JP5693498B2 - Heat pump hot water heater - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a heat pump type hot water heater and, more particularly, to a heat pump type hot water heater that can be used in cold regions.

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

  Japanese Unexamined Patent Application Publication No. 2009-243747 (Patent Document 2) is a prior art document that discloses a heat pump hot water heater that can transfer heat of refrigerant to water flowing through a hot water supply pipe and water flowing through a heating pipe.

  In the heat pump 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, each of the refrigerant pipe and the floor heating pipe, the floor heating pipe and the hot water supply pipe, and the hot water supply pipe and the refrigerant pipe are thermally coupled.

JP 2003-90653 A JP 2009-243747 A

  In heat pump type water heaters, in order to prevent water from freezing in the hot water supply pipes, a reverse cycle (cooling operation) in which the flow direction of the refrigerant is opposite to that in the heating operation like an air conditioner. Cannot be defrosted.

  Therefore, the defrosting capacity 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, the outdoor heat exchanger cannot be sufficiently defrosted. As a result, problems such as unstable heat exchange performance in the outdoor heat exchanger or poor drainage due to refreezing of the drain have occurred. In addition, in order to avoid these phenomena, the defrosting operation is frequently performed, which hinders the normal operation.

  This invention is made | formed in view of said problem, Comprising: It aims at providing the heat pump type hot-water supply heater which can defrost an outdoor heat exchanger reliably.

  A heat pump hot water heater according to the present invention includes a heat pump cycle including an outdoor heat exchanger that circulates a refrigerant to exchange heat between outside air and the refrigerant, a heating circuit for circulating liquid to the heating device, A hot water supply circuit for storing or supplying hot water, a heat exchanger for hot water heating and heating to exchange heat between the refrigerant, the liquid and the water, a heating circuit and a hot water supply circuit, and the liquid and A heater for heating the water. In the heat exchanger for hot water supply and heating, the liquid pipe through which the liquid flows and the water pipe through which the water flows are indirectly connected via the refrigerant pipe so as to sandwich the refrigerant pipe through which the refrigerant flows. Touching. When defrosting an outdoor heat exchanger in a heat pump cycle, if it can be defrosted by the amount of heat of the refrigerant, the refrigerant is passed through the outdoor heat exchanger to normally defrost, and the amount of heat of the refrigerant cannot be defrosted Performs the hybrid defrosting by heating the liquid with a heater and allowing the refrigerant to flow through the outdoor heat exchanger while replenishing the amount of heat of the refrigerant with a hot water heater / heat exchanger.

  In one aspect of the present invention, the heat pump hot water supply / room heater further includes a temperature measuring device that measures at least one of the outside air temperature and the temperature in the outdoor heat exchanger. Whether or not defrosting can be performed with the amount of heat of the refrigerant when defrosting in the heat pump cycle is determined based on the measurement result of the temperature measuring device.

  In one form of this invention, when defrosting in a heat pump cycle, whether it can defrost with the calorie | heat amount of the said refrigerant | coolant is determined based on the frequency | count of normal defrosting during driving | operation.

  In one aspect of the present invention, the heat pump hot water supply / room heater further includes a temperature measuring device that measures at least one of the outside air temperature and the temperature in the outdoor heat exchanger. Whether or not defrosting can be performed with the amount of heat of the refrigerant when performing defrosting in the heat pump cycle is determined based on the measurement result of the temperature measuring device and the cumulative number of times of normal defrosting during operation.

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

It is a systematic diagram which shows the structure of the heat pump type hot water supply heater based on Embodiment 1 of this invention. It is a flowchart which shows the flow until the start of normal defrost or hybrid defrost in the heat pump type hot water heater according to the embodiment. It is a flowchart which shows the flow until the start of normal defrost or hybrid defrost in the heat pump type hot water heater according to Embodiment 2 of the present invention. It is a flowchart which shows the flow until the start of normal defrost or a hybrid defrost in the heat pump type hot-water supply heater based on Embodiment 3 of this invention.

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

(Embodiment 1)
FIG. 1 is a system diagram showing a configuration of a heat pump hot water heater according to Embodiment 1 of the present invention. As shown in FIG. 1, a heat pump hot water heater 100 according to Embodiment 1 of the present invention includes a heat pump cycle 110 that circulates a refrigerant, a heating circuit that circulates liquid to a heating device, and heated water. A hot water supply circuit for storing or supplying hot water.

