as R410A or a natural refrigerant such as CO ₂ can be used. As the liquid circulating in the heating circuit, water or antifreeze can be used.

The heat pump cycle 110 includes a compressor 113 for compressing refrigerant, a heat exchanger 114 for heating the liquid and the water by heat exchange between the refrigerant flowing out of the compressor 113 and the liquid and water, An expansion valve 116 for expanding the refrigerant flowing out of the heating heat exchanger 114 and an outdoor heat exchanger 111 for exchanging heat between the refrigerant expanded through the expansion valve 116 and the outside air to heat the refrigerant .

The compressor 113, the hot water heating heat exchanger 114, the expansion valve 116 and the outdoor heat exchanger 111 are connected by a refrigerant pipe 117. A bypass pipe 118 for bypassing the expansion valve 116 is connected to the refrigerant pipe 117. The bypass piping 118 is provided with an electromagnetic valve 115 for opening and closing the bypass piping 118.

The outdoor heat exchanger 111 is arranged so that a fan 112 for blowing the outside air to the outdoor heat exchanger 111 is opposed.

The heating circuit includes a heater 130 for further heating the liquid heated by the heat exchange with the refrigerant in the heat exchanger 114 for hot water heating, a floor heating device 130 for heating the floor by flowing the heated liquid under the floor, A circulation pump 144 for circulating liquid between the hot water heating heat exchanger 114 and the floor heating device 140 and a heat exchanger 114 for hot water heating.

In the present embodiment, a gas heater is used as the heater 130, but the heater 130 is not limited to this and may be, for example, an electric heater. Further, although the floor heating device 140 is used as a heating device, the heating device is not limited to this, and may be, for example, a heating device for heating a window or a wall. Further, the heating device may be an air conditioner using a liquid instead of a refrigerant.

The hot water heating heat exchanger 114, the heater 130, the floor heating device 140, the circulation pump 144 and the hot water heating heat exchanger 114 are connected by a liquid pipe 143. A thermostatic valve 141 is provided on the upstream side of the inlet of the floor heating device 140 in the liquid pipe 143 to regulate the time for the liquid to flow into the floor heating device 140. A bypass pipe 145 for bypassing the floor heating device 140 is connected to the liquid pipe 143. The bypass pipe 145 is provided with an adjusting valve 142 for opening and closing the bypass pipe 145.

The hot water supply circuit includes a warming tank 120 for warming water heated by heat exchange with a coolant in a hot water heating heat exchanger 114 and a warming tank 120 for cooling water from the lower part of the warming tank 120 through a hot water heating heat exchanger 114. [ A heater 130 for further heating the water heated by the heat exchange with the refrigerant in the hot water heating heat exchanger 114 and a hot water heat exchanger 114 .

The warming tank 120, the circulating pump 121, and the hot water heating heat exchanger 114 are connected by a water pipe 123. A drain valve 122 is provided in the water pipe 123 at a position below the storage tank 120. A water supply pipe 125 is connected to the lower portion of the storage tank 120. The water supply pipe (125) is provided with a pressure reducing valve (124).

The upper portion of the holding tank 120 and the heater 130 are connected by a hot water pipe 132. And an escape valve 131 is provided at a position above the storage tank 120 in the hot water supply pipe 132.

In the hot water heating heat exchanger 114, the liquid pipe 143 and the water pipe 123 are indirectly in contact with each other via the refrigerant pipe 117 so that the refrigerant pipe 117 is interposed therebetween. Specifically, the liquid pipe 143 and the water pipe 123 are disposed above and below the refrigerant pipe 117 or on the right and left sides thereof.

The refrigerant piping 117 and the liquid piping 143, the liquid piping 143 and the water piping 123, the water piping 123 and the refrigerant piping 117 are connected to each other by brazing and are thermally coupled by brazing. As the brazing filler metal, silver solder, copper alloy, brass lead, or indium lead can be used. In addition, the present invention is not limited to brazing, and the above-described pipes may be thermally bonded using, for example, welding, brazing, or an adhesive having high thermal conductivity.

