JP2709073B2 - Cooling / heating hot water supply cycle and heating / hot water supply cycle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heating and hot water supply cycle capable of operating hot water supply and heating having greatly different temperature levels without using an auxiliary heat source.

(Prior Art) Conventionally, as a heat pump capable of coping with two types of heat loads, as shown in FIG. 17, a plurality of condensers and a plurality of compressors are combined, and a working medium passing through a first compressor 101 is used. While a part is condensed in the second condenser 104, the remaining working medium is further compressed in the second stage compressor 102 and then condensed in the first condenser 103,
There is a type in which two types of load fluids having different temperatures flow through the condenser 103 and the second condenser 104, respectively, for cooling (JP-A-60-126548).

(Problems to be Solved by the Invention) However, in this two-stage compression two-stage condensation refrigeration cycle, since the entire amount of the working medium passes through the second condenser 104,
The disadvantage is that the ratio of heat output or the temperature level between the condenser 103 and the second condenser 104 cannot be changed significantly.
In addition, since the working medium discharged from the first stage compressor is further compressed as it is by the second compressor, the amount of suction into the second compressor is reduced by the amount that the working medium expands at a temperature higher than the saturation temperature. And the compression efficiency becomes poor. Furthermore, since the degree of superheat of the working medium becomes too large, there is a possibility that an accident such as carbonization of the lubricant may occur. Also,
Since the energy of the superheated working medium discharged from the first stage compressor is not used, there is a disadvantage that the coefficient of performance is low.

Therefore, an object of the present invention is to provide a heating and hot water supply cycle capable of efficiently operating hot water supply and heating having greatly different temperature levels without an auxiliary heat source.

(Means for Solving the Problems) In order to achieve the above object, the heating and hot water supply cycle of the present invention includes a main compressor, an auxiliary compressor for further pressurizing the working medium pressurized by the main compressor, and a heat source for hot water supply. A first heat exchanger, and a first expansion valve and a third heat exchanger serving as a heat source for cooling and heating that can be selectively and arbitrarily connected to an inlet or an outlet of the main compressor to form a heat cycle. On the other hand, one end is connected between the first expansion valve and the third heat exchanger via a second expansion valve, and the other end is selectively connectable to an inlet or an outlet of the main compressor. Two heat exchangers are provided so that a heating hot water supply operation and a cooling hot water supply operation can be selectively performed.

The present invention also provides a main compressor, an auxiliary compressor that further compresses a part of the working medium compressed by the main compressor, and a heat source for heating by condensing a part of the working medium compressed by the main compressor. A first condenser,
A heat pump for condensing the working medium compressed by the auxiliary compressor and using the working medium as a heat source for hot water supply, wherein the condenser is condensed and then expanded under reduced pressure to evaporate the entire amount of the working medium in one evaporator. Is formed, and the fluid to be heated in the hot water supply system is preheated by the working medium before being sucked into the auxiliary compressor, and further heated to the hot water supply temperature by the second condenser.

The present invention also provides a first heat cycle including a main compressor, a first condenser used as a heating heat source, a gas-liquid separator, a first expansion valve, and an evaporator. An auxiliary compressor that extracts only the gas content of the working medium from the separator and further compresses the gas to obtain a high-temperature and high-pressure working medium suitable for a hot water supply heat source; a second condenser used as a hot water supply heat source; A second heat cycle is provided in which the two expansion valves and the gas-liquid separator are sequentially connected, and the working medium after being decompressed and expanded by the second expansion valve is returned to the first heat cycle.

Further, the present invention provides a method for connecting the main compressor, the first heat exchanger, the first expansion valve, the third heat exchanger, the main compressor, and either the first heat exchanger or the third heat exchanger. While a four-way switching valve that selectively connects the other side to the downstream side is connected to the upstream side to form a cooling and heating heat cycle,
Selectively connecting a gas-liquid separator downstream of the main compressor and either between the first heat exchanger and the first expansion valve or between the third heat exchanger and the first expansion valve; The auxiliary compressor that extracts and compresses only the gas component of the working medium after the gas-liquid separation into the gas-liquid separator, the second heat exchanger used as a heat source for hot water supply, and the second expansion valve are connected. A hot water supply cycle is configured to further compress and condense only a part of the gas in the compressed working medium.

Further, the present invention provides a hot water supply system using a second condenser or a heat exchanger as a heat source, a heat exchanger for preheating a fluid to be heated flowing through the hot water supply system in a gas-liquid separator, and discharges the gas from a main compressor. The heat is exchanged between the working medium and the fluid to be heated in the hot water supply system, and the preheating of the fluid to be heated in the hot water supply system and the intermediate cooling of the working medium are performed. Further, the temperature of the hot water is further increased by the second condenser or heat exchanger. Until it is heated.

(Operation) Therefore, in the present invention, the main compressor or both the main compressor and the auxiliary compressor are driven and the connection direction of the first heat exchanger, the second heat exchanger, and the third heat exchanger is switched. In addition, the flow direction and the compression state of the working medium are partially changed. Therefore, simultaneous operation and independent operation of the cooling / heating operation and the hot water supply operation at different temperature levels can be performed using one cycle.

Further, in the present invention, a part of the working medium pressurized by the main compressor is condensed in the first condenser, and the condensed heat is used as a heat source of the heater, and the heat of the superheat is consumed. On the other hand, only the gas component is extracted from the working medium that has exited the first condenser, and is further pressurized by the auxiliary compressor, and is condensed in the second condenser at a higher temperature and pressure than the working medium introduced into the first condenser. The heat of condensation is used as a heat source for the water heater.

Also, in the present invention, a part of the working medium pressurized by the main compressor is condensed in the first condenser, and the condensed heat is used as a heat source of the heater while being compressed by the main compressor. A part of the working medium is heat-exchanged with the fluid to be heated for hot water supply, intermediately cooled, and then further compressed by the auxiliary compressor. It is condensed in the vessel, and the heat of condensation is used as a high heat source of the water heater. On the other hand, the fluid to be heated in the hot water supply system is first preheated by exchanging heat with the working medium before being sucked into the auxiliary compressor, and then heated to the hot water supply temperature in the second condenser.

