KR20080050324A - Heat pump hot water device - Google Patents

Abstract

A heat pump-type hot water supply apparatus is provided to prevent the operation of the heat pump-type hot water supply apparatus from being stopped because the short-term operation of a compressor is avoided. A heat pump-type hot water supply device(100) includes a heat pump-type refrigeration circuit and a tank(21). The tank stores water heated from the heat pump-type refrigeration circuit. Water supplied from the heat pump-type refrigeration circuit and the tank is able to be supplied to terminals(19,36a). The heat pump-type refrigeration circuit is continuously driven if the supply of water to the terminals is stopped in a predetermined time after the operation of the heat pump-type refrigeration circuit is commenced. Water heated by the heat pump-type refrigeration circuit is stored in the tank.

Description

Heat Pump Hot Water Supply Unit {HEAT PUMP HOT WATER DEVICE}

The present invention relates to a heat pump type hot water supply device.

The heat pump hot water supply device is roughly divided into a low temperature type heat pump hot water supply device and an instantaneous heat pump hot water supply device. Patent Document 1 describes an example of a conventional low temperature type heat pump hot water supply device. The heat capacity of the heat pump hot water supply apparatus described in this publication is about 4.5 to 6 kW, and boils in a hot water of 65 to 90 ° C. using inexpensive night power at night time. The hot water boiled is stored in a storage tank having a capacity of 300 to 480 liters. At the time of hot water supply, water is mixed and used for the hot water stored in the storage tank.

Patent Literature 2 describes an example of a conventional instantaneous heat pump hot water supply device. In the heat pump hot water supply apparatus described in this publication, the water introduced from the water supply pipe is heated in a water heat exchanger, hot water is supplied to the use terminal as it is, and a large storage tank is not required. Since the heat of condensation cannot be generated enough to warm the water until the pressure condition immediately after the start of operation of the heat pump circuit is stabilized, the water stored in the small hot water tank only for a short time of the rise from the water heat exchanger. Hot water is mixed with water.

Another example of the conventional instantaneous heat pump hot water supply device is described in Patent Document 3. The heat pump hot water supply apparatus described in this publication has a load for setting a predetermined amount of heat in a heat exchanger having a water flow path for exchanging heat with a refrigerant flow path of a radiator of a heat pump cycle in order to enable hot water supply having both responsiveness and stability. And setting means and heating control means for controlling the heating amount of the heat exchanger in accordance with the setting value of the load setting means.

[Patent Document 1] Japanese Unexamined Patent Application Publication No. 2005-147608

[Patent Document 2] Japanese Patent Application Laid-Open No. 2003-279133

[Patent Document 3] Japanese Unexamined Patent Publication No. 2003-240344

In the low-temperature type heat pump hot water supply apparatus described in Patent Document 1, since the hot water is heated and preheated and used, the energy efficiency does not change depending on the hot water pattern if the same amount of hot water is consumed. This is because energy efficiency and the hot water supply pattern are independent. As a result, the energy efficiency of hot water supply becomes the same even if it is a short hot water supply pattern like a toilet, or even a continuous hot water pattern like bath water filling is long. When the hot water bath stored in the water storage tank is used up, the usage which made energy efficiency nearly constant is possible irrespective of the time from a hot water supply start to a hot water stop. However, when the bath of a low boiling water tank is used up, since the heating capacity of a hot water supply apparatus is small, it cannot boil immediately and a water break occurs.

On the other hand, in the instantaneous heat pump apparatus described in Patent Literature 2, for example, a heating capacity of about five times that of a low boiling water type is also possible. As a result, only a necessary amount of water can be boiled when the hot water is desired, and a large storage tank is unnecessary, and a small energy saving can be achieved. In addition, when the temperature of the water heated by the heat pump reaches the set temperature, the hot water from the hot water tank is stopped and hot water is supplied only from the heat pump, so that continuous hot water is possible, and there is no fear of hot water.

However, in the instantaneous heat pump hot water supply device described in Patent Document 2, the heat of the refrigerant gas heated by pressurizing with the compressor at the time of the rise of the heat pump is also consumed to warm the compressor or the water refrigerant heat exchanger. As a result, the amount of heating to the originally required hot water supply water decreases. COP, which is the ratio of the hydrothermal capacity to the power consumption of the heat pump, so-called energy efficiency decreases. This becomes remarkable in the short-breaking hot water supply pattern which stops the operation in the rising state of the heat pump.

Even in the instantaneous boiling water type heat pump hot water supply apparatus described in Patent Document 3, immediately after the hot water is started, the heat of the refrigerant compressed to a high temperature and transferred to the compressor or the water refrigerant heat exchanger is also used to heat the compressor or the water refrigerant heat exchanger. Consumed. As a result, COP of the heat pump hot water supply device immediately after the start of hot water supply decreases, and it becomes difficult to hot water hot water desired by a user by a desired amount.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and an object thereof is to prevent hot water breakage in a heat pump hot water supply device, and to increase energy efficiency regardless of the use pattern of hot water.

A feature of the present invention, which achieves the above object, includes a heat pump refrigerant circuit for heating water, and a boiling water tank for storing water heated by the heat pump refrigerant circuit. A heat pump hot water supply device capable of supplying a stored hot water to a hot water supply terminal, wherein a control device is provided so as not to stop the operation of the heat pump refrigerant circuit until a predetermined time elapses after the heat pump refrigerant circuit is operated. .

In this aspect, the control device operates the heat pump refrigerant circuit to heat water, and supplies water to the hot water supply terminal as a hot water, before the predetermined time has elapsed since the operation of the heat pump refrigerant circuit started operation. When the supply to the hot water supply terminal is stopped, it is preferable to control the water heated in the heat pump refrigerant circuit to be heated in the water storage tank without stopping the operation of the heat pump refrigerant circuit. In addition, the control device may stop the heat pump refrigerant circuit when a predetermined time has elapsed since switching to a low temperature water storage tank or when a liquid level of the water temperature of the hot water tank reaches a predetermined position. Moreover, it is good to make the said predetermined time into 1 minute-5 minutes.

In addition, the water storage tank has outlets of a plurality of water baths, and the outlet water outlets are formed in upper and middle portions of the water storage tank, and the control device switches the outlet water outlets according to the temperature of the water heated in the heat pump refrigerant circuit. It may be. In addition, the heat pump refrigerant circuit has a water refrigerant heat exchanger in which the refrigerant and water exchange heat, a hot water mixing valve for mixing the hot water heated in the water refrigerant heat exchanger with the hot water at the top of the water storage tank, a water refrigerant heat exchanger and a hot water mixing valve, The switching valve which connects the intermediate part of a water storage tank is provided, This switching valve has a switching position which connects a water refrigerant heat exchanger only to a hot water mixing valve, a switching position which communicates a water refrigerant heat exchanger only to the middle part of a water storage tank, and a storage tank It is preferable to have a switching position which communicates the intermediate part of only with a hot water mixing valve.