Hereinafter, the operation of the heat pump type hot water heater 100 during the hot water supply operation will be described. In the heat pump cycle 110 during the hot water supply operation, the refrigerant circulates in turn through the compressor 113, the hot water heating heat exchanger 114, the expansion valve 116, and the outdoor heat exchanger 111.

In the hot water supply circuit during the hot water supply operation, water circulates through the lower portion of the storage tank 120, the circulation pump 121, the heat exchanger 114 for heating hot water, and the upper portion of the storage tank 120 in order. As described above, the relatively low-temperature water located in the lower portion of the storage tank 120 is heated and returned to the upper portion of the storage tank 120 to maintain the temperature of the water in the storage tank 120 at or above the predetermined temperature .

Further, water, which is low in the storage tank 120, is supplied from the upper portion of the storage tank 120 via the heater 130. At this time, when the temperature of the water reaching the heater 130 is lower than the predetermined hot water temperature, the heater 130 heats the water. When the temperature of the water reaching the heater 130 is equal to or higher than the predetermined hot water temperature, the heater 130 does not operate and does not heat the water.

Next, the operation of the heat pump type hot water heater 100 during the heating operation will be described. In the heat pump cycle 110 during the heating operation, the refrigerant circulates through the compressor 113, the hot water heating heat exchanger 114, the expansion valve 116, and the outdoor heat exchanger 111 in this order.

In the heating circuit during the heating operation, the liquid circulates through the hot water heating heat exchanger 114, the heater 130, the floor heating device 140, and the circulation pump 144 in order.

At this time, when the liquid has more heat than the amount of heat required for the floor heating, the output of the floor heating device 140 is adjusted by adjusting the opening and closing time of the heat valve 141. The thermal valve 141 is provided for each load of the floor heating, and adjusts the output of the floor heating device 140.

When the heat pump cycle 110 enters the hybrid defrosting mode as described later, the control valve 142 is opened to supply the heat amount of the liquid in the heating circuit to the heat pump cycle 110 side. Accordingly, opening and closing of the thermo-valve 141 and the regulating valve 142 are controlled in accordance with the distribution of the amount of heat of the liquid.

It is preferable that the thermo valve 141 and the regulating valve 142 are not only the two phases of the open state and the closed state but also the valve whose flow rate can be adjusted more finely. In this case, when the thermal valve 141 operates in the opening direction, the control valve 142 is operated in the closing direction to increase the flow rate of the liquid flowing into the floor heating device 140, and the thermal valve 141 is closed It is possible to reduce the flow rate of the liquid flowing into the floor heating device 140 by operating the adjustment valve 142 in the opening direction. With this configuration, temperature control of the floor heating device 140 can be performed with high accuracy.

When the liquid has more heat than the amount of heat required for the floor heating, the heater 130 does not operate and does not heat the liquid. On the other hand, when the liquid has a smaller amount of heat than the amount of heat required for the floor heating, the liquid is heated by the heater 130. That is, the heater 130 is operated by an output corresponding to the output of the floor heating device 140. [

Next, the operation of the heat pump type hot water heater 100 during the defrosting operation will be described. In the heat pump cycle 110 during the defrosting operation, the refrigerant circulates in turn through the compressor 113, the hot water heating heat exchanger 114, the electromagnetic valve 115, the expansion valve 116, and the outdoor heat exchanger 111 .

The refrigerant passes mainly through the electromagnetic valve 115, so that the refrigerant of high temperature flows to the outdoor heat exchanger 111 as compared with the case where the refrigerant passes through the expansion valve 116 only. The defrosting of the outdoor heat exchanger 111 is carried out by the refrigerant having a relatively high temperature. The operation of defrosting the outdoor heat exchanger 111 only by circulating the refrigerant in the heat pump cycle 110 is generally referred to as defrost.

