JP4301708B2 - Operation method of heat pump type hot water supply apparatus and heat pump type hot water supply apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of operating a heat pump type hot water supply apparatus and a heat pump that can supply hot water by heating water with the refrigerant heat of the refrigerant, and heat (purge) the hot water in the bathtub with the refrigerant heat of the refrigerant. The present invention relates to a water heater.
[0002]
[Prior art]
In a conventional hot water supply apparatus, water can be heated by Joule heat using an electric heater or by combustion heat using a gas combustor, hot water can be stored in a hot water tank, and the hot water can be supplied to a faucet and a bathtub. In addition, there is one that has a function of heating (chasing) hot water in a bathtub with the Joule heat or combustion heat to keep it at an appropriate temperature.
[0003]
In addition, as a hot water supply device, water is heated by the refrigerant heat of the refrigerant, hot water is stored in the hot water supply tank, the hot water can be supplied to the faucet and the bathtub, and the hot water in the bathtub is heated (followed by the refrigerant heat of the refrigerant). A heat pump type hot water supply apparatus having a function of keeping the temperature at a suitable temperature is proposed.
[0004]
[Problems to be solved by the invention]
However, in the conventional hot water supply apparatus as described above, in the reheating operation in which the hot water in the bathtub is repelled by the user's operation of the reheating switch, the hot water temperature in the bathtub is constant from the set temperature of the automatic bath operation. The temperature is controlled to increase to a high temperature (for example, 1 to 2 ° C.). Normally, the user operates the reheating switch when the hot water temperature in the bathtub is lower than the set temperature of the automatic bath operation, but the reheating is not performed by the automatic bath operation.
[0005]
Therefore, if the hot water temperature in the bathtub rises to a temperature that is a certain temperature higher than the set temperature for automatic bath operation when the chasing operation is performed by the user's chasing switch operation, the user in the bath I feel that the hot water in the bathtub is too hot. Moreover, the time required for this chasing operation is also long.
[0006]
An object of the present invention has been made in consideration of the above-described circumstances, and an operation method of a heat pump type hot water supply apparatus and a heat pump type hot water supply apparatus capable of setting the hot water temperature in a bathtub to a desired temperature in a short time. Is to provide.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 comprises a part of a refrigerant circuit comprising a compressor and a heat pump heat exchanger, a hot water tank, a hot water heat exchanger, and a bath heat exchanger, and the hot water heat exchanger. However, the refrigerant circuit is configured to be connectable to a part of the refrigerant circuit, the water is heated by the refrigerant heat, and hot water can be stored in the hot water tank, and the hot water from the hot water tank to the faucet and the bathtub is stored. The bath heat exchanger is connected to a part of the refrigerant circuit to form a refrigerant circuit, and the hot water in the bath can be heated by the refrigerant heat to be kept warm. In the operation method of the heat pump type hot water supply apparatus , when the hot water in the bath is heated and kept warm by the refrigerant heat, when the hot water set temperature is Ts, the hot water temperature becomes (Ts−ΔT) or less. Sometimes heating starts, (Ts + ΔT) In the reheating operation in which the temperature is raised to a predetermined temperature in the vicinity and the hot water in the bathtub is reheated by operating the reheating switch, the hot water temperature in the bathtub is changed to the temperature in the bathtub at the start of the reheating operation. Control is performed such that the temperature is raised by a constant temperature smaller than the above ΔT rather than the hot water temperature.
[0008]
The invention according to claim 2 comprises a part of a refrigerant circuit comprising a compressor and a heat pump heat exchanger, a hot water tank, a hot water heat exchanger, and a bathtub heat exchanger, and the hot water heat exchanger. However, the refrigerant circuit is configured to be connectable to a part of the refrigerant circuit, the water is heated by the refrigerant heat, and hot water can be stored in the hot water tank, and the hot water from the hot water tank to the faucet and the bathtub is stored. The bath heat exchanger is connected to a part of the refrigerant circuit to form a refrigerant circuit, and the hot water in the bath can be heated by the refrigerant heat to be kept warm. In the heat pump hot water supply apparatus, when the hot water in the bath is heated by the refrigerant heat and kept warm, when the set temperature of the hot water is Ts, the hot water is heated when the temperature of the hot water becomes (Ts−ΔT) or less. And start a predetermined value near (Ts + ΔT) In the reheating operation in which the hot water in the bathtub is reheated by operating the reheating switch, the hot water temperature in the bathtub is set higher than the hot water temperature in the bathtub at the start of the reheating operation. Also , the control is performed so as to increase the temperature by a constant temperature smaller than the above ΔT .
