JP2009092251A - Heating/cooling and hot water supplying heat pump system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating/cooling and hot water supplying heat pump system capable of properly performing a heating operation by an indoor heat exchanger of a heat pump and rising a temperature of supplied hot water/water to a proper temperature. <P>SOLUTION: The heating/cooling heat pump is composed of a compressor 11, a four-way valve 13, the indoor heat exchanger 15, an outdoor heat exchanger 19, an expansion valve 21 and the like. A hot water supply circuit is constituted of a hot water supply tank 22, a water circulation pipe 23, a circulation pump 24 and the like. A first hot water supply heat exchanger 25 is disposed in a branch heat medium pipe 14a and the water circulation pipe 23, and a second hot water supply heat exchanger 26 is disposed in a discharge pipe 12 and the water circulation pipe 23. In a heating operation state, the supplied hot water/water in the water circulation pipe 23 is primarily heated to, for example, 50°C by utilizing latent heat of a heat medium gas passing through the branch heat medium pipe 14a by the first hot water supply heat exchanger, and secondarily heated to, for example, 80°C by sensible heat of the heat medium gas passing in the discharge pipe 12 by the second hot water supply heat exchanger 26. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air-conditioning / hot-water supply heat pump system that can perform air-conditioning and can supply hot water to, for example, a faucet and a bathtub.

  Conventionally, as a heat pump, a hot water supply heat pump dedicated to hot water supply, an air conditioning heat pump performing air conditioning, and an air conditioning / hot water heat pump performing air conditioning and hot water supply have been put into practical use. These heat pumps are configured so as to obtain a heat quantity many times as much as the input energy by taking in heat from air, water, or underground.

For a dedicated hot water supply heat pump, CO ₂ (carbon dioxide) can be used as a heating medium to produce hot hot water of, for example, 70 ° C. to 80 ° C., and R-410 can be used as the heating medium to increase the pressure. By doing so, it is possible to make hot water having a high temperature close to that of the CO ₂ heating medium. However, since this dedicated hot water supply heat pump cannot perform cooling and heating, there is a problem that a dedicated cooling and heating heat pump must be provided separately.

On the other hand, the air conditioning / hot water supply heat pump described above is configured as follows. That is, this heat pump forms a refrigeration cycle by sequentially connecting a hot water supply condenser, an expansion mechanism, and an evaporator to a heat medium circulation pipe connected to a compressor. Further, a water circulation pipe connected to the hot water supply tank is connected to the hot water supply condenser, and heat of the heat medium in the hot water supply condenser is exchanged with hot water in the water circulation pipe to heat the hot water supply water. It has become. (Patent Document 1 discloses a heat pump air-conditioning / heating water heater using a hot water condenser. See FIG. 4).
JP 61-101770 A

  However, since the conventional air conditioning / hot water heat pump uses the condensation heat temperature necessary for air conditioning, the temperature of the hot water supply rises only to about 40 to 50 ° C., which is the high temperature side condensation temperature during air conditioning. There was a problem that the range of use of water was limited. In addition, in the case of hot water of about 40 to 50 ° C., the temperature is low for hot water storage, and there is a possibility that it may be lower than the use temperature for hot water due to heat loss even for a short time, and prevent the proliferation of miscellaneous bacteria such as Legionella bacteria. Is impossible and not suitable for hot water storage.

  On the other hand, in the case of a heat pump dedicated to hot water supply, the operating temperature of the compressor is controlled to increase the condensation temperature generated in the condenser, for example, to 70 ° C. When this condition is applied to a conventional heat pump air-conditioning / heating water heater, there are the following problems. That is, when producing hot water at 70 ° C., it is necessary to operate the compressor at a high speed in order to change the condensation temperature of the heat medium gas from 40 ° C. to 70 ° C. As a result, there were the following problems. This will be described with reference to the Mollier diagram of FIG.

