JP2006284174A - Heat pump type hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump type hot water supply device capable of improving energy efficiency. <P>SOLUTION: The heat pump type hot water supply device consists of a heat pump coolant circuit X, a water circulation circuit N for hot water supply, a first tap water pipe 38, a top part hot water outlet pipe 40 connected to a top part 26A of a hot water supply tank, a middle part hot water outlet pipe 33 connected to a middle part 26C of the hot water supply tank, a first mixing value 100 provided at a junction part of the top part water outlet pipe and a middle part outlet pipe, a second mixing valve 57 provided at a hot water supply pipe 59 at a downstream side of the first mixing valve, for mixing hot water mixed at the first mixing valve and tap water from a second tap water pipe 62 and adjusting it to be at a temperature required by utility parts including a bath tub 14 to supply it to the utility parts, a circulation passage for introducing hot water from the top part of the water supply tank and returning it to the middle part of the hot water supply tank via a heat exchanger 28 for the bath tub and a water circulation circuit P for the bath tub for circulating hot water or cold water in the bath tub to the heat exchanger for the bath tub and heating it by the hot water from the hot water supply tank. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat pump type hot water supply apparatus that heats water with refrigerant heat and can store hot water in a hot water supply tank.

  2. Description of the Related Art Conventionally, a heat pump type hot water supply apparatus has been proposed in which a hot water supply heat exchanger heats water with refrigerant heat and can store hot water in a hot water supply tank (see Patent Document 1).

  With the thing of the said patent document 1, although it is possible to raise the temperature of the hot water stored in a hot water supply tank to 60 degreeC or more, for example, it is difficult to raise temperature significantly more than it. Therefore, when the refrigerant containing a large amount of carbon dioxide is used as the refrigerant, the temperature of the hot water stored in the hot water supply tank can be increased to, for example, about 90 ° C. because the refrigerant pressure is higher than that of the chlorofluorocarbon refrigerant. Is possible.

Generally, in a heat pump type hot water supply device, the hot water temperature at the top of the hot water tank is higher than the others, so a hot water pipe is connected to this top, and water is mixed with the hot water supplied through this to make the temperature appropriate. Hot water is supplied above.
JP-A-11-193958

  By the way, in the heat pump type hot water supply apparatus described in Patent Document 1, since the hot water temperature at the top of the hot water supply tank becomes high, a hot water supply pipe is connected to the top and water is mixed with the hot water supplied through this pipe. And hot water after making the temperature appropriate. However, when the hot water temperature of the hot water supply tank is high, it is necessary to mix a large amount of water with this hot water, and there is a problem that the energy efficiency of this heat pump hot water supply device is lowered.

  The present invention has been made in consideration of the above-described circumstances, and provides a heat pump type hot water supply apparatus capable of improving energy efficiency by effectively using hot water in an intermediate portion in a hot water supply tank.

  The invention described in claim 1 has at least a compressor (16), a heat pump heat exchanger (18), and a refrigerant-to-water heat exchanger (27), which are connected in a loop by a refrigerant pipe (19). A heat pump refrigerant circuit (X), at least a hot water supply tank (26), a circulation pump (34), and a refrigerant-to-water heat exchanger (27), which are connected in a loop by a hot water supply water pipe (36). And water in the bottom (26B) in the hot water supply tank (26) is circulated to the refrigerant-to-water heat exchanger (27) and heated by the refrigerant heat of the heat pump refrigerant circuit (X). The hot water heated in the hot water tank (26) is returned to the top (26A) and stored in the hot water tank (26), and the hot water tank (26) has a bottom (26B). Connected to the tap water at all times The hot water supply tank (26) is connected to the first tap water pipe (38) that can be supplied so that pressure acts in the hot water supply tank (26), and the top (26A) of the hot water supply tank (26). A hot water supply pipe (40) for taking out hot water of (26A) and an intermediate part (26C) of the hot water supply tank (26), and hot water having an intermediate temperature of the hot water supply tank (26) intermediate part (26C). High temperature hot water and intermediate hot water from the upper hot water supply pipe (40) provided at the junction of the intermediate hot water supply pipe (33) to be taken out and the upper hot water supply pipe (40) and the intermediate hot water supply pipe (33). A first mixing valve (100) for mixing hot water of intermediate temperature from the pipe (33), and a hot water supply pipe (59) on the downstream side of the first mixing valve (100); The hot water from the hot water supply pipe (59) after being mixed by the mixing valve (100) and the first The tap water from the second tap water pipe (62) connected to the tap water pipe (38) is mixed and adjusted to hot water having the required temperature in the use section including the bathtub (14). The second mixing valve (57) to be supplied and the hot water of the hot water tank (26) and the top (26A) are led out from the top (26A) of the hot water tank (26), and the hot water for the bathtub ( 28) through the circulation path (101, 103) returning to the intermediate part (26C) of the hot water supply tank (26), and the hot water or water in the bathtub (14) is circulated to the heat exchanger (28) for the bathtub. It has a water circulation circuit (P) for a bathtub that is heated with hot water derived from a hot water supply tank (26).