In addition, when the hot water inlet of the hot water tank is formed in the upper part and the middle part of a water storage tank, and a control device hot-waters only the hot water of this water storage tank, the control apparatus uses the outflow inlet formed in the upper part and middle part of a water storage tank of a water storage tank. It is good to feed the bath. It is preferable that the control device supplies the hot water from the hot water tank when there is a use request of the hot water from the hot water supply terminal, and starts the heat pump refrigerant circuit if the use request continues after a predetermined time elapses. This predetermined time is preferably set to 10 seconds to 1 minute.

According to the present invention, since the short-term operation of the compressor included in the heat pump hot water supply device is avoided, the hot water of the heat pump hot water supply device can be prevented, and the energy efficiency of the heat pump supply device is independent of the usage pattern of the hot water. Is higher.

EMBODIMENT OF THE INVENTION Hereinafter, one Example of the heat pump hot water supply apparatus which concerns on this invention is described based on drawing. 1 and 2 show a system diagram of the heat pump hot water supply device 100. The heat pump hot water supply device 100 includes a heat pump refrigerant circuit 90 and a water supply circuit 91, a hot water supply circuit 92, a bath water filling circuit 93, a bath water reboiling heating circuit 94, and a bath water reboiling endotherm. Circuit 95, tank reheating circuit 96 is roughly divided. The refrigerant in the heat pump refrigerant circuit 90 is carbon dioxide, and hot water can be supplied from the heat pump refrigerant circuit 90.

Next, the configuration is described below for each circuit. The heat pump refrigerant circuit 90 is a compressor (1) compressing a refrigerant to form a high temperature refrigerant, and a water refrigerant in which water (water supply) supplied by the compressor (1) compressed for high temperature and supplied for hot water heat exchanges. A heat exchanger (2), an expansion valve (3) for depressurizing the refrigerant exiting the water refrigerant heat exchanger (2), and an evaporator (4) for evaporating the low temperature low pressure refrigerant exiting the expansion valve (3) are connected by a refrigerant pipe. It is composed.

The compressor 1 is capable of capacitive control by inverter control, and can vary the rotational speed from a low speed (for example, 1000 rpm) to a high speed (for example, 6000 rpm). The evaporator 4 is an air refrigerant heat exchanger and heat exchanges a large amount of outdoor air with a reduced pressure refrigerant by an outdoor fan 5.

The water refrigerant heat exchanger (2) has a refrigerant side heat exchanger tube (2a) and a water side heat transfer tube (2b), and the flow of the refrigerant in the refrigerant side heat transfer tube (2a) and the water flow in the water side heat transfer tube (2b) are opposed to each other. . And the high temperature high pressure refrigerant | coolant and low temperature water heat-exchange. That is, when the low temperature water passes through the water-side heat pipe 2b at the inlet of the water refrigerant heat exchanger 2, it is gradually heated, and is set by the control device 120 described later at the outlet of the water refrigerant heat exchanger 2. The temperature is raised to a predetermined temperature.

The water supply circuit 91 includes a water supply bracket 11 for receiving a constant from the outside, a pressure reducing valve 12 for adjusting the received constant to an appropriate water pressure, a water supply flow rate sensor 13 for measuring a water supply amount, and how much the water supply is. Water refrigerant heat exchanger flow rate sensor 15 which measures whether it flows in the water refrigerant heat exchanger 2, and the check valve 14 for preventing water from flowing back from the water refrigerant heat exchanger 2 side to the water supply bracket 11 side. ) The water supply heat exchanger 11 is connected to the water side heat transfer pipe 2b of the water refrigerant heat exchanger 2 by a water pipe.

The hot water supply circuit 92 has a water pipe path from the water side heat transfer pipe 2b of the water refrigerant heat exchanger 2 to the hot water supply bracket 19 connected to the hot water supply pipe outside the heat pump hot water supply device 100, and each member. Include. Between the water-cooling heat exchanger 2 and the hot water supply bracket 19, the water storage tank 21 which stores the hot water heated by the water side heat exchanger tube 2b, and the hot water and water storage tank 21 heated by the water side heat exchanger tube 2b. 2nd hot water mixture used to mix the water supplied from the water supply circuit 91 with the 1st hot water mixing valve 16 used for mixing the hot water collected in the step 1), and the hot water passing through the first hot water mixing valve 16. The valve 17 and the flow regulating valve 18 which adjusts the flow volume of the hot water which passed the 2nd hot water mixing valve 17 are arrange | positioned.

In addition, the switching valve 40 is provided between the water side heat transfer pipe 2b of the water refrigerant heat exchanger 2 and the first hot water mixing valve 16, and is also connected to the intermediate portion 21b of the water storage tank 21. It is possible. In addition, the upper part 21a of the water storage tank 21 is connected with the 1st hot water mixing valve 16, and the lower part 21c of the water storage tank 21 is connected with the water supply circuit 91. FIG.

The switching valve 40 is a three-way valve. The switching valve 40 connects only the water side heat exchanger tube 2b of the water refrigerant heat exchanger 2 and the 1st hot water mixing valve 16, and the water side heat exchanger tube 2b of the water refrigerant heat exchanger 2 and the water storage tank ( Switching only the intermediate part 21b of the water storage tank 21 and only the 1st hot water mixing valve 16 which communicates only the intermediate part 21b of 21 is switched.

The case where the switching valve 40 is switched and only the water-side heat exchanger tube 2b of the water refrigerant heat exchanger 2 and the 1st hot water mixing valve 16 will be described is demonstrated. In the first hot water mixing valve 16, hot water heated in the water-side heat transfer pipe 2b and hot water collected in the upper portion 21a of the water storage tank 21 are mixed. As a result, a hot water supply circuit is formed.

The water storage tank 21 stores the hot water previously heated by the water refrigerant heat exchanger 2 of the tank reheating circuit 96. By the command of the control apparatus 120, the hot water of about 60-90 degreeC stored in the water storage tank 21 is mixed with the hot water supplied from the water refrigerant heat exchanger 2, The 1st hot water mixing valve ( 16). Specifically, the hot water of predetermined temperature set by the control apparatus 120 is supplied from the 1st hot water mixing valve 16 until the hot water heated by the water refrigerant heat exchanger 2 is heated up to predetermined temperature. .