  The horizontal axis in FIG. 3 represents the specific enthalpy h / kj · kg, and the vertical axis represents the pressure (MPa). The square frame lines represented by (A) to (E) indicate the refrigeration cycle of the heat medium of the heat pump. In this diagram, a cycle indicated by a solid line indicates that the compressor is in a normal operation state, and refrigeration cycles (A ') to (E') indicated by a two-dot chain line indicate a state where the compressor is operated at a high speed. The discharge temperature of the compressor is usually about 70 ° C., and the specific enthalpy of the discharge heat medium gas of the compressor is 462 (h / kj · kg). In high-speed operation of the compressor, the discharge temperature of the heat medium gas is Above 100 ° C. (for example, 105 ° C.), the specific enthalpy is 480 (h / kj · kg). Therefore, even if the temperature of the hot water supply is optimized, high-speed operation of the compressor, which is not necessary for air conditioning, is forced, and the efficiency of the heat pump is reduced, resulting in a decrease in coefficient of performance (COP). Arise.

  When the heat pump is in the heating operation state in winter, when low-temperature hot water of, for example, 0 to 15 ° C. in the water circulation pipe of the hot water supply circuit enters the condenser for hot water supply, the high-temperature and high-pressure heat medium gas in the heat medium circulation pipe Due to the heat exchange with the hot water, the temperature of the heat transfer gas is excessively lowered and the indoor heating temperature becomes insufficient. In order to solve this problem, the compressor described above is forced to operate at high speed.

  The first object of the present invention is to solve the above-mentioned problems in the prior art and to appropriately perform heating operation by the heat exchanger indoor heat exchanger and heating of hot water, and coefficient of performance (COP). Is to provide a cooling / heating / hot water supply heat pump system.

  In addition to the first object, a second object of the present invention is to provide a cooling / heating / hot water heat pump system capable of appropriately heating hot water even in a cooling operation state.

  In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a four-way valve is connected to a compressor via a discharge pipe and a suction pipe, a heat medium circulation pipe is connected to the four-way valve, and the heat medium An indoor heat exchanger for air conditioning, an expansion valve and an outdoor heat exchanger are connected in series to the circulation pipe to constitute a refrigeration cycle, while a circulation pump is connected in the middle of the water circulation pipe connected to the hot water tank, With respect to the water circulation pipe and the branch heat medium pipe connected in parallel to the indoor heat exchanger with respect to the heat medium circulation pipe, hot water flowing through the water circulation pipe by the latent heat of the heat medium gas flowing through the branch heat medium pipe A first hot water supply heat exchanger for primary heating is provided, and the hot water supply water flowing through the water circulation pipe is subjected to secondary heating by the sensible heat of the heat transfer medium gas flowing through the discharge pipe with respect to the water circulation pipe and the discharge pipe. A second hot water supply heat exchanger is provided, and the branch heat medium pipe Off valve provided in the cooling operation state, and summarized in that the on-off valve is configured to be closed by a signal from the controller.

  According to the second aspect of the present invention, a four-way valve is connected to the compressor via a discharge pipe and a suction pipe, a heat medium circulation pipe is connected to the four-way valve, and an indoor heat exchange for air conditioning is connected to the heat medium circulation pipe. A refrigerating cycle is configured by connecting a heat exchanger, an expansion valve and an outdoor heat exchanger in series, while a circulation pump is connected in the middle of a water circulation pipe connected to a hot water tank, and the water circulation pipe and the indoor heat exchanger And a first hot water supply heat exchanger for primarily heating hot water flowing through the water circulation pipe by the latent heat of the heat medium gas flowing through the heat medium circulation pipe with respect to the heat medium circulation pipe between the expansion valve and the expansion valve, The gist is that a second hot water supply heat exchanger for secondary heating of hot water flowing through the water circulation pipe by sensible heat of the heat transfer medium gas flowing through the discharge pipe is provided for the water circulation pipe and the discharge pipe.