[0009]
The invention according to claim 1 or 2 has the following effects.
[0010]
Because the temperature of the hot water in the bathtub is controlled to increase by a constant temperature from the temperature of the hot water in the bathtub at the start of this chasing operation during the chasing operation in which the hot water in the bathtub is chased by the operation of the chasing switch. Compared to the case where the temperature of the hot water in the bathtub is controlled to increase by a fixed temperature from the set temperature of the automatic bath operation, the hot water temperature in the bathtub does not exceed the desired temperature due to the reheating operation. The hot water temperature inside can be set to a desired temperature in a short time.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 shows an embodiment of a heat pump hot water supply apparatus according to the present invention, and is a circuit diagram when hot water is stored by heating water in a hot water supply tank.
[0013]
As shown in FIG. 1, the heat pump hot water supply apparatus 10 includes a heat pump unit 11, a hot water supply unit 12, a faucet 13, a bathtub 14 and a control device 15, and the control device 15 includes the heat pump unit 11 and the hot water supply. The unit 12 is controlled.
[0014]
In the heat pump unit 11, a compressor 16, an accumulator 17, and a heat pump heat exchanger 18 are sequentially arranged in the refrigerant pipe 19 to constitute a part of the refrigerant circuit. The discharge side end of the compressor 16 in the refrigerant pipe 19 is connected to the gas pipe 21 of the inter-unit pipe 20. Further, the end of the refrigerant pipe 19 on the side of the heat pump heat exchanger 18 is connected to the liquid pipe 22 of the inter-unit pipe 20.
[0015]
In the refrigerant pipe 19, the discharge side of the compressor 16 and the heat pump heat exchanger 18 side are connected by a bypass pipe 24 provided with an electromagnetic valve 23, and excessive high pressure of the discharged refrigerant is released. A blower fan 25 is installed in the vicinity of the heat pump heat exchanger 18 to blow air to the heat pump heat exchanger 18.
[0016]
The hot water supply unit 12 includes a hot water supply tank 26, a hot water supply heat exchanger 27, and a bathtub heat exchanger 28.
[0017]
The hot water supply heat exchanger 27 is disposed in the refrigerant pipe 29 provided with the first switching valve 31. The end portion of the refrigerant pipe 29 on the first switching valve 31 side is connected to the gas pipe 21 of the inter-unit pipe 20 via the gas side joint 30. The other end of the refrigerant pipe 29 is connected to the liquid pipe 22 of the inter-unit pipe 20 via the liquid side joint 33. Thus, the hot water supply heat exchanger 27 is connected to a part of the refrigerant circuit of the heat pump unit 11 to form a refrigerant circuit in which the refrigerant circulates as indicated by a thick line L in FIG.
[0018]
The hot water supply heat exchanger 27 and the hot water supply tank 26 are connected in a loop by a hot water supply pipe 36 having a hot water supply circulation pump 34 and a flow rate adjusting valve 35, and a hot water supply circulation shown by a thick line M in FIG. A circuit 52 is configured.
[0019]
A first tap water pipe 38 provided with a pressure reducing check valve 37 is connected to the bottom of the hot water supply tank 26 so that tap water can always be supplied into the hot water supply tank 26. That is, tap water pressure always acts in the hot water supply tank 26. A hot water supply pipe 40 including a hot water electromagnetic valve 39 is connected to the top of the hot water supply tank 26.
[0020]
When the water at the bottom of the hot water supply tank 26 is supplied to the hot water supply heat exchanger 27 by the operation of the hot water supply circulation pump 34, the hot water supply heat exchanger 27 compresses the supplied water into the heat pump unit 11. Heated by the heat of the refrigerant gas discharged from the machine 16. The heated water (hot water) is guided to the top of the hot water supply tank 26 through the flow rate adjusting valve 35, and hot water of about 60 ° C., for example, can be stored in the hot water supply tank 26.
[0021]
An electric heater 41 is disposed in the hot water tank 26. The electric heater 41 raises the temperature of the hot water in the hot water supply tank 26 to, for example, about 80 ° C. The hot water supply pipe 36 is provided with a drain cock 42 upstream of the hot water supply circulation pump 34, so that hot water or water in the hot water supply pipe 36 and the hot water supply tank 26 can be drained through the drain pan 43. . Further, the hot water supply pipe 36 is provided with relief means 44 on the upstream side of the hot water supply tank 26 so that the pressure when the water is heated excessively by the hot water supply heat exchanger 27 can be released.