Further, in the present invention, a part of the working medium pressurized by the main compressor is condensed in the first heat exchanger,
The heat of condensation is used as a heat source for the heater. On the other hand, a part of the working medium compressed by the main compressor is intercooled in the gas-liquid separator, only the gas is extracted, further pressurized by the auxiliary compressor, and has a higher temperature than the working medium introduced into the first heat exchanger. -It is made high pressure and condensed in the second heat exchanger, and the condensed heat is used as a high heat source of the water heater. Further, by operating the four-way switching valve to switch the flow of the working medium, the gas working medium is caused to flow through the first heat exchanger to perform the cooling operation. Also at this time, the hot water supply cycle operates using a part of the working medium.

Further, according to the present invention, in the gas-liquid separator that connects the heating and cooling heat cycle and the hot water supply cycle, preheating of the hot water is performed by using the heat of condensation on the cooling and heating heat cycle side, and the refrigerant in the hot water supply cycle is supplied to the refrigerant. Heating can be performed.

(Example) Hereinafter, the configuration of the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 shows an embodiment of the heating and hot water supply cycle of the present invention. The heating and hot water supply cycle includes a main compressor 1, an auxiliary compressor 2 for further pressurizing the working medium pressurized by the main compressor 1, a first heat exchanger / condenser 3 as a heat source for hot water supply, and a first expansion. Valve 4 and second expansion valve 7
And a second heat exchanger 5 as an evaporator is sequentially connected to form a heat cycle. After connecting the heat exchanger 6 and compressing the working medium evaporated in the second exchanger 5 with the main compressor 1, a part of the working medium is condensed as it is in the third heat exchanger 6 and a part is further condensed by the auxiliary compressor 2. The first heat exchanger 3 is configured to pressurize and convert the gas into a high-temperature and high-pressure gas. still,
In this embodiment, the first expansion valve 4 and the second expansion valve 7 are provided between the first heat exchanger 3 and the second heat exchanger 5, and the working medium condensed in the first heat exchanger 3 is temporarily transferred to the third heat exchanger 3. After the pressure is reduced to the same pressure as the working medium passing through the heat exchanger 6, the pressure is further reduced by the second expansion valve 7 together with the working medium on the third heat exchanger 6 side. However, the present invention is not limited to this. The second expansion valve 7 or another expansion valve may be provided at a position indicated by a virtual line in FIGS. In this specification, a third port is provided between the outlet of the main compressor and the upstream side of the second heat exchanger.
Connecting the heat exchanger via the second expansion valve means that the second expansion valve 7 is interposed between the second heat exchanger 5 and the third heat exchanger 6.

As the first heat exchanger 3, the second heat exchanger 5, and the third heat exchanger 6, an indirect heat exchanger such as a fin tube heat exchanger is generally used. Is directly heated or heat is exchanged with other heat exchangers, or heat is exchanged between a heat storage agent and water for hot water supply in combination with a heat storage tank, but a direct contact heat exchanger can also be used. is there. As the direct heat exchanger, although not shown, for example, a heat storage tank in which water is stored in a heat storage tank having an insulated structure, and Freon serving as a working medium is directly blown and condensed therein.

The heat cycle configured as described above operates as follows.

The main compressor 1 and the auxiliary compressor 2 are simultaneously driven, and the working medium is changed from the main compressor 1 to the third heat exchanger 6.
→ second expansion valve 7 → second heat exchanger 5 → circulation path to main compressor 1 and main compressor 1 → auxiliary compressor 2 → first heat exchanger 3 → first expansion valve 4 → second expansion valve 7 →
A two-circulation heat pump including a second heat exchanger 5 and a circulation path flowing to the main compressor 1 is configured. A part of the working medium pressurized in the main compressor 1 is condensed in the third heat exchanger 6 and used as a heat source for heating, while a part is further pressurized in the auxiliary compressor 2 and used in the third heat exchanger. It is converted into a gas having a higher pressure and a higher temperature than the working medium flowing to the side 6 and is condensed in the first heat exchanger 3 and used as a heat source for heating the hot water.

When a hot water supply tank is used for the first heat exchanger 3 and a heat storage tank is used for the third heat exchanger 6, the water is heated to store heat as hot water for heating or high-temperature water for hot water supply. In this case, it is economical to perform heat storage using midnight power. When the heating load cannot be covered only by heat storage, the main compressor 1
Is operated to circulate the CFCs to heat the water in the third heat exchanger 6. When the hot water supply load cannot be satisfied only by the heat storage, the main compressor 2 and the auxiliary compressor 2 are operated, and the first heat exchanger 3 Warm the water to be replenished.

FIG. 2 shows an embodiment of a cooling / heating hot water supply cycle.
This cycle includes a main compressor 1, an auxiliary compressor 2 for further pressurizing the working medium pressurized by the main compressor 1, a first heat exchanger 3, a first expansion valve 4 and an inlet of the main compressor 1 or A third heat exchanger 6 that can be selectively and arbitrarily connected to the outlet is sequentially connected to form a heat cycle, while one end is connected to the first expansion valve 4 and the third heat exchanger via a second expansion valve 7. 6 and a second heat exchanger 5 whose other end can be selectively and arbitrarily connected to the inlet or outlet of the main compressor 1.

In the case of the present embodiment, the third heat exchanger 6 is connected to the main compressor 1 via branch pipes 9 each having a stop valve 8.
Are connected respectively to the inlet and outlet of the main compressor 1 by opening and closing control of a stop valve 8. Of course, a three-way valve or other flow path switching means can be employed instead of the combination of the stop valve 8.

In the case of the present embodiment, the second heat exchanger 5 is connected to an inlet and an outlet of the main compressor 1 through branch pipes 11 each having a stop valve 10, and the main compressor 1 is controlled by opening and closing the stop valve 10. The pipes are connected so that they can be selectively and arbitrarily connected to the inlet or outlet.

In the case of the present embodiment, the first expansion valve 4 and the second expansion valve 7 have a structure capable of adiabatic expansion even when they pass from either side. However, one-way expansion using a bypass or the like is employed. It is also possible to use valves. Further, in view of the control characteristics of the system, a third expansion valve may be arranged at the position of the second expansion valve indicated by a virtual line in FIG. 2 in addition to the first and second expansion valves 4 and 7.

Each of the heat exchangers 3, 5, and 6 is generally an indirect heat exchanger that performs heat exchange between air or another heat exchange fluid and a working medium, and pumps up or heats the outside air. Although the stored water is heated or heat is applied to a heat exchanger in another cycle, for example, a hot water supply cycle, a direct heat exchanger may be employed. The heat storage tank is provided with a heat exchanger on the heat utilization side, that is, a heat exchange pipe for a cooling and heating cycle, and is provided so as to extract the stored cold or warm heat.