  According to a third aspect of the present invention, in the first or second aspect, a branch water circulation pipe is connected to the water circulation pipe in parallel with the first hot water supply heat exchanger via a switching valve, the branch water circulation pipe and the expansion A third hot water supply heat exchanger is connected to the heating medium circulation pipe between the valve and the outdoor heat exchanger, and the switching valve is switched during cooling operation to replace the first hot water supply heat exchanger, The gist is that the third hot water supply heat exchanger is configured to be used.

  According to a fourth aspect of the present invention, in the first or third aspect, the indoor heat exchanger is connected in series to a plurality of branch heat medium pipes connected in parallel separately from the branch heat medium pipes, The gist of the invention is that the heat medium pipe is provided with an on-off valve for selecting and using each of the indoor heat exchangers.

  According to a fifth aspect of the present invention, in the second aspect, a plurality of branch heat medium pipes are connected in parallel in the middle of the heat medium circulation pipe, and the indoor heat exchanger is connected to each branch heat medium pipe. The gist of the invention is that each branch heat medium pipe is provided with an on-off valve for selecting and using each indoor heat exchanger.

(Function)
According to the first aspect of the present invention, when the heat pump is in a heating operation state in winter, for example, hot water flowing in the water circulation pipe, for example, 0 ° C. to 15 ° C. hot water flows through the branch heat medium pipe by the first hot water supply heat exchanger. For example, primary heating is performed to 40 ° C. to 50 ° C. by the latent heat of the gas. Thereafter, hot water flows into the second hot water supply heat exchanger and is secondarily heated to, for example, 70 ° C. to 90 ° C. by the sensible heat of the heat transfer medium gas in the discharge pipe. For this reason, in the second hot water supply heat exchanger, the temperature of the heat medium gas in the heat medium pipe is properly maintained, and the indoor heating temperature by the indoor heat exchanger is appropriately maintained. Moreover, since it is not necessary to operate the compressor at high speed, the coefficient of performance of the heat pump can be improved.

  On the other hand, when the heat pump is in a cooling operation state in summer, the temperature of hot water in the water circulation pipe is relatively high, for example, 20 ° C. to 30 ° C., so that the on / off valve provided in the branch heat medium pipe is operated to By closing the heat medium piping, the temperature of the hot water entering the second hot water supply heat exchanger can be maintained at 20 ° C to 30 ° C. For this reason, in the second hot water supply heat exchanger, the temperature of the high-temperature and high-pressure heat transfer medium gas does not decrease excessively due to heat exchange with the hot water supply water, and the indoor cooling temperature by the indoor heat exchanger is appropriately maintained.

  According to the second aspect of the present invention, the hot water in the water circulation pipe is primarily heated by the first hot water supply heat exchanger using heat exhausted from the indoor heat exchanger through the expansion valve and exhausted by the outdoor heat exchanger. Therefore, waste heat can be used without waste and the coefficient of performance of the heat pump can be further improved.

  According to the third aspect of the present invention, since the hot water is primarily heated by the third hot water supply heat exchanger instead of the first hot water supply heat exchanger in the cooling operation state of the heat pump, it is discharged by the second hot water supply heat exchanger. The temperature of the heat transfer medium gas in the pipe is prevented from excessively decreasing, and the cooling operation by the indoor heat exchanger is appropriately performed.

  The invention according to any one of claims 1 to 5 can appropriately perform the heating operation by the indoor heat exchanger of the heat pump and the heating of the hot water supply, and can improve the coefficient of performance (COP). it can.

The invention according to claim 2 can further improve the coefficient of performance (COP) of the heat pump by effectively utilizing the waste heat released to the outside by the outdoor heat exchanger.
In addition to the effect of the invention described in claim 1 or 2, the invention described in claim 3 can appropriately perform heating and cooling operation of hot water supply in the cooling operation state of the heat pump.