As described above, the defrosting capability depends on the amount of heat that the refrigerant circulating in the heat pump cycle 110 has. The amount of heat obtained by the refrigerant in the outdoor heat exchanger 111 depends on the outside air temperature.

For example, when the outside air temperature of 2 ° C or lower is low, the defrosting ability of the defrosting generally decreases due to the decrease in the amount of heat of the refrigerant, and the defrosting of the outdoor heat exchanger 111 can not be sufficiently carried out under normal conditions. In such a case, the heat pump type hot water heater 100 circulates the liquid in the heating circuit to circulate the refrigerant to the outdoor heat exchanger 111 while supplementing the heat amount of the refrigerant by the hot water heating heat exchanger 114, do. The operation of performing the defrosting using both the circulation of the liquid in the heating circuit and the circulation of the refrigerant in the heat pump cycle 110 is referred to as hybrid defrosting.

In the heating circuit during the hybrid defrosting operation, the liquid circulates through the heat exchanger 114 for heating the hot water, the heater 130, and the circulation pump 144 in order. The liquid is heated by the heater 130 and flows into the hot water heating heat exchanger 114 at a high temperature.

When at least one of the hot water supply operation and the heating operation is performed during the hybrid defrost operation, the heater 130 heats the liquid to a higher temperature in order to supply the heat quantity necessary for the defrost operation, the hot water supply operation and the heating operation.

For example, when the heating operation and the hybrid defrosting operation are performed at the same time, the openings of the thermo valve 141 and the regulating valve 142 are adjusted to distribute the liquid. The liquid is heated by the heater 130 so that the liquid flowing through each of the thermal valve 141 and the regulating valve 142 has a required heat quantity.

Further, when the heat pump type hot water heater 100 includes a plurality of floor heating devices 140, a thermal valve 141 is installed in each floor heating device 140. In this case, the degrees of opening of each of the plurality of thermo-valves 141 and 142 provided in the floor heating device 140 in operation are adjusted to distribute the liquid, and the plurality of thermo- The liquid is heated by the heater 130 so that the liquid passing through each of the heaters 142, 142 has a required heat quantity.

In the heat exchanger (114) for hot water heating, the refrigerant is heated by heat exchange between the liquid and the refrigerant. The defrosting of the outdoor heat exchanger 111 can be reliably performed by passing the refrigerant whose heat amount is supplemented through the electromagnetic valve 115 to the outdoor heat exchanger 111. [

That is, when the heat pump type hot water heater 100 can defrost the outdoor heat exchanger 111 by the amount of heat of the refrigerant at the time of defrosting the outdoor heat exchanger 111 in the heat pump cycle 110, the refrigerant is supplied to the outdoor heat exchanger 111 When the refrigerant can not be defrosted by the heat of the refrigerant, the refrigerant is passed through the outdoor heat exchanger (111) while the liquid is heated by the heater (130) to supplement the heat amount of the refrigerant with the hot water heating heat exchanger, do.

In this way, even when the outdoor temperature is low and the defrosting of the outdoor heat exchanger 111 can not be performed normally enough for the defrosting operation, the defrosting of the outdoor heat exchanger 111 can be reliably performed by the hybrid defrosting. As a result, the operation of the heat pump type hot water heater 100 can be stably continued.

Hereinafter, the flow of determining whether to perform normal defrosting or hybrid defrosting in the heat pump type hot water heater 100 will be described.

Fig. 2 is a flow chart showing the flow up to the start of normal defrosting or hybrid defrosting in the heat pump type hot water heater according to the present embodiment.

The heat pump type hot water heater 100 according to the present embodiment further includes a temperature measuring device (not shown) for measuring at least one of the outside temperature and the temperature of the outdoor heat exchanger 111. The heat pump type hot water heater 100 is provided with a control unit (not shown) for receiving the signal of the measurement result from the temperature measuring device and controlling each configuration of the heat pump type hot water heater 100.

