KR20090085373A - Heat pump water heater and its control method - Google Patents

Abstract

The heat pump water heater according to the present invention comprises: a heat pump including a compressor, a condenser / evaporator, an expansion mechanism, an evaporator / condenser, and a heating / defrost switching valve; A water circulation circuit including a pump configured to circulate the water after the heat is exchanged with the condensation / evaporator and sequentially passed through a heater and a hot water supply pipe to the condensation / evaporator; Including the control unit to turn on the heater during the defrosting operation of the heat pump, since the water heated by the heater during the defrosting of the heat pump is supplied to the hot water supply pipe, the hot water supply pipe continuously maintains the heat demand such as the floor during the defrost of the heat pump. When the defrost of the heat pump, the water heated in the heater and passed through the hot water supply pipe flows into the condenser / evaporator to increase the heat exchange performance of the condenser / evaporator, so that the defrost of the evaporator / condenser is carried out quickly have.

Description

Heat pump heating apparatus and control method of the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump hot water heater having a water circulation circuit for transferring heat of a heat pump and a heat pump to a hot water supply pipe, and a control method thereof. In particular, a heat pump hot water heater for turning on a heater installed in a water circulation circuit during defrosting of a heat pump. And a control method thereof.

In general, the heat pump water heater uses the heat of a heat pump including a compressor, a condenser, an expansion mechanism, and an evaporator to heat the floor of the room, and the condenser is a water refrigerant heat exchanger that heats water while condensing the gas refrigerant at high temperature and high pressure.

In the heat pump water heater, the water refrigerant heat exchanger and the hot water supply pipe are connected to the water circulation pipe, and a pump is installed to circulate the water in the water circulation pipe.When the pump is driven, the water circulates in the hot water supply pipe and the water refrigerant heat exchanger to restore the heat of the refrigerant. It is delivered to the hot water supply pipe, and the room is heated by the heat transferred from the hot water supply pipe.

In the case of installing a heater between the water refrigerant heat exchanger and the hot water supply pipe, the heat pump water heater may be further heated by the heater after the water in the hot water supply pipe is heated in the water refrigerant heat exchanger. This installed floor or the like can be sufficiently heated even at low temperatures and can be quickly heated.

The present invention has been made to solve the above problems of the prior art, a heat pump hot water heater that can heat the hot water supply, such as a floor, the hot water pipe during the defrosting operation of the heat pump to continuously heat the floor during the defrosting of the heat pump The purpose is to provide.

Another object of the present invention is a heat pump water heater that can increase the heat exchange performance of the condensation / evaporator and minimize the evaporation / condenser defrost time of the heat pump water heater by the water heated by the heater to the condensation / evaporator during the defrost operation of the heat pump To provide a control method of.

The heat pump water heater according to the present invention for solving the above problems is a heat pump including a compressor, a condenser / evaporator, an expansion mechanism, an evaporation / condenser, and a heating / defrosting valve; A water circulation circuit including a pump configured to circulate the water after the heat is exchanged with the condensation / evaporator and sequentially passed through a heater and a hot water supply pipe to the condensation / evaporator; It includes a control unit for turning on the heater during the defrost operation of the heat pump.

The water circulation circuit is configured such that water flows in the order of condensation / evaporator, heater, pump, and hot water supply piping, and the heat pump water heater is configured to allow the water passing through the pump to bypass the hot water supply pipe and flow into the condensation / evaporator. It further includes a hot water supply pipe bypass means installed to allow.

The hot water supply pipe bypass means includes a bypass valve installed between the pump and the hot water supply pipe and controlled by the controller, and a connection pipe connecting the outlet of the hot water supply pipe and the inlet of the evaporation / hot water heat exchanger. It includes a bypass pipe connecting the pass valve.

The control unit controls the bypass valve to the hot water supply pipe supply mode during the heating operation of the heat pump, and controls the bypass valve to the condensation / evaporator supply mode during the defrosting operation of the heat pump.

Further comprising a condensation / evaporator water inlet temperature sensor for sensing the temperature of the water flowing into the condensation / evaporator, the control unit controls the bypass valve in the condensation / evaporator supply mode, and then detected by the water inlet temperature sensor If the temperature of water is more than the set value, the bypass valve is controlled in the hot water supply pipe supply mode.

A control method of a heat pump water heater according to the present invention includes a heat pump heating operation step of driving a pump according to a load of a hot water supply pipe and heating the heat pump; A heater-on defrosting step of turning on the heater between the condensation / evaporator of the heat pump and the hot water supply pipe of the water circulation circuit if the defrost condition is satisfied during the driving of the pump and the heating operation of the heat pump; And a defrost termination step of turning off the heater and heating the heat pump after the heater on defrosting step.

The defrost condition is a condition in which the heating operation integration time of the heat pump reaches the defrost start set time.

The defrost end step is performed when the defrosting completion time is reached after the heater on defrost step.

The defrosting condition is a condition in which a sensing temperature of the defrosting sensor sensing the temperature of the evaporator / condenser is less than a set value.

The defrost end step is performed if the detected temperature of the defrost sensor for detecting the temperature of the evaporator / condenser after the heater on defrost step is equal to or greater than a set value.

The heater on defrosting step controls the bypass valve between the heater and the hot water supply pipe to the condensation / evaporator supply mode, and the bypass valve has a temperature above the set value of the water introduced into the condensation / evaporator after the defrosting end step. The back surface is controlled to the hot water supply pipe supply mode.

Since the heat pump water heater according to the present invention configured as described above defrosts the evaporator / condenser of the heat pump by the defrost cycle circuit of the heat pump, there is an advantage of defrosting the evaporator / condenser of the heat pump with a simple circuit configuration.

 In the heat pump water heater according to the present invention, since the heater is turned on when the heat pump is defrosted, and the water heated by the heater is supplied to the hot water supply pipe, the hot water supply pipe continues the heat demand such as the floor even during the defrosting operation of the heat pump. There is an advantage to heating.

The heat pump water heater according to the present invention has an advantage that the water heated by the heater passes through the hot water supply pipe and then flows into the condenser / evaporator, thereby improving heat exchange performance of the condenser / evaporator and improving defrosting performance of the evaporator / condenser. .

The heat pump water heater according to the present invention, since the water heated by the heater bypasses the hot water supply pipe and flows into the condensation / evaporator without heat exchange with the hot water supply pipe, the heat exchange performance of the condensation / evaporator is maximized, and the defrosting performance of the evaporator / condenser is improved. There is an advantage to be improved.