Hereinafter, an embodiment of an air-conditioning / hot-water supply heat pump system embodying the present invention will be described with reference to FIGS.
First, an air conditioning heat pump will be described with reference to FIG. A four-way valve 13 is connected to the discharge pipe 12 and the suction pipe 18 connected to the inlet / outlet of the compressor 11 that sucks and compresses the low-temperature / low-pressure heat medium gas and discharges the high-temperature / high-pressure heat medium gas. A heat medium circulation pipe 14 is connected to the four-way valve 13. A plurality (six in this embodiment) of branched heat medium pipes 14 a to 14 f are connected in parallel in the middle of the heat medium circulation pipe 14. The indoor heat exchanger 15 is connected to each of the branch heat medium pipes 14a to 14f, leaving one branch heat medium pipe 14a. An outdoor heat exchanger 19 and an expansion valve 21 are connected to the heat medium circulation pipe 14 between the four-way valve 13 and the indoor heat exchanger 15, and a refrigeration cycle for performing a heating operation or a cooling operation is configured. Yes. In this embodiment, for example, R-410A or R-407C manufactured by Daikin Chemicals Sales Co., Ltd. is used as the heat medium.

Next, a hot water supply circuit incorporated in the air conditioning heat pump configured as described above will be described.
A water circulation pipe 23 is connected to the inlet / outlet of the hot water supply tank 22, and a circulation pump 24 is connected to the water circulation pipe 23. A first hot water supply heat exchanger 25 disposed in the room is connected to the water circulation pipe 23 so as to correspond to the branch heat medium pipe 14a. The first hot water supply heat exchanger 25 exchanges heat by transferring the latent heat of the heat transfer gas passing through the branch heat transfer medium pipe 14a to the hot water supply circulating in the water circulation pipe 23 when the heat pump is in a heating operation state. The temperature of the hot water supply water can be primarily heated, for example, from 0 ° C. to 15 ° C. to 40 ° C. to 50 ° C.

  A second hot water supply heat exchanger 26 is connected midway between the water circulation pipe 23 and the discharge pipe 12 so as to be positioned downstream of the first hot water supply heat exchanger 25 with respect to the water circulation pipe 23. The second hot water supply heat exchanger 26 is connected to the hot water in the water circulation pipe 23 that is primarily heated to 40 ° C. to 50 ° C. by the first hot water supply heat exchanger 25 when the heat pump is in a heating operation state. The sensible heat of the high-temperature and high-pressure heat transfer medium gas is transmitted and heat exchange is performed, and the temperature of the hot water supply water is secondarily heated to 70 to 90 ° C.

  The hot water supply tank 22 is supplied with a supply pipe 27 for supplying hot water, a faucet 28 for extracting hot water in the hot water supply tank 22, and the pressure when the pressure in the hot water supply tank 22 rises to a set value or more. A discharge pipe 29 for discharging and a safety valve 30 are provided.

  Each of the branch heat medium pipes 14a to 14f is connected to an electromagnetic on-off valve 31, and is selectively opened and closed as required by an open / close signal from a heat pump control device (not shown).

Next, the operation of the air conditioning / hot water supply heat pump system configured as described above will be described.
In FIG. 1, the four-way valve 13 of the air conditioning / heating heat pump is switched to the heating operation state, the electromagnetic on / off valves 31 are opened, the arrow G indicates the flow of the heat transfer medium gas of the air conditioning / heating heat pump, and the arrow W indicates hot water in the hot water supply circuit. Shows the flow. The high-temperature and high-pressure heat medium gas discharged from the compressor 11 flows from the discharge pipe 12 through the second hot water supply heat exchanger 26 and is divided into the branched heat medium pipes 14a to 14f. Heat is exchanged for heating in each room. Thereafter, the heat medium gas in each of the branch heat medium pipes 14 a to 14 f is joined to the heat medium circulation pipe 14, led to the liquid storage tank (not shown) via the expansion valve 21, and supplied to the outdoor heat exchanger 19. Is done. In the outdoor heat exchanger 19, the heat medium gas is heated by the heat of the air and is returned to the compressor 11 through the four-way valve 13 and the suction pipe 18.