When at least one of the hot water supply operation and the heating operation is performed in the heat pump type hot water heater 100 and the operation of the heat pump cycle 110 is continued, the temperature of the outdoor heat exchanger 111 is gradually lowered.

Accordingly, in order to prepare for defrosting when at least one of the outside temperature measured by the temperature measuring device and the temperature of the outdoor heat exchanger 111 reaches a predetermined temperature range, the control unit controls the heat pump type hot water heater (100). The predetermined temperature range is referred to as a defrosting preparation station. Specifically, at the stage of entering the defrosting preparation station, the control unit activates the heater 130 to prepare a predetermined amount of heated liquid.

In this embodiment, when the temperature in the outdoor heat exchanger 111 is higher than -2 DEG C and lower than 0 DEG C as the defrost preparation station and the temperature in the outdoor heat exchanger 111 is lower than -2 DEG C The defrosting is started. However, the above-described defrosting preparation stage and defrosting start conditions are merely examples and can be set to various factors.

As shown in Fig. 2, when the operation of the heat pump type hot water heater 100 is started (S100), the control unit confirms whether or not the hot water heating operation of the heat pump type hot water heater 100 is performed (S110).

When the hot water supply operation is performed in the heat pump type hot water heater 100 and the temperature in the outdoor heat exchanger 111 is -2 DEG C or lower, the control unit determines that the outdoor temperature received from the temperature measuring instrument is 2 (S120). If the outside temperature is 2 DEG C or less, the control unit judges that defrosting can not be sufficiently carried out with the usual defrosting, and starts the hybrid defrosting (S130). Specifically, the control unit starts the circulation of the liquid in the heating circuit by operating the circulation pump 144, and circulates the refrigerant in the heat pump cycle 110 with the solenoid valve 115 fully opened .

On the other hand, when the outside temperature is higher than 2 占 폚, the control unit normally judges that defrosting can be sufficiently performed by defrosting, and starts defrosting normally (S140). Specifically, the control unit circulates the refrigerant in the heat pump cycle 110 by opening the solenoid valve 115.

If the hot-water supply hot water heater 100 does not have hot water supply operation, the control unit checks whether the heating operation is performed in the heat pump hot water heater 100 (S111).

When the heating operation is performed in the heat pump type hot water heater 100 and the temperature in the outdoor heat exchanger 111 is -2 DEG C or lower, the control unit proceeds to the step of checking the outdoor temperature (S120). In the case where the heating operation is not performed in the heat pump type hot water heater 100, the control unit returns to the hot water operation operation confirmation step (S110).

As described above, whether or not the defrosting can be performed by the amount of heat of the refrigerant at the time of defrosting in the heat pump cycle 110 is determined based on the measurement result by the temperature measuring device and the defrosting or hybrid defrosting is usually started, And the hybrid defrosting can be properly selected to perform defrosting.

Usually, the defrosting and hybrid defrosting is terminated at a stage where the control unit confirms that the defrosting unit has entered the defrosting station again. Specifically, the control unit turns the solenoid valve 115 fully closed to bring the heat pump cycle 110 into a normal operation state.

In the ending operation of the hybrid defrosting, the control unit may stop the circulation pump 144 at the same time as closing the electromagnetic valve 115. Alternatively, even if the electromagnetic valve 115 is closed after the circulation pump 144 is stopped first good.

During the hybrid defrosting, it is preferable that the circulation of water in the hot water supply circuit is stopped. By doing so, a large amount of heat of the liquid circulating in the heating circuit can be supplemented to the refrigerant, so that the defrosting of the outdoor heat exchanger 111 can be performed efficiently.

Hereinafter, a heat pump type hot water heater according to a second embodiment of the present invention will be described. The heat pump type hot water heater according to the present embodiment differs from the heat pump type hot water heater 100 according to the first embodiment only in the selection method of defrosting and hybrid defrosting. .