The heat cycle configured as described above can realize various heat exchange modes by switching the flow of the working medium and selecting the drive compressor as follows.

The cooling hot water supply mode is achieved by driving the main compressor 1 and the auxiliary compressor 2 and disconnecting the second heat exchanger 5 from the circulation path, as shown in FIG. 4 (A). The working medium is main compressor 1 → auxiliary compressor 2 → first
The working medium which circulates from the heat exchanger 3 → the first expansion valve 4 → the third heat exchanger 6 → the main compressor 1 and becomes a gas of considerably high temperature and high pressure by two-stage pressurization in the main compressor 1 and the auxiliary compressor 2 Utilizing the heat of condensation, the hot-water supply water is turned into high-temperature water, while the adiabatic expanded low-temperature, low-pressure fluorocarbon liquid or gas-liquid two-phase fluorocarbon is evaporated in the third heat exchanger 6 and used as a cooling heat source.

In the cooling mode, as shown in FIG. 4 (B), the operation of the auxiliary compressor 2 is stopped, and the first heat exchanger 3 is disconnected from the circulation path, thereby changing the working medium to the main compressor 1 →
This is achieved by switching the flow path so as to flow from the second heat exchanger 5 → the second expansion valve 7 → the third heat exchanger 6 → the main compressor 1. The working medium pumps up heat in the third heat exchanger 6 and rejects heat in the second heat exchanger 5.

In the hot water supply mode, as shown in FIG. 4 (C), the main compressor 1 and the auxiliary compressor 2 are operated, and the third heat exchanger 6 is disconnected from the circulation path, so that the working medium is changed from the main compressor 1 to the auxiliary compressor. This is achieved by flowing in the order of 2 → first heat exchanger 3 → first expansion valve 4 → second expansion valve 7 → second heat exchanger 5 → main compressor 1. The heat pumped from the outside air in the second heat exchanger 5 is raised to a high temperature by two-stage pressurization, and the first heat exchanger 3 heats hot-water supply water to produce high-temperature water.

The heating and hot water supply mode is, as shown in FIG.
As in the embodiment shown in the figure, by driving both compressors 1 and 2 to divide the working medium into two, the main compressor 1 → the auxiliary compressor 2 → the first heat exchanger 3 → the first expansion valve 4 → the second expansion valve
The flow path that flows from the expansion valve 7 to the second heat exchanger 5 to the main compressor 1, and the flow that flows from the main compressor 1 to the third heat exchanger 6 to the second expansion valve 7 to the second heat exchanger 5 to the main compressor 1. This is achieved by forming a passage and two passages. Using the working medium pressurized only by the main compressor 1, the third heat exchanger 6 performs heat exchange at a medium temperature (a temperature suitable for heating), while the working medium further pressurized by the auxiliary compressor 2. , Heat exchange at a high temperature (a temperature suitable for hot water supply) is simultaneously performed in the first heat exchanger 3.

In the heating mode, as shown in FIG. 4 (E), the auxiliary compressor 2 is stopped, the first heat exchanger 3 is disconnected, and the main compressor 1 is operated, so that the main compressor 1 → the third heat exchanger 6 → the This is achieved by flowing the working medium from the second expansion valve 7 to the second heat exchanger 5 to the main compressor 1. The third heat exchanger 6 heats the air or the heat storage material / water for heating by utilizing the heat pumped from the outside air by the second heat exchanger 5.

When the third heat exchanger is configured as a hot water heat storage system for heating, it is economical if hot water is stored using midnight power and the heat is taken out through a heat exchange pipe in the tank to meet the heating load. It is. When the heating load cannot be covered only by the heat storage, the main compressor 1 is operated to circulate the working medium to heat the water in the third heat exchanger 6. When the third heat exchanger 6 is configured as a cooling regenerative heat cycle,
For example, in the case of a cold storage device that indirectly cools water and other cold storage agents, it is economical to operate similarly using midnight power.

FIG. 3 shows still another example of the cooling / heating hot water supply cycle. The multi-stage heat pump includes a main compressor 1, an auxiliary compressor 2 that further pressurizes the working medium pressurized by the main compressor 1, a first heat exchanger 3, a first expansion valve 4, and the main compressor 1. A third heat exchanger 6 which can be selectively and arbitrarily connected to the inlet or the outlet is sequentially connected to form a heat cycle, while one end is connected to the first expansion valve 4 via the second expansion valve 7 and the third heat exchanger 3. A second heat exchanger 5 which is connected between the heat exchanger 6 and the other end of which can be selectively and arbitrarily connected to the inlet or outlet of the main compressor 1; A bypass path 12 is provided to connect the heat exchanger 3 and can be arbitrarily shut off, and a means 13 for shutting off a flow path connecting the main compressor 1 and the auxiliary compressor 2 is provided.

In the case of the present embodiment, a stop valve 13 is provided as means for shutting off the connection between the main compressor 1 and the auxiliary compressor 2,
Further, although the stop valve 14 is used as a means for shutting off the bypass 12 connecting the downstream of the auxiliary compressor 2 and the third heat exchanger 3, other flow opening / closing means may be used.

In this case, a cooling / hot water supply mode, a cooling mode, a hot water supply mode, a heating / hot water supply mode, and a heating mode can be implemented as in the case of the invention shown in FIG. 4, and the main compressor 1 and the auxiliary compressor 2 are operated and connected therebetween. The working fluid supplied from the second heat exchanger 5 is blocked by the main compressor 1 and the auxiliary compressor 2
If the flow path is switched so that the working medium flows again from the third heat exchanger 6 → the second expansion valve 7 → the second heat exchanger 5, the discharge amount / time of the working medium can be reduced. Circulation volume increases,
A rapid heating mode that enables rapid heating is realized.

FIG. 5 shows another embodiment of the heating and hot water supply cycle. This heating and hot water supply cycle includes a main compressor 21 and a first condenser.
22, the gas-liquid separator 23, the first expansion valve 24, and the evaporator 25 are sequentially connected to form a first heat cycle 20, while the gas-liquid separator 23, the auxiliary compressor 26, the second condenser 27, , A second heat cycle 29 is constituted by the second expansion valve 28, only the gas in the gas-liquid separator 23 is extracted to the second heat cycle 29 side, and is further pressurized by the auxiliary compressor 26. After being condensed at 27 and expanded via the second expansion valve 28, it is returned to the first heat cycle 20.

