JP5517544B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner, and more particularly to an air conditioner that drives a compressor with an internal combustion engine and collects and uses waste heat of the internal combustion engine.

In recent years, air conditioners that perform air conditioning by driving a compressor in an internal combustion engine (gasoline engine, gas engine, etc.) and circulating a refrigerant while changing phase in a refrigeration circuit have been developed and put into practical use.
In such an air conditioner, since the internal combustion engine generates heat, it is preferable to recover and use this heat. Evaporation that heats and evaporates the working fluid by the waste heat of the internal combustion engine in the working fluid circulation path. An expander that expands the working fluid that passes through the evaporator to generate a rotational driving force, a driven transmission device that transmits the rotational driving force generated by the expander, and a working fluid that passes through the expander It is considered that a condenser to be condensed and a Rankine circuit in which a pump for sending a working fluid passing through the condenser to the evaporator is sequentially provided.

For example, an air conditioner configured to use waste heat of an internal combustion engine by using the compressor as a main compressor in a refrigeration circuit and interposing an auxiliary compressor as the driven transmission device of the Rankine circuit in series with the main compressor. An apparatus has been developed (Patent Document 1).
On the other hand, an air conditioner has been developed that covers the power required to drive the refrigeration circuit and the auxiliary components of the internal combustion engine by simultaneously operating the generator while driving the compressor in the internal combustion engine (gasoline engine, gas engine, etc.). (Patent Document 2).

JP 2004-12110 A JP 2007-252033 A

However, in the air conditioner described in Patent Document 1, since the auxiliary compressor is arranged in the refrigeration circuit in series with the main compressor, the same amount of refrigerant as the refrigerant flow rate of the main compressor does not flow through the auxiliary compressor. There is a problem that the auxiliary compressor is increased in size while being auxiliary.
Further, the air conditioner described in Patent Document 2 generates power by operating the generator while driving the compressor with the internal combustion engine, and therefore requires an internal combustion engine having a large output for the amount of power generation. There is a problem that the engine becomes larger. In this case, for example, the generator may be a driven transmission device of a Rankine circuit, but normally the power required by the auxiliary equipment is not so large, so the power generated by the generator is redundant and wasted. If the load on the generator becomes small, the expander becomes too high in rotation and may cause damage to the expander, which is not preferable.

  The present invention has been made in view of the above problems, and in an air conditioner that drives a compressor in an internal combustion engine, the waste heat of the internal combustion engine is Rankine-free without increasing the size of the components of the air conditioner including the internal combustion engine. An object of the present invention is to provide an air conditioner that can be recovered by a circuit to secure electric power necessary for the air conditioner and that can efficiently use all of the recovered waste heat without waste.

In order to achieve the above object, an air conditioner according to claim 1 is configured to drive a main compressor in an internal combustion engine to obtain a first refrigerant in a first refrigeration circuit, a first heat source side heat exchanger, and a utilization side heat. In an air conditioner that performs cooling or heating by circulating while changing phase through an exchanger, an evaporator that heats and evaporates the working fluid by waste heat of the internal combustion engine in a circulation path of the working fluid, and passes through the evaporator An expander that expands the working fluid transmitted to the generator, a condenser that condenses the working fluid that passes through the expander, and a pump that sends the working fluid via the condenser to the evaporator A Rankine circuit sequentially disposed, and an auxiliary compressor coupled to the expander together with the generator are driven by the rotational driving force of the expander to circulate the second refrigerant while changing the phase. A refrigeration circuit, Auxiliary heat exchanger which performs heat exchange with the second refrigerant in the first refrigerant and the second refrigeration circuit in the first refrigeration circuit between said the refrigeration circuit the second refrigeration circuit The first heat source side heat exchanger is arranged in series downstream of the first heat source side heat exchanger of the first refrigeration circuit as viewed in the flow direction of the first refrigerant. .