In addition, when the user's desired temperature or hot water supply amount (hot water load) exceeds the heating capacity of the heat pump refrigerant circuit 90, the water is immersed in the hot water which does not reach the desired temperature supplied from the water refrigerant heat exchanger 2. The hot water stored in the tank 21 is always mixed. And the hot water of predetermined temperature determined by the control apparatus 120 is supplied to a user.

When the switching valve 40 is switched and the water side heat transfer pipe 2b of the water refrigerant heat exchanger 2 only communicates with the intermediate portion 21b of the water storage tank 21, the tank reheating circuit 96 is formed. The tank reheating circuit 96 is mentioned later. When the switching valve 40 is switched and the intermediate part 21b of the water storage tank 21 is communicated only with the 1st hot water mixing valve 16, the hot water supply circuit 92 is formed. At this time, in the first hot water mixing valve 16, the hot water of the hot water collected in the middle portion 21b of the water storage tank 21 and the hot water of the hot water collected in the upper portion 21a of the water storage tank 21 are mixed.

One inlet port of the second hot water mixing valve 17 is connected to the water pipe passage 17b. The water pipe passage 17b branches off from the water supply circuit 91. In the 2nd hot water mixing valve 17, the hot water mixed by the 1st hot water mixing valve 16 and the water supplied from the water supply circuit 91 are mixed by the command of the control apparatus 120. FIG. The control device 120 supplies the hot water having the set hot water temperature (about 35 to 60 ° C.) from the hot water supply bracket 19 with the first hot water mixing valve 16 and the second hot water mixing valve 17. To control the opening and closing.

The bath water filling circuit 93 branches off from the conduit 19a connecting the flow rate adjusting valve 18 and the hot water supply fitting 19 of the hot water supply circuit 92. The bath water filling circuit 93 includes from the branching portion 19a to the tapping water fitting 35 for supplying hot water to the bath 36. In the piping of the bath water filling circuit 93, the pouring solenoid valve 31, the flow switch 32, the bath water circulation pump 33, and the water level sensor 34 are sequentially arranged.

The pouring solenoid valve 31 is used to guide hot water from the branch part 19a to the bathtub 36 side. The flow switch 32 detects the flow of the bath in the bath water filling circuit 93. The bath water circulation pump 33 is used to feed the hot water of the bath 36 to the bath water reboiling heat exchanger 29 when it boils again. The water level sensor 34 detects the water level of the hot water poured into the bathtub 36. The hot water supply fitting 35 and the bath water circulation adapter 36a attached to the bath 36 are connected by a water pipe passage 36b.

The bath water reboiling heating circuit 94 is a circuit for reheating the hot water of the bath 36, and has a bath water reboiling heat exchanger 29. The in-flight circulation pump 23 is connected to the outlet side of the secondary refrigerant | coolant side heat exchanger tube 29a of the bath water reboiling heat exchanger 29. The in-flight circulation pump 23 heats the water in the water pipe passage 29c and supplies it to the water side heat transfer pipe 2b of the water refrigerant heat exchanger 2. In the water side heat transfer pipe 2b, water is heated. The heated water (high temperature water) communicates with the boiling boiling valve 27 and the check valve 28 installed in the pipe 27b branched from the hot water supply circuit 92. Here, while the bath water boil heating circuit 94 is in operation, the boil solenoid valve 27 is in the open state again.

The hot water passing through the check valve 28 flows into the secondary coolant side heat transfer pipe 29a of the bath water boil again heat exchanger 29. In the bath water reboiling heat exchanger 29, the flow of the hot water in the secondary refrigerant side heat exchanger tube 29a and the flow of the hot water in the bath water side heat transfer tube 29b form a counter flow. The hot water heat-exchanged with the hot water in the bathtub water side heat transfer pipe 29b becomes low temperature water, and flows into the in-flight circulation pump 23. Thereafter, the low temperature water is returned to the water refrigerant heat exchanger 2 from the water pipe passage 14b connected to the downstream side of the check valve 14 of the water supply circuit 91. Thereafter, the water circulates in the bath water boil heating circuit 94 while the bath water is again boiled.

Bath water re-boiling endothermic circuit 95 is a circuit for heating the hot water in the bath 36, the bath water from the bath water circulation adapter (36a) installed in the bath 36 through the hot water tap fitting (35) Guide to the boil heat exchanger (29). Bath water taken out from the bath 36 is guided to the bath water circulation pump 33 via the water level sensor 34. The bath water circulation pump 33 pressurizes the bath water and supplies the bath water back to the boil heat exchanger 29 through the flow switch 32. At this time, the pouring solenoid valve 31 provided in the bath water filling circuit 93 is closed, and the bath water is guided to the bath water boil again heat exchanger 29. The bath water is heated when passing the bath water side heat transfer pipe 29b of the bath water boil heat exchanger 29 again, and is returned to the bath water circulation adapter 36a through the tap water fitting 35.

The tank reheating circuit 96 is a circuit for guiding the hot water heated by the water refrigerant heat exchanger 2 to the water storage tank 21. A case where the switching valve 40 is switched to communicate the water side heat transfer pipe 2b of the water refrigerant heat exchanger 2 only with the first hot water mixing valve 16 will be described. At this time, the tank reheating circuit 96 includes a storage tank 21, an in-flight circulation pump 23 for supplying water to the storage tank, a switching valve 40, and a first hot water mixing valve 16. . When operating the tank reheating circuit 96, the boiling solenoid valve 27 which the bath water reboiling heating circuit 94 has is closed again.

In the first hot water mixing valve 16, the water refrigerant heat exchanger 2 side and the water storage tank 21 side communicate with each other. In the second hot water mixing valve 17, the first hot water mixing valve 16 and the water supply side are blocked. In this state, the in-flight circulation pump 23 is operated to supply water in the storage tank 21 to the water refrigerant heat exchanger 2 from the bottom of the storage tank 21. In the water refrigerant heat exchanger (2), the water in the boiling water tank 21 is heated with hot water of about 60 to 90 캜. The heated hot water is returned to the upper portion of the water storage tank 21 via the first hot water mixing valve 16.