The heating / hot water supply cycle thus configured operates as follows.

By simultaneously driving the main compressor 21 and the auxiliary compressor 26, the working medium is changed from the main compressor 21 to the first condenser 22.
Gas-liquid separator 23 → first expansion valve 24 → evaporator 25 → circulation path (first heat cycle 20) to main compressor 21 and gas-liquid separator 23 → auxiliary compressor 26 → second condenser 27 → second 2
A two-circulation heat pump including a circulation path (second heat cycle 29) flowing from the expansion valve 28 to the gas-liquid separator 23 is configured.

A part of the working medium pressurized in the main compressor 21 is condensed in the first condenser 22, and is used as a relatively medium-temperature heating heat source. The working medium is received by the gas-liquid separator 23, and only the gas at the saturation temperature is extracted to the auxiliary compressor 26 side of the second heat cycle 29. The working medium gas at the saturation temperature is further pressurized in the auxiliary compressor 26,
The gas becomes higher in pressure and temperature than the working medium flowing through the first condenser 22, and the entire amount thereof is condensed in the second condenser 27 and used as a heat source for hot water supply.

FIG. 6 shows another embodiment of the hot water supply / heating cycle. In this hot water supply / heating cycle, the second expansion valve 28 of the second heat cycle 29 of FIG. 5 is connected between the first expansion valve 24 of the first heat cycle 20 and the evaporator 25, and the second condenser 27 The condensed working medium is supplied to the evaporator of the first heat cycle 20.
Reflux directly to 25.

As a working medium, use is generally made of chlorofluorocarbon, but a non-azeotropic working medium may be used in some cases. In this case, those having a high boiling point are mainly condensed in the first condenser 22, and those having a low boiling point are extracted to the auxiliary compressor 26 side and condensed in the second condenser 27 at a higher temperature. For this reason, it can operate efficiently as a heat source with a different temperature level.

FIG. 7 is a heat cycle diagram showing one embodiment of the heating and hot water supply cycle of the present invention. The heating and hot water supply cycle includes a main compressor 31, a first condenser 32, a first expansion valve 34, and an evaporator 35.
Constitutes the heating heat cycle 40, while the first condenser
The heat exchanger 45, the auxiliary compressor 36, the second condenser 37, and the second expansion valve 38 are connected in parallel with the main compressor 31 in parallel with the main compressor 31.
The hot water supply heat cycle 41 is configured to further compress a part of the working medium compressed in the heating heat cycle 40 and condense it as a gas having a higher temperature and a higher pressure than the working medium flowing through the heating heat cycle 40. The heat exchangers 43 and 44 of the hot water supply system 42 correspond to the heat exchanger 45 and the second condenser 37 of the hot water supply heat cycle 41.
Are arranged, and a heat exchange unit that exchanges heat with the hot water supply heat cycle 41 is configured.

The heating / hot water supply cycle thus configured operates as follows.

By simultaneously driving the main compressor 31 and the auxiliary compressor 36, the working medium is changed to the main compressor 31 → the first condenser 32 →
The first expansion valve 34 → the evaporator 35 → the circulation path flowing to the main compressor 31 and the main compressor 31 → the heat exchanger 45 → the auxiliary compressor 36 → the second condenser 37 → the second expansion valve 38 → the first expansion valve 34.
→ evaporator 35 → circulation path to main compressor 31
Construct a circulation heat cycle. A part of the working medium compressed in the main compressor 31 is condensed in the first condenser 32 and used as a heating heat source, while a part of the working medium is further compressed in the auxiliary compressor 36 and
It is converted into a gas having a higher pressure and a higher temperature than the working medium flowing to the side, is condensed in the second condenser 37, and is used as a heat source for heating hot water. At this time, the fluid to be heated, such as water, circulating in the hot water supply system 42 is supplied to the heat exchanger 43 on the heat cycle side in the heat exchanger 43.
The heat is exchanged with the working medium of the single-stage compression flowing through 45 and preheated, and then the heat of condensation of the working medium of the two-stage compression condensed in the second condenser 37 is transferred in the heat exchanger 44 to be heated to the hot water supply temperature.

FIG. 8 shows another embodiment of the heating and hot water supply cycle of the present invention. This heating and hot water supply cycle includes a main compressor 31, a first condenser 32, a gas-liquid separator 33, a first expansion valve 34, and an evaporator.
35 are sequentially connected to form a heating heat cycle 40, while the gas-liquid separator 33, the auxiliary compressor 36, the second condenser 37, and the second expansion valve 38 are added to form a hot water supply heat cycle 41, Only the gas content in the liquid separator 33 is extracted, further pressurized by the auxiliary compressor 36, condensed by the second condenser 37, expanded through the second expansion valve 38, and then returned to the heating heat cycle 40 side. I have to. And the gas-liquid separator
In 33, a heat exchanger of a hot water supply system 42 using a second condenser 37 as a heat source
43 is provided so as to exchange heat between the working medium discharged from the main compressor 31 and the fluid to be heated in the hot water supply system 42. The heat exchange with the second condenser 37 is performed via the heat exchanger 44.

The heating / hot water supply cycle thus configured operates as follows.

By simultaneously driving the main compressor 31 and the auxiliary compressor 36, the working medium is changed to the main compressor 31 → the first condenser 32 →
Gas-liquid separator 33 → first expansion valve 34 → evaporator 35 → circulation path (heating heat cycle 40) to main compressor 31 and main compressor 31 → first condenser 32 → gas-liquid separator 33 → auxiliary compressor A two-circulation heat pump comprising 36 → second condenser 37 → second expansion valve 38 → gas-liquid separator 33 → first expansion valve 34 → evaporator 35 → main compressor 31 is constituted.

The working medium pressurized in the main compressor 31 uses the sensible heat of the superheated portion and the condensed heat of a part of the refrigerant gas in the first condenser 32 to serve as a relatively medium-temperature heating heat source. Thereafter, the working medium is received by the gas-liquid separator 33, and only the gas at the saturation temperature is supplied to the auxiliary compressor of the hot water supply heat cycle 41.
It is extracted to 36 side. The working medium gas at the saturation temperature is further compressed in the auxiliary compressor 36, becomes a gas having a higher pressure and a higher temperature than the working medium flowing through the first condenser 32, and becomes a second condenser 37.
, The entire amount is condensed and used as a heat source for hot water supply.
The fluid to be heated in the hot water supply system 42 heated in the second condenser 37 performs heat exchange with the working medium before being sucked into the auxiliary compressor 36 in the heat exchanger 43 installed in the gas-liquid separator 33. Since the preheating is performed, the temperature difference between the working medium and the two-stage compressed working medium is small, and the heat exchange efficiency is high.