  The invention according to claim 2 is configured such that in the heat pump hot water supply apparatus according to claim 1, the water in the hot water supply tank (26) is heated only by the refrigerant heat of the heat pump refrigerant circuit (X). It is characterized by.

  The invention according to claim 3 is the heat pump type hot water supply apparatus according to claim 1, wherein the top hot water supply pipe (40) of the hot water supply water circulation circuit (N) and the hot water supply pipe (36) and the top hot water supply pipe ( 40) is characterized by being individually connected to the top part (26A) of the hot water supply tank (26).

  In the present invention, it is possible to effectively use hot water at an intermediate temperature in the intermediate portion in the hot water tank, and to suppress unnecessary boiling due to excessive removal of hot water in the heaven portion in the hot water tank, Energy efficiency can be improved.

  The present invention includes a heat pump refrigerant circuit having at least a compressor, a heat pump heat exchanger, and a refrigerant-to-water heat exchanger, which are connected in a loop by refrigerant piping, at least a hot water supply tank, a circulation pump, and a refrigerant-to-water refrigerant. It has a heat exchanger and is connected in a loop by a hot water supply water pipe, and the water in the bottom of the hot water tank is circulated to the refrigerant-to-water heat exchanger to generate the heat of the refrigerant in the heat pump refrigerant circuit. The hot water heated by this refrigerant heat is returned to the top of the hot water supply tank so that it can be stored in the hot water supply tank, and connected to the bottom of the hot water supply tank. A first tap water pipe that can be supplied to act in the tank, a top hot water outlet pipe that is connected to the top of the hot water tank and takes out hot water from the hot water tank top, and an intermediate between the hot water tank Is connected to the intermediate hot water outlet pipe for taking out the hot water at the intermediate temperature of the hot water tank, and the junction of the upper hot water outlet pipe and the intermediate hot water outlet pipe. A first mixing valve that mixes the intermediate temperature hot water from the partial hot water piping, and a hot water supply piping that is provided in the hot water supply piping downstream of the first mixing valve and mixed by the first mixing valve The hot water from the hot water and the tap water from the second tap water pipe connected to the first tap water pipe are mixed, adjusted to the hot water at the required temperature in the use section including the bathtub, and supplied to the use section A second mixing valve, a circulation path that is led out from the top of the hot water tank and returns hot water from the hot water tank to the middle of the hot water tank through the heat exchanger for the bathtub, and hot water in the bathtub Or circulate the water to the heat exchanger for the bathtub and heat with hot water derived from the hot water tank That water for bathtub has a configuration that includes a circulation circuit, describes an embodiment of the present invention are described below.

  An embodiment of the present invention will be described below with reference to FIGS.

  FIG. 1 shows an embodiment of a heat pump type hot water supply apparatus according to the present invention, and is a circuit diagram when water in a hot water supply tank is heated and hot water is stored in the tank.

  As shown in FIG. 1, the heat pump type hot water supply apparatus 10 includes a heat pump unit 11, a hot water supply unit 12, a faucet 13, a bathtub 14, and control devices 15A and 15B.