As the refrigerant circulating in 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 liquid can be used.

  The heat pump cycle 110 includes a compressor 113 that compresses the refrigerant, a heat exchanger 114 for hot water and heating that heats the liquid and water by exchanging heat between the refrigerant flowing out of the compressor 113, the liquid and water, and hot water heating and heating. An expansion valve 116 that expands the refrigerant that has flowed out of the heat exchanger 114, and an outdoor heat exchanger 111 that heats the refrigerant by exchanging heat between the refrigerant that has expanded through the expansion valve 116 and the outside air. Yes.

  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. The refrigerant pipe 117 is connected to a bypass pipe 118 for allowing the refrigerant to bypass the expansion valve 116. The bypass pipe 118 is provided with an electromagnetic valve 115 that opens and closes the bypass pipe 118.

  The outdoor heat exchanger 111 is disposed so as to face a fan 112 for sending outside air to the outdoor heat exchanger 111.

  The heating circuit includes a heater 130 that further heats the liquid heated by heat exchange with the refrigerant in the hot water heater / heat exchanger 114, and a floor heating device that heats the floor by allowing the heated liquid to flow under the floor. 140, a circulation pump 144 that circulates liquid between the hot water supply / heating heat exchanger 114 and the floor heating device 140, and a hot water supply / heating heat exchanger 114.

  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. Moreover, although the floor heating apparatus 140 is used as a heating apparatus, the heating apparatus is not limited to this, and may be a heating apparatus that heats a window or a wall, for example. Furthermore, the heating device may be an air conditioner that uses liquid instead of the refrigerant.

  The hot water supply / heating heat exchanger 114, the heater 130, the floor heating device 140, the circulation pump 144, and the hot water supply / heating heat exchanger 114 are connected by a liquid pipe 143. In the liquid pipe 143, a thermal valve 141 that adjusts the flow time of the liquid into the floor heating device 140 is provided upstream of the entrance of the floor heating device 140. The liquid pipe 143 is connected to a bypass pipe 145 for allowing the liquid to bypass the floor heating device 140. The bypass pipe 145 is provided with an adjustment valve 142 that opens and closes the bypass pipe 145.

  The hot water supply circuit includes a hot water storage tank 120 that stores water heated by heat exchange with the refrigerant in the hot water supply / heating heat exchanger 114, and an upper portion of the hot water storage tank 120 through a hot water supply / heating heat exchanger 114 from a lower portion of the hot water storage tank 120. A circulation pump 121 for circulating water, a heater 130 for further heating water heated by heat exchange with the refrigerant in the hot water supply / heat exchanger 114, and a hot water supply / heat exchanger 114 are provided.

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

  The upper part of the hot water storage tank 120 and the heater 130 are connected by a hot water supply pipe 132. A relief valve 131 is provided at a position above the hot water storage tank 120 in the hot water supply pipe 132.

  In the hot water supply / heating heat exchanger 114, the liquid pipe 143 and the water pipe 123 are indirectly in contact with each other through the refrigerant pipe 117 so as to sandwich the refrigerant pipe 117 therebetween. Specifically, a liquid pipe 143 and a water pipe 123 are arranged above and below or right and left of the refrigerant pipe 117.

  In the hot water supply / heating heat exchanger 114, the refrigerant pipe 117 and the liquid pipe 143, the liquid pipe 143 and the water pipe 123, and the water pipe 123 and the refrigerant pipe 117 are thermally coupled by brazing. As the brazing material, silver brazing, copper brazing, brass brazing, phosphor copper brazing, or the like can be used. Moreover, it is not restricted to brazing, For example, you may thermally couple said piping using welding, soldering, or the adhesive agent with high heat conductivity.

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

  In the hot water supply circuit during the hot water supply operation, water circulates in this order in the lower part of the hot water storage tank 120, the circulation pump 121, the hot water heater / heat exchanger 114, and the upper part of the hot water storage tank 120. In this way, the temperature of the water in the hot water storage tank 120 is maintained at a predetermined temperature or higher by heating the relatively low temperature water located in the lower part of the hot water storage tank 120 and returning it to the upper part of the hot water storage tank 120. Can do.

  Further, hot water stored in the hot water storage tank 120 is supplied from the upper part of the hot water storage tank 120 via the heater 130. At this time, when the temperature of the water reaching the heater 130 is lower than a predetermined hot water supply temperature, the water is heated by the heater 130. When the temperature of the water reaching the heater 130 is equal to or higher than a predetermined hot water supply temperature, the heater 130 does not operate and does not heat the water.