[0022]
As shown in FIG. 4, the bathtub heat exchanger 28 is disposed in a refrigerant pipe 45 including a second switching valve 32. The end portion of the refrigerant pipe 45 on the second switching valve 32 side is connected to the point A in the vicinity of the gas side joint 30 in the refrigerant pipe 29. The other end of the refrigerant pipe 45 is connected to a point B near the liquid side joint 33 in the refrigerant pipe 29. The second switching valve 32 and the first switching valve 31 are configured such that when one is opened, the other is closed.
[0023]
Therefore, at the time of opening the second switching valve 32, the bathtub heat exchanger 28 is connected to a part of the refrigerant circuit of the heat pump unit 11, and the refrigerant circuit in which the refrigerant circulates as shown by a thick line N in FIG. Is configured.
[0024]
The bathtub heat exchanger 28 and the bathtub 14 are connected in a loop by a first bathtub pipe 51 including a bathtub circulation pump 46, a filter 47, a water level sensor 48, a thermistor 49, and a flow switch 50. A bathtub circulation circuit 53 indicated by a thick line O in FIG. 4 is configured. A bypass pipe 55 that bypasses the bathtub heat exchanger 28 and includes a bypass electromagnetic valve 54 is connected to the first bathtub pipe 51 on the downstream side of the bathtub circulation pump 46.
[0025]
The bathtub heat exchanger 28 is configured to supply hot water in the bathtub 14 by operating the bathtub circulation pump 46 when hot water is supplied to the bathtub 14 as described later. 16 is heated by the heat of the refrigerant gas discharged from 16, and reheating (refreshing operation by automatic bath operation described later, reheating operation by reheating switch 71 operation) is performed to keep the hot water in the bathtub 14 warm. .
[0026]
Here, since the water level sensor 48 communicates with the bathtub 14 via the first bathtub pipe 51, the water level of the hot water (water) in the bathtub 14 is detected. Further, the thermistor 49 detects the hot water temperature and indirectly detects the hot water temperature in the bathtub 14 when hot water is circulating in the bathtub circulation circuit 53. Moreover, the flow switch 50 detects that hot water is circulating in the circulation circuit 53 for bathtubs. Furthermore, the filter 47 filters hot water together with the filter 56 disposed in the bathtub 14.
[0027]
As shown in FIG. 2, the faucet 13 is connected to the hot water supply tank 26 as shown by a thick line P in FIG. 2 by a hot water supply pipe 59 and a hot water supply pipe 40 provided with a mixing control valve 57 and a flow sensor 58. Further, the faucet 13 is also connected to a second tap water pipe 60 having a pressure reducing check valve 61. The flow sensor 58 detects the amount of hot water flowing through the hot water supply pipe 59.
[0028]
Since the tap water pressure is always applied to the hot water supply tank 26 via the first tap water pipe 38, the hot water tap of the faucet 13 is opened to pass through the hot water supply pipe 40 and the hot water supply pipe 59 to enter the hot water supply tank 26. No hot water is supplied to the faucet 13. The hot water from the faucet 13 is mixed with tap water from the second tap water pipe 60 by opening the tap faucet of the faucet 13 and can be supplied from the faucet 13.
[0029]
In addition, the mixing control valve 57 is provided downstream of the pressure reducing check valve 37 of the first tap water pipe 38 through the third tap water pipe 63 provided with the tap water electromagnetic valve 62 as shown by a thick broken line Q in FIG. Connected to the side. Therefore, when the solenoid valve 39 for tap water and the solenoid valve 62 for tap water are opened, hot water from the hot water supply tank 26 and tap water pipe 40 and tap water from the third tap water pipe 63 are controlled by opening control of the mixing control valve 57. And the hot water temperature supplied from the hot water tap of the faucet 13 is adjusted to 42 ° C., for example.
[0030]
As shown in FIG. 3, the second bathtub pipe 68 connects the downstream side of the flow sensor 58 in the hot water supply pipe 59 and between the bathtub circulation pump 46 and the flow switch 50 in the first bathtub pipe 51. In the second bathtub pipe 68, a flow sensor 64, a pouring electromagnetic valve 65, a relief means 66, and a check valve 67 are sequentially arranged from the hot water supply pipe 59 side.
[0031]
Here, the flow sensor 64 detects the amount of hot water flowing through the second bathtub pipe 68. The relief means 66 and the check valve 67 release pressure when excessively heated hot water flows through the second bathtub pipe 68.