FIG. 9 shows another embodiment of the heating and hot water supply cycle of the present invention. In this heating and hot water supply cycle, the main compressor 31, the first condenser 32, the first expansion valve 34 and the evaporator 35 are sequentially connected to form the heating heat cycle 40, while the first condenser 32
The gas-liquid separator 33 is connected in parallel with the first expansion valve 34 via a pressure reducing means, for example, a third expansion valve 39. The gas-liquid separator 33 is further connected to an auxiliary compressor 36, a second condenser 37, The two expansion valves 38 are sequentially connected, and after a part of the working medium compressed by the main compressor 31 is separated into gas and liquid, only the gas is extracted and further compressed, and the temperature and pressure of the working medium flowing through the heating heat cycle are higher than that of the working medium. A hot water supply heat cycle 41 for condensing as a gas is provided. Further, a heat exchanger 43 of a hot water supply system 42 is installed in the gas-liquid separator 33, and another heat exchanger 44 of the hot water supply system 42 is connected to a second condenser 37. And a heat exchange unit.

The heating / hot water supply cycle thus configured operates as follows.

By simultaneously driving the main compressor 31 and the auxiliary compressor 36, the working medium is changed to the main compressor 31 → the first condenser 32 →
A circulation path (heating heat cycle 40) flowing from the first expansion valve 34 to the evaporator 35 to the main compressor 31 and the main compressor 31
→ gas-liquid separator 33 → auxiliary compressor 36 → second condenser 37 →
Second expansion valve 38 → gas-liquid separator 33 → third expansion valve 39 → evaporator 35
→ A two-circulation heat pump with a circulation path (hot water supply heat cycle 41) flowing to the main compressor 31 is configured. Note that the working medium of the heating heat cycle 40 and the working medium of the hot water supply heat cycle 41 are joined after reduced pressure, and supplied to the evaporator 35.

A part of the working medium pressurized in the main compressor 31 flows to the first condenser 32 side to be condensed, and is used as a relatively medium-temperature heating heat source. In addition, a part of the working medium is received by the gas-liquid separator 33, and is preheated to the heated fluid for hot water supply flowing through the hot water supply system 42, and is intermediately cooled and gas-liquid separated.
Only the gas above the saturation temperature is extracted to the auxiliary compressor 36 side. The working medium gas at the saturation temperature is further compressed in the auxiliary compressor 36, becomes a gas having a higher pressure and a higher temperature than the working medium flowing through the first condenser 32, and is entirely condensed in the second condenser 37 and preheated as a heat source for hot water supply. The heated fluid for hot water supply is heated to the hot water supply temperature. Then, the second expansion valve
The flash gas in a gas-liquid mixed state decompressed and expanded in 38 is introduced into a gas-liquid separator 33, and further decompressed by a third expansion valve 39 to substantially the same pressure as in the heating heat cycle, thereby evaporating.
Supplied to 35.

FIG. 10 shows another embodiment. In this heating / hot water supply cycle, the outlet of the second expansion valve 38 of the hot water supply heat cycle 41 shown in FIG.
Is connected through a third expansion valve 39 between the first expansion valve 34 and the evaporator 35 so that the working medium condensed in the second condenser 37 is directly returned to the evaporator 35 of the heating heat cycle 40. It was made.

Also, as shown in FIG. 11, whether the temperature at the time of supplying the fluid to be heated in the hot water supply system 42 is the same as the discharge gas temperature of the first stage,
If the temperature is higher or if the first-stage discharge gas temperature is set to a low value and is not used as a heat source for preheating, valves 46 and 47 for shutting off the flow path to the hot water supply system 42 and the bypass flow Road 48
Is preferably provided so that the fluid to be heated can be arbitrarily blocked from flowing through the heat exchanger 43 for preheating. In this case, if the temperature of the working medium discharged from the main compressor 31 is lower than the preheating of the fluid to be heated, the flow path to the heat exchanger 43 is blocked to prevent the fluid to be heated from being cooled. vessel
Flow the fluid to be heated directly into 44.

7, 8, and 10 described above show an embodiment as a heating and hot water supply exclusive cycle, but a four-way valve selectively connected upstream and downstream of the main compressor 31 is provided in the circuit. It is also possible to make a cooling and heating hot water supply cycle by incorporating it. FIG. 13 shows an embodiment in which the heating / hot water supply cycle in FIG. 9 is replaced by a cooling / heating hot water supply cycle.

FIG. 12 shows an embodiment of the cooling / heating hot water supply cycle of the present invention. This heating and cooling hot water supply cycle consists of a main compressor 51,
The four-way switching valve 62, the first heat exchanger 52, the first expansion valve 54, and the third heat exchanger 55 are connected as shown to form a cooling / heating heat cycle 60, while the air is downstream of the main compressor 51. The liquid separator 53 is connected to the first expansion valve 54 and the third heat exchanger 55 via the pressure reducing means such as the third expansion valve 59 and the fourth expansion valve and the switching valve 63 or the first heat exchange with the first expansion valve 54. And an auxiliary compressor 56, a second heat exchanger 57, and a second expansion valve 58, which are sequentially connected to the gas-liquid separator 53. After gas-liquid separation of a part of the compressed working medium, only the gas is extracted and further compressed,
The hot water supply heat cycle 61 is configured to condense as a gas having a higher temperature and a higher pressure than the working medium flowing through the heating heat cycle. The fourth expansion valve 64 is connected between the first heat exchanger 52 and the first expansion valve 54. This bypass passage 65 is closed at the time of heating hot water supply, but is opened at the time of cooling hot water supply, and is evaporated together with the liquid working medium refluxed from the hot water supply cycle and the liquid working medium condensed by the third heat exchanger 55 to perform the first heat exchange. Table 52
Supply to the side.

The cooling / heating hot water supply cycle thus configured operates as follows.