In the control method of the heat pump water heater according to the present invention, when the defrost condition is satisfied during the heating operation of the heat pump, the defrosting operation of the heat pump is performed and the heater is turned on so that the water heated by the heater is defrosted during the defrosting operation of the heat pump. The hot water supply pipe can be heated to increase the heating performance of the heat pump hot water heater, and the water heated by the heater can increase the heat exchange performance of the condensation / evaporator, thereby reducing the defrost time of the heat pump hot water heater. have.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of an embodiment of a heat pump water heater according to the present invention, Figure 2 is a detailed configuration of the heating operation of the heat pump water heater according to an embodiment of the present invention, Figure 3 is a heat pump water heater according to the present invention 4 is a detailed configuration diagram of the defrosting operation of the embodiment, Figure 4 is a detailed configuration diagram of the water circulation circuit of the heat pump hot water heater according to an embodiment of the present invention.

 As shown in FIG. 1, the heat pump water heater according to the present embodiment includes a heat pump 2 and a water circulation circuit 4 for transferring heat generated from the heat pump 2 to a heat demand such as a floor. do.

The heat pump 2 includes a compressor 6, a condenser / evaporator 20, an expansion mechanism 30, an evaporator / condenser 40, and a heating / defrost switching valve 50.

The compressor 6 compresses a low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant, and is composed of a variable displacement compressor whose compression capacity can be varied according to a hot water load.

The compressor 6 may be constituted by an interleaver compressor whose compression capacity is variable according to the input frequency, or may be composed of a combination of a plurality of constant speed compressors having a constant compression capacity. It is demonstrated that the constant speed compressor 8 is connected in parallel.

The compressor 6 includes inlet pipes 11 and 12 through which the refrigerant flows, that is, an inlet pipe 11 through which the refrigerant flows into the inverter compressor 7 and an inlet pipe 12 through which the refrigerant flows into the constant speed compressor 8. Is connected to one accumulator 13 in which a liquid refrigerant in the refrigerant is accumulated.

The compressor 6 has outlet pipes 14 and 15 through which refrigerant flows out, that is, an outlet pipe 14 through which refrigerant flows out from the inverter compressor 7, and an outlet pipe 15 through which refrigerant flows out from the constant speed compressor 8. ) Is connected to the junction strip (16).

The condensation / evaporator 20 has a high temperature and high pressure gaseous refrigerant compressed by the compressor 6 and a low temperature low pressure refrigerant, which is expanded in the expansion mechanism 30, by exchanging water in the water circulation circuit 4 or the water circulation circuit 4. Is a heat exchanger in which water of heat is exchanged, and a condensation / evaporation flow path 22 in which a refrigerant condenses or evaporates as a refrigerant passes through is formed, and a water refrigerant formed so that a part of the water circulation circuit 4 exchanges heat with the condensation / evaporation flow path 22. It consists of a heat exchanger.

Condensation / evaporator 20 is a condensation / evaporation flow path 22 is connected to the compressor (6) side and the refrigerant pipe 23, and also connected to the expansion mechanism 30 and the refrigerant pipe (24).

The expansion mechanism 30 is a kind of variable expansion mechanism that expands or blocks the refrigerant passing between the condensation passage 22 and the evaporator / condenser 40 of the condenser / evaporator 20, and has a variable opening value to control the amount of refrigerant. It consists of an electronic expansion valve such as LEV.

The evaporator / condenser 40 is a heat exchanger in which the refrigerant expanded while passing through the expansion mechanism 30 absorbs heat and condenses the gaseous refrigerant of high temperature and high pressure compressed by the compressor 6, and expands in the expansion mechanism 30. ) Is connected to the refrigerant pipe (41), and is connected to the compressor (6) side and the refrigerant pipe (42).

The evaporator / condenser 40 may be configured as a heat exchanger in which the refrigerant is heat-exchanged with a fluid such as water, or may be configured as a heat exchanger in which the refrigerant is heat-exchanged with outdoor air.

The evaporator / condenser 40 has a complicated configuration of the evaporator / condenser 40 itself when the refrigerant exchanges heat with a fluid such as water, and requires a separate water supply device for supplying water to the evaporator / condenser 40. When the refrigerant is heat-exchanged with outdoor air, an outdoor fan for blowing outdoor air to the evaporator / condenser 40 is needed. Hereinafter, the outdoor fan 46 for blowing outdoor air to the evaporator / condenser 40 is required. It is described that the evaporation / condenser 40 is made of an air refrigerant heat exchanger.

The heating / defrost switching valve 50 is a heat pump (2) when the heating the refrigerant compressed in the compressor (6) to the condensation / evaporator 20 and the refrigerant evaporated in the evaporator / condenser 40 to the compressor (6) And to defrost, the refrigerant compressed in the compressor (6) to the evaporator / condenser 40 and the refrigerant passed through the condensation / evaporator 20 to the compressor (6), further comprises a four-way valve.

The heating / defrost switching valve 50 is connected to the accumulator 13 and the accumulator connecting pipe 51 on the inlet pipe 11, 12 side of the compressor 6, and the outlet pipe of the compressor 6 ( 14) (15) is connected to the joint 16 and the outlet pipe connecting pipe 52, the condensation / evaporator (20) of the condensation / evaporation flow path 22 and the condensation / evaporator connecting pipe to the refrigerant pipe (23) It is connected to the evaporator / condenser 40 and the refrigerant pipe 42 which is a connection pipe of the evaporator / condenser.

That is, as shown in FIG. 2, the heat pump 2 includes the refrigerant compressed in the compressor 6 of the condensation / evaporator 20, the expansion mechanism 30, the evaporation / condenser 40, and the compressor 6. As shown in FIG. 3, the heating cycle circuit circulated in sequence, and the refrigerant compressed in the compressor 2, are evaporated / condenser 40, the expansion mechanism 30, the condensation / evaporator 20, and the compressor 2. It has a defrost cycle circuit circulated in the order of.

In the heating operation of the heating / defrost switching valve 50, the refrigerant compressed by the compressor 6 passes through the condensation / evaporator 20, the expansion mechanism 30, and the evaporation / condenser 40, and then passes through the compressor 6. In this case, the condenser / evaporator 20 functions as a condenser for condensing the refrigerant, and the evaporator / condenser 40 functions as an evaporator for evaporating the refrigerant.