According to a second aspect of the present invention, the air conditioner includes a power generation control unit that controls power generation of the power generator according to the first aspect, and the power generation control unit is configured to supply the predetermined power necessary and sufficient for the air conditioner. The power generation is controlled.
According to a third aspect of the present invention, there is provided an air conditioner according to the second aspect, wherein the second refrigeration circuit includes auxiliary compressor load variable means for varying the load of the auxiliary compressor, and the auxiliary compressor load variable means includes: When the power generated by the generator is less than the predetermined power, the load on the auxiliary compressor is reduced.

According to a fourth aspect of the present invention, there is provided the air conditioner according to the third aspect, wherein the auxiliary compressor load varying means is configured such that when the generated power of the generator reaches the predetermined power, the auxiliary compressor load varying means causes the load of the auxiliary compressor to be changed. And the auxiliary compressor is driven by the rotational driving force of the expander.
In the air conditioner of claim 5, in any one of claims 1 to 4, the first heat source side heat exchanger of the first refrigeration circuit functions as a condenser during cooling, and functions as an evaporator during heating. In the first refrigeration circuit, the first refrigerant flows through the first heat source side heat exchanger of the first refrigeration circuit so that the first refrigerant flows in the same direction during both cooling and heating. refrigerant direction switching means for switching the flow of refrigerant, characterized in that is is al provided.

  In the air conditioner of claim 6, in any one of claims 1 to 5, the Rankine circuit and the first refrigeration circuit are partially shared, and the working fluid of the Rankine circuit and the first refrigeration circuit It is the same as the first refrigerant, and the condenser of the Rankine circuit is also used as the first heat source side heat exchanger of the first refrigeration circuit at the time of cooling, and the use side of the first refrigeration circuit at the time of heating. It is also used as a heat exchanger.

  In an air conditioner according to a seventh aspect, in any one of the first to sixth aspects, the internal combustion engine is a gas engine.

  According to the air conditioner of claim 1, the Rankine circuit uses the recovered waste heat of the internal combustion engine to rotationally drive the expander, and the rotational driving force drives the auxiliary compressor of the second refrigeration circuit together with the generator. In this case, power is generated by the generator and the waste heat of the internal combustion engine is used as electric power, and the second refrigerant is phase-changed in the second refrigeration circuit by the auxiliary compressor. By circulating, the heat released or absorbed by the first refrigerant in the first refrigeration circuit that performs cooling or heating is heated by the auxiliary heat exchanger between the first refrigerant and the second refrigerant in the second refrigeration circuit. Replaced and assisted. That is, during cooling, the first refrigerant is subcooled by the cooled second refrigerant in the second refrigeration circuit, and during heating, the first refrigerant is further radiated by the heat dissipation of the second refrigerant in the second refrigeration circuit. It absorbs heat.

As a result, the waste heat of the internal combustion engine can be recovered and used effectively as electric power, and all of the recovered waste heat can be efficiently used for cooling and heating without waste. A highly efficient air conditioner can be realized without increasing the size of the components.
In particular, since the auxiliary heat exchanger is arranged in series with the first heat source side heat exchanger on the downstream side of the first heat source side heat exchanger of the first refrigeration circuit, the first heat source recovers the first heat exchanger. It is possible to reliably assist the heat release and absorption of the first refrigerant in the refrigeration circuit. That is, during cooling, the first refrigerant after being condensed in the first heat source side heat exchanger can be supercooled to improve the cooling efficiency, and during heating, after the first refrigerant absorbs heat from the low temperature outside air In the second refrigeration circuit, the efficiency of heating can be improved by absorbing the heat of the second refrigerant that is higher than the outside air.

According to the air conditioner of claim 3, since the load on the auxiliary compressor is reduced when the power generated by the generator is less than the predetermined power, the operation of the generator is prioritized by reducing or eliminating the load on the auxiliary compressor. The predetermined power required for the air conditioner can be reliably generated by the generator and covered.
According to the air conditioner of the fourth aspect, since the load of the auxiliary compressor is increased when the generated power of the generator reaches a predetermined power, surplus power is generated wastefully while giving priority to the operation of the generator. In addition, the recovered waste heat can be used for cooling and heating extremely efficiently without causing the expander to rotate unnecessarily at high speed due to a decrease in the load on the generator.

