JP2007240126A - Heat pump heat supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump heat supply system that can efficiently and appropriately execute a heat supply operation for a desired heat load without reducing the quantity of heat stored in a hot water storage tank. <P>SOLUTION: The heat pump heat supply system A comprises: a loading heat exchanger 5 supplied with hot water from an upper part of the hot water storage tank 2; and a heat pump 1 having a hot water heating heat exchanger 13 capable of heating hot water from a lower part of the hot water storage tank 2 and returning it to the hot water storage tank 2, and a hot water-refrigerant heat exchanger 15 capable of heating a refrigerant by means of the heat of hot water supplied from an intermediate height region of the hot water storage tank 2. A hot water circulation circuit C1 can be set in which the loading heat exchanger 5, hot water-refrigerant heat exchanger 15 and hot water heating heat exchanger 13 are connected in series by piping, and the hot water heated by the hot water heating heat exchanger 13 is circulated back to the hot water heating heat exchanger 13 via sequential supply to the loading heat exchanger 5 and hot water-refrigerant heat exchanger 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat pump heat supply used to supply heat to a desired heat load such as a floor heating terminal or a heat exchanger for bath remedy using hot water heated using a heat pump. About the system.

  As is well known, the heat pump heat supply system, for example, boils hot water using electricity in the late-night electricity rate discount time zone, and then stores this hot hot water in a hot water storage tank, and then as necessary. Generally, hot water is discharged from a hot water storage tank. On the other hand, the hot water stored in the hot water storage tank is not only used after being mixed with water and temperature-adjusted but then flowing out directly to a kitchen tap, etc., and sent to a thermal load such as a floor heating terminal. Sometimes used. In this case, the hot water whose temperature has been lowered due to the heat load is returned to the hot water storage tank and reused. However, this hot water is medium-temperature water that is inconvenient to use, and if this medium-temperature water is supplied to the heat pump as it is and heated, the coefficient of performance (COP) of the heat pump will deteriorate.

  Therefore, conventionally, there are means described in Patent Documents 1 to 3, for example, as means for preventing the problems associated with the medium-temperature water as described above. In the means described in these documents 1 to 3, a hot water-refrigerant heat exchanger for heating the refrigerant using the heat of hot water is incorporated in the heat pump. And in patent document 1, by supplying middle temperature water to the hot water-refrigerant heat exchanger from the intermediate | middle height area | region in a hot water storage tank, the temperature of this hot water is lowered | hung to low temperature water, and this is returned to a hot water storage tank. ing. In Patent Document 2, the hot water supplied to the hot water-refrigerant heat exchanger and converted into low temperature water is heated by a heat pump without returning to the hot water storage tank as it is, and then returned to the upper part of the hot water storage tank as high temperature water. . In Patent Document 3, medium-temperature water generated by being sent to a thermal load is supplied to a hot water-refrigerant heat exchanger, and the temperature of this hot water is lowered before returning to the lower part of the hot water storage tank. According to the means described in these Patent Documents 1 to 3, it is possible to prevent a large amount of unusable medium-temperature water from accumulating in the hot water storage tank. Moreover, since the refrigerant | coolant of a heat pump can be heated using the heat | fever of middle temperature water, the efficiency of a heat pump can also be improved.

  However, the means described in Patent Documents 1 to 3 still have points to be improved as described below.

  That is, when the user actually uses the heat pump heat supply system, there are various demands on how to use the hot water. For example, even if hot water in the hot water tank is full, the hot water in the hot water tank should not be reduced so that the hot water in the hot water tank is not reduced because the hot water is scheduled to be used in large quantities thereafter. Sometimes you want to use floor heating. In addition, there is a case where it is desired to immediately start floor heating using hot water after the hot water in the hot water storage tank has been used up. On the other hand, in each of the means described in Patent Documents 1 to 3, hot water stored in a hot water storage tank is used when heat is supplied to the heat load. Specifically, high temperature water is discharged from the upper part of the storage tank and supplied to a heat load. In this case, it is not possible to accurately meet the above-mentioned demand for performing floor heating without using hot water in the hot water storage tank.

