CN101063553B - Heat pump hot water supply device and hot water supply method thereof - Google Patents

Abstract

An object of the present invention is to provide a heat pump type hot water supply device with a small decrease in COP even when heat exchange is performed using a circulation circuit. The device includes a first hot water storage tank (2), a second hot water storage tank (4), and a heat pump type heating source (10), and the low temperature water discharged from the above hot water storage tank passes through the low temperature water side piping (13) The high-temperature water heated by the heat exchanger is supplied to the heat exchanger (11) of the heat pump type heating source, and the high-temperature water flows into the first hot water storage tank and the second hot water storage tank through the high-temperature water side piping. And, the high-temperature water heated by the heat exchanger is selectively stored in one of the first hot water storage tank and the second hot water storage tank.

Description

Heat pump hot water supply device and hot water supply method thereof

technical field

The present invention relates to, for example, a heat pump type hot water supply device and a hot water supply method thereof.

Background technique

Conventional heat pump hot water supply devices employ a method of storing warm water in a hot water storage tank at low electricity prices at night and using the warm water during the day (for example, refer to Patent Document 1). Also, the warm water stored in the hot water storage tank is supplied and used at its original temperature, or mixed with tap water to obtain warm water of an appropriate temperature for supply and use.

Also, in the heat pump hot water supply device having a circulation path, warm water is also used in the hot water storage tank as a heat source for heat exchange. For heat exchange, some have a heat exchanger installed in the hot water storage tank, and some have installed a heat exchanger independently of the hot water storage tank (outside the hot water storage tank).

By means of the heat exchange through the circulation passage, continued heating of bath water, floor heating, etc. are performed, and the stored warm water can be effectively used. Then, the lukewarm water that becomes low temperature is used as a heat source such as bath water reheating, and is returned to the original hot water storage tank by a pump.

Moreover, if the temperature of the warm water in the hot water storage tank falls below a predetermined temperature, it will be boiled again by a heat pump, or the temperature will be increased by using an auxiliary heater installed on the hot water storage tank.

Patent Document 1: Japanese Unexamined Patent Publication No. 2005-164154.

Recently, the use of heat pump hot water supply devices using natural refrigerants has increased due to concerns about energy saving and the environment, and the heat pump hot water supply devices themselves have been increasingly diversified. For its additional function, can enumerate the continuous heating of bath water, ground heating etc. as mentioned above.

These additional functions, by designing a circulation function on the heat pump hot water supply device for heat exchange, reduce the use of energy such as electricity as much as possible. However, since the warm water that has become low temperature used in the additional function is returned to the original hot water storage tank again, there is a disorder of the temperature gradient layer (stratification) of the warm water in the hot water storage tank, or due to local The problem of interruption of hot water or reduction of COP (energy consumption efficiency) due to temperature rise, etc., cannot fully exert the energy-saving effect.

Especially in the case of a heat pump hot water supply device for business use, if the above-mentioned circulation function is used for instant hot water supply, continuous heating of bath water, floor heating, etc., so that warm water flows out immediately when the faucet is turned on, it can be used as a heat source The amount of warm water used will be very large. Therefore, if the circulation function realized by the above-mentioned existing method is used, the above-mentioned problems will become prominent.

Contents of the invention

An object of the present invention is to provide a heat pump type hot water supply device with a small decrease in COP even when heat exchange is performed using a circulation circuit.

The present invention is a heat pump hot water supply device and a hot water supply method thereof in order to solve the above-mentioned problems. In the heat pump hot water supply device of the present invention, the first hot water storage tank and the second hot water storage tank have The circulation path of the water-side piping and the high-temperature water-side piping is connected to the heat pump heating source, and the low-temperature water discharged from the hot water storage tank is supplied to the heat exchanger of the heat pump heating source through the low-temperature water-side piping, and is absorbed by the heat pump. The high-temperature water heated by the exchanger flows into the above-mentioned hot water storage tank through the high-temperature water side piping, wherein the high-temperature water heated by the above-mentioned heat exchanger is selectively stored in the above-mentioned hot water storage tank by a switching mechanism.