  The heat pump unit 11 includes a compressor 16, a hot water supply heat exchanger (refrigerant-to-water heat exchanger) 27, a heat pump heat exchanger 18, and an accumulator 17 that are sequentially arranged and connected in a loop through a refrigerant pipe 19. A refrigerant circuit X is provided. The compressor 16 compresses the refrigerant. The hot water supply heat exchanger 27 heats hot water or water by the heat of the refrigerant discharged from the compressor 16. In this embodiment, a refrigerant containing a large amount of carbon dioxide is used as the refrigerant. That is, the heat pump refrigerant circuit X uses carbon dioxide as a refrigerant. Thus, when carbon dioxide is used as the refrigerant, the refrigerant pressure is usually higher than that of the chlorofluorocarbon refrigerant.

  The aforementioned hot water supply unit 12 includes a hot water supply tank 26, a bathtub heat exchanger (water-to-water heat exchanger) 28, a faucet hot water supply line 71, a bathtub pouring line 72, and the like.

  The hot water supply tank 26 stores hot water heated by refrigerant heat using a hot water supply heat exchanger 27. The hot water supply tank 26 and the hot water supply heat exchanger 27 are connected in a loop by a hot water supply water pipe 36 provided with a hot water supply circulation pump 34, a flow rate adjusting valve 35, and a first switching electromagnetic valve 73. When the valve 73 is opened, as shown by the thick line in FIG. 1, a hot water supply water circulation circuit N for circulating water is configured.

  When carbon dioxide is used as the refrigerant, as described above, the refrigerant pressure becomes higher than that of the chlorofluorocarbon refrigerant, and the temperature of the hot water stored in the hot water supply heat exchanger 27 rises to about 90 ° C.

  Since the heat pump unit 11 and the hot water supply unit 12 are connected in a loop shape by the hot water supply water pipe 36, compared to the conventional case, the high pressure refrigerant pipe (for example, the refrigerant pipe 19) is not exposed to the outside, and the heat pump hot water supply apparatus. Safety can be improved.

  A first tap water pipe 38 provided with a pressure reducing check valve 37 is connected to the bottom portion 26 </ b> B of the hot water supply tank 26 so that tap water can be always supplied into the hot water supply tank 26. Therefore, tap water pressure always acts in the hot water supply tank 26.

  Further, the top 26A of the hot water supply tank 26 is connected to a top hot water discharge pipe 40 having a pressure relief valve 39. The intermediate portion 26C between the top 26A and the bottom 26B of the hot water tank 26 has an intermediate hot water supply. A pipe 33 is connected, and a mixing valve 100 such as a wax valve serving as a first mixing valve is disposed at the junction of the hot water pipes 33 and 40.

  When the water in the bottom portion 26B 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 converts the supplied water into the heat pump unit 11. It heats with the heat | fever of the refrigerant gas discharged from the compressor 16. When the first switching solenoid valve 73 is opened, the heated hot water or water is adjusted in flow rate by the flow rate adjusting valve 35 and guided to the top 26A of the hot water supply tank 26, and has an upper limit of about 90 ° C. in the hot water supply tank 26. Hot water can be stored.

  The pressure relief valve 39 releases the pressure when hot water or water is heated excessively and the pressure in the hot water supply tank 26 becomes excessive.

  The bathtub heat exchanger 28 is a water-to-water heat exchanger that circulates hot water in the hot water supply tank 26 to replenish hot water in the bathtub 14. Hot water in the hot water supply tank 26 is pumped out by driving the pump 102 in the circulation pipe 101 led out from the top portion 26A. The pumped hot water is led to the bathtub heat exchanger 28 through the circulation pipe 101 (circulation path) to heat (repel) the hot water or water in the bathtub 14, and then the second switching solenoid valve. 74 and the return pipe 103 (circulation path), the hot water tank 26 is returned to the intermediate portion 26C between the top portion 26A and the bottom portion 26B.