  As a means for meeting the demand, when floor heating or the like is desired, hot water is not discharged from a hot water storage tank, but a heat pump is driven in real time, and hot water heated by the heat pump is supplied to a heat load. It is possible. However, simply by driving the heat pump and supplying hot water to the heat load in this way, the hot water tank remains full, so the hot water after being supplied to the heat load is stored in the hot water tank. I can't let you. Therefore, it is difficult to treat the residual heat of the hot water so that it can be used effectively thereafter, and this is a problem. In addition, it may be difficult to increase the coefficient of performance simply by operating the heat pump as usual.

JP 2005-69608 A Japanese Patent Laid-Open No. 2004-211986 JP 2004-108597 A

  The present invention has been conceived under such circumstances, and efficiently and appropriately performs a heat supply operation for a desired heat load while not reducing the amount of heat stored in the hot water storage tank. An object of the present invention is to provide a heat pump heat supply system that can be used.

  In order to solve the above problems, the present invention takes the following technical means.

  The heat pump heat supply system provided by the present invention receives a hot water supply from a hot water storage tank and the upper part of the hot water storage tank, and supplies the hot water heat to a desired heat load, or is itself a heat load. A load heat exchanger, and a hot water heating heat exchanger that is supplied with hot water from the lower part of the hot water storage tank and that can be returned to the hot water storage tank after the hot water is heated by the heat of the refrigerant, And a heat pump having a hot water-refrigerant heat exchanger that is supplied with hot water from an intermediate height region of the hot water storage tank and that can heat the refrigerant by using the heat of the hot water. A heat exchanger for load, a hot water / refrigerant heat exchanger of the heat pump, and a hot water heating heat exchanger are connected in series via a pipe, and the hot water heating heat exchanger is a system Accordingly, a hot water circulation circuit that circulates the heated hot water so that it is sequentially supplied to the load heat exchanger and the hot water-refrigerant heat exchanger and then returned to the hot water heating heat exchanger can be set. It is characterized by being.

  In the present invention, when the hot water circulation circuit is set, a certain amount of hot water existing in the piping constituting the hot water circulation circuit circulates and circulates in this circuit. In this circulation process, hot water is generated by heating the hot water heating heat exchanger, and this high temperature water is continuously and repeatedly supplied to the load heat exchanger. Therefore, it is possible to appropriately supply heat to the heat load without reducing the amount of heat stored in the hot water storage tank. Further, in the circulation process, the intermediate temperature water generated by being supplied to the load heat exchanger is sent to the hot water-refrigerant heat exchanger of the heat pump, and the residual heat is used for heating the refrigerant. Further, since the medium temperature water is used for refrigerant heating to become low temperature water and then returned to the hot water heating heat exchanger of the heat pump, the heating efficiency in the hot water heating heat exchanger is also increased. Therefore, the residual heat of the hot water after being supplied to the load heat exchanger is not wasted, and an effect of increasing the coefficient of performance of the heat pump can be expected. Therefore, according to the present invention, it is preferable to appropriately deal with a case where it is desired to efficiently and appropriately perform a heat supply operation for a heat load such as a heating terminal without reducing the amount of heat stored in the hot water storage tank. be able to.

  In a preferred embodiment of the present invention, as the hot water circulation circuit different from the hot water circulation circuit, the hot water flowing out from the lower part of the hot water storage tank is supplied to the hot water heating heat exchanger of the heat pump and heated. The hot water circulation circuit in which the operation of returning to the intermediate height region of the hot water storage tank through the load heat exchanger is repeatedly executed can be switched and set.

  According to such a configuration, as a method for supplying hot water to the load heat exchanger, for example, low temperature water flows out from the lower part of the hot water storage tank, and the low temperature water is heated by the heat pump, and then the heat for load is used. It is possible to execute a method of supplying to the exchanger. Also by such a system, it is possible to appropriately supply heat to the heat load. Moreover, although the hot water in the hot water storage tank is used, since the hot water sent to the load heat exchanger is returned to the hot water storage tank, the amount of heat stored in the hot water storage tank can be increased. Therefore, when the amount of heat stored in the hot water storage tank is relatively small, and it is desired to increase the amount of stored heat, system operation that meets such demands becomes possible.