On the other hand, during the defrosting operation of the heating / defrost switching valve 50, the refrigerant compressed by the compressor 6 passes through the evaporator / condenser 40, the expansion mechanism 30, and the condenser / evaporator 20, and then the compressor ( 6), the evaporator / condenser 40 functions as a condenser for condensing the refrigerant, and the condenser / evaporator 20 functions as an evaporator for evaporating the refrigerant.

That is, in the heat pump 2, the compressor 6 is driven, the heating / defrost switching valve 50 is switched to the heating operation, and when the opening degree of the expansion mechanism 30 is adjusted, the refrigerant is compressed in the compressor 6. Compressed refrigerant is condensed while releasing heat to the condensation / evaporator 20 while passing through the condensation passage 12 of the condensation / evaporator 20, the condensed refrigerant is expanded while passing through the expansion mechanism 30, The expanded refrigerant has a heating cycle circuit which is evaporated while passing through the evaporator / condenser 40 and circulated to the compressor 6.

On the other hand, when the compressor 6 is driven, the heating / defrost switching valve 50 is switched to cooling / defrosting operation, and the opening degree of the expansion mechanism 30 is adjusted, the heat pump 2 is operated at the compressor 6. The refrigerant is compressed, the compressed refrigerant is condensed by releasing heat while passing through the evaporator / condenser 40, the condensed refrigerant is expanded while passing through the expansion mechanism 30, the expanded refrigerant is condensed / evaporator 20 It has a defrost cycle circuit which is evaporated while passing through the condensation passage 12 and circulated to the compressor 6.

The water circulation circuit 4 allows the water heat-exchanged with the refrigerant in the condensation / evaporator 20 to heat a heat demand such as a floor. As illustrated in FIG. 1, the water circulation circuit 4 includes a hot water supply pipe 60 embedded in the floor. do.

The water circulation circuit 4 includes a heat transfer passage 70 formed in the condensation / evaporator 20, as shown in Figs. The hot water supply pipe 60 and the heat transfer flow path 70 includes a hot water supply pipe-heat transfer flow path connecting pipe 80.

The hot water supply pipe 60 is a kind of heat transfer part or heat exchanger that transfers the heat transferred from the heat pump 2 to the heat demander, and is a radiator which is located indoors and releases heat to the room, or a hot water tank containing water used for the hot water supply. A hot water tank heating pipe provided to heat water in the hot water tank, or a heating pipe embedded in a floor of an indoor room, will be described below as a heating pipe installed on the floor.

The heat transfer passage 70 is a kind of water passage through which water passes and heats the condensation / evaporator 20, and is formed to cross flow with the condensation / evaporation passage 22 during the heating operation of the heat pump 2. .

The hot water supply pipe-heat transfer passage connecting pipe 80 is a heat transfer passage inlet pipe 82 between the inlet of the heat transfer passage 70 and the hot water supply pipeline 60 outlet, and the outlet and the hot water supply pipeline of the heat transfer passage 70. (60) a heat transfer path between the inlets and the outlet pipe (84).

In the water circulation circuit 4, the water in the heat transfer passage 70 formed in the condensation / evaporator 20 is connected to the heat transfer passage outlet pipe 84, the hot water supply pipe 60, and the heat transfer passage inlet pipe 82. It further includes a pump 90 for pumping the water so as to circulate through the heat transfer flow path 70 of the condensation / evaporator 20 in turn.

The pump 90 is installed in one of the heat transfer flow passage inlet pipe 82 and the heat transfer flow passage outlet pipe 84, and will be described below as installed in the heat transfer flow passage outlet pipe 84.

The water circulation circuit 4 further includes a heater 100.

The heater 100 heats water separately from the condensation / evaporator 20 or heats water in the defrost mode of the heat pump 2 in case of lack of heat of the condensation / evaporator 20 or rapid hot water supply. It is installed in one of the delivery passage inlet pipe 82 and the heat transfer passage outlet pipe 84, hereinafter, the heat transfer to heat the water flowing toward the hot water supply pipe 60 after passing through the condensation / evaporator (20) It is explained that it is provided in the flow path outlet pipe 84.

The heater 100 includes a cylinder in which a water inlet and a water outlet are formed to pass water, a heat generation unit such as a seed heater installed inside the cylinder, and a heater heat source unit supplying power to the heat generation unit.

The heater 100 is connected to an air discharge passage 102 for discharging air in the cylinder, and the air discharge passage 102 is provided with an air valve 104 for opening and closing the air discharge passage 102.

The water circulation circuit 4 further includes a flow sensor 120 for detecting the water flow of the water circulation circuit 4.

The water circulation circuit 4 is configured such that water passes through the condensation / evaporator 20, the flow sensor 120, the heater 100, the pump 90, and the hot water supply pipe 60 in order.

That is, the heat transfer flow path outlet pipe 84 is a heat transfer flow path-flow sensor connection pipe 85 between the heat transfer flow path 70 of the condensation / evaporator 20 and the flow sensor 120, and the flow sensor 120. And the flow sensor-heater connection pipe 86 between the heater 100 and the heater-pump connection pipe 87 between the heater 100 and the pump 90, and between the pump 90 and the hot water supply pipe 60. Pump-water supply pipe connection pipe (88).

The water circuit 4 further includes an expansion tank 130 in which water is expanded.

The expansion tank 130 is connected to the flow sensor-heater connection pipe 86 and the expansion tank connector 89 which are after the flow sensor 120 and before the heater 100 in the order of water flow.

The heat pump water heater according to the present embodiment may have a configuration other than the hot water supply pipe 60 in one chassis and constitute one heat pump hot water supply unit, and may include an outdoor unit (O: Out Door Unit) and a hot water supply unit ( It is also possible to be divided into a plurality of units of the H: Hydro kit, it will be described as including an outdoor unit (O: Out Door Unit) and a hot water unit (H: Hydro kit).

The outdoor unit O is installed outdoors, and the hot water unit H is installed indoors.

The compressor 6, the expansion mechanism 30, the evaporation / condenser 40, the heating / defrost switching valve 50, and the like except for the condensation / evaporator 20 of the heat pump 2 have a noise generated by the compressor 6. It is installed in the outdoor unit (O) to blow the outdoor air to the evaporator / condenser 40 without being transmitted to.

Since the condensation / evaporator 20 of the heat pump 2 is provided with a heat transfer passage 70 through which water passes, it is preferable that the condensation / evaporator 20 is installed indoors instead of outdoors so that the water does not freeze. Is installed.