  That is, the bathtub heat exchanger 28 is brought into contact with the introduction water pipe 75 that guides hot water in the hot water supply tank 26 and the first bathtub water pipe 51 that guides hot water or water in the bathtub 14. And the hot water or water respectively flowing through the first bathtub water pipe 51 are configured to be able to exchange heat. The introduction water pipe 75 and the first bathtub water pipe 51 are formed in a flat tube shape in the portion constituting the bathtub heat exchanger 28 and the contact area is increased.

  The first bathtub water pipe 51 communicating the bathtub heat exchanger 28 and the bathtub 14 includes a bathtub circulation pump 46, a filter 47, a water level sensor 48, a thermistor 49, and a flow switch 50.

  This first bathtub water pipe 51 constitutes a bathtub water circulation circuit P in which hot water or water circulates between the bathtub heat exchanger 28 and the bathtub 14.

  Since the water level sensor 48 communicates with the bathtub 14 via the first bathtub water pipe 51, the water level sensor 48 detects the level of hot water or water in the bathtub 14. Further, the thermistor 49 detects the hot water temperature when the hot water or water is circulating in the bathtub water circulation circuit P, and indirectly detects the hot water temperature in the bathtub 14. Moreover, the flow switch 50 detects that hot water or water is circulating in the water circulation circuit P for bathtubs. Further, the filter 47 filters hot water together with a filter (not shown) disposed in the bathtub 14.

  As described later, hot water is poured into the bathtub 14 to fill the bathtub 14, and when the hot water in the bathtub 14 is replenished, the circulation pump 102 and the bathtub circulation pump 46 are operated. Then, as shown by the thick line in FIG. 4, the hot water in the hot water supply tank 26 and the hot water in the bathtub 14 flow into the bathtub heat exchanger 28, where heat is exchanged, and the hot water in the bathtub 14 is The hot water in the hot water supply tank 26 is chased away. The hot water worked in the bathtub heat exchanger 28 is lowered to about 50 ° C. by the heat exchange, and flows into the intermediate portion 26 </ b> C of the hot water supply tank 26 through the water pipe 103.

  The faucet hot water supply line 71 includes a hot water supply pipe 59, a mixing control valve 57 as a second mixing valve provided in the hot water supply pipe 59 on the downstream side of the mixing valve 100, and a flow sensor 58, as indicated by a thick line Q in FIG. It is configured with. Since the tap water pressure is applied to the hot water supply tank 26 via the first tap water pipe 38, the hot water in the hot water supply tank 26 can be supplied to the tap 13 by opening the tap 13.

  The flow sensor 58 detects the amount of hot water flowing through the hot water supply pipe 59. Further, the mixing control valve 57 as the second mixing valve is disposed downstream of the pressure reducing check valve 37 of the first tap water pipe 38 through the second tap water pipe 62 as shown by a thick line R in FIG. Connected.

  Therefore, by controlling the opening degree of the mixing control valve 57, the hot water from the hot water supply pipe 59 and the tap water from the second tap water pipe 62 are mixed, and the hot water supplied from the faucet 13 is about 60 ° C. or less, for example 42 Adjusted to ° C.

  As shown by the thick line S in FIG. 3, the bathtub pouring line 72 is provided between the downstream side of the flow sensor 58 in the hot water supply pipe 59 and the space between the bathtub circulation pump 46 and the flow switch 50 in the first bathtub water pipe 51. The hot water in the hot water supply tank 26 can be poured into the bathtub 14 by being connected by the bathtub water pipe 68. In the second bathtub water pipe 68, a flow sensor 64, a pouring electromagnetic valve 65, a relief means 66, a check valve 67, and an electromagnetic valve 54 are sequentially arranged from the hot water supply pipe 59 side.

  Here, the flow sensor 64 detects the amount of hot water flowing in the second bathtub water pipe 68. The relief means 66 and the check valve 67 release pressure when excessively heated hot water flows through the second bathtub water pipe 68. The solenoid valve 54 is opened when hot water is supplied to the bath, and is closed when reheating.