[0032]
When the hot water solenoid valve 65 and the bypass solenoid valve 54 are opened while the bathtub circulation pump 46 is stopped, the hot water in the hot water supply tank 26 flows into the hot water supply pipe 40, the hot water supply as shown by the thick line R in FIG. A part of the pipe 59 and the second bathtub pipe 68 flow into the first bathtub pipe 51 and are branched into two branches in the first bathtub pipe 51, one of which is the flow switch 50, the thermistor 49, and the water level. Hot water is poured into the bathtub 14 through the sensor 48 and the filter 47, and the other is poured into the bathtub 14 through the bypass pipe 55. By pouring hot water into the bathtub 14 from two directions in the first bathtub pipe 51, hot water can be stretched in the bathtub 14 in a short time.
[0033]
When the water level sensor 48 detects that an appropriate amount of hot water has been poured into the bathtub 14 from the hot water supply tank 26, the hot water electromagnetic valve 65 and the bypass electromagnetic valve 54 are closed. Thereafter, when the thermistor 49 detects that the hot water temperature in the bathtub 14 has fallen below the appropriate temperature, the bathtub circulation pump 46 is operated, the second switching valve 32 is opened, and the compressor of the heat pump unit 11 is operated. 16 is activated, and the hot water circulating in the bathtub circulation circuit 53 is heated (fired) by the refrigerant heat of the bathtub heat exchanger 28 by the operation of the bathtub circulation pump 46, and the hot water in the bathtub 14 is heated. Keep warm.
[0034]
In this manner, an operation of supplying an appropriate amount of hot water from the hot water supply tank 26 to the bathtub 14, and then heating the hot water in the bathtub 14 to an appropriate temperature by the bathtub heat exchanger 28 (reheating) is performed. This is called automatic bath operation.
[0035]
The control device 15 operates and stops the compressor 16 in the heat pump unit 11 (including capacity control), opens and closes the electromagnetic valve 23, switches between the first switching valve 31 and the second switching valve 32 in the hot water supply unit 12, and for hot water supply. Operation or stop of the circulation pump 34 and the bathtub circulation pump 46, opening and closing of the hot water solenoid valve 39, the bypass electromagnetic valve 54, the tap water electromagnetic valve 62 and the pouring electromagnetic valve 65, the flow rate adjusting valve 35 and the mixing control valve 57 The heat pump unit 11 and the hot water supply unit 12 are controlled by controlling the opening degree, energization to the electric heater 41, and the like.
[0036]
In particular, as shown in FIGS. 1 and 4, the control device 15 inputs a signal from the fully automatic switch 70 when the fully automatic switch 70 installed in the vicinity of the bathtub 14 is operated to Execute automatic operation.
[0037]
In this bathtub automatic operation, as shown in FIG. 5, the control device 15 detects that the hot water temperature in the bathtub 14 is lower than the set temperature Ts by the predetermined temperature ΔT by the thermistor 49 (that is, Ts). -ΔT), the compressor 16 of the heat pump unit 11 is started, the second switching valve 32 is opened, the bathtub circulation pump 46 is operated, and the hot water temperature of the bathtub 14 is raised. In addition, when the thermistor 49 detects that the hot water temperature in the bathtub 14 is higher than the set temperature Ts by the predetermined temperature ΔT (that is, Ts + ΔT), the control device 15 causes the compressor 16 and the bathtub circulation pump 46 to operate. And the second switching valve 32 is closed. Thus, the control device 15 controls the hot water temperature in the bathtub 14 within the range of (set temperature Ts ± predetermined temperature ΔT) in the bathtub automatic operation.
[0038]
Further, as shown in FIGS. 1 and 4, the control device 15 inputs a signal from the reheating switch 71 when the reheating switch 71 installed near the bathtub 14 is operated together with the fully automatic switch 70. Then, the compressor 16 of the heat pump unit 11 is started, the second switching valve 32 of the hot water supply unit 12 is opened, the bathtub circulation pump 46 is operated, and the hot water (or hot water) in the bathtub 14 is heated to the bathtub. A reheating operation is performed by operating the reheating switch 71, which is led to the exchanger 28 and heats (repels) the hot water in the bathtub 14 by the refrigerant heat of the refrigerant.
[0039]
As shown in FIG. 5, the controller 15 changes the hot water temperature in the bathtub 14 at the start of the reheating operation by the operation of the reheating switch 71 (that is, the reheating operation by the operation of the reheating switch 71). Control is performed so as to set the temperature (Ta + α) higher by a certain temperature α (for example, 1 to 2 ° C.) than the current temperature Ta in the bathtub 14 detected by the thermistor 49 at the time when the reheating switch 71 is operated. To do. This temperature setting is executed by the control device 15 by one operation of the reheating switch 71.