In the heat pump hot water supply device of the present invention, the first hot water storage tank and the second hot water storage tank are connected to the heat pump heating source through a circulation path having a low-temperature water-side pipe and a high-temperature water-side pipe, and the above-mentioned hot water The low-temperature water discharged from the storage tank is supplied to the heat exchanger of the heat pump heating source through the low-temperature water-side piping, and the high-temperature water heated by the heat exchanger flows into the above-mentioned hot water storage tank through the high-temperature water-side piping. In the switching mechanism of the aforementioned circulation path, the warm water heated by the aforementioned heat exchanger is selectively stored in the aforementioned hot water storage tank, and a flow regulating mechanism is provided on the aforementioned circulating path, and the flow regulating mechanism controls the flow through the aforementioned circulation path. The flow rate of the warm water in the passage makes warm water of a predetermined temperature be respectively stored in each hot water storage tank.

In the heat pump type hot water supply device of the present invention according to the above aspect, preferably, the low temperature water side piping is connected to the low temperature water side first branch pipe connected to the first hot water storage tank and the first branch pipe connected to the first hot water side through the switching valve. 2. The second branch pipe on the low-temperature water side connected to the hot water storage tank; the above-mentioned high-temperature water side piping is connected to the first branch pipe on the high-temperature water side connected to the above-mentioned first hot water storage tank and the above-mentioned second hot water side pipe through the above-mentioned switching valve. The second branch pipe on the high temperature water side connected to the storage tank.

In addition, it can also be designed that the above-mentioned first hot water storage tank of the above-mentioned heat pump hot water supply device is provided with a plurality of hot water storage tanks arranged in series through pipes, and each hot water storage tank is provided with a detection device stored in each hot water storage tank. The temperature sensor of the hot water temperature in the storage tank stops the hot water storage operation when the preset temperature sensor detects the set temperature.

It may also be designed that the second hot water storage tank of the heat pump hot water supply device of the present invention is provided with a circulation path for circulating warm water in the second hot water storage tank.

Alternatively, the second hot water storage tank of the heat pump hot water supply device of the present invention may be configured such that warm water supplied to the external heat exchanger is returned thereto.

The heat pump hot water supply method of the present invention is a heat pump hot water supply method using the above-mentioned heat pump hot water supply device, wherein the flow regulating mechanism is controlled so that a small amount of warm water flows through the heat exchanger and the circulation path to be boiled. Operate so that the above-mentioned first hot water storage tank is used as a hot water storage tank for hot water supply, and by controlling the above-mentioned flow regulating mechanism, a large amount of warm water flows through the above-mentioned heat exchanger and the above-mentioned circulation path, thereby storing the temperature ratio The above-mentioned first hot water storage tank is low in temperature water so that the above-mentioned second hot water storage tank is used as a heat storage layer.

In the heat pump hot water supply method of the above scheme, it may also be designed such that in the above-mentioned first hot water storage tank, an interface between boiling high-temperature water and non-boiling low-temperature water, that is, a temperature gradient layer is formed, and the temperature gradient layer is formed in the above-mentioned heat exchanger. And the hot water is stored while flowing a small amount of warm water in the above-mentioned circulation passage, so as not to destroy the temperature gradient layer, and a plurality of temperature sensors for detecting the above-mentioned temperature gradient layer whose position changes with the storage amount of boiling high-temperature water are provided. , when the preset temperature sensor detects the set temperature, the boiling operation will be stopped.

In addition, the heat pump type hot water supply method of the present invention may also be designed such that in the above-mentioned first hot water storage tank, an interface between boiling high-temperature water and non-boiling low-temperature water, that is, a temperature gradient layer is formed. A small amount of warm water flows through the above-mentioned circulation channel while storing hot water so as not to destroy the temperature gradient layer, and a plurality of temperature sensors for detecting the above-mentioned temperature gradient layer whose position changes with the storage amount of boiling high-temperature water are provided, When the preset temperature sensor detects the set temperature, the boiling operation is stopped, and the switching mechanism is used to switch. Warm water for heat storage is stored in both the exchanger and the circulation path, and the hot water storage operation is stopped when the sensor provided on the second hot water storage tank detects a predetermined temperature.