When used as a heating and hot water supply cycle, the main compressor 51 and the auxiliary compressor 56 are simultaneously driven to change the working medium from the main compressor 51 → the four-way switching valve 62 → the first heat exchanger 52 → the first expansion valve 54 → the 3 heat exchanger 55 → four-way switching valve 62 →
The circulation path (cooling / heating heat cycle 60) flowing to the main compressor 51, the main compressor 51 → the gas-liquid separator 53 → the auxiliary compressor 56 → the second heat exchanger 57 → the second expansion valve 58 → the gas-liquid separator 53 → the 3 expansion valve 59 → third heat exchanger 55 → circulation path (hot water supply heat cycle 61) flowing to main compressor 51
Construct a circulation heat pump. Note that the working medium of the heating heat cycle and the working medium of the hot water supply heat cycle are joined after being decompressed and supplied to the third heat exchanger 55.

A part of the working medium pressurized in the main compressor 51 flows to the first heat exchanger 52 side and condenses, and is used as a relatively medium-temperature heating heat source. In addition, a part of the working medium is received by the gas-liquid separator 53, is subjected to intermediate cooling, and only a gas component having a temperature equal to or higher than the saturation temperature is extracted to the auxiliary compressor 56 side. The working medium gas at the saturation temperature is further pressurized in the auxiliary compressor 56, becomes a gas having a higher pressure and a higher temperature than the working medium flowing through the first heat exchanger 52, and is entirely condensed in the second heat exchanger 57 to serve as a heat source for hot water supply. Used. Thereafter, the flash gas in a gas-liquid mixed state decompressed and expanded in the second expansion valve 58 is introduced into the gas-liquid separator 53, and furthermore, the third expansion valve
At 59, the pressure is reduced to substantially the same pressure as in the cooling / heating heat cycle and supplied to the third heat exchanger 55.

In addition, when the cooling medium supply cycle is used, by operating the four-way switching valve 62, the flow of the working medium in the cooling / heating heat cycle 60 is changed from the main compressor 51 → the four-way switching valve 62 → the third heat exchanger 55 → The air flows from the first expansion valve 54, the first heat exchanger 52, the four-way switching valve 62, and the main compressor 51, so that a cooling cycle can be easily performed. Further, the switching valve 63 is switched so that the working medium that is recirculated through the gas-liquid separator 53 is combined with the cooling heat cycle side working medium via the fourth expansion valve 64.

The use of chlorofluorocarbon as a working medium is common, but a non-azeotropic working medium may be used. In this case, in the first heat exchanger 52, high-boiling ones are mainly condensed, and in the second heat exchanger 57, low-boiling ones are mainly condensed from a higher temperature state. It can be operated efficiently.

FIG. 13 shows an example of a cooling / heating hot water supply cycle. In this embodiment, a heat exchanger 66 of a hot water supply system 67 is arranged in the gas-liquid separator 53 of the cooling / heating hot water supply cycle shown in FIG. 12, and a fluid to be heated (normal water) flowing through the hot water supply system is preheated. Only the gas content of the working medium in 53 is extracted and further compressed to make the working medium higher in temperature and pressure than the working medium flowing through the cooling and heating cycle, and the preheated water is used as the heat source for hot water supply in the second condenser 57 using the heat of condensation. Is heated to the hot water supply temperature.
The heat exchange between the second condenser 57 and the hot water supply system 67 is performed indirectly via the heat exchanger 68 in the case of the present embodiment. The condenser 57 may be immersed to heat the fluid / water to be heated. In this case, the flow of the working medium is the same as that in FIG. 12, and the description thereof will be omitted. The preheating of the hot water in the gas-liquid separator 53 increases the heating efficiency of the hot water and increases the efficiency of the main compressor.
The working medium discharged from 51 is intercooled, and the compression efficiency of auxiliary compressor 56 is increased.

In addition, in the embodiment shown in FIGS. 1 to 10 and FIGS. 12 and 13, when heating or cooling is not used or when it is necessary to increase the amount of heat of the hot water supply heat source regardless of the time. The entire amount of the working medium that has left the main compressor is supplied to the auxiliary compressor as it is or through a gas-liquid separator or an intermediate condenser to increase the amount of heat as a heat source of the hot water supply system, that is, a dedicated hot water supply cycle. Sometimes. Further, the cycle itself can be a hot water supply exclusive cycle. For example, as shown in FIG.
The cooling / heating hot water supply cycle shown in FIG. 13 is modified and the cooling / heating cycle side includes a main compressor 51, a gas-liquid separator 53, an expansion valve 59, and an evaporator 55. In this case, a part of the working medium compressed by the main compressor 51 is partially condensed in the gas-liquid separator 53 to preheat water for hot water supply, perform intermediate cooling of the working medium, and extract only gas components to assist. The compressor 56 further compresses to create a high-temperature working medium sufficient for hot water supply and enhances hot water supply performance.

FIG. 14 shows another embodiment. In this embodiment, 2
The two heat cycles 70, 80 are connected by an indirect heat exchanger 73, and a part of the working medium discharged from the compressor 71 of one heat cycle 70 is branched from the cooling / heating cycle 81, and the other heat cycle is condensed by the heat of condensation. The working medium 80 before compression and the fluid to be heated heated by the heat cycle 80 are preheated. Specifically, the heat cycle 70 on the left side of the figure includes a cooling / heating cycle 81, and the right side configures a hot water supply cycle 80. The cooling / heating cycle 81 is piped such that the compressor 71, the first heat exchanger 72, and the second heat exchanger 75 can be selectively connected to the upstream side and the downstream side via the four-way switching valve 82, and 1 heat exchanger 72
And the second heat exchanger 75 are connected via an expansion valve 74. Further, a part of the working medium is branched by a bypass 85 between the downstream side of the compressor 71 and the four-way switching valve 82, between the second heat exchanger 75 and the expansion valve 74, and between the first heat exchanger 72 and the expansion valve 74. Are provided so as to be joined together. The bypass 85 is connected to the expansion valves 84 and 7
It is connected to a cooling / heating cycle 81 via 9. A third heat exchanger 86 constituting the indirect heat exchanger 73 and a switching valve 83 are connected to the bypass passage 85.

The hot water supply heat cycle 80 includes a compressor 76, a first heat exchanger 77, an expansion valve 78, and a second heat exchanger 88, which are sequentially connected.
A hot water supply system 89 for exchanging heat with the first heat exchanger 77
Heat exchanger 90 comprises a first heat exchanger 77 and a heat exchanger 87 for preheating.
Are provided in correspondence with the heat exchanger 86 on the first heat cycle side constituting the indirect heat exchanger 73.

