JP2006153456A - 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 by utilizing effectively hot water in the middle part in a hot-water supply tank. <P>SOLUTION: This device is equipped with the hot-water supply tank 26, a heat pump coolant circuit X, a water circulation circuit N for hot-water supply, a service water pipe 38 capable of supplying service water, a top-part hot-water outlet pipe 40 for supplying hot water of a top part in the hot-water supply tank, an middle-part hot-water outlet pipe 33 for supplying hot water of a middle part in the hot-water supply tank, a control means 15B for selecting either of the hot water supplied through the top-part hot-water outlet pipe and the hot water supplied through the middle-part hot-water outlet pipe corresponding to the hot-water temperature of the middle part in a hot-water storage tank, and a mixing control valve 57 for adjusting hot water having a required temperature at a faucet 15 by mixing hot water from a hot-water supply pipe 59 where the top-part hot-water outlet pipe and the middle-part hot-water outlet pipe are joined together with the service water. The device is constituted so that, when the hot-water temperature at the middle part in the hot-water supply tank is lower than the hot-water temperature required at the faucet, the hot water on the top part side of the hot-water supply tank is taken out and supplied to the hot-water supply pipe. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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

  However, when the hot water temperature of the hot water supply tank is high, it is necessary to lower the hot water temperature by mixing a large amount of tap water with the hot water at the time of hot water supply, and there is a problem that the energy efficiency of this heat pump hot water supply device is lowered.

  The object of the present invention is made in consideration of the above-mentioned circumstances, and provides a heat pump type hot water supply apparatus capable of improving energy efficiency by effectively using hot water in an intermediate part in a hot water supply tank. It is in.

  The invention according to claim 1 is a heat pump refrigerant circuit having a hot water supply tank capable of storing hot water, at least a compressor, a heat pump heat exchanger, and a refrigerant-to-water heat exchanger, and using a refrigerant having carbon dioxide. The water at the bottom of the hot water tank is taken out and heated with the heat of the refrigerant discharged from the compressor in the refrigerant-to-water heat exchanger, and then the heated hot water is supplied from the top of the hot water tank. A hot water circulation circuit for returning the water to the tank, a tap water pipe provided at the bottom of the hot water tank, and capable of supplying tap water so that the tap water pressure is always applied to the hot water tank, and the top of the hot water tank The hot water supply pipe for supplying hot water in the upper part of the hot water supply tank and the intermediate part of the hot water tank for supplying hot water in the intermediate part in the hot water tank. Part hot water piping, Control means for selecting either hot water supplied through the top hot water piping or hot water supplied through the intermediate hot water piping according to the hot water temperature in the intermediate portion in the hot water storage tank, and the top hot water piping And a mixing control valve that adjusts the hot water at the faucet by mixing hot water and hot water from the hot water supply pipe joined by the intermediate hot water supply pipe, and the hot water temperature in the intermediate hot water tank is When the temperature is lower than the required hot water temperature at the faucet, the hot water on the top side of the hot water supply tank is taken out and supplied to the hot water supply pipe.

  According to a second aspect of the present invention, in the heat pump hot water supply apparatus according to the first aspect, the hot water in the hot water supply tank is led out from the top and circulated to the intermediate portion of the hot water tank through a heat exchanger for a bathtub. And a water circulation circuit for the bathtub that circulates the hot water or water in the bathtub to the heat exchanger for the bathtub and heats it with the hot water derived from the hot water tank, and the hot water temperature in the bathtub is lowered below an appropriate temperature. The heating is performed when the heating is performed.

  According to a third aspect of the present invention, in the heat pump hot water supply apparatus according to the second aspect, the top hot water supply pipe and the circulation pipe are each independently attached to the hot water supply tank.

  According to the present invention, a hot water supply tank capable of storing hot water, a heat pump refrigerant circuit using a refrigerant having carbon dioxide having at least a compressor, a heat pump heat exchanger, and a refrigerant-to-water heat exchanger, Water at the bottom of the hot water tank is taken out and heated with the heat of the refrigerant discharged from the compressor in the refrigerant-to-water heat exchanger, and then the heated hot water is transferred from the top of the hot water tank into the hot water tank. A hot water supply water circulation circuit to be returned, provided at the bottom of the hot water tank, and provided with tap water piping for allowing tap water to be supplied so that the tap water pressure is always applied to the hot water tank, and at the top of the hot water tank. A hot water supply pipe for supplying hot water in the upper part of the hot water supply tank, and an intermediate hot water supply pipe for supplying hot water in the intermediate part of the hot water supply tank provided in the intermediate part between the top and bottom of the hot water supply tank And the hot water storage Control means for selecting either hot water supplied through the top hot water piping or hot water supplied through the intermediate hot water piping according to the hot water temperature in the intermediate portion in the tank, and the top hot water piping and the intermediate And a mixing control valve that adjusts the hot water at the required temperature at the faucet by mixing hot water from the hot water supply pipe joined by the hot water supply pipe and tap water, and the hot water temperature in the middle of the hot water tank is at the faucet. When the hot water temperature is lower than the required hot water temperature, the hot water on the top side of the hot water supply tank is taken out and supplied to the hot water supply pipe. Efficient use of hot water and tap water, respectively, can supply hot water at the required temperature, and prevent unnecessary hot water mixing and unnecessary boiling. Energy efficiency That.