Moreover, when raising the heat pump refrigerant circuit 90, etc., the heating capability of the heat pump refrigerant circuit 90 is not enough. Thus, the preheating operation is performed by using the bath water boil heating circuit 94 until the water refrigerant heat exchanger 2 heats the water at a predetermined temperature. Specifically, the boiling solenoid valve 27 is opened again, and the water coolant heat exchanger 2 side and the storage tank 21 of the first hot water mixing valve 16 are shut off. The first hot water mixing valve 16 and the water supply side of the second hot water mixing valve 17 are also blocked. In this state, the in-flight circulation pump 23 is operated to allow water to circulate between the water refrigerant heat exchanger 2 and the bath water reboiling heat exchanger 29.

A case where the switching valve 40 is switched to communicate the water side heat transfer pipe 2b of the water refrigerant heat exchanger 2 only with the intermediate portion 21b of the water storage tank 21 will be described below. In this case, the tank reheating circuit 96 includes a storage tank 21, an in-flight circulation pump 23 for supplying water to the storage tank, and a switching valve 40. When operating the tank reheating circuit 96, the boiling solenoid valve 27 which the bath water reboiling heating circuit 94 has is closed again.

The first hot water mixing valve 16 cuts off the water storage tank 21 side and the second hot water mixing valve 17 side. In this state, the in-flight circulation pump 23 is operated to supply water in the storage tank 21 to the water refrigerant heat exchanger 2 from the lower portion 21c of the storage tank 21. In the water refrigerant heat exchanger (2), the water in the boiling water tank (21) is heated with warm water below 60 ° C, for example, about 40 ° C. The intermediate temperature water is returned to the intermediate portion 21b of the storage tank 21 via the switching valve 40.

In addition, storing hot water in the middle part 21b of the water storage tank 21 is as follows. When the hot water from the hot water supply bracket 19 of the hot water supply circuit 92 is stopped for a time shorter than a predetermined time when the hot water pump refrigerant circuit 90 is operated and hot water is supplied, the heat pump refrigerant circuit 90 is not stopped. The water supply destination of the hot water heated by the water refrigerant heat exchanger 2 is changed from the hot water supply bracket 19 to the water storage tank 21. Then, the hot water heated in the storage tank 21 is heated, and the operation time of the heat pump refrigerant circuit 90 is extended. This shortens the use time in a state where energy efficiency is low so that the operation is stopped in the elevated state of the heat pump refrigerant circuit 90.

For example, when hot water at 42 ° C. is hot water from the hot water supply bracket 19, when the hot water is heated in the hot water tank 21 in this temperature state (mid temperature water), the hot water position of the hot water tank 21 is changed to the middle portion 21b. ) When it is determined that the amount of residual water in the storage tank 21 is small, the water refrigerant heat exchanger 2 is heated with a temperature higher than the temperature of the hot water supply fitting 19, for example, 60 to 90 ° C. And it melts on the upper part 21a of the storage tank 21. In this way, the heating temperature of the water-cooled heat exchanger 2 of the water to be supplied is set in accordance with the amount of remaining water in the storage tank 21, and the storage port of the storage tank 21 is selected according to the set heating temperature, It is desirable to.

The switching operation using the control device 120 at the time of operating each said circuit is demonstrated below. The control apparatus 120 drives / stops the heat pump refrigerant circuit 90. In addition, the rotational speed of the compressor 1 and the opening degree of the expansion valve 3 are controlled. The control signal CS is also outputted and controlled to water-related devices such as the hot water mixing valves 16 and 17 and the flow rate adjusting valve 18 of the hot water supply circuit 92. In addition, the heat pump hot water supply device 100 shown in the present embodiment has a compressor discharge pressure sensor 51 on the discharge side of the compressor 1 of the heat pump refrigerant circuit 90. Moreover, the heat pump hot water supply apparatus 100 has many temperature sensors, These are connected to the control apparatus 120, although illustration is abbreviate | omitted.

In the heat pump refrigerant circuit 90, the compressor discharge temperature sensor 50 is disposed on the discharge side of the compressor 1, the evaporator refrigerant inlet temperature sensor 52 is disposed on the refrigerant inlet side of the evaporator 4, and the evaporator refrigerant outlet temperature is provided on the refrigerant outlet side. The sensor 53 is provided with an outside air temperature sensor 54 in the vicinity of the evaporator 4, respectively. In the water supply circuit 91, the water supply temperature sensor 60 near the water supply bracket 11 is located in the water supply line and upstream than the water inlet side of the water refrigerant heat exchanger 2 as the water supply line. 61 are provided, respectively.

In the hot water supply circuit 92, the water refrigerant heat exchanger water outlet temperature sensor 62 is downstream from the water outlet side of the water refrigerant heat exchanger 2, and the first hot water mixing valve 16 and the second hot water mixing valve 17 are used. The hot water supply temperature sensor 64 is installed in the hot water supply line between the hot water supply line between the hot water supply line and the hot water supply line downstream of the second hot water mixing valve 17. In the water storage tank 21, the position changes to a height direction, and several tank temperature sensors 65a-65c are provided.

Thus, in the heat-pump hot water supply apparatus 100 which arrange | positioned various sensors, the user's desired hot water temperature Tws is set using the remote control not shown in the house. The control apparatus 120 controls each said valve etc. so that hot water of desired temperature may be heated from a hot water supply facility based on the set desired hot water temperature Tws. That is, the control apparatus 120 sets the target temperature of the hot water supply temperature sensor 64 installed downstream of the 2nd hot water mixing valve 17 to the temperature (Tws + alpha) higher by (alpha) 0 than the preset hot water supply temperature. The target temperature of the mixing temperature sensor 63 provided between the first hot water mixing valve 16 and the second hot water mixing valve 17 is set to a temperature Tws + α0 + α1 higher by α1 than this temperature. do. The target temperature of the water refrigerant heat exchanger water outlet temperature sensor 62 is set to a temperature Tws + α0 + α1 + α2 higher by α2.

In the present embodiment, in consideration of the heat radiation in the water pipe passage, the target temperature is set higher as it becomes upstream of the hot water supply circuit 92 and the closer to the water refrigerant heat exchanger 2. Even if the outlet temperature of the water-side heat exchanger tube 2b of the water refrigerant heat exchanger 2 and the mixing temperature of the hot water which flowed out from the 1st hot water mixing valve 16 fluctuate | varied somewhat by disturbance etc., it is a temperature higher than desired hot water temperature. Since the amount of water to be mixed with the hot water flowing into the second hot water mixing valve 17 is controlled so as to be at the set temperature, the temperature can be adjusted to a desired temperature. As a result, hot water supply with little temperature fluctuation can be realized.