  When the hot water solenoid valves 65 and 54 are opened while the bathtub circulation pump 46 is stopped, the hot water in the hot water supply tank 26 becomes part of the hot water supply pipe 59 and The second bathtub water pipe 68 flows into the first bathtub water pipe 51 and is poured into the bathtub 14 through the flow switch 50, the thermistor 49, the water level sensor 48, and the filter 47 in the first bathtub water pipe 51. .

  When the water level sensor 48 detects that a proper amount of hot water has been poured into the bathtub 14 from the hot water supply tank 26, the hot water solenoid valves 65 and 54 are closed. Thereafter, when the thermistor 49 detects that the temperature of the hot water in the bathtub 14 has fallen below the appropriate temperature, the hot water or the water in the bathtub 14 is heated (fired) as described above, and the hot water in the bathtub 14 is heated. Is kept warm.

  In this way, an operation in which an appropriate amount of hot water is poured from the hot water supply tank 26 into the bathtub 14 and then the hot water in the bathtub 14 is heated to an appropriate temperature for a predetermined time (retreating) is referred to as automatic bath operation. .

  In the above-described embodiment, since the heat pump refrigerant circuit X using carbon dioxide as the refrigerant is provided, the temperature of the hot water stored in the hot water supply tank 26 is about 90 ° C. as compared with the refrigerant circuit using the fluorocarbon refrigerant. Will rise significantly. According to this, by circulating the hot water in the hot water supply tank 26, the hot water in the bathtub 14 can be replenished with this hot water temperature. Therefore, in the case of chasing a bath without supplying hot water, it is not necessary to operate the heat pump unit 11 and energy efficiency can be improved.

  The control device 15A is installed in the heat pump unit 11, and controls the operation (including capacity control) and stop of the compressor 16. The control device 15B is installed in the hot water supply unit 12 to operate or stop the hot water supply circulation pump 34 and the bathtub circulation pump 46, the first switching electromagnetic valve 73, the second switching electromagnetic valve 74, and the hot water supply electromagnetic valve. The opening and closing of the flow control valve 35 and the mixing control valve 57 are controlled. The control device 15B is connected to the control device 15A of the heat pump unit 11 by a communication line 78, enables bidirectional communication, and is connected to the remote controller 79 in a wired or wireless state.

  With the configuration described above, according to the above-described embodiment, for example, the following operational effects can be obtained.

  A hot water supply heat exchanger 27 that heats water with refrigerant heat and can store hot water in the hot water supply tank 26 is disposed in the heat pump unit 11 including the compressor 16 that compresses the refrigerant, and the hot water supply tank 26 is the hot water supply unit. 12, the heat exchanger 28 for the bathtub is configured to heat the hot water or water in the bathtub 14 by the heat of the hot water heated by the hot water supply heat exchanger 27, so that the heat can be kept. Since the refrigerant pipe 19 through which the high-pressure refrigerant flows is disposed only in the heat pump unit 11 and is not disposed between the heat pump unit 11 and the hot water supply unit 12, these high-pressure refrigerant pipes are exposed to the outside. Can be prevented, and the safety of the heat pump hot water supply apparatus 10 can be improved.

  The bathtub heat exchanger 28 is a portion corresponding to the bathtub heat exchanger 28, that is, an introduction water pipe 75 that guides hot water in the hot water supply tank 26 and a first bathtub water pipe 51 that guides hot water or water in the bathtub 14. Since the hot water or water flowing through both pipes (introductory water pipe 75 and first bathtub water pipe 51) can be exchanged by heat, the heat pump unit 11 is operated at the time of bathing. There is no need to improve energy efficiency. Moreover, even if one piping is damaged among both piping (introduction water piping 75 and the 1st bathtub water piping 51), the other piping is not influenced by it. For example, even if the first bathtub water pipe 51 is damaged, for example, contaminated hot water or water in the first bathtub water pipe 51 is not mixed into the hot water or water in the introduction water pipe 75. Since the contaminated hot water does not flow into the hot water supply tank 26 through the first bathtub water pipe 51, the hot water or water in the hot water supply tank 26 can be always kept clean.