  The present invention aims to provide a heat pump hot water supply device capable of improving energy efficiency by effectively using hot water in an intermediate portion in a hot water supply tank, and a hot water supply tank capable of storing hot water, at least A heat pump refrigerant circuit having a compressor, a heat pump heat exchanger, and a refrigerant-to-water heat exchanger, using a refrigerant having carbon dioxide, and taking out water at a bottom portion in the hot water tank; A hot water circulation circuit for returning the heated hot water from the top of the hot water supply tank to the hot water supply tank, and at the bottom of the hot water supply tank. Tap water piping that allows water to be supplied so that the tap water pressure is always applied to the hot water tank, and the hot water of the upper part of the hot water tank are provided at the top of the hot water tank. A hot water outlet pipe, an intermediate hot water pipe provided at an intermediate portion between the top and bottom of the hot water tank and supplying hot water in the intermediate portion of the hot water tank, and an intermediate hot water temperature in the hot water storage tank. Depending on the control means for selecting either hot water supplied through the top hot water supply pipe or hot water supplied through the intermediate hot water supply pipe, and the hot water hot water supply pipe joined by the top hot water supply pipe and the intermediate hot water supply pipe And a mixing control valve for adjusting hot water at a required temperature at the faucet by mixing hot water from tap and tap water, and the hot water temperature at the intermediate portion in the hot water tank is lower than the required hot water temperature at the faucet In this case, the hot water on the top side of the hot water supply tank is taken out and supplied to the hot water supply pipe, and one embodiment of the present invention will be 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 26 A of the hot water supply tank 26 is connected to a top hot water discharge pipe 40 having a first on-off valve 91 for taking out hot hot water from the top of the hot water supply tank 26. An intermediate portion hot water supply pipe 33 having a second on-off valve 92 for taking out hot water in an intermediate temperature region of the intermediate portion in the hot water supply tank 26 is connected to a substantially intermediate portion 26C between the portion 26A and the bottom portion 26B. The first and second on-off valves 91 and 92 connected to the pipes 40 and 33 are respectively connected via the control device 15B according to the hot water temperature detected by the temperature sensor 94 installed in the intermediate part 26C of the hot water tank 26. Open / close controlled selectively.

  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. Is heated by the heat of the refrigerant gas discharged from the compressor 16 of the heat pump refrigerant circuit X. 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.

  39 is a pressure relief valve, and this pressure relief valve 39 is for releasing this pressure out of the hot water supply tank 36 when the hot water or water is heated excessively and the pressure in the hot water supply tank 26 becomes excessive. is there.

  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 to heat (repel) the hot water or water in the bathtub 14, and then the second switching solenoid valve 74 and the return It returns to the intermediate part 26C between the top part 26A and the bottom part 26B of the hot water supply tank 26 via the pipe 103.

  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, and a flow sensor 58, as shown by a thick line Q in FIG. Since 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 faucet 13 as a utilization part by opening the faucet 13. The

  The flow sensor 58 detects the amount of hot water flowing through the hot water supply pipe 59. Further, the mixing control valve 57 is connected to the downstream side 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.

  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 Q in FIG. 3, the bathtub pouring line 72 has a second passage between 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 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 water flows through the second bathtub water pipe 68 and reaches 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. It will rise significantly to. 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.

  In the present embodiment, a top hot water discharge pipe 40 having a first on-off valve 91 is connected to the top portion 26A of the hot water supply tank 26, and a substantially intermediate portion 26C between the top portion 26A and the bottom portion 26B of the hot water supply tank 26 is connected. An intermediate hot water supply pipe 33 having a second open / close valve 92 is connected, and the first and second open / close valves 91 and 92 connected to the pipes 40 and 33 are temperatures set in the intermediate part 26C of the hot water supply tank 26. Depending on the hot water temperature detected by the sensor 94, opening / closing is controlled via the control device 15B.

  For example, if the hot water temperature detected by the temperature sensor 94 is about 50 ° C., the hot water temperature is close to the required temperature at the faucet 13. In this case, the first on-off valve 91 is closed and the second on-off valve 92 is opened. Thereby, the hot water of the intermediate portion 26 </ b> C can be taken out from the faucet 13.

  In this case, by controlling the opening degree of the mixing control valve 57, hot water from the hot water supply pipe 59 and tap water from the second tap water pipe 62 are mixed, and the temperature of the hot water supplied from the faucet 13 is 42 ° C., for example. Adjusted to As the mixing control valve 57, an electric valve using a stepping motor or the like is used, and the mixing accuracy is maintained high.

  When the hot water temperature of the intermediate portion 26C is lower than the hot water temperature required for the faucet 13, for example, the second on-off valve 92 is closed and the first on-off valve 91 is opened. Thereby, the hot water of the top part 26A is taken out. Also in this case, the temperature of hot water supplied from the faucet 13 by mixing hot water from the hot water supply pipe 59 and tap water from the second tap water pipe 62 by controlling the opening degree of the mixing control valve 57 is 42, for example. Adjusted to ° C.