The heat pump 2 has a condensation / evaporator 20 installed in the hot water supply unit H, a refrigerant pipe 23 connecting the condensation / evaporator 20 and the compressor 6, and the condensation / evaporator 20. And a refrigerant pipe 24 connecting the expansion mechanism 30 to the hot water supply unit H and the outdoor unit O.

That is, the outdoor unit O includes an outdoor unit chassis in which an air inlet and an air outlet are formed so that the outdoor air is sucked out, the compressor 6, the expansion mechanism 30, and the evaporator / condenser 40 installed inside the outdoor unit chassis. And heating / defrost switching valve 50 and the like.

 The water circulation circuit 20 includes a hot water supply pipe 60 embedded in a floor, such as a hot water source, and includes a pump 90, a heater 100, a flow sensor 120, and an expansion tank 130 having a configuration other than the hot water supply pipe 60. ) Is installed in the hot water supply unit (H) together with the condensation / evaporator (20).

Here, the hot water supply unit H may be installed in the room itself to be heated, or may be installed in a utility room, a veranda, a basement, or the like that is other than the room to be heated.

The water circulation circuit 4 is embedded in the floor of the room where the hot water supply pipe 60 is to be heated, and heat connecting the outlet of the hot water supply pipe 60 and the inlet of the heat transfer path 70 of the condensation / evaporator 20. A delivery flow passage inlet pipe 82 passes through the hot water supply unit H and is disposed between the hot water supply unit H and the hot water supply pipe 60, and the heat transfer flow path outlet pipe 84, in particular, a pump-water supply pipe connection pipe 88. It penetrates this hot water supply unit H, and is arrange | positioned between the hot water supply unit H and the hot water supply piping 60.

5 is a control block diagram of an embodiment of a heat pump water heater according to the present invention.

The heat pump water heater according to the present embodiment further includes a heater sensor capable of detecting a malfunction of the heater 100.

Here, the heater sensor includes a heater output temperature sensor 140 for detecting the temperature of the water passing through the heater 100, that is, the temperature of the water flowing out of the heater 100 to the hot water supply pipe 40, the heat pump (2) When the drive and the pump 90 of the drive and the heater 100 is on when the sensed temperature of the heater output temperature sensor 140 is the drive of the heat pump 2 and the pump 90 is driven and the heater 100 is off If the set value (eg, 3 ° C.) or more is higher than the detected temperature of the heater output temperature sensor 140, it is determined that the heater 100 is normal. Otherwise, the heater 100 is determined to be malfunctioning.

The heat pump water heater according to the present embodiment further includes a load sensor for determining the load of the hot water source, in particular the hot water supply pipe 60.

 The load sensor is a temperature sensor that detects the water temperature passing through the water circulation circuit 4 and condenses in the hot water supply pipe 60, that is, the water flowing into the condensation / evaporator 20 after passing the hot water supply pipe 60. Consists of the condensation / evaporator water inlet temperature sensor 142 for detecting the temperature of the water to be moved to / evaporator (20).

 The condensation / evaporator water inlet temperature sensor 142 is installed on the heat transfer passage inlet pipe 82 of the hot water supply pipe-heat transfer flow path connecting pipe 80, and the water passing through the hot water supply pipe 60 condenses / evaporator ( Detecting the temperature immediately before flowing into 20) can detect the actual load most accurately, and is installed in a portion of the heat transfer flow inlet pipe 82 located in the hot water supply unit H.

Meanwhile, the heat pump water heater includes a temperature controller 150 for inputting a hot water command or a desired temperature, an indoor temperature sensor 160 for sensing an indoor temperature, and an input and a flow sensor 120 of the temperature controller 150. The control unit 170 further controls the heat pump 2 and the water circulation circuit 4 according to the detection of the condensation / evaporator water inlet temperature sensor 142 and the indoor temperature sensor 160.

The temperature control unit 150 is preferably installed indoors so as to adjust the hot water temperature in the room.

The room temperature sensor 160 may be installed separately from the temperature control unit 150, or may be installed in the temperature control unit 150 to form a part of the temperature control unit 150.

The control unit 170 is installed in the outdoor unit (O) and the various electrical components of the hot water supply unit (H), for example, the pump 90 and the heater 100, the flow sensor 120 and the condensation / evaporator water inlet temperature sensor ( 142) and a cable such as an electric wire, and also can be connected to the temperature control unit 150 and a cable such as an electric wire, installed in the hot water supply unit (H), for example, various electrical components of the outdoor unit (O), The compressor 6, the expansion mechanism 30, the outdoor fan 46, and the like may be connected to a cable such as an electric wire, and the temperature controller 150 may be connected to a cable such as an electric wire. It is also possible to be connected and connected with various electric parts of the hot water supply unit H and various electric parts of the outdoor unit O with a cable such as an electric wire.

Since the control unit 170 is equipped with various electric components on the circuit board, in consideration of the service life, reliability and service convenience, it is preferable that the control unit 170 is installed in the hot water supply unit H or the temperature control unit 150, and the control unit 170. Is installed in the temperature control unit 150, the size of the temperature control unit 150 may be large, the indoor space can be narrowed, and a cable such as a wire between the temperature control unit 150 and the hot water supply unit (H) It is preferably thickened and installed in the hot water supply unit (H) so as to minimize the length of the cable, such as the wire between the condensation / evaporator water inlet temperature sensor 142 and the control unit 170.

On the other hand, the control unit 170 as described above, the defrost command is input through the temperature control unit 150 during the heating operation of the heat pump 2, or to determine whether the defrost of the evaporator / condenser 40 (evaporation / condenser ( The temperature of the defrost sensor (not shown) that senses the temperature of 40 is less than the set value, or the measurement time of the timer 180 that measures the integration time of the heating operation or the like to periodically defrost the defrost / condenser 40 is set. When the heating operation of the heat pump 2 satisfies the defrost condition, such as when the time (for example, one hour) elapses, the heat pump 2 is driven by the defrost operation.

When the heater 100 is turned off during the defrosting operation of the heat pump 2, the control unit 170 opens the condensation / evaporation flow path 22 of the condensation / evaporator 20 when water passed through the hot water supply pipe 60. After passing through the condensation / evaporator while passing through the hot water supply pipe (60) to cool the floor, the water passed through the condensation / evaporation flow path 22 of the condensation / evaporator 20, the heater 100 After being heated while passing, the heater 100 is turned on so as to flow into the hot water supply pipe 60 to heat the floor.