(Embodiment 2)

Fig. 3 is a flow chart showing the flow up to the start of normal defrosting or hybrid defrosting in the heat pump type hot water heater according to the second embodiment of the present invention.

As shown in Fig. 3, when the operation of the heat pump type hot water heater according to the present embodiment is started (S100), the control unit confirms whether hot water supply operation is performed in the heat pump type hot water heater (Sl10).

When the hot-water supply operation is performed in the heat pump type hot water heater and the temperature of the outdoor heat exchanger 111 is -2 DEG C or less, the control unit confirms whether the cumulative number of times of normal defrosting during operation is three times or more S220). When the cumulative number of normal defrosting operations is three or more, the control unit judges that defrosting can not be sufficiently performed with the normal defrosting operation, and starts the hybrid defrosting operation (S130). Specifically, the control unit starts the circulation of the liquid in the heating circuit by operating the circulation pump 144, and circulates the refrigerant in the heat pump cycle 110 by opening the solenoid valve 115.

On the other hand, when the cumulative number of normal defrosting operations is less than three, the control unit normally judges that defrosting can be sufficiently performed by defrosting, and normally starts defrosting (S140). Specifically, the control unit circulates the refrigerant in the heat pump cycle 110 by opening the solenoid valve 115.

If the hot-water supply operation is not performed in the heat pump type hot water heater, the control unit confirms whether the heating operation is performed in the heat pump type hot water heater (S111).

When the heating operation is performed in the heat pump type hot water heater and the temperature in the outdoor heat exchanger 111 is -2 DEG C or lower, the control unit proceeds to the step of checking the defrosting frequency (S220). If the heating operation is not performed in the heat pump type hot water heater, the control unit returns to the hot water operation operation confirmation step (S110).

As described above, whether or not the defrosting by the amount of heat of the refrigerant at the time of defrosting in the heat pump cycle 110 is determined based on the cumulative number of times of normal defrosting during operation and the defrosting or hybrid defrosting is usually started, It is possible to perform defrosting by appropriately selecting any one of defrosting and hybrid defrosting.

By selecting the defrosting mode and the hybrid defrosting mode in the above-described manner, it is possible to suppress the repetition of defrosting frequently and to continue the normal operation of the heat-pump type hot-water supply heater stably.

Hereinafter, a heat pump type hot water heater according to Embodiment 3 of the present invention will be described. The heat pump type hot water heater according to the present embodiment differs from the heat pump type hot water heater 100 according to the first embodiment only in the selection method of defrosting and hybrid defrosting. .

(Embodiment 3)

Fig. 4 is a flow chart showing the flow up to the start of normal defrosting or hybrid defrosting in the heat pump type hot water heater according to the third embodiment of the present invention.

As shown in Fig. 4, when the operation of the heat pump type hot water heater according to the present embodiment is started (S100), the control unit confirms whether or not the hot water heating operation is performed in the heat pump type hot water heater (S110).

When the hot water supply operation is performed in the heat pump type hot water heater and the temperature of the outdoor heat exchanger 111 is -2 DEG C or less, the control unit judges whether or not the measurement result of the outdoor temperature received from the temperature meter is 2 DEG C or less , Or whether the cumulative number of normal defrosting operations is three or more (S320).

If the result of the measurement of the outdoor temperature received from the temperature measuring device is 2 DEG C or less, or the cumulative number of times of normal defrosting during operation is three or more, the control section judges that defrosting can not be sufficiently carried out with normal defrosting and starts hybrid defrosting ). Specifically, the control unit starts the circulation of the liquid in the heating circuit by operating the circulation pump 144, and circulates the refrigerant in the heat pump cycle 110 by opening the solenoid valve 115.

On the other hand, when the measurement result of the outdoor temperature received from the temperature measuring device is higher than 2 占 폚 or the cumulative frequency of the normal defrosting during operation is less than 3, the control unit judges that defrosting is normally sufficient for defrosting, (S140). Specifically, the control unit circulates the refrigerant in the heat pump cycle 110 by opening the solenoid valve 115.