  Since the heat pump unit 11 includes the heat pump refrigerant circuit X using carbon dioxide as a refrigerant, the temperature of the hot water stored in the hot water supply tank 26 is greatly increased to about 90 ° C. as compared with the refrigerant circuit using the chlorofluorocarbon refrigerant. To rise. According to this, the hot water temperature in the substantially middle part 26C of the hot water supply tank 26 is often maintained at about 50 ° C. If so, the required temperature at the faucet 13 is often about 42 to 43 ° C., so that the hot water in the intermediate portion 26C can be used as it is. The hot water stored in the hot water supply tank 26 is heated and boiled only by the refrigerant heat of the heat pump refrigerant circuit X.

  In the present embodiment, the first hot water pipe 38 connected to the bottom 26B of the hot water supply tank 26 and capable of supplying tap water so that the tap water pressure is always applied to the hot water supply tank 26, and the hot water supply tank 26 are provided. An intermediate temperature in the intermediate portion 26C of the hot water supply tank 26, connected to the heaven portion, connected to a hot water outlet pipe 40 for taking out hot hot water of the heaven portion 26A in the hot water supply tank 26, and an intermediate portion 26C of the hot water supply tank 26. The hot water from the heaven hot water piping 40 and the intermediate hot water piping 33 are provided at the junction of the intermediate hot water piping 33 for taking out hot water and the heaven hot water piping 40 and the intermediate hot water piping 33. Mixing valve 100 as a first mixing valve that mixes hot water at a temperature, and hot water supply pipe 59 that is provided in hot water supply pipe 59 downstream of mixing valve 100 and mixed by mixing valve 100 The hot water from the pipe 59 and the tap water from the second tap water pipe 62 connected to the first tap water pipe 38 are mixed to adjust the hot water at the required temperature at the faucet 13 as the utilization section. 13 and a mixing control valve 57 as a second mixing valve to be supplied to 13.

  Therefore, when the hot water temperature in the intermediate portion 26C of the hot water supply tank 26 has reached a temperature near the required temperature at the faucet 13, the hot water in the intermediate portion 26C can be directly taken out from the faucet 13 through the mixing valve 100.

  When the hot water temperature in the intermediate portion 26C is low, the mixing valve 100 mixes a large amount of hot water from the top portion 26A and sends it to the hot water supply pipe 59. Moreover, when the hot water temperature of the intermediate part 26C is high, the hot water from the top part 26A is sent to the hot water supply pipe 59 with little mixing. When the temperature of hot water passing through the mixing valve 100 is equal to or higher than the hot water temperature at the faucet 13, hot water from the hot water supply pipe 59 and tap water from the second tap water pipe 62 are controlled by opening control of the mixing control valve 57. The temperature of the hot water mixed and supplied from the faucet 13 is adjusted to, for example, 42 ° C., which is the required temperature at the faucet 13.

  According to this, the hot water in the hot water supply tank 26 can be sent out to the faucet 13 as it is without lowering the temperature with city water such as tap water. Energy efficiency can be improved.

  For example, a wax valve is used as the mixing valve 100, so that the cost can be reduced. On the other hand, an electric valve using a stepping motor or the like is used as the mixing control valve 57, and the mixing accuracy is maintained high.

  Here, as shown in FIGS. 1 to 4, the hot water supply water pipe 36 and the top hot water discharge pipe 40 of the hot water supply water circulation circuit N are individually connected to the top part 26 </ b> A of the hot water supply tank 26. Has been. That is, the hot water supply water circulation circuit N for boiling the hot water in the hot water supply tank 26 is independent of the top hot water supply pipe 40 for taking out the hot water to be supplied to the faucet 13 and the bathtub 14. It is possible to supply hot water to the faucet 13 and the bathtub 14 even during the boiling operation, and to the mixing control valve 57 downstream of the mixing valve 100 regardless of whether the heating operation is being performed or the boiling operation is stopped. It is possible to supply hot water having a stable temperature, and in the mixing control valve 57, adjustment of hot water having a temperature required for the faucet 13 or the bathtub 14 can be performed stably and accurately.

  As mentioned above, although this invention was demonstrated based on the said one Example, this invention is not limited to this.