Hereinafter, the operation of the heat pump water heater according to the present invention configured as described above are as follows.

6 is a flowchart illustrating an embodiment of a control method of a heat pump water heater according to the present invention.

 First, when a user or the like manipulates the temperature controller 150 to input a hot water command and inputs a desired room temperature, the controller 170 controls the water circulation circuit 4 according to the operation of the temperature controller 150. To control. That is, the controller 170 drives the pump 90 to circulate water to the water circulation circuit (4). (S1) (S2)

When the pump 90 is driven, the water of the hot water supply pipe 60 passes through the heat transfer passage inlet pipe 82 and then through the heat transfer passage 70 of the condensation / evaporator 20, and then exits the heat transfer passage. It passes through the pipe 84 and circulates to the hot water supply pipe 60.

The condensation / evaporator water inlet temperature sensor 142 detects the temperature of the water flowing into the heat transfer passage 70 of the condensation / evaporator 20 after passing through the water circulation circuit 4, in particular, the hot water supply pipe 60. do.

The condenser / evaporator water inlet temperature sensor 142 outputs the sensed temperature to the controller 170, and the controller 170 determines the hot water load, in particular the hot water supply load of the hot water supply pipe 60, according to the sensed temperature.

Here, the control unit 170 is determined by the water temperature and room temperature detected by the condensation / evaporator water inlet temperature sensor 142, the water temperature detected by the condensation / evaporator water inlet temperature sensor 142 And the hot water supply load is determined using the difference between the desired room temperature (hereinafter, referred to as room temperature) input to the temperature controller 150.

That is, when the difference between the water temperature detected by the condensation / evaporator water inlet temperature sensor 142 and the room temperature of the temperature controller 150 is large, the controller 170 determines that the hot water supply load is large, and the condensation / evaporator water inlet When the difference between the water temperature sensed by the temperature sensor 142 and the room temperature of the temperature controller 150 is small, it is determined that the hot water load is small, and the hot water load is determined in multiple stages according to the size of the car.

The control unit 170 operates the heating / defrost switching valve 50 as a heating operation, and drives the heat pump 2, in particular the compressor 6 and the expansion mechanism 30, in accordance with the size of the hot water load.

 When the hot water load is large, the controller 170 starts the compressor 6 so that the compression capacity of the compressor 6 is large, and controls the expansion mechanism 30 so that the opening value of the expansion mechanism 30 is large. On the other hand, when the hot water load is small, the controller 170 starts the compressor 6 so that the compression capacity of the compressor 6 is small, and controls the expansion mechanism 30 so that the opening value of the expansion mechanism 30 is small. do.

In the control as described above, the refrigerant is circulated in a heating cycle circuit circulated in the order of the compressor 6, the condensation / evaporator 20, the expansion mechanism 30, the evaporation / condenser 40, and the compressor 6, and water. The water in the circulation circuit 4 is heated while passing through the heat transfer passage 70 of the condensation / evaporator 20, and then flows through the heater 100 and the pump 90 in order to flow into the hot water supply pipe 60, and the hot water is supplied. The heat is discharged to the surroundings while passing through the pipe 60, and then circulated to the heat transfer path 70 of the condensation / evaporator 20.

Meanwhile, the controller 170 controls the heater 100 after the heating operation of the heat pump 2 is started together with the heating operation of the heat pump 2 as described above.

 The controller 170 may turn on the heater 100 together with the driving of the heat pump 2 so that the water is initially heated quickly, and despite the heating operation of the heat pump 2, the water temperature is set at a predetermined time ( For example, the heater 100 may be turned on when the hot water load does not correspond to the hot water load within 10 minutes or when the rate of increase in the water temperature due to the heating operation of the heat pump 2 is lower than the set speed.

After the heater 100 is turned on as described above, the controller 170 reaches the heater off set time or the hot water load is released by the heating operation of the heat pump 2 and the on of the heater 100, or the heat pump ( When the rising speed of the water temperature according to the heating operation of 2) becomes faster than the set speed, the heater 100 is turned off.

On the other hand, when the defrost condition is satisfied during the heating operation of the heat pump 2 as described above, the controller 170 turns on the heater 100 and drives the heat pump 2 to defrost. For example, when the heating operation time of the heat pump 2 integrated in the timer 180 reaches the defrost start setting time (for example, 1 hour), the controller 170 turns on the heater 100 and The heating operation of the heat pump 2 is stopped as described above, the heater 100 is turned on for the defrosting completion set time (for example, 10 minutes), and the heat pump 2 is defrosted. (S4) (S5) (S6)

That is, the controller 170 stops the compressor 6 which is being driven during the heating operation of the heat pump 2, and when the compressor re-drive setting time has elapsed, switches the heating / defrost switching valve 50 to the defrost operation. In addition, the compressor 6 is restarted.

In the control as described above, the refrigerant is circulated in the defrost cycle circuit circulated in the order of the compressor 6, the evaporator / condenser 40, the expansion mechanism 30, the condensation / evaporator 20, and the compressor 6. The water in the circulation circuit 4 loses heat to the condensation / evaporator 20 while passing through the heat transfer passage 70 of the condensation / evaporator 20, and passes through the heat transfer passage 70 of the condensation / evaporator 20. After it is heated by the heater 100 while passing through the heater 100.

Water heated by the heater 100 flows into the hot water supply pipe 60 through the pump 90, and discharges heat to the surroundings while passing the hot water supply pipe 60 to heat a heat demand such as a floor. That is, the hot water supply pipe 60 continuously heats heat demands such as a floor even during the defrosting operation of the heat pump 2.

On the other hand, since the water passing through the hot water supply pipe 60 heated the heat demand such as a floor in the state heated by the heater 100, the proper temperature range is maintained even after passing the hot water supply pipe 60, While passing through the heat transfer flow path 70 of the condensation / evaporator 20, the heat is deprived of the refrigerant passing through the condensation / evaporation flow path 22 of the condensation / evaporator 20, where water maintains an appropriate temperature range. Since the heat exchange performance of the condensation / evaporator 20 is high, the evaporation efficiency of the condensation / evaporator 20 is high, the heat exchange performance of the evaporation / condenser 40 is high, the condensation efficiency of the evaporation / condenser 40 is high, defrost time This is shortened.