The target of the water refrigerant heat exchanger water outlet temperature sensor 62 when the switching valve 40 is switched and the water is heated from the upper portion 21a of the water storage tank 21 during the operation of operating the tank reheating circuit 96. Temperature is changed in 60-90 degreeC which is the temperature of high temperature water according to conditions, such as season and the usage amount of hot water. In the case of switching the switching valve 40 and pouring water from the middle portion 21b of the water storage tank 21, the target temperature of the water refrigerant heat exchanger water outlet temperature sensor 62 is, for example, about 40 ° C. Set to medium temperature hot water.

Setting the temperature to the warm hot water is when the hot water is supplied by driving the heat pump refrigerant circuit 90, and the hot water supply from the hot water supply bracket 19 of the hot water supply circuit 92 is shorter than a predetermined time. In this case, the hot water destination of the hot water heated by the water refrigerant heat exchanger 2 is changed from the hot water supply bracket 19 to the water storage tank 21 without stopping the heat pump refrigerant circuit 90. The target temperature of the water refrigerant heat exchanger water outlet temperature sensor 62 is set to a temperature approximately equal to that of the medium temperature hot water supplied from the hot water supply bracket 19 without significantly changing the target temperature. Since hot water is agitated, it is possible to save energy required for heating to raise the temperature from medium temperature (for example, 40 ° C) to high temperature (for example, 60 ° C).

When operating the heat pump refrigerant circuit 90, the compressor 1 controls the rotation speed. Since the heat capacity of the refrigerant circulation system including the water refrigerant heat exchanger 2 is large, even if the rotational speed of the compressor 1 is changed, the water outlet temperature of the water refrigerant heat exchanger 2 does not change immediately. That is, the response speed of the water outlet temperature is slow. Therefore, as a characteristic related to the water outlet temperature of the water refrigerant heat exchanger 2, the discharge pressure of the compressor 1 with a quick response speed is used for a control target. In the low temperature type heat pump hot water supply device, hot water having a desired temperature can be supplied at an instant, but in the instantaneous heat pump hot water supply device 100, the supply timing depends on the rising characteristic of the heat pump refrigerant circuit 90.

Hereinafter, a method of improving the rising characteristic of the instantaneous heat pump hot water supply device 100 will be described. The discharge pressure of the compressor 1 is so high that the water outlet temperature of the water refrigerant heat exchanger 2 is high. The target discharge pressure Pd0 is a function of the water outlet temperature target value Twh (= Tws + α0 + α1 + α2) of the water refrigerant heat exchanger 2, and is represented by (Equation 1).

Pd0 = f (Twh)... (Equation 1)

The rotational speed of the compressor 1 is controlled so that the deviation (ΔEpd (= Pd0-Pd)) between the target discharge pressure Pd0 and the actual discharge pressure Pd becomes zero. At this time, for example, the rotational speed of the compressor 1 is increased or decreased as a function of the deviation? Epd and the deviation? Epd-the previous deviation? Epd.

Even if the flow rate of the water flowing through the heat pump refrigerant circuit 90 changes and the actual discharge pressure Pd reaches the target discharge pressure Pd0, the water outlet temperature of the water refrigerant heat exchanger 2 deviates from the target value. It is also expected. The target discharge pressure Pd0 is corrected from time to time so that the water outlet temperature of the water refrigerant heat exchanger 2 approaches the target value.

That is, since the desired flow rate is determined by the opening degree of the faucet etc. on the user side, and the desired hot water supply temperature Tws is set from the remote controller, the water outlet temperature of the water refrigerant heat exchanger 2 is based on these set temperatures and use flow rates. The control device 120 controls the rotational speed of the compressor 1 so as to reach the target value Twh. Moreover, overheating is also controlled by the opening degree of the expansion valve 3. Specifically, the opening degree of the expansion valve 3 is controlled so that the superheat degree, which is the temperature difference between the refrigerant outlet temperature and the refrigerant inlet temperature of the evaporator 4, becomes a predetermined value.

Hereinafter, the operation of the heat pump hot water supply device 100 during a series of operations from the hot water supply start to the stop will be described. When the use time of the hot water in the hot water supply terminal connected to the hot water supply bracket 19, the pouring solenoid valve 31, the bath bracket 37, or the like is about tens of seconds, the compressor 1 is not started. Instead, the hot water is supplied from the hot water tank 21 to the hot water supply terminal.

3 shows how the heat pump refrigerant circuit 90 operates / stops when the hot water supply terminal is opened and closed in a timing chart. 3A illustrates a case where the hot water supply terminal is closed after 180 seconds or more elapse from the start of operation of the heat pump refrigerant circuit 90, and FIG. 3B illustrates a heat pump refrigerant circuit ( From the start of the operation of 90), for example, before 180 seconds have elapsed, the hot water supply terminal is closed. In order to prevent performance deterioration due to frequent operation / stop of the compressor 1, the compressor 1 is not operated for a predetermined time even when the hot water supply terminal is opened. When the compressor 1 starts up and the heat pump refrigerant circuit 90 starts up, in all cases, the heat pump refrigerant circuit 90 continues until a predetermined time e.g. 180 seconds has elapsed since the hot water supply terminal was closed. Drive by

More details will be described below. When the water tap which is not shown connected to the hot water supply bracket 19 is opened, the constant flowed in from the water supply bracket 11 by the water pressure is reduced in pressure reducing valve 12, water supply flow rate sensor 13, check valve 14, Water refrigerant heat exchanger flow sensor 15, water refrigerant heat exchanger (2), switching valve 40, the first hot water mixing valve 16, the second hot water mixing valve 17, the flow control valve 18, hot water supply It flows through the bracket 19 sequentially and flows out from a tap. In addition, the switching valve 40 is switched so that the water refrigerant exchanger 2 and the first hot water mixing valve 16 communicate with each other. At this time, after the water supply flow rate sensor 13 installed in the hot water supply line detects the water flow, the compressor 1 of the heat pump refrigerant circuit 90 is not started for, for example, 30 seconds. The length of the detection time of the feed water flow rate sensor 13 is measured by a timer (not shown) included in the control device 120. The timer may be provided in the feed water flow rate sensor 13.

In order to supply hot water from the hot water tank 21 to a hot water supply terminal, according to the relationship between the target temperature of the mixing temperature sensor 63 and the temperature of the intermediate tank temperature sensor 65b of the hot water tank 21, two types of supply are supplied. There is a way. 4 is a system diagram of a heat pump hot water supply device similar to that shown in FIG. In FIG. 4, the water flow formed when hot water is mixed with the hot water stored in the upper portion 21a of the water storage tank 21 and the hot water is stored in the middle portion 21b of the water storage tank 21 for hot water supply. The furnace is shown by the thick solid line. This is a case where the target temperature of the mixing temperature sensor 63 is higher than the temperature of the middle tank temperature sensor 65b of the water storage tank 21.