  Next, an operation during the heating operation of the heat pump hot water supply / room heater 100 will be described. In the heat pump cycle 110 during the heating operation, the refrigerant circulates through the compressor 113, the hot water supply / 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 supply / heat exchanger 114, the heater 130, the floor heating device 140, and the circulation pump 144 in this order.

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

  As will be described later, when the heat pump cycle 110 enters hybrid defrosting, the regulating valve 142 is opened to supply the heat amount of the liquid in the heating circuit to the heat pump cycle 110 side. Accordingly, the opening and closing of the thermal valve 141 and the regulating valve 142 are adjusted according to the distribution of the heat quantity of the liquid.

  The thermal valve 141 and the regulating valve 142 are preferably valves that can adjust the flow rate more finely, in addition to the two stages of the open state and the closed state. In this case, the flow rate of the liquid flowing to the floor heating device 140 is increased by operating the regulating valve 142 in the closing direction when the thermal valve 141 operates in the opening direction, and the regulating valve 142 is operated in the closing direction. By operating in the opening direction, the flow rate of the liquid flowing to the floor heating device 140 can be reduced. With this configuration, the temperature control of the floor heating device 140 can be performed with high accuracy.

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

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

  Since the refrigerant mainly passes through the electromagnetic valve 115, the refrigerant having a higher temperature flows through the outdoor heat exchanger 111 than when the refrigerant passes only through the expansion valve 116. The outdoor heat exchanger 111 is defrosted by the relatively high-temperature refrigerant. The operation of defrosting the outdoor heat exchanger 111 only by circulating the refrigerant in the heat pump cycle 110 is referred to as normal defrosting.

  As described above, the defrosting capacity depends on the amount of heat that the refrigerant circulating in the heat pump cycle 110 has. The amount of heat that the refrigerant obtains 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 amount of heat of the refrigerant is reduced, so that the defrosting ability in the normal defrosting is lowered, and the outdoor heat exchanger 111 cannot be sufficiently defrosted by the normal defrosting. In such a case, the heat pump type hot water heater / heater 100 circulates the liquid in the heating circuit and replenishes the heat amount of the refrigerant by the hot water heater / heat exchanger 114, and passes the refrigerant through the outdoor heat exchanger 111 for removal. Frost. The operation of performing defrosting using both the circulation of liquid in the heating circuit and the circulation of 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 hot water supply / heating heat exchanger 114, the heater 130, and the circulation pump 144 in this order. The liquid is heated by the heater 130 and flows into the hot water supply / heating heat exchanger 114 in a high temperature state.

  In addition, when at least one of the hot water supply operation and the heating operation is performed during the hybrid defrost operation, the liquid is further added by the heater 130 to supply the amount of heat necessary for the defrost operation, the hot water supply operation, and the heating operation. Heated to high temperature.

  For example, when the heating operation and the hybrid defrosting operation are performed simultaneously, the opening degree of each of the thermal valve 141 and the regulating valve 142 is 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 the required amount of heat.

  In addition, when the heat pump hot water supply / room heater 100 includes a plurality of floor heating devices 140, each floor heating device 140 is provided with a thermal valve 141. In this case, the degree of opening of each of the plurality of thermal valves 141 and the regulating valves 142 provided in the floor heating apparatus 140 in operation is adjusted to distribute the liquid, and each of the plurality of thermal valves 141 and the regulating valves 142 The liquid is heated by the heater 130 such that the liquid flowing therethrough has the required amount of heat.

  The refrigerant and the refrigerant are heated by heat exchange between the liquid and the refrigerant in the hot water supply / heating heat exchanger 114. The refrigerant that has been heated and replenished with heat passes through the electromagnetic valve 115 and flows to the outdoor heat exchanger 111, so that the outdoor heat exchanger 111 can be defrosted with certainty.

  That is, when the outdoor heat exchanger 111 is defrosted in the heat pump cycle 110, the heat pump hot water supply / room heater 100 normally defrosts the refrigerant by passing the refrigerant through the outdoor heat exchanger 111 when the amount of heat of the refrigerant can be defrosted. If the amount of heat of the refrigerant cannot be defrosted, the hybrid is defrosted by heating the liquid with the heater 130 and replenishing the amount of heat of the refrigerant with the heat exchanger for hot water supply and heating while allowing the refrigerant to flow through the outdoor heat exchanger 111. To do.