According to the cooling / heating hot water supply cycle configured as above, the cooling / heating cycle 81 and the hot water supply cycle 80 are each independent, and the hot water supply cycle using heat of the compression working medium of the cooling / heating cycle 81 is used.
Since the working medium and the hot water are preheated after the expansion of 80, the type of working medium can be selected according to each specification. For example, in the cooling / heating cycle 81 and the hot water supply cycle 80, the performance can be improved by using different working media corresponding to the working temperatures.

In addition, when heating or cooling is not used or when the amount of heat of the hot water supply heat source needs to be increased irrespective of that, the entire amount of working medium that has exited the compressor 71 of the cooling / heating cycle 81 is supplied to the indirect heat exchanger 73. Then, the amount of heat as a heat source of the hot water supply system may be increased, that is, a hot water supply dedicated cycle may be used. Further, the cycle itself can be a hot water supply exclusive cycle. For example, instead of the cooling and heating cycle 81, a heating heat pump cycle or a cooling heat pump cycle in which the flow of the working medium is one-way may be incorporated.As shown in FIG. 16, the cooling and heating hot water supply cycle of FIG. 14 is modified, Compressor 71 heating cycle on left
And the third heat exchanger 86 and the expansion valve 79 that constitute the intermediate heat exchanger 73
And the second heat exchanger 75, so that the entire amount of the working medium is used to heat the working medium on the hot water supply cycle 80 side and preheat the hot water.

The above embodiment is one of the preferred embodiments, but is not limited thereto, and various modifications can be made without departing from the spirit of the present invention. For example, also
The use of chlorofluorocarbon as a working medium is common, but a non-azeotropic working medium may be used. For example, FIG.
When used in the embodiment shown in FIG. 10, the first condenser
The high-boiling one is mainly condensed at 32, and the low-boiling one is extracted to the auxiliary compressor 36 side and condensed in the second condenser 37 at a higher temperature. For this reason, it can operate efficiently as a heat source with a different temperature level. Of course, the same applies to other embodiments. In this embodiment, the heating and hot water supply cycle is performed. However, it is of course possible to set the cooling and hot water supply cycle by switching circuits.

Furthermore, in the above-described embodiment, for example, in the embodiment of FIGS. 7 to 10, two separate compressors are used as the main compressor 31 and the auxiliary compressor 36, but a multi-stage coaxial turbo compressor or during the compression stroke. A compressor that can obtain a plurality of discharge pressures with one unit, such as a compressor that performs bleeding, may be used. Of course, the same applies to other embodiments. In this case, a part of the working medium is extracted at the portion where the step changes, and is provided so as to be supplied to the hot water supply heat cycle 41 side.

(Effects of the Invention) As is clear from the above description, in the present invention, a part of the working medium pressurized by the main compressor is condensed in the third heat exchanger, and is used as a heat source for medium temperature heat exchange. Another part is further pressurized in the auxiliary compressor and condensed in the first heat exchanger and used as a heat source for high-temperature heat exchange. Therefore, a heating heat source and a hot water supply heat source having different temperature levels are combined into one heat source. Can be provided simultaneously by running the cycle.

Further, in the case of the present invention, by switching the flow direction of the working medium, the cooling hot water supply operation and the heating hot water supply operation can be performed using one cycle, and the equipment can be made compact.

In the present invention, the working medium pressurized by the main compressor is condensed in the first condenser and used as a heat source for heating at a medium temperature, while the working medium after condensation is separated into gas and liquid to assist only gas. Further pressurize in the compressor
Since it is condensed in the condenser and used as a heat source for hot water supply of high temperature heat, heat exchange with different temperature levels, that is, heating hot water heating and heating hot water heating can be operated simultaneously, and an intermediate cooling effect can be obtained. As a result, the efficiency is good, and the degree of superheat of the working medium at the compressor outlet is reduced, so that accidents such as carbonization of the lubricant can be prevented.

Also, the present invention condenses a part of the working medium pressurized by the main compressor in the first condenser and uses it as a heat source for heating medium-temperature heat, while using a part of the working medium as a heated fluid for hot water supply. After the heat exchange and pre-heating and intermediate cooling, the auxiliary compressor is further compressed and condensed in the second condenser, and the pre-heated fluid to be heated in the hot water supply system is further heated to the hot water supply temperature by utilizing the condensed heat. Therefore, heat exchange at different temperature levels, that is, heating of hot water for heating and high-temperature water for hot water supply can be efficiently performed, and the temperature level can be largely changed. In addition, the heating and hot water supply cycle has good performance efficiency because an intermediate cooling effect is obtained, and can also prevent accidents such as lubricant carbonization by reducing the degree of superheating of the working medium at the compressor outlet. Incidentally, comparing the conventional cycle shown in FIG. 17 with the cycle of the present invention shown in FIG. 7, the evaporating temperature -3 ° C. condensing temperature 70 ° C. feed water inlet temperature 7 ° C. hot water outlet temperature 65 ° C. Condensation temperature in intermediate heat exchange -5 ℃ The compression ratio of compressors 1 and 2 is the same. Adiabatic compression efficiency 0.8 Mechanical efficiency 1.0 Volumetric efficiency 0.8 Superheat degree at evaporator outlet 0 ° C Supercooling degree at condenser outlet 0 ° C Working medium R22 Output heat The result of the examination under the condition of 3000kcal / h shaft rotation speed 3000rpm is as follows.

Therefore, the present invention has a higher coefficient of performance, a lower maximum medium temperature than the conventional one, and there is no risk of lubricant aging, and the sum of the volumes of the compressors is smaller.

Further, in the present invention, a part of the working medium pressurized by the main compressor is condensed in the first heat exchanger and used as a medium-temperature heating heat source or a cooling heat source, while a part of the working medium is used as a gas source. Since the liquid is separated and only the gas is further pressurized in the auxiliary compressor and condensed in the second heat exchanger and the condensed heat is used as a heat source for hot water supply, heat exchange at different temperature levels, that is, Heating of hot water for heating and high-temperature water for hot water supply can be implemented,
In addition, the temperature level can be greatly varied. Also,
Cooling and heating can be easily switched by operating the four-way switching valve, and the hot water supply cycle can be simultaneously operated not only during heating but also during cooling. Further, the heating and hot water supply cycle has good performance efficiency because an intermediate cooling effect is obtained, and can also prevent accidents such as lubricant carbonization by reducing the degree of superheat of the working medium at the compressor outlet.