That is, the target temperature of the mixing temperature sensor 63 for hot water supply to the hot water supply terminal is lower than the hot water of 60 to 90 ° C. of the upper portion 21a of the hot water tank 21. Therefore, if the hot water temperature of the middle part 21b of the water storage tank 21 is lower than the target temperature of the mixing temperature sensor 63, the hot water and middle part 21b of the upper part 21a of the water storage tank 21 will be described. By mixing the hot and cold water properly, the hot and cold water of the target temperature of the mixing temperature sensor 63 can be produced. At this time, the switching valve 40 is switched so that the intermediate part 21b of the water storage tank 21 and the 1st hot water mixing valve 16 may communicate.

There are two types of sources of warm hot water stored in the storage tank 21. One is hot water in which the temperature dropped by heat dissipation after being poured into the water storage tank 21 at a high temperature. Another case is the case where the hot water is supplied from the hot water supply bracket 19 of the hot water supply circuit 92 only for a short time when the hot water is driven by the heat pump refrigerant circuit 90. In this latter case, the destination of the hot water heated by the water refrigerant heat exchanger 2 is changed from the hot water supply bracket 19 to the water storage tank 21 without stopping the heat pump refrigerant circuit 90.

In this state, these intermediate temperature waters are low as hot water supply water, and cannot be used as hot water supply water. However, when mixed with hot water, it can be effectively used. In other words, after the heat pump refrigerant circuit 90 generates, the heat amount of the water having a low temperature for a certain reason can be effectively used up. In addition, since the amount of mesophilic water in the boiling water tank 21 was reduced, the water inlet temperature of the water refrigerant heat exchanger 2 can be reduced at the time of tank reheating, and COP in tank reheating improves. This is because if the reheating temperature is the same, the lower the acquisition temperature of the water refrigerant heat exchanger 2, the higher the COP.

The control apparatus 120 controls the opening degree of the 1st hot water mixing valve 16 so that the temperature of the mixing temperature sensor 63 may become target temperature (Tws + (alpha) ++ alpha] 1). Then, in the first hot water mixing valve 16, the hot water of the upper portion 21a of the water storage tank 21 and the middle temperature water of the middle portion 21b are mixed. Moreover, the control apparatus 120 controls the quantity of water mixed by the downstream 2nd hot water mixing valve 17 so that the temperature of the hot water supply temperature sensor 64 may become target temperature Tws + (alpha). The mixing amount of hot water is adjusted by the 2nd hot water mixing valve 17, and hot water is supplied to the tap.

FIG. 5 shows a system diagram of a heat pump hot water supply device 100 similar to FIG. 1. In FIG. 5, the connection relationship between the control apparatus 120, each sensor, and the control apparatus 120 is abbreviate | omitted. About these, it is the same as that of the Example of FIG. The thick water line in which hot water and hot water stored in the upper portion 21a of the water storage tank 21 and the water supply that mixes and feeds the water supplied through the water-side heat transfer pipe 2b of the water refrigerant heat exchanger 2 is indicated by a thick solid line. This figure corresponds to the case where the target temperature of the mixing temperature sensor 63 is equal to or less than the temperature of the middle tank temperature sensor 65b of the water storage tank 21. The switching valve 40 is switched so that the water side heat exchanger tube 2b of the water refrigerant heat exchanger 2 and the 1st hot water mixing valve 16 may communicate.

The control apparatus 120 controls the opening degree of the 1st hot water mixing valve 16 so that the temperature of the mixing temperature sensor 63 may become target temperature (Tws + (alpha) ++ alpha] 1). And the hot water of the upper part 21a of the water storage tank 21 and the unheated water which flowed out from the water refrigerant heat exchanger 2 are mixed by the 1st hot water mixing valve 16. FIG. Moreover, the control apparatus 120 controls the quantity of water mixed by the downstream 2nd hot water mixing valve 17 so that the temperature of the hot water supply temperature sensor 64 may become target temperature Tws + (alpha). The mixing amount of hot water is adjusted by the 2nd hot water mixing valve 17, and hot water is supplied to the tap.

In the present embodiment, if the use of the hot water supply terminal such as the tap is within 30 seconds, the compressor 1 is not started. Only the water in the water storage tank 21 made by the water storage operation using the tank reheating circuit 96 is used. Therefore, when water flow is detected, the use time of the compressor 1 becomes short compared with the conventional method of starting the compressor 1. At the same time, frequent starting / stopping of the compressor 1 can be prevented. When there is no hot water demand, the heat pump refrigerant circuit 90 and the in-flight circulation pump 23 are operated to store the generated hot water in the hot water tank 21. At this time, the water in the water storage tank 21 circulates through the water path in the order of the in-flight circulation pump 23, the water refrigerant heat exchanger 2, and the first hot water mixing valve 16.

In this embodiment, a predetermined time from the start of hot water supply is used as an operation start condition of the heat pump refrigerant circuit 90. However, for example, when the amount of hot water supply is large and the amount of residual water in the water storage tank 21 is equal to or less than the predetermined amount or the temperature of the temperature sensor is equal to or less than the predetermined value, the heat pump refrigerant circuit ( You may make it quicker to start operation of 90).

When the hot water is continuously used for 30 seconds or more from the hot water supply terminal, the heat pump refrigerant circuit 90 is operated. That is, after 30 seconds have passed since the water supply flow rate sensor 13 detects the water flow, the compressor 1 is started. The water path at this time is the same as the path shown in FIG. The switching valve 40 is switched to communicate the water-side heat transfer pipe 2b of the water refrigerant heat exchanger 2 with the first hot water mixing valve 16.

The hot water supplied from the heat pump refrigerant circuit 90 does not reach the predetermined target temperature set by the control device 120 until the heat pump refrigerant circuit 90 rises. Therefore, the hot water heated by the water refrigerant heat exchanger 2 and the hot water stored at the storage tank 21, for example, about 60 ° C are mixed. The opening degree of the 1st hot water mixing valve 16 is adjusted so that the temperature which the mixing temperature sensor 63 detects may become predetermined | prescribed target temperature.

When the compressor 1 is started, the heating capacity of the heat pump refrigerant circuit 90 gradually increases as time passes. As a result, in the 1st hot water mixing valve 16, the flow volume on the water refrigerant heat exchanger 2 side gradually increases, and the flow volume on the water storage tank 21 side gradually decreases. When the temperature and tapping amount desired by the user are equal to or lower than the heating capacity of the heat pump refrigerant circuit 90, when the temperature on the water refrigerant heat exchanger 2 side reaches a predetermined temperature, the supply of hot water from the storage tank 21 side is supplied. Is stopped, and hot water is continuously supplied only from the heat pump refrigerant circuit 90 side.