FIG. 2 is a circuit diagram showing an embodiment of the 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 in the tank. In FIG. 1, it is a circuit diagram when supplying hot water to a faucet. In FIG. 1, it is a circuit diagram when pouring into a bathtub. In FIG. 1, it is a circuit diagram when the hot water or water in a bathtub is heated (it chases), and is kept warm.

Explanation of symbols

N Water supply water circulation circuit X Heat pump refrigerant circuit P Bath water circulation circuit 10 Heat pump hot water supply device 11 Heat pump unit 12 Hot water supply unit 13 Faucet 14 Bathtub 16 Compressor 18 Heat pump heat exchanger 19 Refrigerant piping 26 Hot water supply tank 26A Hot water tank top 26B Hot water tank bottom 26C Hot water tank intermediate 27 Hot water heat exchanger (refrigerant to water heat exchanger)
28 Bath heat exchanger (water-to-water heat exchanger)
33 Intermediate hot water piping 34 Hot water circulation pump (circulation pump)
36 Hot water supply water pipe 38 First water pipe (first water pipe)
40 Top hot spring piping 57 Mixing control valve (second mixing valve)
59 Hot water supply piping 62 Second water supply piping (second water supply piping)
100 mixing valve (first mixing valve)
101 Circulation piping (circulation path)
103 Return piping (circulation path)

Claims (3)

A heat pump refrigerant circuit (X) having at least a compressor (16), a heat pump heat exchanger (18), and a refrigerant-to-water heat exchanger (27), which are connected in a loop by a refrigerant pipe (19); ,
It has at least a hot water supply tank (26), a circulation pump (34) and a refrigerant-to-water heat exchanger (27), which are connected in a loop by a hot water supply water pipe (36), and the hot water supply tank (26) Water in the bottom (26B) of the inside is circulated to the refrigerant-to-water heat exchanger (27) and heated by the refrigerant heat of the heat pump refrigerant circuit (X), and the hot water heated by the refrigerant heat is supplied to the hot water supply tank (26 A hot water supply water circulation circuit (N) that can be stored in the hot water supply tank (26) by returning to the top (26A) of
A first tap water pipe (38) connected to the bottom (26B) of the hot water supply tank (26) and capable of supplying tap water so that the tap water pressure always acts in the hot water supply tank (26);
A top hot water supply pipe (40) connected to the top (26A) of the hot water supply tank (26) and for taking out hot water from the hot water tank (26) top (26A);
An intermediate hot water supply pipe (33) connected to the intermediate part (26C) of the hot water supply tank (26) and taking out hot water at an intermediate temperature of the hot water supply tank (26) intermediate part (26C);
High temperature hot water from the top hot water supply pipe (40) and intermediate hot water from the intermediate hot water supply pipe (33) provided at the junction of the top hot water supply pipe (40) and the intermediate hot water supply pipe (33). A first mixing valve (100) for mixing
Hot water from the hot water supply pipe (59) after being mixed by the first mixing valve (100) and the first hot water supply pipe (59) provided on the downstream side of the first mixing valve (100) and the first mixing valve (100). The tap water from the second tap water pipe (62) connected to the tap water pipe (38) is mixed and adjusted to the hot water at the required temperature in the use section including the bathtub (14). A second mixing valve (57) for feeding;
Derived from the top (26A) of the hot water tank (26), the hot water in the hot water tank (26) top (26A) passes through the bathtub heat exchanger (28), 26C) and the circulation path (101, 103),
A bath water circulation circuit (P) for circulating the hot water or water in the bath (14) to the bath heat exchanger (28) and heating with hot water derived from the hot water supply tank (26); A heat pump type hot water supply device.   The heat pump type hot water supply apparatus according to claim 1, wherein water in the hot water supply tank (26) is heated only by the refrigerant heat of the heat pump refrigerant circuit (X).   The hot water supply water pipe (36) and the top hot water supply pipe (40) of the hot water supply water circulation circuit (N) are individually connected to the top (26A) of the hot water supply tank (26). The heat pump type hot water supply apparatus according to claim 1.

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