  On the other hand, by the operation of the circulation pump 24 of the hot water supply circuit, hot water in the hot water supply tank 22 is first led into the first hot water supply heat exchanger 25 through the water circulation pipe 23, and heat exchange is performed by the first hot water supply heat exchanger 25. Done. Then, the hot water flowing in the water circulation pipe 23 is primarily heated from 0 ° C. to 15 ° C. to 40 ° C. to 50 ° C. by the latent heat of the heat medium gas flowing through the branch heat medium pipe 14a. Heat is exchanged with the indoor air by the first hot water supply heat exchanger 25 to heat the room, and the indoor heat exchanger 15 described above heats the room. Thereafter, the hot water in the water circulation pipe 23 primarily heated by the first hot water supply heat exchanger 25 flows into the second hot water supply heat exchanger 26, where further heat exchange is performed. And the hot-water supply water primarily heated by the sensible heat of the heat transfer medium gas flowing in the discharge pipe 12 is secondarily heated to 70 ° C. to 90 ° C. Secondary heated hot water is returned to the hot water tank 22.

  When the heating operation of the heat pump and the circulating heating operation of the hot water supply circuit are continuously performed for a predetermined time, the temperature of the hot water in the hot water tank 22 is heated to, for example, 70 ° C. to 90 ° C. and heated. After the temperature of the hot water is appropriately adjusted, it is guided to the faucet 28 of a bathtub or a sink for use.

  On the other hand, when the cooling / heating heat pump is in a cooling operation state in summer, the flow direction of the heat transfer medium gas is switched by the four-way valve 13 as shown by an arrow G as shown in FIG. The flow path direction is the same as the arrow W in FIG.

  In the cooling operation state of the cooling / heating heat pump, the electromagnetic on-off valve 31 provided in the branch heat medium pipe 14a is closed by a control signal from a control device (not shown) of the heat pump. In this state, the high-temperature and high-pressure heat medium gas discharged from the compressor 11 is supplied into the second hot water supply heat exchanger 26 through the discharge pipe 12 and is exchanged with the heat of the air by the outdoor heat exchanger 19. After being condensed by a liquid storage tank (not shown), then depressurized / expanded by the expansion valve 21 and divided into the respective branch heat medium pipes 14b to 14f, heat exchange with the heat of the air is performed by each indoor heat exchanger 15. Is done. By this heat exchange, the interior of the branched heat medium pipes 14b to 14f is cooled by the heat medium gas that has been decompressed and expanded and cooled. Thereafter, the heat medium gases provided for cooling in each of the branched heat medium pipes 14 b to 14 f are merged, led from the four-way valve 13 to the suction pipe 18, and returned to the compressor 11.

  By the way, when the heat pump is in a cooling operation state in the summer, the temperature of the hot water in the water circulation pipe 23 is relatively high, for example, 20 ° C. to 30 ° C. Therefore, as described above, the function of the first hot water supply heat exchanger 25 is achieved. The temperature of the hot water entering the second hot water supply heat exchanger 26 can be maintained at the above-described 20 ° C. to 30 ° C. For this reason, the secondary heating of the hot water by the second hot water supply heat exchanger 26 can be properly performed although it is somewhat lower than that in the heating operation state, and the temperature of the refrigerant gas in the discharge pipe 12 is too low. Therefore, the indoor cooling temperature by the indoor heat exchanger 15 is properly maintained.