If the hot-water supply operation is not performed in the heat pump type hot water heater, the control unit checks whether the heating operation is performed in the heat pump type hot water heater (S111).

When the heating operation is performed in the heat pump type hot water heater and the temperature in the outdoor heat exchanger 111 is -2 DEG C or lower, the control unit confirms the outdoor temperature or the normal defrosting number confirmation step (S320) Lt; / RTI > If the heating operation is not performed in the heat pump type hot water heater, the control unit returns to the hot water operation operation confirmation step (S110).

As described above, whether or not the defrosting can be performed by the amount of heat of the refrigerant at the time of defrosting in the heat pump cycle 110 is determined based on the measurement result by the temperature measuring device and the cumulative number of defrosting during operation, Defrosting can be performed by appropriately selecting any one of defrosting and hybrid defrosting.

By selecting the normal defrosting and the hybrid defrosting in the above-described manner, it is possible to defrost the outdoor heat exchanger 111 reliably while suppressing frequent repetition of defrosting, so that the normal operation of the heat pump type hot water heater can be stably It becomes possible to continue.

The presently disclosed embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced.

100 - Heat pump type hot water heater 110 - Heat pump cycle
111 - outdoor heat exchanger 112 - fan
113 - compressor 114 - heat exchanger for hot water heating
115 - Solenoid valve 116 - Expansion valve
117 - Refrigerant piping 118,145 - Bypass piping
120 - Storage tank 121,144 - Circulation pump
122 - Drain valve 123 - Water piping
124 - Pressure reducing valve 125 - Water supply piping
130 - Heater 131 - Escape valve
132 - Hot water piping 140 - Floor heating
141 - Thermal valve 142 - Adjustment valve
143 - Liquid piping

Claims (4)

A heat pump cycle including an outdoor heat exchanger circulating the refrigerant only in the same direction to exchange heat between the ambient air and the refrigerant,
A heating circuit for circulating the liquid to the heating device,
A hot water supply circuit for warming or warming the heated water,
A heat exchanger for hot water heating for exchanging heat between the refrigerant and the liquid and the water,
And a heater knitted in the heating circuit and the hot water supply circuit for heating the liquid and the water,
In the hot water heating heat exchanger, a liquid pipe through which the liquid flows and a water pipe through which the water flows indirectly come in contact with the coolant pipe through the coolant pipe,
When defrosting the outdoor heat exchanger by the amount of heat of the refrigerant at the time of defrosting the outdoor heat exchanger in the heat pump cycle without circulating the liquid in the heating circuit for defrosting, The outdoor heat exchanger is normally defrosted only by circulation of the refrigerant, and when the amount of heat of the refrigerant can not be defrosted, the liquid is heated by the heater while circulating the liquid in the heating circuit, and at the same time, And the refrigerant is circulated to the outdoor heat exchanger while supplementing the heat quantity of the refrigerant to the hot water heating heat exchanger, thereby performing hybrid defrosting.
The method according to claim 1,
Further comprising a temperature measuring device for measuring at least one of an outdoor temperature and a temperature of the outdoor heat exchanger,
And determines whether or not the refrigerant can be defrosted by the amount of the refrigerant at the time of defrosting in the heat pump cycle based on the measurement result by the temperature measuring device.
The method according to claim 1,
And determines whether or not the defrosting by the amount of heat of the refrigerant at the time of defrosting in the heat pump cycle is based on the cumulative number of times of the normal defrosting during operation.
The method according to claim 1,
Further comprising a temperature measuring device for measuring at least one of an outdoor temperature and a temperature of the outdoor heat exchanger,
And determines whether or not the defrosting can be performed by the amount of heat of the refrigerant at the time of defrosting in the heat pump cycle based on the measurement result by the temperature measuring device and the cumulative number of times of the normal defrosting during operation.

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