The heat pump hot water supply method of the present invention can also be designed to set the priority of using the warm water in the first hot water storage tank or the second hot water storage tank, and give priority to the specific setting of operation.

Furthermore, the heat pump hot water supply method of the present invention can also be designed to use a single heat pump heating source without mixing with water to perform hot water release and hot water storage control at various temperatures.

According to the present invention, it is possible to suppress the decrease in COP even in a system including heat pump hot water supply devices of various circulation circuits.

Description of drawings

Fig. 1 is a schematic diagram showing an embodiment of a heat pump hot water supply device according to the present invention.

Fig. 2 is a schematic diagram showing an embodiment using the heat pump hot water supply device on the first hot water storage tank side.

Fig. 3 is a schematic diagram showing an embodiment using the heat pump hot water supply device on the second hot water storage tank side.

Fig. 4 is a flow chart when the first hot water storage tank is prioritized.

Fig. 5 is a flow chart when the second hot water storage tank is prioritized.

Fig. 6 is a schematic diagram showing another embodiment of the present invention.

Detailed ways

One embodiment of the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of the heat pump hot water supply device of the present invention. FIG. 1 is a schematic diagram showing a heat pump hot water supply device. The heat pump hot water supply device 1 includes: a first hot water storage tank 2, a second hot water storage tank 4, and a heat pump heating source (heat source machine) that circulates hot water at a predetermined temperature to the two hot water storage tanks 2 and 4. )10.

The heat source machine 10 is constructed by sequentially connecting a compressor (not shown), a heat exchanger 11 , an expansion valve (not shown), an evaporator (not shown), and the like. Furthermore, an inflow pipe 13 and an outflow pipe 14 are connected to the heat exchange passage 12 constituted by the heat exchanger 11 . The low temperature water from the first hot water storage tank 2 and the second hot water storage tank 4 flows through the inflow piping (low temperature water side piping) 13 and is heated by the heat exchanger 11 . The heated high-temperature water flows through an outflow pipe (high-temperature water side pipe) 14 and is appropriately supplied to the first hot water storage tank 2 and the second hot water storage tank 4 .

The inflow pipe 13 is provided with a pump P1 and a water proportional valve (flow regulating valve) 15 as a flow regulating mechanism for regulating the amount of water flowing through the inflow pipe 13 . By controlling the amount of water with the water proportional valve 15, the temperature of the warm water supplied from the heat source machine 10 can be set, for example, the hot water proportional valve 15 can be fully opened to generate warm water. In addition, the flow regulating mechanism may also be a variable flow regulating pump, and is not particularly limited.

The first hot water storage tank 2 is composed of a plurality of hot water storage tanks, and the second hot water storage tank 4 on the low temperature side is composed of a single hot water storage tank. As the first hot water storage tank 2 , five first to fifth hot water storage tanks 2 a to 2 e are illustrated.

The top of the first hot water storage tank 2a is connected to the bottom of the second hot water storage tank 2b by a connecting pipe 3a, and the top of the second hot water storage tank 2b is connected to the bottom of the third hot water storage tank 2c by a connecting pipe 3b. The top of the third hot water storage tank 2c is connected to the bottom of the fourth hot water storage tank 2d by a connecting pipe 3c, and the top of the fourth hot water storage tank 2d is connected to the bottom of the fifth hot water storage tank 2e by a connecting pipe 3d. That is, the first to fifth hot water storage tanks 2a to e are in a state of being arranged in series.

A water supply pipe 5 capable of supplying external tap water or the like is connected to a lower portion of the first hot water storage tank 2 a via a pressure reducing valve 6 . Also, a branch pipe 5a is branched from the water supply pipe 5, and the branch pipe 5a is connected to the above-mentioned inflow pipe 13 through a switching valve (three-way valve) 7 as a switching mechanism. The low temperature water side first branch pipe 9 is constituted by the water supply pipe 5 and the branch pipe 5a.