  In a preferred embodiment of the present invention, the heat pump includes a refrigerant evaporator, a compressor, and a thermal expansion valve, and the hot-water / refrigerant heat exchanger is disposed downstream of the evaporator and in the compressor. It is provided upstream or in parallel with the evaporator.

  According to such a configuration, it is possible to appropriately prevent a problem that freezing occurs in the hot water / refrigerant heat exchanger. That is, unlike the above configuration, for example, when a hot water-refrigerant heat exchanger is provided upstream of the evaporator in the refrigerant flow direction, the temperature of the refrigerant in that portion is very low, and the hot water-refrigerant heat exchanger is located inside the hot water-refrigerant heat exchanger. There is a risk of freezing. On the other hand, according to the said structure, such a fear is eliminated appropriately.

In a preferred embodiment of the present invention, an upper pipe, a lower pipe, and an intermediate height pipe each having one end connected to an upper part, a lower part, and an intermediate height part of the hot water storage tank,
One end is connected to the lower pipe, and the other end is connected to the upper pipe via a first direction switching valve, and a liquid feed pump is provided, and hot water received from the lower pipe is supplied to the heat pump. A hot water heating pipe capable of sequentially leading to the hot water heating heat exchanger and the first direction switching valve, one end connected to the first direction switching valve, and the other end of the hot water heating pipe A hot water return pipe connected to a position upstream of the liquid feed pump in the hot water flow direction via a second direction switching valve, and a middle portion of the pipe being connected to the intermediate height pipe. The hot and cold water return pipe is connected to the hot water-refrigerant heat exchanger and the first hot water led from the hot water heating pipe to the first directional control valve after being led to the load heat exchanger. 1st hot water which leads sequentially to 2 direction switching valves It is configured to be switchable between a distribution state and a second hot water distribution state in which the hot water is led to the intermediate heat pipe without being led to the hot water-refrigerant heat exchanger after being led to the load heat exchanger. Yes.

  According to such a configuration, it is possible to freely switch and set any of the above-described two hot water circulation circuits by switching the first and second directional control valves. In addition, regardless of which of the two types of hot water circulation circuits described above, the hot water circulation operation can be performed using only one liquid feed pump, and the number of liquid feed pumps can be reduced. Can also be obtained.

  In a preferred embodiment of the present invention, a bypass path connecting an upstream part and a downstream part of the hot water / refrigerant heat exchanger in the hot / cold water return pipe, the bypass path, and the hot water / refrigerant heat exchanger. And a third directional control valve that can be switched between prevention and release of hot water flow into each of the above.

  According to such a configuration, a state where hot water is supplied to the hot water-refrigerant heat exchanger and a state where hot water is not supplied can be switched freely. For example, when the temperature of hot water supplied to the hot water-refrigerant heat exchanger is not significantly different from the temperature of the refrigerant to be heat exchanged, the effect of heating the refrigerant using hot water is low. In such a case, it is possible to reduce the flow path resistance by reducing the flow path resistance by reducing the flow path resistance by guiding the hot water to the bypass path and bypassing it. The third direction switching valve can also serve as a valve for switching between a state where hot water flowing through the hot water return pipe is guided to the intermediate height pipe of the hot water storage tank and a state where the hot water is not guided.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of a heat pump heat supply system to which the present invention is applied. As shown in the figure, the heat pump heat supply system A of this embodiment includes a heat pump 1, a hot water storage tank 2, and a load heat exchanger 5. This system A is capable of setting first and second hot water circulation circuits C1 and C2 shown in FIGS. 2A and 2B as means for supplying hot water to the load heat exchanger 5. However, this point will be described later.

  The load heat exchanger 5 is a heat exchanger for supplying heat to one or a plurality of heat loads 4 such as a bathroom dryer or a floor heating terminal. Although a heat exchanger for bath bath heating can also be the heat load 4, in this case, the load heat exchanger 5 can be used as it is as a heat exchanger for bath bath heating. Accordingly, the load heat exchanger 5 itself may become a heat load. The load heat exchanger 5 is connected to a heat load connecting pipe section 39 having a liquid feed pump P1, and the heat load 4 is connected to the pipe section 39 via an appropriate adapter 40. .