According to the air conditioning / hot water supply heat pump system of the above embodiment, the following effects can be obtained.
(1) In the said embodiment, the 1st hot water supply heat exchanger 25 was provided in the said branch heat-medium piping 14a and the water circulation piping 23, and the 2nd hot water supply heat exchanger 26 was provided in the discharge piping 12 and the water circulation piping 23. And in the heating operation state of the cooling / heating heat pump, the temperature of the hot water supply is set to, for example, 0 ° C. to 15 ° C. by the latent heat of the heat transfer gas flowing in the branch heat transfer medium pipe 14a by the first hot water supply heat exchanger 25. After the primary heating from 40 ° C. to 40 to 50 ° C., the hot water heated primarily by the sensible heat of the heat transfer medium gas flowing in the discharge pipe 12 by the second hot water supply heat exchanger 26 is, for example, 70 ° C. to 90 ° C. Secondary heating was performed. As described above, since the hot water having a relatively high temperature primarily heated by the first hot water supply heat exchanger 25 is secondarily heated by the second hot water supply heat exchanger 26, heat is exchanged by the second hot water supply heat exchanger 26. The amount of sensible heat is small, the heat medium gas in the discharge pipe 12 does not condense, and at the same time, even if the indoor heat exchanger 15 is operating, the capacity of the heat pump does not deteriorate. Therefore, both the heating of the hot water and the indoor heating operation by the indoor heat exchanger 15 can be properly performed, and the compressor 11 does not need to be operated at high speed for heating of the hot water. The coefficient of performance (COP) can be improved.

  (2) In the above embodiment, when all the five indoor heat exchangers 15 are operated during the heating operation or cooling operation of the air conditioning heat pump and the overall load increases, the rotation speed of the compressor 11 is increased by the inverter of the control device. The circulation amount of the high-temperature and high-pressure heat transfer medium gas that rises and passes through the second hot water supply heat exchanger 26 can be increased. For this reason, the amount of sensible heat that can be heat-exchanged increases, and the rise in the temperature of hot water in the hot water supply circuit can be promoted. That is, it is remarkable that hot water supply water can be obtained under a cold condition with a high heating load or a high cooling load condition without causing the compressor 11 to perform an excessively high speed operation that increases power consumption (work amount). effective.

  Here, a specific operation state of the air conditioning / hot water supply heat pump system will be described with reference to the Mollier diagram and the refrigeration cycle of FIG. For heating the hot water by the first hot water supply heat exchanger 25, latent heat (condensation heat) of about 50 ° C. of the heat transfer medium gas (c) to (d) of the refrigeration cycle is used, and the second hot water supply heat exchanger Similarly, the heating water of the hot water supplied by No. 26 uses the sensible heat (superheat) at 70 ° C. of the heating medium gas (b) to (c) of the refrigeration cycle. The specific enthalpy between (b) and (d) in FIG. 3 is 237 (h / kj · kg), and the amount of heat used for hot water supply is (b) and (c) sensible heat (superheat). The ratio (%) of the specific enthalpy 37 (h / kj · kg) is 15.6%. Therefore, it was found that the heat pump according to the present embodiment has a 15.6% increase in capacity as compared with a conventional heat pump using latent heat, and contributes to a higher temperature of hot water.

  In a heating operation state of the heat pump, assuming a heat pump using a condensation temperature of 50 ° C., a ratio that can be used when supercooling to a hot water temperature of 15 ° C. at 50 ° C. of the heating medium gas (R-410A) The enthalpy is 425−225 = 200 (h / kj · kg) by subtracting the numerical value in (c) of FIG. 3 and the numerical value in (d). When this heating medium gas is squeezed and expanded by an expansion valve 21 to 0 ° C. and the evaporation medium is heated up to a condensation temperature of 50 ° C. by the compressor 11, the heating medium gas is heated to a high temperature and a high pressure. The specific enthalpy is 462 (h / kj · kg), and the discharge temperature of the compressor 11 rises to 70 ° C. Utilizing the specific enthalpy of the difference 462-425 = 37 (h / kj · kg) with respect to the condensation temperature of the discharged heat transfer medium gas, it is used for secondary heating of hot water.