Between the bottom of the second hot water storage tank 4 and the three-way valve 7, a second branch pipe 8 on the low-temperature water side is connected. Then, by switching the three-way valve 7, the inflow pipe 13 selectively communicates with the low-temperature water side first branch pipe 9 on the first hot water storage tank 2a side and the low-temperature water side second branch pipe 8 on the second hot water storage tank 4 side. one of.

The outflow pipe 14 has a pair of branch pipes 18 and 19 branched by a three-way valve 17 . A first branch pipe 18 on the high-temperature water side is connected to the top of the fifth hot water storage tank 2e, and another second branch pipe 19 on the high-temperature water side is connected to the top of the second hot water storage tank 4. By switching such a three-way valve 17 , high-temperature water of a predetermined temperature heated by the heat source unit 10 is selectively supplied to one of the first hot water storage tank 2 and the second hot water storage tank 4 .

A hot water outflow path (hot water outflow pipe) 20 is connected to the top of the fifth hot water storage tank 2e. The hot water outflow passage 20 is provided with a constant water volume valve 21 , a mixing valve 22 for mixing warm water and tap water in the hot water outflow passage 20 , and the like.

A heat exchange circulation path (circulation path) 25 for reheating the hot water in the bathtub 33 is connected to the second hot water storage tank 4 . The heat exchange circulation passage 25 includes: an outflow passage 28 through which hot water flows out from the top of the second hot water storage tank 4 to the heat exchange passage 27 of the external heat exchanger 26; The inflow passage 30 on the lower side of the water storage tank 4 . The above-mentioned hot water outflow channel 20 is connected to the outflow channel 28 so that the hot water in the first hot water storage tank 2 can be supplied to faucets in the kitchen or the like, showers in the bathroom, and the bathtub 33 .

The inflow passage 30 is provided with a circulation pump P2 for circulating warm water in the second hot water storage tank 4 through the heat exchange circulation passage 25 .

The circulation passage 35 for continuing heat is connected to the bath 33 . That is, the reheating circulation path 35 includes an outlet pipe 36 and a return pipe 37 connected to the bathtub 33 , and the outlet pipe 36 and the return pipe 37 are connected through the heat exchange passage 38 of the heat exchanger 26 . Moreover, the pump P3 for circulation is provided in the outlet pipe 36. As shown in FIG. The outflow passage 28 and the inflow passage 30 are connected to a bypass pipe 40 via a three-way valve 39 .

In addition, a drain pipe 41 is connected to each tank of the first hot water storage tank 2 and the bottom of the second hot water storage tank 4 .

Temperature sensors T1 to T6 for detecting the temperature of hot water in each tank are arranged at predetermined positions on the respective hot water storage tanks 2a to 2e. In addition, a temperature sensor T7 is disposed on the second hot water storage tank 4 . Then, the heat source unit 10, the three-way valves 7, 17, the pumps P1-P3, the water proportional valve 15, etc. are controlled based on the hot water temperature detected by the temperature sensors T1-T7.

Next, the operation of the heat pump hot water supply device configured as described above will be described.

In the case of storing warm water in the first hot water storage tank 2, as shown in FIG. The valve 17 and the first branch pipe 18 flow into the top of the fifth hot water storage tank 2e as indicated by arrow A. The high-temperature water (hot water) flowing into the fifth hot water storage tank 2e is sequentially supplied to the connection piping 3d, the fourth hot water storage tank 2d, the connection piping 3c, the third hot water storage tank 2c, the connection piping 3b, the second hot water storage tank 2c, and the second hot water storage tank 2c. The water storage tank 2b, the connecting pipe 3a, and the first hot water storage tank 2a.

The low-temperature water flowing out from the bottom of the first hot water storage tank 2a flows into the heat source unit 10 through the first branch pipe 9 on the low-temperature water side, the three-way valve 7 and the inflow pipe 13, and circulates to the fifth hot water storage tank 2e again after being heated. , high-temperature water (for example, hot water at approximately 90° C.) can be stored in each of the hot water storage tanks 2 a to 2 e. At this time, the water proportional valve 15 is controlled so that a predetermined amount of warm water flows. At this time, in the first hot water storage tank 2, a temperature gradient layer is formed at the interface between boiling high-temperature water and low-temperature water. In order not to destroy the temperature gradient layer, hot water is stored while circulating a small amount of warm water. Boiling operation.