[0040]
Usually, when the reheating switch 71 is operated by a user in the bathtub 14, the temperature of the hot water in the bathtub 14 is lower than the set temperature Ts of the automatic bath operation, but the temperature is not reheated by the automatic bath operation, That is, the temperature in the bathtub 14 is in the range of {(Ts−ΔT) to Ts}. Therefore, the hot water temperature in the range of {(Ts−ΔT) to Ts} is in the vicinity of the set temperature Ts set as an appropriate temperature by the user by the reheating operation by one operation of the reheating switch 71 as described above. Will be raised to.
[0041]
Moreover, the time required from the time point ta when the reheating switch 71 is operated to the time point t1 when the hot water temperature in the bathtub 14 reaches the temperature (Ta + α) is a short time as (t1−ta).
[0042]
Further, if the hot water temperature is insufficient at the temperature (Ta + α) in the bathtub 14 that has been raised in a short time (t1-ta) as described above by one operation of the reheating switch 71, the user in the bathtub 14 will be described. If the user feels that, the user opens the hot water tap of the faucet 13 to pour hot water in the hot water supply tank 26 into the bathtub 14 to pour hot water, or reheats the switch again. 71 is operated.
[0043]
Here, suppose that the control device 15 sets the hot water temperature in the bathtub 14 to a temperature (Ts + α) higher than the set temperature Ts of the automatic bath operation by a constant temperature α during the reheating operation by operating the reheating switch 71. If it controls so that this, this temperature (Ts + (alpha)) will become excessively higher than the temperature (temperature in the vicinity of preset temperature Ts) which the user in the bathtub 14 feels appropriate temperature. Moreover, the time required from the time point ta when the reheating switch 71 is operated to the time point t2 when the temperature in the bathtub 14 reaches (Ts + α) requires a long time (t2−ta). However, (t2-ta)> (t1-ta).
[0044]
Therefore, according to the present embodiment, the following effects can be obtained.
[0045]
At the time of the reheating operation in which the control device 15 reheats the hot water in the bathtub 14 by operating the reheating switch 71, the temperature of the hot water in the bathtub 14 is determined from the current temperature Ta in the bathtub 14 at the start of the reheating operation. Therefore, the hot water temperature in the bathtub 14 is controlled by increasing the constant temperature α higher than the set temperature Ts of the automatic bath operation. The hot water temperature in the bathtub 14 does not become excessively higher than the set temperature Ts by the whirling operation, and the hot water temperature in the bathtub 14 is set to the desired temperature (near the set temperature Ts) in a short time by the chasing operation. Can do.
[0046]
As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this.
[0047]
【The invention's effect】
According to the first aspect of the present invention, the apparatus includes a part of a refrigerant circuit including a compressor and a heat pump heat exchanger, a hot water supply tank, a hot water heat exchanger, and a bathtub heat exchanger, An exchanger is provided so as to be connectable to a part of the refrigerant circuit, constitutes a refrigerant circuit, heats water with refrigerant heat, and can store hot water in the hot water tank, and the faucet and bathtub from the hot water tank. It is possible to supply hot water, and the heat exchanger for the bathtub is connected to a part of the refrigerant circuit to form a refrigerant circuit, and the hot water in the bathtub can be heated by the refrigerant heat to be kept warm. In the operation method of the heat pump type hot water supply apparatus, in the operation of heating the hot water in the bath by the refrigerant heat and keeping the temperature hot, if the set temperature of the hot water is Ts, the temperature of the hot water is (Ts−ΔT) or less. Heating is started when (Ts [Delta] T) heated to a predetermined temperature in the vicinity, at the time of reheating operation for reheating the hot water in the bathtub by operating the reheating switch, the hot water in the bathtub, the bathtub at the beginning of the reheating operation Since the temperature is controlled to be higher than the temperature of the hot water by a certain temperature smaller than the above ΔT , the hot water temperature in the bathtub can be set to a desired temperature in a short time.