On the contrary, when the heater 100 is turned off during the defrosting operation of the heat pump 2, the water passing through the heat transfer flow path 70 of the condensation / evaporator 20 flows into the hot water supply pipe 60 at a low temperature to supply hot water. Since the heat demands such as the pipe 60 and the floor are cooled, the heat loss of the heat demands such as the floor is relatively large, and then the heat transfer flow path 70 of the condensation / evaporator 20 is kept at a lower temperature than the heater 100 is turned on. The heat is taken away by the refrigerant while passing through the heat sink. At this time, since water is at a lower temperature than the heater 100 is turned on, the heat exchange performance of the condenser / evaporator 20 is relatively low, so that the evaporation efficiency of the condenser / evaporator 20 is increased. Since the heat exchange performance of the evaporator / condenser 40 is low and the evaporation / condenser 40 is low, the defrosting time is long.

On the other hand, as described above, when the defrost termination condition is satisfied after the heating operation of the heat pump 2 and the on of the heater 100, the heater 100 is turned off, and the heat pump 2 is heated again. For example, when the defrost time accumulated in the timer 180 reaches the defrosting completion time (for example, 10 minutes), the heater 100 is turned off, and the defrosting operation of the heat pump 2 is performed as described above. It stops and heat-operates the heat pump 2 again. (S7) (S8) (S9)

That is, the controller 170 stops the compressor 6 which is being driven during the defrosting operation of the heat pump 2, and switches the heating / defrosting switching valve 50 to the heating operation when the compressor re-drive setting time elapses. In addition, the compressor 6 is restarted.

 Upon returning to the heating operation of the heat pump 2 as described above, the refrigerant is circulated in the order of the compressor 6, the condenser / evaporator 20, the expansion mechanism 30, the evaporator / condenser 40, and the compressor 6. The water is circulated back to the heating cycle circuit, and the water of the water circulation circuit 4 is heated while passing through the heat transfer passage 70 of the condensation / evaporator 20 and then passes through the heater 100 and the pump 90 to supply hot water. After flowing into the pipe 60, the heat is discharged to the surroundings while passing through the hot water supply pipe 60, and then circulated to the heat transfer path 70 of the condensation / evaporator 20.

  Meanwhile, the controller 170 controls the compressor 6, the expansion mechanism 30, and the pump 90 according to the fluctuation of the hot water load after the driving as described above.

The controller 170 stops the heat pump 2 so that the refrigerant is not circulated to the condensation / evaporator 20 when the hot water load is released as described below during the operation of the compressor 6 and the expansion mechanism 30. That is, the controller 170 turns off the compressor 6 and controls the expansion mechanism 30 to close the expansion mechanism 30. (S10) (S11)

Here, the hot water load, if the room temperature detected by the room temperature sensor 160 is more than the room temperature set in the temperature control unit 150, it may be determined that the solution is eliminated, condensation / evaporator water inlet temperature sensor 142 When the difference between the detected water temperature and the room temperature of the temperature control unit 150 is within a set difference (that is, a range where the actual temperature of the room and the temperature of the condenser / evaporator 20 are close to each other), it is determined that the solution has been eliminated. Of course it is also possible.

On the other hand, the control unit 170 is condensed when the set time elapses at the same time as the off of the compressor 6 and the closing of the expansion mechanism 30 or after the off of the compressor 6 and the closing of the expansion mechanism 30. The water circulation circuit 4 is controlled so that the water is not circulated to the evaporator 20.

That is, the controller 170 turns off the pump 90. (S12) Here, the controller 170 turns off the compressor 6 so that the heat of the condensation / evaporator 20 is transferred to the hot water supply pipe 60 as much as possible. It is preferable to turn off the pump 90 after the set time has elapsed after the expansion mechanism 30 is closed.

7 is a detailed block diagram illustrating a water circulation circuit of another embodiment of the heat pump water heater according to the present invention, and FIG. 8 is a control block diagram of another embodiment of the heat pump water heater according to the present invention.

In the heat pump water heater according to the present embodiment, the hot water supply pipe bypass installed so that the water passing through the pump 90 bypasses the hot water supply pipe 60 and flows into the heat transfer flow path 22 of the condensation / evaporator 20. It further includes a pass means 190, and other configurations and actions other than the bypass means 190 are the same or similar to one embodiment of the present invention, so the same reference numerals are used and detailed description thereof will be omitted.

 The hot water supply pipe bypass means 190 includes a bypass valve 192 installed between the pump 90 and the hot water supply pipe 60 and controlled by the controller 170, the bypass valve 90 and the condensation / evaporator ( 20) a bypass pipe 194 connecting the inlet of the heat transfer path 22.

The bypass valve 192 is installed in the pump-hot water supply pipe connection pipe 88, and consists of a three-way valve to which the bypass pipe 194 is connected.

The bypass pipe 194 has one end connected to the bypass valve 192 and the other end connected to the heat transfer flow passage inlet pipe 82, and the temperature of the water passing through the bypass pipe 194 is the condensation / evaporator water inlet temperature. It is connected between the condensation / evaporator water inlet temperature sensor 142 and the hot water supply pipe 40 of the heat transfer passage inlet pipe 82 so that it can be detected by the sensor 142.

 The controller 170 controls the bypass valve 192 in the hot water supply pipe supply mode during the heating operation of the heat pump 2, and controls the bypass valve 192 in the condensation / evaporator supply mode during the defrosting operation of the heat pump 2. To control.

The control unit 170 controls the bypass valve 192 in the condensation / evaporator supply mode at the start of the defrosting operation of the heat pump 2, and simultaneously controls the bypass valve 192 at the completion of the defrosting operation of the heat pump 2. It is also possible to control the hot water supply pipe supply mode, and if the water temperature detected by the condensation / evaporator water inlet temperature sensor 142 is higher than the set temperature, it is also possible to control the bypass valve 192 to the hot water supply pipe supply mode.

Here, the set temperature is a reference temperature for determining whether the water bypassing the hot water supply pipe 60 through the bypass valve 192 and the bypass pipe 194 is a temperature sufficient to heat the hot water supply pipe 60. to be.

 9 is a flow chart of another embodiment of a control method of a heat pump water heater according to the present invention.

In the control method of the heat pump water heater according to the present embodiment, as shown in FIG. 9, when a user or the like inputs a hot water command by inputting a hot water command and a desired room temperature, the controller ( 170 controls the water circulation circuit 4 in accordance with the operation of the temperature control unit 150. That is, the controller 170 drives the pump 90 to circulate the water in the water circulation circuit 4, and controls the bypass valve 192 in the hot water supply pipe supply mode. (S1) (S2)

When the pump 90 is driven, the water of the hot water supply pipe 60 passes through the heat transfer passage inlet pipe 82 and then through the heat transfer passage 70 of the condensation / evaporator 20, and then exits the heat transfer passage. It passes through the piping 84 especially the bypass valve 192, and is circulated to the hot water supply piping 60.