The heat pump 1 has, for example, an evaporator 11 for absorbing atmospheric heat, a compressor 12, a hot water heating heat exchanger 13 as a condenser, a thermal expansion valve 14 on a circulation flow path of a refrigerant such as CO ₂ , and the like. A hot water-refrigerant heat exchanger 15 is provided. The evaporator 11 is provided with a fan 10 attached thereto. The hot water-refrigerant heat exchanger 15 is provided between the evaporator 11 and the compressor 12, and heats the refrigerant going to the compressor 12 after passing through the evaporator 11 with medium-temperature water to be described later. It helps to produce low temperature water by lowering the temperature of medium temperature water. The basic heat pump cycle of the heat pump 1 is the same as that of the conventional one, and details thereof are omitted.

  The hot water storage tank 2 is for storing hot water heated by the heat pump 1, and has a substantially cylindrical shape extending in the vertical direction (vertical direction) or other appropriate shape. One end of each of the upper pipe 30a, 30a ', the lower pipe 30b, and the intermediate height pipe 30c for allowing the hot water to flow in and out of the upper and lower parts of the hot water storage tank 2 and the intermediate height parts thereof. Is connected. A pipe 32 to which a water supply pipe 31 such as a water pipe is connected is connected to the other end of the lower pipe 30b so that water supplied from the water supply pipe 31 enters the hot water storage tank 2 from below. It has become. The upper pipe 30a ′ is a pipe for sending out hot water toward a hot water tap (not shown) installed in the kitchen, washroom, or other place. In the hot water storage tank 2, when the on-off valve V1 provided in the upper pipe 30a 'is opened, water is introduced into the lower part of the hot water storage tank 2 and hot water in the hot water storage tank 2 is supplied to the upper pipe 30a'. It has come to leak. This hot water is mixed with water separately flowing through the branch pipe 32a at a predetermined ratio in the mixing valve V2, adjusted to the target temperature, and sent to the hot water supply destination.

  One end of a hot water heating pipe 33 is also connected to the other end of the lower pipe 30b. This hot water heating pipe 33 is essentially a pipe for sending hot water flowing out from the lower part of the hot water storage tank 2 by the operation of the liquid feed pump P2 to the hot water heating heat exchanger 13 of the heat pump 1 for heating. is there. The other end of the hot water heating pipe 33 is connected to the other end of the upper pipe 30a via a three-way valve V3. One end of a hot and cold water return pipe 34 that passes through the load heat exchanger 5 is also connected to the three-way valve V3. The other end of the hot water return pipe 34 is connected to a portion of the hot water heating pipe 33 upstream of the liquid feed pump P2 in the hot water flow direction via a three-way valve V4. However, the other end of the intermediate height pipe 30c is connected to the middle part of the hot and cold water return pipe 34, and a three-way valve V5 is provided in the downstream part of the hot water flow direction. One path 34a branched from the three-way valve V5 is a path that passes through the hot water-refrigerant heat exchanger 15, and the other one path 34b blocks hot water supply to the hot water-refrigerant heat exchanger 15. It is a bypass route for.

  Next, the usage example and effect | action of the heat pump heat supply system A are demonstrated with reference to FIG. 2 and FIG. Of the piping parts in these figures, the part indicated by the thick line is the part where hot water flows.

  In this system A, when hot water is supplied to the load heat exchanger 5 and heat is supplied to the heat load 4 such as a bathroom dryer, the first and second shown in FIGS. 2 (a) and 2 (b) are used. 2 hot water circulation circuits C1 and C2 can be switched and set. The first hot water circulation circuit C1 shown in FIG. 2 (a) is configured such that a hot water heating pipe 33 and a hot water return pipe 34 are connected in series in a closed circuit via three-way valves V3, V4. The hot water is not circulated with the hot water storage tank 2. When the first hot water circulation circuit C1 is set, when the liquid feed pump P2 is driven, a certain amount of hot water existing in the piping of the circuit C1 circulates and circulates in the circuit C1. During the circulation, hot water heated by the hot water heating heat exchanger 13 of the heat pump 1 is sequentially sent to the load heat exchanger 5 and the hot water-refrigerant heat exchanger 15 and then hot water heating heat exchange. The operation of returning to the container 13 again is continuously repeated.