On the other hand, when the temperature and tapping quantity desired by the user exceed the heating capability of the heat pump refrigerant circuit 90, the hot water which does not reach the predetermined temperature is supplied from the water refrigerant heat exchanger 2. The hot water stored in the water storage tank 21 is mixed with the hot water which does not reach this predetermined temperature, and the hot water of the temperature and tapping quantity which a user desires is supplied from a hot water supply terminal. When the hot water stored in the water storage tank 21 disappears, the flow rate adjusting valve 18 squeezes the flow rate to the flow rate which can be supplied by the heating capacity of the heat pump refrigerant circuit 90 without changing the hot water temperature. In this state, the hot water is continuously heated from the heat pump refrigerant circuit 90 to the hot water supply terminal.

When the water supply flow rate sensor 13 detects that the hot water supply terminal is closed, the operation of the heat pump hot water supply device 100 is different as shown in FIG. 3 at an elapsed time from the start of operation of the heat pump refrigerant circuit 90. . When 180 seconds or more have elapsed since the start of the operation of the heat pump refrigerant circuit 90, when the hot water detected by the temperature sensors 65a to 65c of the water storage tank 21 is equal to or larger than a set value, the control device 120 (not shown) Determines that the amount of residual water is large, the compressor 1 is stopped.

When the hot water detected by the temperature sensors 65a to 65c of the storage tank 21 does not reach the set value, it is determined that the amount of residual water is small and the reheating operation is performed using the reheating circuit 96. The water path in the water storage operation at this time is shown by a thick line in FIG. The hot water of about 60-90 degreeC is stirred from the upper part 21a of the storage tank 21. 6, the connection relationship between a control apparatus, a control apparatus, and each sensor is abbreviate | omitted. These are the same as that of the Example shown in FIG.

When 180 seconds have not elapsed since the start of the operation of the heat pump refrigerant circuit 90, the hot water tank for supplying hot water heated by the water refrigerant heat exchanger 2 is stopped from the hot water supply terminal without stopping the heat pump refrigerant circuit 90. Change to (21). By boiling in the water storage tank 21, the operation time of the heat pump refrigerant circuit 90 can be extended. At this time, when the hot water detected by the temperature sensors 65a to 65c of the water storage tank 21 is less than the set value, it is determined that the amount of residual water is small. And similarly to the example shown in FIG. 6, the hot water of about 60-90 degreeC is water-stored from the upper part 21a of the water storage tank 21. As shown in FIG. When the hot water is stored in the water storage tank 21 to a predetermined height, the heat pump refrigerant circuit 90 is stopped.

In other cases, a water path shown in Fig. 7 by a thick line is formed. In this case, middle temperature water is stored from the intermediate part 21b of the storage tank 21. The target temperature of the water refrigerant heat exchanger water outlet temperature sensor 62 is not significantly changed. The temperature which is about the same as the hot water of medium temperature (for example, 42 degreeC) to a hot water supply terminal is set. That is, according to the tapping temperature of the heat pump refrigerant circuit 90, the tapping is performed at an appropriate position of the boiling tank 21. When a predetermined time has elapsed since the switching to the water storage tank 21 is switched, or when the water is stored in the water storage tank 21 to a predetermined height, the heat pump refrigerant circuit 90 is stopped.

According to the present embodiment, it is possible to avoid the low energy efficiency operation and the short time operation that the heat pump water heater is operated by stopping only in an elevated state. In the present embodiment, the compressor 1 is started 30 seconds after the water supply flow sensor 13 detects that the hot water supply terminal is opened. However, the user may change the start time of the compressor for each user. In addition, you may change this time to a use time zone. In addition, by using the learning control, the hot water supply pattern of the user may be learned, and the start time of the compressor may be determined by statistically analyzing the case where the hot water supply time is short and long.

In the present embodiment, the case of having one storage tank 21 has been described. However, even when a plurality of storage tanks are connected in series, similar effects can be obtained by following the same procedure. In this case, it is good to provide the switching valve 40 in the piping part which connects several water storage tanks in series.

In addition, the heat pump hot water supply device 100 shown in FIG. 1 also has a bath water automatic filling function. When the user sets the bath water temperature to, for example, 42 ° C. by using a remote control (not shown), and turns on the automatic bath water filling button (not shown), the pouring solenoid valve 31 of the bath water filling circuit 93 opens. . At this time, the water flowing from the water supply bracket 11 by the water pressure is reduced in pressure reducing valve 12, water supply flow sensor 13, check valve 14, water refrigerant heat exchanger flow rate sensor 15, water refrigerant heat exchange 2, the first hot water mixing valve 16, the second hot water mixing valve 17, the flow control valve 18, the pouring solenoid valve 31, the flow switch 32, the bath water circulation pump 33, It is heated and supplied to the bath 36 via the water level sensor 34, the tapping water fitting 35, and the bath water circulation adapter 36a.

In automatic bath water filling, the water supply flow rate sensor 13 detects a constant water supply. However, since the bath water automatic filling button is turned ON, when the hot water supply time is long, the control device 120 automatically determines. Thus, the control device 120 starts the compressor 1 of the heat pump refrigerant circuit 90 before 30 seconds have elapsed since the water supply flow rate sensor 13 detects the water quantity.

Here, the control apparatus 120 controls the opening degree of the flow regulating valve 18 so that the flow volume of the feed water flow sensor 13 may become a predetermined value. The temperature of the hot water until the heat pump refrigerant circuit 90 rises is lower than a predetermined target temperature set in the control device 120. Thus, the hot water heated in the water refrigerant heat exchanger 2 and the hot water at about 60 ° C. stored in the water storage tank 21 are mixed by the first hot water mixing valve 16. And the control apparatus 120 controls the mixing amount in the 1st hot water mixing valve 16 so that the temperature which the mixing temperature sensor 63 detects may become a target temperature. In addition, reheating or boiling water of the hot water tank 21 is the same as that after the hot water supply from the said hot water supply terminal. In addition, the control device 120 switches and controls each valve at the start of the heat pump refrigerant circuit 90 in the same manner as the hot water supply from the hot water supply terminal.