  In the conventional method, when the compressor 11 is operated at a high speed, the heat transfer gas is compressed as shown in (b ') to (b') of the refrigeration cycle shown by the two-dot chain line in FIG. 3 as described in the background art. Specific enthalpy is required to be 480 (h / kj · kg). On the other hand, in the heat pump of this embodiment, since the specific enthalpy is 462 (h / kj · kg) as described above, the work amount of the compressor 11 is 480−462 = 28 (h / kj · kg). The coefficient of performance (COP) is improved.

Next, another embodiment of the present invention will be described with reference to FIG.
In this embodiment, a branch water circulation pipe 33 is connected to the water circulation pipe 23 in parallel with the first hot water supply heat exchanger 25 via an electromagnetic switching valve 32. A third hot water supply heat exchanger 34 is connected to the branch water circulation pipe 33 and the heat medium circulation pipe 14 between the outdoor heat exchanger 19 and the expansion valve 21.

  In this embodiment, in the cooling operation state, the switching valve 32 is switched to the branch water circulation pipe 33 and the third hot water supply heat exchanger 34 that bypass the first hot water supply heat exchanger 25, and the outdoor heat exchanger 19 The hot water passing through the branch water circulation pipe 33 is primarily heated from 0 ° C. to 15 ° C. to 40 ° C. to 50 ° C., for example, due to the latent heat of the condensed heat medium gas. Then, since the hot water is secondarily heated to, for example, 70 ° C. to 90 ° C. by the second hot water supply heat exchanger 26, the hot water can be appropriately heated in the cooling operation state of the heat pump.

Next, another embodiment of the present invention will be described with reference to FIG.
In this embodiment, the first hot water supply heat exchanger 25 is connected to the heat medium circulation pipe 14 and the water circulation pipe 23 between the electromagnetic on-off valve 31 and the expansion valve 21.

  In this embodiment, in the heating operation state of the heat pump, the heat exhausted to the air by the indoor heat exchanger 15 to the outdoor heat exchanger 19 can be used for primary heating of hot water in the water circulation pipe 23. Therefore, the efficiency of the heat pump can be improved and the coefficient of performance (COP) can be further improved.

Next, another embodiment of the present invention will be described with reference to FIG.
In this embodiment, in the embodiment shown in FIG. 5, the switching valve 32, the branch water circulation pipe 33, and the third hot water supply heat exchanger 34 of the embodiment shown in FIG. 4 are arranged to constitute the system shown in FIG. is doing. Therefore, in this embodiment, in the cooling operation state, the hot water is appropriately heated to an intermediate temperature, the secondary heating by the second hot water supply heat exchanger 26 is appropriately performed, and the cooling operation can be appropriately performed. The hot water can be properly heated.

  As apparent from the above description, in the air conditioning / hot water supply heat pump system of the present invention, the temperature of the heat transfer medium gas supplied to the indoor heat exchanger 15 in the heating operation state is lowered by the second hot water supply heat exchanger 26. In order to achieve this, a first hot water supply heat exchanger 25 is provided in the branched heat medium pipe 14a or the heat medium circulation pipe 14 between the four-way valve 13 and the expansion valve 21, and water circulation is achieved. Water is heated to an intermediate temperature (40 to 50 ° C.) by primary heating of water flowing through the pipe 23.

In addition, you may change the said embodiment as follows.
In the above embodiment, five indoor heat exchangers 15 are used, but this may be one, two, three, four, six, or more.

  In the above embodiment, the outdoor heat exchanger 19 using the heat of air is used, but instead of this, an outdoor heat exchanger using the heat of water is used, or an outdoor heat exchanger using the underground heat is used. It may be used.