  At the time of the above operation, first, the hot water heated by the hot water heating heat exchanger 13 is sent to the load heat exchanger 5 to become intermediate hot water. This intermediate hot water is the hot water-refrigerant heat exchanger 15. The residual heat is used for heating the refrigerant. In addition, due to this, the intermediate temperature water undergoes a temperature drop to become low temperature water, and this low temperature water is sent to the hot water heating heat exchanger 13. Therefore, although the heat pump 1 is operated and the heat supply operation is performed without using the hot water in the hot water storage tank 2, the heat efficiency is good. If it sets to such an operation state, the hot water in the hot water storage tank 2 will not be used. Therefore, for example, when there is not enough hot water in the hot water storage tank 2 or if there is enough hot water, the intended use of the hot water has already been determined. It is suitable when you do not want to use it.

  Depending on the operating conditions of the system A, the temperature of the hot water supplied to the hot water-refrigerant heat exchanger 15 is not significantly different from the temperature of the refrigerant that has passed through the evaporator 11, and heat exchange is performed between them. However, there may be a situation where the refrigerant heating effect cannot be expected so much. In such a case, the hot water is prevented from being supplied to the hot water-refrigerant heat exchanger 15 by switching the three-way valve V5 to flow the hot water into the bypass path 34b. In this way, since the flow path length of the hot and cold water return pipe 34 can be substantially shortened and the pipe flow path resistance can be reduced, the burden on the liquid feed pump P2 is reduced.

  The second hot water circulation circuit C2 shown in FIG. 2 (b) has a lower pipe 30b, a hot water heating pipe 33, a part of the hot water return pipe 34, and an intermediate height pipe 30c connected in series in a closed circuit shape. It is configured. In order to connect a part of the hot and cold water return pipe 34 and the intermediate height pipe 30c, the upstream part of the three-way valve V5 may be set in a closed state. The three-way valve V5 is provided not only for switching control between the path 34a and the bypass path 34b but also for setting the second hot water circulation circuit C2, and is rational. When the second hot water circulation circuit C2 is set, when the liquid feed pump P2 is driven, hot water flows out from the lower part of the hot water storage tank 2 to the lower pipe 30b and the hot water heating pipe 33, and heat exchange for hot water heating is performed. Heated by the vessel 13. The heated hot water is sent to the load heat exchanger 5 and then returned to the intermediate height region in the hot water storage tank 2 through the intermediate height pipe 30c.

  According to such an operation, since the hot water-refrigerant heat exchanger 15 is not used, the efficiency of the heat pump 1 may be reduced as compared with the case shown in FIG. As in the case of FIG. 2A described above, it is possible to appropriately supply heat to the heat load 4 even when a large amount of high-temperature water does not exist in the hot water storage tank 2. On the other hand, during this operation, the medium-temperature water generated by being sent to the load heat exchanger 5 is returned to the hot water storage tank 2, so that the amount of heat stored in the hot water storage tank 2 increases. Therefore, this operation is optimal when it is desired to increase the amount of heat stored in the hot water storage tank 2 at the same time that heat is supplied to the heat load 4.

  In the heat pump heat supply system A, since the first and second hot water circulation circuits C1 and C2 as described above can be arbitrarily selected and set, the system operation according to the user's request becomes possible. As described above, when the first and second hot water circulation circuits C1 and C2 are compared, the efficiency of the heat pump 1 is better when the first hot water circulation circuit C1 is set. Therefore, for example, when heat is supplied to the heat load 4, the first hot water circulation circuit C1 is basically set, and the second hot water circulation circuit is exceptionally set by a user's switch operation or the like. It can be configured such that C2 is set. Of course, these can be switched and set by control of a control unit using a CPU or the like. For example, when the heat storage amount of the hot water storage tank 2 is a predetermined amount or more, the first hot water circulation circuit C1 is set. May be configured such that the second hot water circulation circuit C2 is set.