According to the air conditioner of the fifth aspect, the first refrigerant flows through the first refrigeration circuit in the same direction in the first heat source side heat exchanger of the first refrigeration circuit both during cooling and during heating. A refrigerant direction switching means for switching the flow of the first refrigerant is provided, and the auxiliary heat exchanger is arranged in series with the first heat source side heat exchanger downstream of the first heat source side heat exchanger of the first refrigeration circuit. Therefore, by switching the refrigerant direction switching means, the cooling efficiency is improved by supercooling the first refrigerant after being condensed by the first heat source side heat exchanger in one auxiliary heat exchanger during cooling. The first refrigerant absorbs heat from the low-temperature outside air during heating, and then the second refrigeration circuit absorbs the heat of the second refrigerant that is higher than the outside air to improve the heating efficiency. Can be planned.

  According to the air conditioner of claim 6, the Rankine circuit and the first refrigeration circuit are partially shared, and the working fluid of the Rankine circuit and the first refrigerant of the first refrigeration circuit are the same, and the Rankine circuit The condenser is used also as the first heat source side heat exchanger and the use side heat exchanger of the first refrigeration circuit, so that the air conditioner can be made compact, and the recovered waste heat can be directly used especially during heating. Therefore, it can be used for heating more efficiently.

  According to the air conditioner of the seventh aspect, since the internal combustion engine is a gas engine with good fuel efficiency and easy maintenance, a highly efficient air conditioner using the gas engine can be realized.

It is a schematic diagram which shows the state at the time of air_conditioning | cooling of the air conditioner which concerns on this invention. It is a schematic diagram which shows the state at the time of the heating of the air conditioner which concerns on this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 and 2, the air conditioner according to the present invention includes a main compressor 12, a first heat source side heat exchanger (outdoor unit) 14, an expansion valve 15 and a use side heat exchanger (indoors). A main refrigeration circuit (first refrigeration circuit) 10 that performs cooling and heating by circulating the refrigerant (first refrigerant) in the pipeline 11 while changing the phase of the refrigerant (first refrigerant), and a compressor of the main refrigeration circuit 10 The heat (waste heat) of the cooling water flowing through the engine (internal combustion engine) 1 driving the engine 12 and the cooling water passage 2 of the engine 1 is recovered into the refrigerant (working fluid) flowing through the pipe line 21 via the evaporator 22. A Rankine circuit 20 that rotates the expander 24 to transmit the rotational driving force to the generator 26, an auxiliary compressor 32 that is connected to the expander 24 together with the generator 26, and a second heat source side heat exchanger (outdoor unit). 34, an expansion valve 35 and an auxiliary heat exchanger 36, a refrigerant (second refrigerant) And an auxiliary refrigeration circuit (the second refrigeration circuit) 30 for circulating in the pipe 31 while the phase change.

As the engine 1, a gas engine having good fuel consumption and easy maintenance is adopted here.
Specifically, the main refrigeration circuit 10 is located downstream of the main compressor 12 as viewed in the refrigerant flow direction, and the refrigerant flow direction is changed from the main compressor 12 to the first heat source side heat exchanger 14 or use side heat. A four-way valve 17 that switches to either one of the exchangers 16 is provided. That is, the four-way valve 17 switches the air conditioner between a cooling state and a heating state, and the air-conditioning is performed by switching the four-way valve 17 so that the refrigerant flow direction changes from the main compressor 12 to the first heat source side heat exchanger 14. The apparatus is in a cooling state (the state shown in FIG. 1), and the air conditioner is brought into a heating state by switching the four-way valve 17 so that the flow direction of the refrigerant is changed from the main compressor 12 to the use side heat exchanger 16 (see FIG. 1). 2 state). Thus, when the air conditioner is in the cooling state, the first heat source side heat exchanger 14 functions as a condenser and the use side heat exchanger 16 functions as an evaporator, while when the air conditioner is in the heating state, In addition, the use side heat exchanger 16 functions as a condenser, and the first heat source side heat exchanger 14 functions as an evaporator.