The condensation / evaporator water inlet temperature sensor 142 detects the temperature of the water flowing into the heat transfer passage 70 of the condensation / evaporator 20 after passing through the water circulation circuit 4, in particular, the hot water supply pipe 60. do.

The condenser / evaporator water inlet temperature sensor 142 outputs the sensed temperature to the controller 170, and the controller 170 determines the hot water load, in particular the hot water supply load of the hot water supply pipe 60, according to the sensed temperature. The determination of the hot water load and the heating operation of the heat pump 2 are the same as in the exemplary embodiment of the present invention, and thus a detailed description thereof will be omitted.

That is, the control unit 170 turns on the heating / defrost switching valve 50 and drives the heat pump 2, in particular the compressor 6 and the expansion mechanism 30, in accordance with the size of the hot water load (S3).

In the control as described above, the refrigerant is circulated in a heating cycle circuit circulated in the order of the compressor 6, the condensation / evaporator 20, the expansion mechanism 30, the evaporation / condenser 40, and the compressor 6, and water. The water in the circulation circuit 4 is heated while passing through the heat transfer passage 70 of the condensation / evaporator 20, and then passes through the heater 100, the pump 90, and the bypass valve 192 in order to supply the hot water supply pipe ( 60, is discharged to the surroundings while passing through the hot water supply pipe 60, and then circulated to the heat transfer flow path 70 of the condensation / evaporator 20.

On the other hand, the control unit 170 may control the heater 100 after the start of the heating operation of the heat pump 2 together with the heating operation of the heat pump 2 as described above, and during the heating operation of the heat pump 2 Since the control to turn on / off the heater 100 is the same as the embodiment of the present invention, detailed description thereof will be omitted.

On the other hand, when the defrost condition is satisfied during the heating operation of the heat pump 2 as described above, the controller 170 turns on the heater 100 and drives the heat pump 2 to defrost. For example, when the heating operation time of the heat pump 2 integrated in the timer 180 reaches the defrost start setting time (for example, 1 hour), the controller 170 turns on the heater 100 and The heating operation of the heat pump 2 is stopped, the heater 100 is turned on, the bypass valve 192 is controlled in the condensation / evaporator supply mode, and the heat pump 2 is defrosted. S4) (S5 ') (S6)

That is, the controller 170 stops the compressor 6 which is being driven during the heating operation of the heat pump 2, and when the compressor re-drive setting time has elapsed, switches the heating / defrost switching valve 50 to defrost operation. In addition, the compressor 6 is restarted.

In the control as described above, the refrigerant is circulated in the defrost cycle circuit circulated in the order of the compressor 6, the evaporator / condenser 40, the expansion mechanism 30, the condensation / evaporator 20, and the compressor 6. The water in the circulation circuit 4 loses heat to the condensation / evaporator 20 while passing through the heat transfer passage 70 of the condensation / evaporator 20, and passes through the heat transfer passage 70 of the condensation / evaporator 20. After it is heated by the heater 100 while passing through the heater 100.

The water heated by the heater 100 is moved to the bypass pipe 194 by the bypass valve 192 passing through the pump 90 to bypass the hot water supply pipe 60, that is, the hot water supply pipe 60. In the defrosting operation of the heat pump 2), the low-temperature water deprived of heat while flowing through the condenser / evaporator is not introduced.

Meanwhile, the water passing through the bypass pipe 194 passes through the heat transfer path 70 of the condensation / evaporator 20 while being heated by the heater 100, and condensation / evaporation path of the condensation / evaporator 20 ( 22, the heat is lost to the refrigerant passing through, in this case, since the water is a state of high temperature heated by the heater 100, not only the heat exchange performance of the condensation / evaporator 20 is high, but also the evaporation of the condensation / evaporator 20 Since the efficiency is high, the heat exchange performance of the evaporator / condenser 40 is high, and the condensation efficiency of the evaporator / condenser 40 is high, the defrost time is shortened.

On the other hand, as described above, if the defrost termination condition is satisfied after the heating operation of the heat pump 2 and the on of the heater 100, the heater 100 is turned off, and the heat pump 2 is heated again. For example, when the defrosting time accumulated in the timer 180 reaches the defrosting completion time (for example, 10 minutes), the heater 100 is turned off and the defrosting operation of the heat pump 2 is performed as described above. The heat pump 2 is heated again. (S7) (S8) (S9)

That is, the controller 170 stops the compressor 6 which is being driven during the defrosting operation of the heat pump 2, and switches the heating / defrosting switching valve 50 to the heating operation when the compressor re-drive setting time elapses. In addition, the compressor 6 is restarted.

 Upon returning to the heating operation of the heat pump 2 as described above, the refrigerant is circulated in the order of the compressor 6, the condenser / evaporator 20, the expansion mechanism 30, the evaporator / condenser 40, and the compressor 6. Circulated back to the heating cycle circuit, the water in the water circulation circuit 4 is heated while passing through the heat transfer flow path 70 of the condensation / evaporator 20, and then passes through the heater 100 and the pump 90 in turn. Thereafter, the hot water supply pipe 60 is bypassed while passing through the bypass valve 192 and the bypass pipe 194, and is circulated to the heat transfer path 70 of the condensation / evaporator 2.

In the circulation as described above, the water in the water circulation circuit (4) is raised in temperature by heat exchange with the condensation / evaporator 20, the control unit 170 is the set temperature detected by the condensation / evaporator water inlet temperature sensor 142 If it is abnormal, it is determined that the water is sufficiently heated, and the bypass valve 192 is switched to the hot water supply pipe supply mode. (S10 ') (S11')

Here, when the bypass valve 192 is switched to the hot water supply pipe supply mode irrespective of the water temperature, low temperature water may flow into the hot water supply pipe 60, and low temperature water may flow into the hot water supply pipe 60. In this case, the heat demand temperature such as a floor is lowered, and thus the heating performance may be reduced. When the temperature detected by the condensation / evaporator water inlet temperature sensor 142 is higher than the set value, the bypass valve 192 is supplied with hot water supply pipe. By switching to the mode, it is possible to prevent the above deterioration of heating performance.