  Thus, even when the outdoor air temperature is low and the normal defrosting cannot sufficiently defrost the outdoor heat exchanger 111, the outdoor heat exchanger 111 can be reliably defrosted by the hybrid defrosting. As a result, the operation of the heat pump hot water supply / room heater 100 can be stably continued.

  Hereinafter, in the heat pump hot water supply / room heater 100, a flow for determining which of normal defrosting and hybrid defrosting will be described.

  FIG. 2 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 present embodiment.

  In addition, the heat pump type hot water heater 100 according to the present embodiment further includes a temperature measuring device (not shown) that measures at least one of the outside air temperature and the temperature in the outdoor heat exchanger 111. The heat pump hot water supply / room heater 100 includes a control unit (not shown) that receives a measurement result signal from the temperature measuring device and controls each component of the heat pump hot water supply / room heating device 100.

  In the heat pump hot water supply / room heater 100, when at least one of the hot water supply operation and the heating operation is performed and the operation of the heat pump cycle 110 is continued, the temperature in the outdoor heat exchanger 111 gradually decreases.

  In view of this, the control unit uses a heat pump hot water heater to prepare for defrosting when at least one of the outside air temperature measured by the temperature measuring device and the temperature in the outdoor heat exchanger 111 reaches a predetermined temperature range. Activate each of the 100 configurations. Said predetermined temperature range is called a defrost preparation range. Specifically, when entering the defrost preparation area, the control unit operates the heater 130 to prepare a predetermined amount of heated liquid.

  In this embodiment, the range in which the temperature in the outdoor heat exchanger 111 is higher than −2 ° C. and lower than 0 ° C. is set as a defrost preparation region, and defrosting is started when the temperature in the outdoor heat exchanger 111 becomes −2 ° C. or lower. Is set to However, the above-mentioned defrost preparation area and defrost start conditions are examples, and can be set by various factors.

  As shown in FIG. 2, when the operation of the heat pump hot water supply / room heater 100 is started (S100), the control unit confirms whether the heat pump hot water supply / room heating device 100 is performing a hot water supply operation (S110).

  When the hot water supply operation is performed in the heat pump hot water supply / room heater 100 and the temperature in the outdoor heat exchanger 111 is −2 ° C. or less, the control unit obtains the measurement result of the outside air temperature received from the temperature measuring device is 2 ° C. or less. (S120). When the outside air temperature is 2 ° C. or lower, the control unit determines that the normal defrosting cannot sufficiently defrost and starts the hybrid defrosting (S130). Specifically, the control unit activates the circulation pump 144 to start the circulation of the liquid in the heating circuit, and fully opens the electromagnetic valve 115 to circulate the refrigerant of the heat pump cycle 110.

  On the other hand, when the outside air temperature is higher than 2 ° C., the control unit determines that it can be sufficiently defrosted by normal defrosting and starts normal defrosting (S140). Specifically, the controller circulates the refrigerant of the heat pump cycle 110 with the electromagnetic valve 115 fully opened.

  If the hot water supply operation is not performed in the heat pump hot water supply / room heater 100, the control unit confirms whether the heating operation is performed in the heat pump hot water supply / room heating device 100 (S111).

  When the heating operation is performed in heat pump hot water supply / room heater 100 and the temperature in outdoor heat exchanger 111 is −2 ° C. or lower, the control unit proceeds to an outside air temperature confirmation step (S120). When the heating operation is not performed in the heat pump hot water supply / room heater 100, the control unit returns to the operation confirmation step (S110) of the hot water supply operation.

  As described above, when defrosting in the heat pump cycle 110, it is determined whether or not defrosting can be performed with the amount of heat of the refrigerant based on the measurement result by the temperature measuring device, and normal defrosting or hybrid defrosting is started, Either normal defrosting or hybrid defrosting can be suitably selected for defrosting.

  The normal defrosting and the hybrid defrosting are finished when the control unit confirms that the defrost preparation area is entered again. Specifically, the control unit fully closes the electromagnetic valve 115 and puts the heat pump cycle 110 into a normal operation state.

  In the end operation of hybrid defrosting, the control unit may stop the circulation pump 144 at the same time as closing the solenoid valve 115, or close the solenoid valve 115 after stopping the circulation pump 144 first. Also good.