The circuit diagram of the heating operation state which shows one Embodiment which actualized the air-conditioning and hot-water supply heat pump system of this invention. The circuit diagram of the cooling operation state of a heat pump system similarly. Mollier diagram with specific enthalpy on the horizontal axis and pressure on the vertical axis. The circuit diagram of the heating operation state which shows another embodiment which actualized the air-conditioning and hot water supply heat pump system of this invention. The circuit diagram of the heating operation state which shows another embodiment which actualized the air-conditioning and hot water supply heat pump system of this invention. The circuit diagram of the heating operation state which shows another embodiment which actualized the air-conditioning and hot water supply heat pump system of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Compressor, 12 ... Discharge piping, 13 ... Four-way valve, 14 ... Heat-medium circulation piping, 14a-14f ... Branch heat-medium piping, 15 ... Indoor heat exchanger, 18 ... Intake piping, 19 ... Outdoor heat exchanger, DESCRIPTION OF SYMBOLS 21 ... Expansion valve, 22 ... Hot water supply tank, 23 ... Water circulation piping, 24 ... Circulation pump, 25 ... 1st hot water supply heat exchanger, 26 ... 2nd hot water supply heat exchanger, 32 ... Switching valve, 33 ... Branch water circulation piping, 34 ... 3rd hot water supply heat exchanger.

Claims (5)

A four-way valve is connected to the compressor via a discharge pipe and a suction pipe, a heat medium circulation pipe is connected to the four-way valve, and an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger for air conditioning are connected to the heat medium circulation pipe. Are connected in series to form a refrigeration cycle, and on the other hand, a circulation pump is connected in the middle of a water circulation pipe connected to a hot water tank, and the indoor heat exchanger is parallel to the water circulation pipe and the heat medium circulation pipe. A first hot water supply heat exchanger for primarily heating hot water flowing through the water circulation pipe by latent heat of the heat transfer medium gas flowing through the branch heat medium pipe, and the water circulation pipe A second hot water supply heat exchanger for secondary heating of hot water flowing through the water circulation pipe by sensible heat of the heat transfer medium gas flowing through the discharge pipe is provided to the discharge pipe, and an on-off valve is provided in the branch heat medium pipe. In the cooling operation state, the on-off valve Air-hot water heat pump system, characterized by being configured to be closed by a signal from the control device. A four-way valve is connected to the compressor via a discharge pipe and a suction pipe, a heat medium circulation pipe is connected to the four-way valve, and an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger for air conditioning are connected to the heat medium circulation pipe. Are connected in series to form a refrigeration cycle, and on the other hand, a circulation pump is connected in the middle of a water circulation pipe connected to the hot water tank, and the heat medium between the water circulation pipe, the indoor heat exchanger and the expansion valve is connected. A first hot water supply heat exchanger is provided for primary heating of hot water flowing through the water circulation pipe by the latent heat of the heat transfer medium gas flowing through the heat medium circulation pipe, and the circulation pipe is connected to the water circulation pipe and the discharge pipe. An air conditioning / hot water heat pump system comprising a second hot water supply heat exchanger for secondary heating of hot water flowing through the water circulation pipe by sensible heat of the heat transfer medium gas flowing through the discharge pipe. 3. The water circulation pipe according to claim 1 or 2, wherein a branch water circulation pipe is connected in parallel to the first hot water supply heat exchanger via a switching valve between the branch water circulation pipe, the expansion valve, and the outdoor heat exchanger. A third hot water supply heat exchanger is connected to the heat medium circulation pipe, and the switching valve is switched during cooling operation to use the third hot water supply heat exchanger instead of the first hot water supply heat exchanger. An air-conditioning / hot-water supply heat pump system characterized by being configured as described above. 4. The indoor heat exchanger according to claim 1, wherein the indoor heat exchanger is connected in series to a plurality of branch heat medium pipes connected in parallel separately from the branch heat medium pipes, and each of the indoor heat exchangers is connected to each branch heat medium pipe. An on-off valve for selecting and using an exchanger is provided for an air conditioning / hot water supply heat pump system. 3. The branch heat medium pipe according to claim 2, wherein a plurality of branch heat medium pipes are connected in parallel in the middle of the heat medium circulation pipe, and the indoor heat exchanger is connected to each of the branch heat medium pipes. An air-conditioning / hot-water heat pump system characterized in that the piping is provided with an on-off valve for selecting and using each indoor heat exchanger.

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