In the present invention, a hot water supply system using a second condenser or a heat exchanger as a heat source is provided, and a heat exchanger for preheating a fluid to be heated flowing through the hot water supply system is provided in a gas-liquid separator, and a main compressor is provided. Heat is exchanged between the working medium discharged from the hot water supply system and the fluid to be heated in the hot water supply system, preheating of the fluid to be heated in the hot water supply system and intermediate cooling of the working medium are performed, and further hot water is supplied by the second condenser or the heat exchanger. Since the heating is performed up to the temperature, the integration of the heat exchanger and the gas-liquid separator makes it possible to reduce the size and cost of the cooling and heating water heater. At the same time, the condensation in the gas-liquid separator enables the rapid removal of the liquid refrigerant, thereby improving the performance of the heat exchanger.

[Brief description of the drawings]

1 is a heat cycle diagram showing one embodiment of a heating and hot water supply cycle of the present invention, FIG. 2 is a heat cycle diagram showing another embodiment, and FIG. 3 is an embodiment in which the cycle of FIG. 2 is further modified. FIG. 4 is a heat cycle diagram for explaining the cycle operation state of FIG. 2, wherein (A) is a cooling and hot water supply mode, (B) is a cooling and hot water mode, (C) is a hot water supply mode, and (D) is a heat cycle diagram. The heating / hot water supply mode and (E) show the heating mode, respectively. FIG. 5 is a heat cycle diagram showing another embodiment of the heating and hot water supply cycle. FIG. 6 is a heat cycle diagram showing another example of a heating / hot water supply cycle. FIG. 7 is a heat cycle diagram showing another embodiment of the heating / hot water supply cycle. 8, 9, 10, and 11 are heat cycle diagrams showing other embodiments of the heating and hot water supply cycle, respectively. FIG. 12 is a heat cycle diagram showing another embodiment of the cooling / heating hot water supply cycle, FIG. 13 is a heat cycle diagram of another embodiment of the cooling / hot water supply cycle, and FIG. 14 is a heat cycle diagram showing another embodiment of the cooling / heating hot water supply cycle. Cycle diagram, Figures 15 and 16
FIG. 17 is a heat cycle diagram showing an embodiment of a hot water supply exclusive cycle, and FIG. 17 is a heat cycle diagram of a conventional two-stage compression two-stage condensation cycle. 1,21,31,51… Main compressor, 6,22,32,52… First condenser, 5,25,35,55,… Evaporator, 2,26,36,56… Auxiliary compressor , 3,27,37,57 ... second condenser, 43,63 ... Heat exchanger for preheating of hot water supply system. 23,33,53 …… Gas-liquid separator, 81…
... Heat cycle for heating and cooling, 80 ... Heat cycle for hot water supply.

 ──────────────────────────────────────────────────続 き Continuation of the front page Preliminary examination (56) References JP-A-63-87559 (JP, A) JP-A-63-41771 (JP, A) JP-A-62-225860 (JP, A) 62-72552 (JP, U)

Claims (4)

(57) [Claims] 1. A main compressor (31), an auxiliary compressor (36) for further compressing a part of the working medium compressed by the main compressor (31), and the main compressor (31).
A first condenser (32) for condensing a part of the working medium compressed in the step (3) to serve as a heating heat source, and the auxiliary compressor (36)
And a second condenser (37) for condensing the working medium compressed in the step (1) and using it as a heat source for hot water supply. In each of the condensers (32) and (37), the condenser is decompressed and expanded to form one evaporator (35). ) To form a heat pump that evaporates the entire amount of the working medium, preheats the fluid to be heated in the hot water supply system with the working medium before being sucked into the auxiliary compressor (36), and further supplies hot water in the second condenser (37). A heating and hot water supply cycle characterized by heating to a temperature. 2. A main compressor (31), a first condenser (32) used as a heating heat source, and a gas-liquid separator (33).
, A first expansion valve (34) and an evaporator (35) constitute a first heat cycle (40), while the gas-liquid separator (33)
(36) an auxiliary compressor (36) for extracting only the gas content of the working medium from the air and further compressing the gas to obtain a high-temperature and high-pressure working medium suitable for a hot water supply heat source, and a second compressor used as a hot water supply heat source
The condenser (37), the second expansion valve (38), and the gas-liquid separator (33) are connected in order, and the working medium that has been decompressed and expanded by the second expansion valve (38) is subjected to the first heat cycle. (40) is provided with a second heat cycle (41) for refluxing,
A hot water supply system (42) using the condenser (37) as a heat source is provided, and a heat exchanger (4) for preheating the fluid to be heated flowing through the hot water supply system (42) is provided.
3) is provided in the gas-liquid separator (33), and heat is exchanged between the working medium discharged from the main compressor (31) and the fluid to be heated in the hot water supply system (42). A preheating of the fluid to be heated and an intermediate cooling of the working medium, and further heating to the hot water supply temperature in the second condenser (37). 3. A main compressor (51), a first heat exchanger (52), a first expansion valve (54), and a third heat exchanger (55).
A four-way selector valve (41) for selectively connecting one of the main compressor (51) and the first heat exchanger (52) or the third heat exchanger (55) to the upstream side and the other to the downstream side. 62) to form a cooling / heating heat cycle (60), or between the downstream of the main compressor (51) and the first heat exchanger (52) and the first expansion valve (54) or A gas-liquid separator (53) is selectively connected to either between the third heat exchanger (55) and the first expansion valve (54), and the gas-liquid separator (53) is connected to the gas-liquid separator (53). An auxiliary compressor (56) for extracting and compressing only the gas component of the working medium after liquid separation, a second heat exchanger (57) used as a heat source for hot water supply, and a second expansion valve (58) are connected, A hot water supply cycle (61) for further compressing and condensing only a part of the gas in the working medium compressed in the main compressor (51) A cooling and heating hot water supply cycle characterized by comprising. 4. A hot water supply system (67) using the second heat exchanger (57) as a heat source, and a heat exchanger (66) for preheating a fluid to be heated flowing through the hot water supply system (67) is provided by the gas-liquid The heat exchange between the working medium discharged from the main compressor (51) and the fluid to be heated in the hot water supply system (67) is provided in the separator (53), thereby preheating the fluid to be heated in the hot water supply system (67). And intermediate cooling of the working medium, and the second heat exchanger (57) further supplies the hot water (67)
4. The cooling / heating hot water supply cycle according to claim 3, wherein the heated fluid is further heated to a hot water supply temperature.