When the water level sensor 34 detects that the bath of the bathtub 36 has reached a predetermined level, the control device 120 turns off the pouring solenoid valve 31. The remote control notifies that the bath water filling is completed, such as a melody. At this time, when the hot water temperature of the temperature sensor 65a attached to the water storage tank 21 is less than a preset value, the control apparatus 120 determines that there is little residual water amount. Then, the reheating circuit 96 is used to perform reheating operation. When the hot water temperature of the temperature sensor 65a is equal to or higher than the set value, the control device 120 determines that the amount of residual water is large, and the compressor 1 is stopped.

As described above, according to the present embodiment, since the compressor is started after a predetermined time has passed since the start of the hot water supply, the start of the heat pump refrigerant circuit in the hot water supply for a short time can be avoided, and the energy efficiency is low. Operation time of driving can be reduced. In addition, when the hot water supply to the hot water supply terminal is completed in a time shorter than a predetermined time when hot water is supplied to the hot water supply terminal using the heat pump refrigerant circuit, the operation is carried out to the water storage operation to the water storage tank without stopping the heat pump refrigerant circuit. Short time operation of the heat pump refrigerant circuit can be avoided. Therefore, the energy efficiency of a heat pump hot water supply apparatus improves.

In the above embodiment, the heat pump refrigerant circuit is operated 30 seconds after the hot water supply terminal is opened. If the time is in the range of 10 seconds to 1 minute, frequent starting / stopping of the compressor can be avoided. have. In addition, although the operation is continued for 3 minutes or more after the operation of the heat pump refrigerant circuit, this time may be about 1 to 5 minutes.

1 is a circuit diagram of an embodiment of a heat pump hot water supply apparatus according to the present invention;

FIG. 2 is a circuit diagram of each part of the heat pump hot water supply device shown in FIG.

3 is a diagram illustrating a relationship between opening and closing of a hot water supply terminal and stopping operation of a heat pump refrigerant circuit.

4 is a view for explaining hot water supply operation of the heat pump hot water supply device shown in FIG. 1;

FIG. 5 is a view for explaining hot water supply operation of the heat pump hot water supply device shown in FIG. 1; FIG.

FIG. 6 is a view for explaining water storage operation of the heat pump hot water supply device shown in FIG. 1; FIG.

FIG. 7 is a view for explaining water storage operation of the heat pump hot water supply device shown in FIG. 1. FIG.

<Description of the symbols for the main parts of the drawings>

1: compressor

2: water refrigerant heat exchanger

3: expansion valve

4: evaporator

13: feed water flow sensor

15: water refrigerant heat exchanger flow sensor

16: first hot water mixing valve

17: second hot water mixing valve

18: flow control valve

21: water storage tank

31: pouring solenoid valve

36: Bathtub

40: switching valve

50: discharge temperature sensor

51: discharge pressure sensor

52: evaporator refrigerant inlet temperature sensor

53: Evaporator Refrigerant Outlet Temperature Sensor

61: water refrigerant heat exchanger water inlet temperature sensor

62: water refrigerant heat exchanger water outlet temperature sensor

63: Mixed Temperature Sensor

64: hot water temperature sensor

90: heat pump refrigerant circuit

100: heat pump hot water supply device

120: control unit

Claims (10)

A heat pump refrigerant circuit for heating water, and a boiling water tank for boiling water heated by the heat pump refrigerant circuit, the hot water generated in the heat pump refrigerant circuit and the hot water stored in the hot water tank can be supplied to the hot water supply terminal. A heat pump hot water supply device, comprising: a control device for controlling not to stop the operation of the heat pump refrigerant circuit until a predetermined time elapses after the heat pump refrigerant circuit is operated. The said control apparatus is a time which heats water by operating the said heat pump refrigerant circuit, and continues supplying to a hot water supply terminal as a hot water, The predetermined time has passed after starting operation of this heat pump refrigerant circuit. And before supplying to the hot water supply terminal is stopped, controlling the water heated in the heat pump refrigerant circuit to be heated in the water storage tank without stopping the operation of the heat pump refrigerant circuit. The water storage tank according to claim 2, wherein the water storage tank has outlets of a plurality of water baths, the outlet water outlets are formed at upper and middle portions of the water storage tank, and the controller is a temperature of water heated in the heat pump refrigerant circuit. A heat pump hot water supply device, characterized in that for switching the outlet in accordance with. The hot water refrigerant exchanger according to claim 2, wherein the heat pump refrigerant circuit has a water refrigerant heat exchanger for exchanging heat between the refrigerant and water, and a hot water mixing valve for mixing the hot water heated in the water refrigerant heat exchanger with the hot water in the upper portion of the water storage tank; A switching valve for connecting a water refrigerant heat exchanger and an intermediate part of the hot water mixing valve and the water storage tank, the switching valve includes a switching position for communicating the water refrigerant heat exchanger only with the hot water mixing valve, and the water refrigerant heat exchanger And a switching position for communicating only the middle portion of the water storage tank, and a switching position for communicating the middle portion of the water storage tank only with the hot water mixing valve. The outlet inlet of Claim 1 is provided in the upper part and the middle part of the said storage tank, and the said control apparatus, when supplying only hot water of this storage tank, the outflow inlet formed in the upper part and middle part of a storage tank. Heat pump hot water supply device, characterized in that for supplying the hot water of the storage tank using. 2. The control apparatus according to claim 1, wherein the control device supplies the hot water from the hot water tank when there is a use request of the hot water from the hot water supply terminal, and starts the heat pump refrigerant circuit if the use request continues after a predetermined time elapses. A heat pump hot water supply device characterized by the above-mentioned. The heat pump hot water supply apparatus according to claim 1, wherein the predetermined time is set to 1 to 5 minutes. The heat pump hot water supply apparatus according to claim 6, wherein the predetermined time is set to 10 seconds to 1 minute. 2. The control device according to claim 1, wherein the control device stops the heat pump refrigerant circuit when a predetermined time has elapsed since the switching to the storage tank to the storage tank, or when the level of the water of the storage tank reaches a predetermined position. Heat pump hot water supply device. A heat pump refrigerant circuit for heating water, and a boiling water tank for boiling water heated by the heat pump refrigerant circuit, the hot water generated in the heat pump refrigerant circuit and the hot water stored in the hot water tank can be supplied to the hot water supply terminal. In the heat pump hot water supply apparatus, even if the supply to the hot water supply terminal is stopped, the operation of the heat pump refrigerant circuit is continued until a predetermined time elapses after the heat pump refrigerant circuit is operated, and the temperature equal to the hot water terminal terminal tapping target temperature. A heat pump hot water supply device, characterized in that the hot water is controlled to flow into the intermediate position of the storage tank.

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