When using the high-temperature water in the first hot water storage tank 2, hot water flows out through the hot water outflow passage 20 connected to the top of the fifth hot water storage tank 2e as indicated by arrow B in FIG. 2 . Using the water pressure of the tap water supplied from the water supply pipe 5 to the first hot water storage tank 2a, hot water flows out through the hot water outflow passage 20 from a hot water supply mechanism 34 such as a kitchen faucet or a shower in a bathroom. Moreover, tap water is replenished from the bottom of the first hot water storage tank 2a from the water supply pipe 5 as indicated by arrow C.

In the case of storing heat in the warm water in the second hot water storage tank 4, as shown in FIG. 14. The three-way valve 17 and the high temperature water side second branch pipe 19 flow into the top of the second hot water storage tank 4 as indicated by arrow D. The low-temperature water discharged from the bottom of the second hot water storage tank 4 flows into the heat source unit 10 through the second branch pipe 8 on the low-temperature water side, the three-way valve 7 and the inflow pipe 13, and is heated and supplied to the second hot water storage tank 4 again. Warm water at a predetermined temperature (for example, hot water at approximately 50 to 60° C.) can be stored in the second hot water storage tank 4 .

When the warm water in the second hot water storage tank 4 is used as a heat source to continue heating the bath 33, when the circulation pump P2 is driven, as indicated by the arrow E, the top side of the second hot water storage tank 4 The high-temperature water flows from the outflow passage 28 to the heat exchange passage 27, and flows back from the heat exchange passage 27 to the second hot water storage tank 4 through the inflow passage 30.

Also, when the circulation pump P3 of the circulation passage 35 for continuing heat is driven, the hot water in the bath 33 flows from the outlet pipe 36 to the heat exchange passage 26 as shown by arrow F, and passes through the return water pipe 37 from the heat exchange passage 26. The flow returns to the bath 33 . Therefore, such a heat exchange function can be used to perform the continuous heating operation of the bath water, that is, to heat the hot water in the bathtub 33 .

Also, when the hot water supply mechanism 34 uses warm water in the second hot water storage tank 4, the three-way valve 39 can be switched to allow the high-temperature water on the top side of the second hot water storage tank 4 to flow through the bypass from the outflow passage 28. Pipe 40 and circulation. Therefore, hot water at a predetermined temperature can always be instantly supplied from the hot water supply mechanism 34 .

Next, a case where priority is set according to the frequency of use (capacity) of stored hot water in the first hot water storage tank 2 and the second hot water storage tank 4 will be described with reference to FIGS. 4 and 5 . FIG. 4 shows a case where the first hot water storage tank 2 is given priority, and FIG. 5 shows a case where the second hot water storage tank 4 is given priority.

In addition, the hot water storage time refers to, for example, a predetermined time between 10:00 p.m. and 8:00 a.m. when late-night power is available. In addition, T1 to T7 shown in the figure represent hot water temperatures detected by the respective temperature sensors T1 to T7.

When the first hot water storage tank 2 is given priority (when the hot water supply of the first hot water storage tank 2 is given priority)

First, as shown in FIG. 4, it is judged whether it is within the hot water storage time (S1). If it is within the hot water storage time, in the state where the heat source machine 10 is stopped (S2), the sensor T2 of the second hot water storage tank 2b detects the temperature in the first hot water storage tank 2 (second hot water storage tank 2b). temperature (S3). When T2 is below the predetermined temperature, switch the three-way valve 7 and the three-way valve 17 to the priority setting (S4), start the heat source machine 10 (S5), and heat up the first hot water storage tank 2. Switching to the priority setting refers to switching the three-way valve 7 and the three-way valve 17 to the side where the hot water in the first hot water storage tank 2 is circulated.