  During hybrid defrosting, the circulation of water in the hot water supply circuit is preferably stopped. By doing so, the refrigerant can be replenished with a large amount of heat of the liquid circulating in the heating circuit, so that the outdoor heat exchanger 111 can be defrosted efficiently.

  Hereinafter, the heat pump type hot-water heater according to Embodiment 2 of the present invention will be described. In addition, since the heat pump hot water heater / heater according to the present embodiment is different from the heat pump hot water heater / heater 100 according to the first embodiment only in the selection method of the normal defrosting and the hybrid defrosting, the description of the other configurations is repeated. Absent.

(Embodiment 2)
FIG. 3 is a flowchart showing a flow until the start of normal defrosting or hybrid defrosting in the heat pump hot water supply / room heater according to Embodiment 2 of the present invention.

  As shown in FIG. 3, when the operation of the heat pump hot water supply / air heater according to the present embodiment is started (S100), the control unit confirms whether the hot water supply operation is performed in the heat pump hot water supply / air heater (S110). .

  When the hot water supply operation is performed in the heat pump hot water heater and the temperature in the outdoor heat exchanger 111 is −2 ° C. or lower, the control unit confirms whether the cumulative number of normal defrosts during operation is three or more. (S220). When the cumulative number of normal defrosts during operation is three or more, the control unit determines that the normal defrost cannot sufficiently defrost and starts hybrid defrost (S130). Specifically, the control unit activates the circulation pump 144 to start the circulation of the liquid in the heating circuit, and fully opens the electromagnetic valve 115 to circulate the refrigerant of the heat pump cycle 110.

  On the other hand, when the cumulative number of normal defrosts during operation is less than 3, the control unit determines that the normal defrost can sufficiently defrost and starts the normal defrost (S140). Specifically, the controller circulates the refrigerant of the heat pump cycle 110 with the electromagnetic valve 115 fully opened.

  In addition, when the hot water supply operation is not performed in the heat pump hot water supply / room heater, the control unit confirms whether the heating operation is performed in the heat pump hot water supply / air heater (S111).

  When the heating operation is performed in the heat pump hot water supply / room heater and the temperature in the outdoor heat exchanger 111 is −2 ° C. or lower, the control unit proceeds to the normal defrosting number confirmation step (S220). When the heating operation is not performed in the heat pump hot water heater, the control unit returns to the operation confirmation step (S110) of the hot water operation.

  As described above, when defrosting is performed in the heat pump cycle 110, whether or not defrosting can be performed with the amount of heat of the refrigerant is determined based on the cumulative number of normal defrosting operations, and normal defrosting or hybrid defrosting is started. Thus, it is possible to perform defrosting by suitably selecting either normal defrosting or hybrid defrosting.

  By selecting normal defrosting and hybrid defrosting by the above method, it is possible to suppress normal defrosting frequently and to continue normal operation of the heat pump hot water heater stably. Become.

  Hereinafter, the heat pump type hot water supply / room heater according to Embodiment 3 of the present invention will be described. In addition, since the heat pump hot water heater / heater according to the present embodiment is different from the heat pump hot water heater / heater 100 according to the first embodiment only in the selection method of the normal defrosting and the hybrid defrosting, the description of the other configurations is repeated. Absent.

(Embodiment 3)
FIG. 4 is a flowchart showing a flow up to the start of normal defrosting or hybrid defrosting in the heat pump hot water heater according to the third embodiment of the present invention.

  As shown in FIG. 4, when the operation of the heat pump hot water supply / air heater according to the present embodiment is started (S100), the control unit confirms whether the hot water supply operation is performed in the heat pump hot water supply / air heater (S110). .

  When the hot water supply operation is performed in the heat pump hot water heater and the temperature in the outdoor heat exchanger 111 is −2 ° C. or lower, the control unit determines whether the measurement result of the outside air temperature received from the temperature measuring device is 2 ° C. or lower. Alternatively, it is confirmed whether the cumulative number of normal defrosts during operation is 3 or more (S320).

  When the measurement result of the outside air temperature received from the temperature measuring device is 2 ° C. or less, or the cumulative number of normal defrosts during operation is 3 times or more, the control unit sufficiently defrosts the normal defrosts. Hybrid defrosting is started by determining that it cannot be performed (S130). Specifically, the control unit activates the circulation pump 144 to start the circulation of the liquid in the heating circuit, and fully opens the electromagnetic valve 115 to circulate the refrigerant of the heat pump cycle 110.