In the hot water supply pipe supply mode as described above, the water passing through the heat transfer flow path 70 of the condensation / evaporator 20 is connected to the heater 100, the pump 90, and the bypass valve 192. Passes in order to flow into the hot water supply pipe 60, and transmits the heat of the condensation / evaporator 20 to the hot water supply pipe (60). The water deprived of heat to the hot water supply pipe 60 while passing through the hot water supply pipe 60 is circulated in the condensation / evaporator 20, and the hot water supply pipe 60 is heated during the circulation of the water as described above.

  Meanwhile, the controller 170 controls the compressor 6, the expansion mechanism 30, and the pump 90 according to the fluctuation of the hot water load after the driving as described above.

The controller 170 stops the heat pump 2 so that the refrigerant is not circulated to the condensation / evaporator 20 when the hot water load is released as described below during the operation of the compressor 6 and the expansion mechanism 30. That is, the controller 170 turns off the compressor 6 and controls the expansion mechanism 30 to close the expansion mechanism 30. (S12 ') (S13')

Hereinafter, the solution of the hot water load, and thus the closing of the compressor 6 and the closing of the expansion mechanism 30 are the same as in the exemplary embodiment of the present invention, and thus detailed description thereof is omitted.

On the other hand, the control unit 170 is condensed when the set time elapses at the same time as the off of the compressor 6 and the closing of the expansion mechanism 30 or after the off of the compressor 6 and the closing of the expansion mechanism 30. The water circulation circuit 4 is controlled so that the water is not circulated to the evaporator 20.

That is, the control unit 170 turns off the pump 90 (S14 ').

On the other hand, the present invention is not limited to the above embodiment, the defrosting condition and the end condition of the defrost is determined according to the temperature value of the defrost sensor installed in the evaporator / condenser 40, of the defrost sensor to detect the temperature of the evaporator / condenser If the detected temperature is lower than the set value, the defrosting operation is performed, and if the detected temperature of the defrost sensor is higher than the set value during the defrosting operation, the defrosting operation can be terminated, and various implementations can be made within the technical scope of the present invention. .

1 is a schematic configuration diagram of an embodiment of a heat pump water heater according to the present invention;

Figure 2 is a detailed configuration of the heating operation of the heat pump hot water heater according to an embodiment of the present invention,

3 is a detailed configuration of the defrosting operation of the heat pump water heater according to an embodiment of the present invention,

4 is a detailed configuration diagram of a water circulation circuit of an embodiment of a heat pump water heater according to the present invention;

5 is a control block diagram of an embodiment of a heat pump water heater according to the present invention;

6 is a flow chart illustrating an embodiment of a control method of a heat pump water heater according to the present invention;

7 is a detailed configuration diagram illustrating a water circulation circuit of another embodiment of a heat pump water heater according to the present invention;

8 is a control block diagram of another embodiment of the heat pump water heater according to the present invention;

 9 is a flow chart of another embodiment of a control method of a heat pump water heater according to the present invention.

<Explanation of symbols on main parts of the drawings>

2: heat pump 4: water circuit

6: compressor 20: water refrigerant heat exchanger

30: expansion mechanism 40: evaporator

60: hot water supply pipe 70: water heating flow path

80: heat transfer euro-hot water supply pipe connection pipe

82: heat transfer flow path inlet pipe 84: heat transfer flow path outlet pipe

90: pump 100: heater

140: heater exit temperature sensor 142: condenser / evaporator water inlet sensor

150: temperature control unit 170: control unit

180: timer 190: bypass means

192: bypass valve 194: bypass piping

Claims (11)

A heat pump including a compressor, a condenser / evaporator, an expansion mechanism, an evaporator / condenser, and a heating / defrost switching valve; A water circulation circuit including a pump configured to circulate the water after the heat is exchanged with the condensation / evaporator and sequentially passed through a heater and a hot water supply pipe to the condensation / evaporator; And a control unit which turns on the heater during the defrosting operation of the heat pump. The method of claim 1, The water circulation circuit is configured such that water flows in order of condensation / evaporator, heater, pump, and hot water supply piping, The heat pump water heater further includes a hot water supply pipe bypass means installed so that the water passing through the pump bypasses the hot water supply pipe and flows into the condensation / evaporator. The method of claim 2, The hot water supply pipe bypass means is connected between the pump and the hot water supply pipe and a bypass valve controlled by the controller, and a connection pipe connecting the outlet of the hot water supply pipe and the inlet of the evaporation / hot water heat exchanger. Heat pump water heater with bypass piping connecting the pass valve. The method of claim 3, wherein The control unit controls the bypass valve in the hot water supply pipe supply mode during the heating operation of the heat pump, The heat pump hot water heater for controlling the bypass valve in the condensation / evaporator supply mode during the defrost operation of the heat pump. The method of claim 4, wherein Further comprising a condensation / evaporator water inlet temperature sensor for detecting the temperature of the water flowing into the condensation / evaporator, The control unit controls the bypass valve in the condensation / evaporator supply mode, and if the temperature of the water detected by the water inlet temperature sensor is higher than the set value, the heat pump hot water heater for controlling the bypass valve in the hot water supply pipe supply mode. A heat pump heating operation step of driving the pump according to the load of the hot water supply pipe and heating the heat pump; A heater on defrosting step of turning on the heater between the condensation / evaporator of the heat pump and the hot water supply pipe of the water circulation circuit if the defrost condition is satisfied during the driving of the pump and the heating operation of the heat pump; And a defrosting end step of turning off the heater and heating the heat pump after the heater on defrosting step. The method of claim 6, The defrosting condition is a control method of a heat pump water heater, wherein the heating operation integration time of the heat pump reaches a defrosting start set time. The method of claim 6, The defrost end step is a control method of the heat pump hot water heater is performed when the defrost completion set time after the heater-on defrost step. The method of claim 6, The defrost condition is a control method of the heat pump hot water heater is a condition that the sensing temperature of the defrost sensor for detecting the temperature of the evaporator / condenser is less than a set value. The method of claim 6, The defrost end step is performed if the detected temperature of the defrost sensor for detecting the temperature of the evaporator / condenser after the heater on defrost step is more than a set value. The method of claim 6, The heater on defrosting step controls the bypass valve between the heater and the hot water supply pipe to the condensation / evaporator supply mode, And the bypass valve is controlled to be in a hot water supply pipe supply mode if the water temperature flowing into the condensation / evaporator after the defrost end step is equal to or greater than a predetermined value.

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