When T1 and T2 reach the predetermined temperature (S7), it is further judged whether T7 of the second hot water storage tank 4 is the lower limit set temperature α1 (for example, about 50°C) (S8). In addition, the heat of the first hot water storage tank 2 The water temperature is detected by the temperature sensors T1 and T2 of the first hot water storage tank 2a and the second hot water storage tank 2b. The position of the temperature sensors T1 and T2 on the downstream side when the temperature of the first hot water storage tank 2 is raised takes into account the temperature gradient layer of the warm water in the first hot water storage tank 2, and it can be judged that the temperature sensors T1 and T2 are on the upstream side ( The fifth hot water storage tank 2e side) stores high-temperature water at a predetermined temperature (for example, about 90° C.).

When it is judged that the hot water temperature of the second hot water storage tank 4 has not reached the lower limit set temperature α1, it switches to the non-priority side setting (S9). Here, switching to the non-priority setting refers to switching the three-way valve 7 and the three-way valve 17 to the side where the warm water in the second hot water storage tank 4 is circulated.

When the temperature of the second hot water storage tank 4 is raised, if it is judged that T2 is below the predetermined temperature (S11), then switch to the priority setting (S12), and return to S6 to raise the temperature of the first hot water storage tank 2.

In the state where the first hot water storage tank 2 maintains a predetermined hot water temperature, the temperature of the hot water in the second hot water storage tank 4 is raised to the upper limit set temperature α3 (for example, about 60° C.) (S13), and then the heat source machine 10 is turned off. , switch to the priority side.

If it is outside the hot water storage time, it is judged whether T4 of the fourth hot water storage tank 2d is a predetermined temperature (S15). When T4 is below the predetermined temperature, switch to the priority setting (S16), and raise the temperature of the first hot water storage tank 2 to the predetermined temperature (S17). Here, the warm water is detected by the temperature sensor T4 of the fourth hot water storage tank 2d to prevent interruption of the hot water in the first hot water storage tank 2 . That is, by hot water supply, the warm water in the first hot water storage tank 2 is used appropriately, and tap water flows through the water supply pipe 5 to supply the first hot water from the lower part of the first hot water storage tank 2a at a position downstream of the temperature sensor T4. Therefore, just before the high-temperature water of the fifth hot water storage tank 2e is used, high-temperature water flows into the fifth hot water storage tank 2e to prevent interruption of hot water.

Then, when T7 of the second hot water storage tank 4 is lower than the lower limit set temperature α1 (S18), the setting is switched to the non-priority side (S19), and the temperature of the second hot water storage tank 4 is raised. When the temperature of the second hot water storage tank 4 is raised, if it is judged that T4 is below the predetermined temperature (S20), then switch to the priority setting (S21), and return to S17 to raise the temperature of the first hot water storage tank 2.

Then, when T7 of the second hot water storage tank 4 reaches the middle set temperature α2 (for example, about 55°C) (S22), if it is outside the hot water storage time, the heat source machine 10 will be turned off (S23), if it is in During the hot water storage time, switch to the priority setting (S24).

In addition, the T7 of the second hot water storage tank 4 is set at the middle set temperature α2 for the purpose of heat storage, so as to prepare for the continuous heating of the bath 33, and supply warm water with the most suitable temperature for continuous heating quickly and without hot water interruption. .

Next, the case where the second hot water storage tank 4 is set to be given priority (priority to continue heating) will be described.

First, as shown in FIG. 5, it is judged whether it is within the hot water storage time (S1). If it is within the hot water storage time, then in the state where the heat source machine 10 is stopped, T7 of the second hot water storage tank 4 is detected (S2), and when T7 is below the lower limit set temperature α1, switch to the priority setting (S3 ), start the heat source machine 10, and heat up until T7 reaches the upper limit set temperature α3 (S4). Here, switching to the priority setting refers to switching the three-way valve 7 and the three-way valve 17 to the side where the hot water in the second hot water storage tank 4 is circulated.