  According to the present embodiment, a heat pump refrigerant that has a hot water supply tank 26 capable of storing hot water, a compressor 16, a heat pump heat exchanger 18, and a refrigerant-to-water heat exchanger 27, and uses a refrigerant containing carbon dioxide. The water of the bottom part 26B in the circuit X and the hot water supply tank 26 is taken out and heated by the heat of the refrigerant discharged from the compressor 16 by the refrigerant-to-water heat exchanger 27, and then the heated hot water is used as the hot water supply. A hot water supply water circulation circuit N returning from the top 26A of the tank 26 to the hot water supply tank 26 and a bottom portion 26B of the hot water supply tank 26 are provided so that tap water can be constantly supplied to the hot water supply tank 26. The first tap water pipe 38, the top 26A of the hot water tank 26, the top hot water supply pipe 40 for supplying hot water in the upper part of the hot water tank 26, and the top 26 of the hot water tank 26. The intermediate portion hot water supply pipe 33 for supplying hot water in the intermediate portion 26C in the hot water supply tank 26 and the hot water temperature in the intermediate portion 26 in the hot water storage tank 26 are provided in an intermediate portion 26C between the hot water tank 26 and the bottom portion 26B. A control device 15A that selects either hot water supplied through the top hot water supply pipe 40 or hot water supplied through the intermediate hot water supply pipe 33, and a hot water supply pipe in which the upper hot water supply pipe 40 and the intermediate hot water supply pipe 33 merge. And a mixing control valve 57 for adjusting hot water at a required temperature at the faucet 13 by mixing hot water from 59 and tap water, and the hot water temperature at the intermediate portion 26C in the hot water supply tank 26 is required at the faucet 13. When the temperature is lower than the hot water temperature, the hot water on the top portion 26A side of the hot water supply tank 26 is taken out and supplied to the hot water supply pipe 59.

  Therefore, not only high-temperature hot water of about 90 ° C. taken out from the top of the hot water tank 26 but also hot water in an intermediate temperature range of about 50 ° C. taken out from the middle portion of the hot water tank 26 can be used effectively. Mixing tap water and suppressing hot water supply can be suppressed, and unnecessary boiling can be suppressed, and the energy efficiency of the heat pump hot water supply apparatus 10 can be improved.

  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 10 Heat pump hot water supply device 11 Heat pump unit 12 Hot water supply unit 13 Faucet 15B Control device (control means)
16 Compressor 18 Heat Pump Heat Exchanger 19 Refrigerant Pipe 26 Hot Water Supply Tank 26A Hot Water Tank Top 26B Hot Water Tank Bottom 26C Hot Water Middle Part 27 Hot Water Heat Exchanger (Refrigerant to Water Heat Exchanger)
33 Intermediate hot water piping 34 Hot water supply circulation pump (circulation pump)
36 Hot water supply water pipe 38 First tap water pipe (tap water pipe)
40 Top hot spring piping 57 Mixing control valve 59 Hot water supply piping 62 Second tap water piping (tap water piping)

Claims (3)

A hot water tank that can store hot water,
A heat pump refrigerant circuit having at least a compressor, a heat pump heat exchanger, and a refrigerant-to-water heat exchanger, and using a refrigerant having carbon dioxide;
The water at the bottom of the hot water tank is taken out and heated with the heat of the refrigerant discharged from the compressor in the refrigerant-to-water heat exchanger, and then the heated hot water is introduced from the top of the hot water tank into the hot water tank. A hot water circulation circuit to return to
A tap water pipe that is provided at the bottom of the hot water tank and allows tap water to be supplied so that the tap water pressure always acts in the hot water tank;
A hot water supply pipe provided at the top of the hot water tank, for supplying hot water in the upper part of the hot water tank;
An intermediate hot water supply pipe that is provided at an intermediate portion between the top and bottom of the hot water tank and supplies hot water in the intermediate portion in the hot water tank,
Control means for selecting either hot water supplied through the top hot water supply piping or hot water supplied through the intermediate hot water supply piping according to the hot water temperature in the intermediate portion in the hot water storage tank;
A mixing control valve that adjusts hot water at a faucet by mixing hot water and tap water from the hot water supply pipe where the top hot water supply pipe and the intermediate hot water supply pipe are joined, and
When the hot water temperature at the intermediate portion in the hot water tank is lower than the hot water temperature required at the faucet, the hot water on the top side of the hot water tank is taken out and supplied to the hot water piping. Hot water supply device. Deriving hot water in the hot water tank from the top, circulating piping to circulate to the intermediate part of the hot water tank through a heat exchanger for bathtubs;
A water circulation circuit for a bathtub that circulates hot water or water in the bathtub to the heat exchanger for the bathtub and heats it with hot water derived from the hot water tank,
The heat pump type hot water supply apparatus according to claim 1, wherein the heating is performed when the temperature of the hot water in the bathtub is lowered to an appropriate temperature or less.   The heat pump hot water supply apparatus according to claim 2, wherein the top hot water supply pipe and the circulation pipe are independently attached to the hot water storage tank.

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