  On the other hand, when the measurement result of the outside air temperature received from the temperature measuring device is higher than 2 ° C. or the cumulative number of normal defrosts during operation is less than 3, the control unit sufficiently defrosts with normal defrosting. It is determined that the defrosting is possible and normal defrosting is started (S140). Specifically, the controller circulates the refrigerant of the heat pump cycle 110 with the electromagnetic valve 115 fully opened.

  In addition, when the hot water supply operation is not performed in the heat pump hot water supply / room heater, the control unit confirms whether the heating operation is performed in the heat pump hot water supply / air heater (S111).

  When the heating operation is performed in the heat pump hot water heater and the temperature in the outdoor heat exchanger 111 is −2 ° C. or less, the control unit performs the confirmation step of the outside air temperature or the normal defrosting number confirmation step (S320). move on. When the heating operation is not performed in the heat pump hot water heater, the control unit returns to the operation confirmation step (S110) of the hot water operation.

  As described above, when defrosting is performed in the heat pump cycle 110, whether or not defrosting can be performed by the amount of heat of the refrigerant is determined based on the measurement result by the temperature measuring instrument and the cumulative number of times of normal defrosting during operation. Alternatively, by starting hybrid defrosting, it is possible to perform defrosting by suitably selecting either normal defrosting or hybrid defrosting.

  By selecting between normal defrosting and hybrid defrosting by the above method, the outdoor heat exchanger 111 can be reliably defrosted while suppressing frequent repeated defrosting, so that the heat pump hot water heater Normal operation can be continued stably.

  It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 100 Heat pump type hot water heater / heater, 110 Heat pump cycle, 111 Outdoor heat exchanger, 112 Fan, 113 Compressor, 114 Heat exchanger for hot water heater / 115, Solenoid valve, 116 Expansion valve, 117 Refrigerant piping, 118, 145 Bypass piping, 120 Hot water storage tank, 121, 144 Circulation pump, 122 Drain valve, 123 Water piping, 124 Pressure reducing valve, 125 Water supply piping, 130 Heater, 131 Relief valve, 132 Hot water piping, 140 Floor heating device, 141 Thermal valve, 142 Adjustment Valve, 143 Liquid piping.

Claims (4)

A heat pump cycle including an outdoor heat exchanger that circulates the refrigerant only in the same direction to exchange heat between the outside air and the refrigerant;
A heating circuit for circulating liquid to the heating device;
A hot water supply circuit for storing or supplying hot water, and
A heat exchanger for hot water supply and heating to exchange heat between the refrigerant and the liquid and the water;
Incorporated in the heating circuit and the hot water supply circuit, comprising a heater for heating the liquid and the water,
In the hot water heater / heat exchanger, a liquid pipe through which the liquid flows and a water pipe through which the water flows are interposed via the refrigerant pipe so as to sandwich a refrigerant pipe through which the refrigerant flows. Indirect contact,
When defrosting the outdoor heat exchanger in the heat pump cycle, if defrosting can be performed with the amount of heat of the refrigerant, the refrigerant in the heat pump cycle is not circulated for defrosting without circulating the liquid in the heating circuit. When the outdoor heat exchanger is normally defrosted only by circulation and cannot be defrosted by the amount of heat of the refrigerant, the liquid is heated in the heating circuit while circulating the liquid in the heating circuit , and in the heat pump cycle. A heat-pump hot water heater that circulates the refrigerant to perform hybrid defrosting by allowing the refrigerant to flow through the outdoor heat exchanger while supplementing the amount of heat of the refrigerant with the hot water heater / heat exchanger. A temperature measuring device for measuring at least one of an outside air temperature and a temperature in the outdoor heat exchanger;
The heat pump hot water heater according to claim 1, wherein whether or not defrosting can be performed with the amount of heat of the refrigerant is determined based on a measurement result by the temperature measuring device when defrosting in the heat pump cycle.   The heat pump type hot water heater according to claim 1, wherein whether or not defrosting can be performed with the amount of heat of the refrigerant when defrosting in the heat pump cycle is determined based on a cumulative number of the normal defrosting during operation. A temperature measuring device for measuring at least one of an outside air temperature and a temperature in the outdoor heat exchanger;
It is determined whether it can defrost with the calorie | heat amount of the said refrigerant | coolant in the case of defrosting in the said heat pump cycle based on the measurement result by the said temperature measuring device, and the accumulation frequency of the said normal defrost in operation. Heat pump hot water heater.

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