  In the heat pump heat supply system A, an operation of boiling hot water in the hot water storage tank 2 can be performed as shown in FIGS. 3A and 3B, for example, in addition to the above-described operation. That is, in the operation shown in FIG. 2A, the hot water flowing out from the lower part in the hot water storage tank 2 is heated by the hot water heating heat exchanger 13 of the heat pump 1 and then returned to the upper part in the hot water storage tank 2. Such an operation is performed when the amount of heat stored in the hot water storage tank 2 is very small and the amount of heat stored in the hot water storage tank 2 is greatly increased by using a late-night electricity bill discount time zone or the like. In the operation shown in FIG. 2B, hot water in the intermediate height region in the hot water storage tank 2 is sent to the hot water / refrigerant heat exchanger 15 of the heat pump 1 and then sent to the hot water heating heat exchanger 13. After being heated, it is returned to the upper part of the hot water storage tank 2. Such an operation is performed when a large amount of so-called medium-temperature water is accumulated in the intermediate height region in the hot water storage tank 2 and when the intermediate temperature water is boiled to a high temperature to increase the amount of heat stored in the hot water storage tank 2. Further, in this operation, the heat of the heat pump 1 is heated using the heat of the medium-temperature water, and the hot water that has become low-temperature water is heated by the hot water heating heat exchanger 13 to improve the thermal efficiency. Is possible.

  4 (a) and 4 (b) show another example of a heat pump used in the present invention. In these drawings, elements that are the same as or similar to those in the above embodiment are given the same reference numerals as in the above embodiment.

  In the configuration shown in FIG. 4A, a hot water / refrigerant heat exchanger 15 is provided in parallel with the evaporator 11. More preferably, in the refrigerant circulation path of the heat pump 1, direction switching that allows switching between a state in which the refrigerant flows through both the hot water / refrigerant heat exchanger 15 and the evaporator 11 and a state in which only the evaporator 11 flows. A valve V6 is provided. Also with the configuration of the present embodiment, the refrigerant can be heated using the heat of hot water, and low temperature water can be generated by lowering the temperature of the hot water. Further, unlike the case where the hot water / refrigerant heat exchanger 15 is provided upstream of the evaporator 11, it is avoided that the temperature of the hot water / refrigerant heat exchanger 15 becomes extremely low, and the inside freezes. Is prevented. This is an effect obtained even when the hot water-refrigerant heat exchanger 15 is provided downstream of the evaporator 11 in the previous embodiment.

  In the configuration shown in FIG. 4B, the hot water / refrigerant heat exchanger 15 is integrated with the evaporator 11, so that they are provided in parallel. Even with such a configuration, an effect similar to that of the above-described embodiment can be obtained. Further, the heat pump 1 can be reduced in size by integration. The hot water-refrigerant heat exchanger 15 is not necessarily a liquid-type heat exchanger, and the liquid sent to the evaporator is heated by using the heat of hot water- An air-type heat exchanger may be used.

  The present invention is not limited to the embodiment described above. The specific configuration of each part of the heat pump heat supply system according to the present invention can be varied in design in various ways.

  The present invention efficiently performs hot water supply to a load heat exchanger using a hot water-refrigerant heat exchanger and a hot water heating heat exchanger of a heat pump without reducing the amount of heat stored in the hot water storage tank. However, as a specific piping structure constituting the hot water circulation circuit, a structure different from the above-described embodiment can be used. is there. The heat pump can be configured to use heat other than atmospheric heat. The specific structure, type, number, etc. of the heat load and the load heat exchanger are not limited.

It is explanatory drawing which shows typically one Embodiment of the heat pump heat supply system to which this invention was applied. (A), (b) is explanatory drawing which shows typically the specific example of operation | movement of the heat pump heat supply system shown in FIG. (A), (b) is explanatory drawing which shows typically the specific example of operation | movement of the heat pump heat supply system shown in FIG. (A), (b) is principal part explanatory drawing which shows the other structural example of the heat pump used in this invention.