  As shown in FIGS. 1 and 2, the main refrigeration circuit 10 and the Rankine circuit 20 share a part of the pipe line 11 and a part of the pipe line 21. And the refrigerant (working fluid) of the Rankine circuit 20 are the same. Specifically, between the downstream side of the main compressor 12 including the four-way valve 17 and the first heat source side heat exchanger 14 and between the downstream side of the main compressor 12 and the utilization side heat exchanger 16, The pipe 21 is shared.

That is, the first heat source side heat exchanger 14 and the use side heat exchanger 16 of the main refrigeration circuit 10 are also the first heat source side heat exchanger 14 and the use side heat exchanger 16 as condensers of the Rankine circuit 20 at the same time. Yes, at the time of cooling, the on-off valve 28 is opened and the on-off valve 29 is closed so that the first heat source side heat exchanger 14 also functions as a condenser in the Rankine circuit 20. The use side heat exchanger 16 also functions as a condenser in the Rankine circuit 20 by opening the valve and closing the on-off valve 28.
In the Rankine circuit 20, in addition to the above, a pump 27 is interposed on the upstream side of the evaporator 22 as viewed in the refrigerant flow direction, and the refrigerant circulates in the pipe line 21 by the pump 27. .

  The auxiliary refrigeration circuit 30 is located downstream of the auxiliary compressor 32 as viewed in the refrigerant flow direction, and the refrigerant flow direction is changed from the auxiliary compressor 32 to the second heat source side heat exchanger 34 or the auxiliary heat exchanger 36. A four-way valve 37 for switching to either one is provided. The four-way valve 37 has a function similar to that of the four-way valve 17. When the air conditioner is in the cooling state, the four-way valve 37 so that the flow direction of the refrigerant changes from the auxiliary compressor 32 to the second heat source side heat exchanger 34. It is possible to cause the auxiliary heat exchanger 36 to function as an evaporator (the state shown in FIG. 1), and when the air conditioner is in the heating state, the refrigerant flow direction changes from the auxiliary compressor 32 to the auxiliary heat exchanger. The auxiliary heat exchanger 36 can function as a condenser by switching the four-way valve 37 so as to be 36 (state of FIG. 2).

  As shown in FIGS. 1 and 2, the auxiliary heat exchanger 36 of the auxiliary refrigeration circuit 30 is provided across the pipe line 31 of the auxiliary refrigeration circuit 30 and the pipe line 11 of the main refrigeration circuit 10. Heat is exchanged between the refrigerant of the circuit 10 (first refrigerant) and the refrigerant of the auxiliary refrigeration circuit 30 (second refrigerant). Specifically, a bridge circuit unit 19 is provided in the pipe line 11 of the main refrigeration circuit 10 so that the direction of the refrigerant flowing through the first heat source side heat exchanger 14 is always one direction during cooling and heating. The auxiliary heat exchanger 36 is always provided at a position downstream of the first heat source side heat exchanger 14 as viewed in the refrigerant flow direction in the main refrigeration circuit 10. Here, the four-way valve 17 and the bridge circuit portion 19 constitute a refrigerant direction switching means.

The auxiliary compressor 32 of the auxiliary refrigeration circuit 30 is a variable capacity compressor whose capacity can be changed by changing the angle of the swash plate, for example (auxiliary compressor load varying means).
Further, the generator 26 includes various accessories of the air conditioner when the generator 26 is not sufficiently driven to generate power, such as the first heat source side heat exchanger 14, the use side heat exchanger 16, and the second heat source side. A battery (secondary battery) 25 that supplies power to each fan motor, pump 27, and the like of the heat exchanger 34 is connected, and the battery 25 can be charged with the power generated by the generator 26.