Then, when T2 of the first hot water storage tank 2 is lower than a predetermined temperature (S5), the setting is switched to the non-priority side (S6), and the temperature of the first hot water storage tank 2 is raised. Switching to the non-priority side setting refers to switching the three-way valve 7 and the three-way valve 17 to the side where the hot water in the first hot water storage tank 2 is circulated. In addition, when T7 exceeds the lower limit set temperature α1 in S2, it transfers to S5.

When T7 exceeds the lower limit set temperature α1 (S7), it is judged whether T1 and T2 are predetermined temperatures (S8), if T1 and T2 are predetermined temperatures, then the heat source machine 10 is turned off, and the setting is switched to the priority side. In addition, when it is judged in S7 that T7 of the second hot water storage tank 4 is lower than the lower limit set temperature α1, it switches to the priority setting (S9) to raise the temperature of the second hot water storage tank 4 .

If it is outside the hot water storage time, when T7 of the second hot water storage tank 4 is below the lower limit set temperature α1 (S11), switch to the priority setting (S12), and raise the temperature until the temperature of the second hot water storage tank 4 T7 reaches middle set temperature α2 (S13).

Then, when T4 of the fourth hot water storage tank 2d is below a predetermined temperature (S14), it is switched to the non-priority setting (S15), and the temperature of the first hot water storage tank 2 is raised. When the first hot water storage tank 2 heats up, if the T7 of the second hot water storage tank 4 falls below the lower limit set temperature α1 (S16), switch to the priority setting (S17), return to S13, and make the second hot water The water storage tank 4 heats up.

When T7 exceeds the lower limit set temperature α1, the temperature in the first hot water storage tank 2 is raised (S18) until T2 and T4 reach the predetermined temperature.

In the heat pump hot water supply device constructed above, although there is one heat pump circuit, since the hot water storage tanks are divided into multiple groups, warm water of different temperatures can be stored by controlling the three-way valves for each outlet water temperature.

Moreover, although there is only one heat pump circuit, it can control the outlet and storage of warm water at different temperatures.

Also, even when the hot water in the second hot water storage tank 4 is used as a heat source to continue heating the bath 33, warm water is not returned to the first hot water storage tank 2, so the first hot water will not be disturbed. The temperature gradient layer of the warm water in the storage tank 2 will not affect the supply of hot water.

Moreover, since the warm water in the first hot water storage tank 2 and the second hot water storage tank 4 is controlled by the temperature sensor provided on each hot water tank, the amount of warm water in each hot water storage tank for use can be ensured sufficiently.

The present invention is not limited to the above-mentioned embodiment, and the number and capacity of the tanks of the first hot water storage tank 2 and the second hot water storage tank 4 can be appropriately and freely changed and designed according to usage conditions. For example, as shown in FIG. 6, the first hot water storage tank 2 and the second hot water storage tank 4 may be constituted by a plurality of tanks 2a, 2b and 4a, 4b, respectively.

In addition, the above exemplifies the case where the second hot water storage tank 4 is used for continuing heating of bath water, but it can also be used as a heat source such as floor heating. In the case of such floor heating, by circulating the high-temperature water on the top side of the second hot water storage tank 4 through the bypass pipe 40 from the outflow passage 28, stable warm water can be utilized.

Claims (14)