Explanation of symbols

A heat pump heat supply system C1, C2 first and second hot water circulation circuits (hot water circulation circuit)
P2 Liquid feed pump V3 Three-way valve (first direction switching valve)
V4 Three-way valve (second direction switching valve)
V5 three-way valve (third direction switching valve)
DESCRIPTION OF SYMBOLS 1 Heat pump 2 Hot water storage tank 4 Thermal load 5 Load heat exchanger 11 Evaporator 12 Compressor 13 Heat exchanger for hot water heating 14 Thermal expansion valve 15 Hot water-refrigerant heat exchanger 30a Upper piping 30b Lower piping 30c Middle height piping 33 Hot water heating pipe 34 Hot water return pipe 34b Bypass path

Claims (5)

A hot water storage tank,
A load heat exchanger that receives supply of hot water from the upper part of the hot water storage tank and supplies the heat of the hot water to a desired heat load, or is itself a heat load;
A hot water heating heat exchanger that is supplied with hot water from a lower part of the hot water storage tank and that is heated by the heat of the refrigerant and then returned to the hot water storage tank, and an intermediate height of the hot water storage tank A heat pump having a hot water-refrigerant heat exchanger that receives supply of hot water from an area and can heat the refrigerant using heat of the hot water;
A heat pump heat supply system comprising:
The load heat exchanger, the hot water-refrigerant heat exchanger of the heat pump, and the hot water heating heat exchanger are connected in series via a pipe, and the hot water heated by the hot water heating heat exchanger is used for the load. A heat pump heat characterized by being configured to be able to set a hot water circulation circuit that is circulated so that it is sequentially supplied to the heat exchanger and the hot water-refrigerant heat exchanger and then returned to the hot water heating heat exchanger. Supply system.   As a hot water circulation circuit different from the hot water circulation circuit, hot water flowing out from the lower part of the hot water storage tank is supplied to the hot water heating heat exchanger of the heat pump and heated, and then passes through the load heat exchanger. The heat pump heat supply system according to claim 1, wherein the hot water circulation circuit in which the operation of returning to the intermediate height region of the hot water storage tank is repeatedly performed can be switched and set.   The heat pump includes a refrigerant evaporator, a compressor, and a thermal expansion valve, and the hot water-refrigerant heat exchanger is provided downstream of the evaporator and upstream of the compressor, or the evaporator The heat pump heat supply system according to claim 1 or 2, provided in parallel. An upper pipe, a lower pipe, and an intermediate height pipe each having one end connected to an upper part, a lower part, and an intermediate height part of the hot water storage tank;
One end is connected to the lower pipe, and the other end is connected to the upper pipe via a first direction switching valve, and a liquid feed pump is provided, and hot water received from the lower pipe is supplied to the heat pump. A hot water heating heat exchanger and a hot water heating pipe capable of being sequentially led to the first direction switching valve;
One end is connected to the first direction switching valve, and the other end is connected to a position upstream of the liquid feed pump in the hot water flow direction via the second direction switching valve in the hot water heating pipe. A hot water return pipe connected to the intermediate height pipe in the middle of the pipe, and
The hot and cold water return pipe includes the hot water and the refrigerant heat exchanger and the second direction after the hot water led from the hot water heating pipe to the first direction switching valve is led to the load heat exchanger. A first hot water circulation state that is sequentially guided to the switching valve; and a second hot water circulation state that is guided to the intermediate height pipe without being led to the hot water-refrigerant heat exchanger after the hot water is led to the load heat exchanger. The heat pump heat supply system according to any one of claims 1 to 3, wherein and can be switched and set. Of the hot and cold water return piping, a bypass path connecting the upstream portion and the downstream portion of the hot water-refrigerant heat exchanger,
A third directional control valve that is switchable to prevent and release the flow of hot water into each of the bypass path and the hot water-refrigerant heat exchanger;
The heat pump heat supply system according to claim 4, further comprising:

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