[0048]
According to the invention described in claim 2, a part of a refrigerant circuit comprising a compressor and a heat pump heat exchanger, a hot water tank, a hot water heat exchanger, and a bathtub heat exchanger, An exchanger is provided so as to be connectable to a part of the refrigerant circuit, constitutes a refrigerant circuit, heats water with refrigerant heat, and can store hot water in the hot water tank, and the faucet and bathtub from the hot water tank. It is possible to supply hot water, and the heat exchanger for the bathtub is connected to a part of the refrigerant circuit to form a refrigerant circuit, and the hot water in the bathtub can be heated by the refrigerant heat to be kept warm. In the heat pump type hot water supply apparatus, when the hot water in the bath is heated by the refrigerant heat and kept warm, when the set temperature of the hot water is Ts, the temperature of the hot water becomes (Ts−ΔT) or less. Heating is started at around (Ts + ΔT) In the reheating operation in which the hot water in the bathtub is reheated by operating the reheating switch, the temperature of the hot water in the bathtub is changed to the hot water in the revolving bath at the start of the reheating operation. Since the control is executed so as to increase the temperature by a constant temperature smaller than the above-described ΔT , the hot water temperature in the bathtub can be set to the desired temperature in a short time.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing an embodiment of a heat pump type hot water supply apparatus according to the present invention, in which water in a hot water supply tank is heated and hot water is stored.
2 is a circuit diagram when hot water is supplied from a faucet in the heat pump type hot water supply apparatus of FIG. 1;
3 is a circuit diagram when hot water is supplied to a bathtub in the heat pump type hot water supply apparatus of FIG. 1. FIG.
4 is a circuit diagram when the hot water in the bathtub is heated (chaired) to keep warm in the heat pump type hot water supply apparatus of FIG. 1. FIG.
FIG. 5 is a graph showing the hot water temperature in the bathtub when the reheating operation is performed by operating the reheating switch.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Heat pump type hot water supply apparatus 11 Heat pump unit 12 Hot water supply unit 13 Faucet 14 Bathtub 15 Control apparatus 16 Compressor 18 Heat pump heat exchanger 26 Hot water supply tank 27 Hot water supply heat exchanger 28 Bath heat exchanger 49 Thermistor Ta Present temperature α Constant temperature

Claims (2)

A part of a refrigerant circuit comprising a compressor and a heat pump heat exchanger;
A hot water supply tank, a heat exchanger for hot water supply, and a heat exchanger for bathtubs are provided, and the heat exchanger for hot water supply is provided so as to be connectable with a part of the refrigerant circuit to constitute a refrigerant circuit, and heat is generated by the refrigerant heat. Hot water can be stored in the hot water tank, hot water can be supplied from the hot water tank to the faucet and the bathtub, and the bathtub heat exchanger can be connected to a part of the refrigerant circuit. In the operation method of the heat pump type hot water supply apparatus that configures the refrigerant circuit and heats the hot water in the bath by the heat of the refrigerant so that the heat can be maintained.
When the hot water in the bath is heated and kept warm by the refrigerant heat, when the hot water set temperature is Ts, heating is started when the hot water temperature becomes (Ts−ΔT) or less, and (Ts + ΔT) ) During a reheating operation in which the temperature is raised to a predetermined temperature in the vicinity and the hot water in the bathtub is reheated by operating the reheating switch, the hot water temperature in the bathtub is changed to the temperature in the bathtub at the start of the reheating operation. An operation method of a heat pump type hot water supply apparatus, characterized in that control is performed such that the temperature is raised by a constant temperature smaller than the ΔT above the temperature of the hot water. A part of a refrigerant circuit comprising a compressor and a heat pump heat exchanger;
A hot water supply tank, a heat exchanger for hot water supply, and a heat exchanger for bathtubs are provided, and the heat exchanger for hot water supply is provided so as to be connectable with a part of the refrigerant circuit to constitute a refrigerant circuit, and heat is generated by the refrigerant heat. Hot water can be stored in the hot water tank, hot water can be supplied from the hot water tank to the faucet and the bathtub, and the bathtub heat exchanger can be connected to a part of the refrigerant circuit. In the heat pump type hot water supply apparatus that configures the refrigerant circuit and heats the hot water in the bathtub by the heat of the refrigerant so that the heat can be maintained.
When the hot water in the bath is heated and kept warm by the refrigerant heat, when the hot water set temperature is Ts, heating is started when the hot water temperature becomes (Ts−ΔT) or less, and (Ts + ΔT) ) During a reheating operation in which the temperature is raised to a predetermined temperature in the vicinity and the hot water in the bathtub is reheated by operating the reheating switch, the hot water temperature in the bathtub is changed to the temperature in the bathtub at the start of the reheating operation. A heat pump type hot water supply apparatus that is controlled so as to be raised by a constant temperature smaller than the ΔT above the temperature of the hot water.

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