1. A heat pump type hot water supply device, the first hot water storage tank and the second hot water storage tank are connected to a heat pump type heating source through a circulation path having a low-temperature water side pipe and a high-temperature water side pipe, and the above-mentioned hot water The low-temperature water discharged from the storage tank is supplied to the heat exchanger of the heat pump heating source through the low-temperature water-side piping, and the high-temperature water heated by the heat exchanger flows into the above-mentioned hot water storage tank through the high-temperature water-side piping, wherein The high-temperature water heated by the heat exchanger is selectively stored in the hot water storage tank by a switching mechanism. 2. The heat pump hot water supply device according to claim 1, wherein: The above-mentioned switching mechanism is arranged on the above-mentioned circulation path, and a flow regulating mechanism is arranged on the above-mentioned circulation path, and the flow regulating mechanism controls the flow rate of the warm water flowing through the above-mentioned circulation path, so that hot water of a predetermined temperature is respectively stored in each hot water storage tank. warm water. 3. The heat pump hot water supply device according to claim 1, wherein the low temperature water side piping is connected to the low temperature water side first branch pipe connected to the first hot water storage tank and the low temperature water side pipe through the switching mechanism. The second branch pipe on the low-temperature water side connected to the second hot water storage tank; the high-temperature water side piping is connected to the first branch pipe on the high-temperature water side connected to the first hot water storage tank and connected to the second branch pipe through the switching mechanism. The second branch pipe on the high temperature water side connected to the hot water storage tank. 4. The heat pump hot water supply device according to claim 2, wherein the low temperature water side piping is connected to the low temperature water side first branch pipe connected to the first hot water storage tank and the low temperature water side pipe through the switching mechanism. The second branch pipe on the low-temperature water side connected to the second hot water storage tank; the high-temperature water side piping is connected to the first branch pipe on the high-temperature water side connected to the first hot water storage tank and connected to the second branch pipe through the switching mechanism. The second branch pipe on the high temperature water side connected to the hot water storage tank. 5. The heat pump hot water supply device according to claim 1, wherein a plurality of hot water storage tanks are arranged in series in the first hot water storage tank through piping, and a detection device is installed on each hot water storage tank. The temperature sensor for the temperature of hot water stored in each hot water storage tank stops the circulation of hot water in the first hot water storage tank when a preset temperature sensor detects a set temperature. 6. The heat pump hot water supply device according to claim 2, wherein a plurality of hot water storage tanks are arranged in series in the first hot water storage tank through piping, and a detection device is installed on each hot water storage tank. The temperature sensor for the temperature of hot water stored in each hot water storage tank stops the circulation of hot water in the first hot water storage tank when a preset temperature sensor detects a set temperature. 7. The heat pump hot water supply device according to claim 1, wherein a circulation path for circulating warm water in the second hot water storage tank is provided in the second hot water storage tank. 8. The heat pump hot water supply device according to claim 2, wherein a circulation path for circulating warm water in the second hot water storage tank is provided in the second hot water storage tank. 9. The heat pump hot water supply device according to claim 7, wherein the second hot water storage tank is supplied to an external heat exchanger used as a heat source for hot water heating in the bath or floor heating. The warm water returns to the structure through the above-mentioned circulation path. 10. The heat pump hot water supply device according to claim 8, wherein the second hot water storage tank is supplied to an external heat exchanger used as a heat source for continuous heating of hot water in the bath or floor heating. The warm water returns to the structure through the above-mentioned circulation path. 11. A heat pump hot water supply method using the heat pump hot water supply device according to claim 2, characterized in that the flow regulating mechanism is controlled to make a small amount of warm water flow through the heat exchanger and the circulation path to boil Operate so that the above-mentioned first hot water storage tank is used as a hot water storage tank for hot water supply, and by controlling the above-mentioned flow regulating mechanism, a large amount of warm water flows through the above-mentioned heat exchanger and the above-mentioned circulation path, thereby storing the temperature ratio The warm water in the first hot water storage tank is low so that the second hot water storage tank can be used as a heat storage layer. 12. The heat pump hot water supply method according to claim 11, characterized in that, in the first hot water storage tank, an interface between boiling high-temperature water and non-boiling low-temperature water, that is, a temperature gradient layer is formed. The hot water is stored while a small amount of warm water flows through the heat exchanger and the circulation passage so as not to destroy the temperature gradient layer. 13. The heat pump hot water supply method according to claim 11, characterized in that, in the first hot water storage tank, an interface between boiling high-temperature water and non-boiling low-temperature water, that is, a temperature gradient layer is formed. A small amount of warm water flows through the heat exchanger and the above-mentioned circulation channel while storing hot water, and then the switching mechanism is used to switch. Warm water for heat storage is stored in the heat exchanger and the above-mentioned circulation path at the same time so as not to destroy the temperature gradient layer. 14 . The heat pump hot water supply method according to claim 11 , characterized in that a single heat pump heating source is used without mixing with water to perform hot water discharge and hot water storage control at various temperatures. 15 .

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