The electronic control unit (ECU) 40 is a control device that performs various controls of the air conditioner according to the present invention. Switching between cooling and heating, that is, switching of the four-way valve 17 and the four-way valve 37, output control of the engine 1, power generation In addition to power generation control of the machine 26 and opening / closing of the on-off valve 28 and on-off valve 29, it is possible to control the angle of the swash plate of the auxiliary compressor 32 (power generation control means, auxiliary compressor load variable means).
Hereinafter, an operation of the air conditioner according to the present invention configured as described above will be described.

"When cooling"
When the engine 1 is operated by the ECU 40 and the four-way valve 17 and the four-way valve 37 are switched as shown in FIG. 1 and the air conditioner is switched to the cooling state, the refrigerant passes through the pipe line 11 of the main refrigeration circuit 10 in the direction of the arrow. As described above, the first heat source side heat exchanger 14 functions as a condenser and the use side heat exchanger 16 functions as an evaporator for cooling.

At this time, in the Rankine circuit 20, the refrigerant flows in the direction of the arrow 21 by the operation of the pump 27, and when the engine 1 is warmed up and the temperature of the cooling water flowing through the cooling water passage 2 rises, Heat) is recovered by the refrigerant in the pipe line 21 through the evaporator 22, and the refrigerant is heated and evaporated.
Thus, when the refrigerant in the pipe line 21 rises in temperature and evaporates, the refrigerant becomes a high-pressure gas. The high-pressure refrigerant performs expansion work in the expander 24, the expander 24 is driven to rotate, and the generator 26 is driven to generate power. It is done.

  The power generation by the generator 26 is controlled by the ECU 40, and is required by the generator 26 for each fan motor, pump 27, etc. of the first heat source side heat exchanger 14, the use side heat exchanger 16, and the second heat source side heat exchanger 34. Sufficient power is generated. In addition, when the charge electric energy of the battery 25 is lower than a specified value (for example, a full charge value), power generation necessary for charging the battery 25 is also performed. In any case, the generator 26 generates power so as to cover the predetermined power necessary and sufficient for the air conditioner.

  The rotational driving force of the expander 24 is also transmitted to the auxiliary compressor 32, and the auxiliary compressor 32 of the auxiliary refrigeration circuit 30 is also driven by the expander 24. When the auxiliary compressor 32 is driven, the refrigerant circulates in the pipe line 31 of the auxiliary refrigeration circuit 30 in the direction of the arrow, and during cooling, the refrigerant flow direction changes from the auxiliary compressor 32 to the second heat source side heat exchanger 34. Since the four-way valve 37 is switched, the auxiliary heat exchanger 36 functions as an evaporator.

  When the auxiliary heat exchanger 36 functions as an evaporator, the refrigerant after passing through the first heat source side heat exchanger 14 as the condenser of the main refrigeration circuit 10 is supercooled by the refrigerant in the pipe line 31 of the auxiliary refrigeration circuit 30 ( Sub-cool). That is, during cooling, the refrigerant condensed in the main refrigeration circuit 10 is further cooled by the refrigerant evaporated in the auxiliary refrigeration circuit 30. That is, the cooling of the refrigerant in the main refrigeration circuit 10 is assisted by heat exchange with the refrigerant in the auxiliary refrigeration circuit 30.

As described above, in the air conditioner according to the present invention, the waste heat of the engine 1 is recovered through the Rankine circuit 20, and the generator 26 generates power with a predetermined and sufficient power necessary for the air conditioner. The remaining waste heat that is recovered and not used for power generation is also efficiently used for cooling via the auxiliary refrigeration circuit 30, and the cooling efficiency of the air conditioner is improved.
By the way, when the engine 1 is not yet warmed up and the waste heat of the engine 1 is not sufficient and the power generation capacity of the generator 26 is low, or the predetermined power necessary and sufficient for the air conditioner is too large, When the generated power of the generator 26 is less than the predetermined power as in the case where the capacity cannot catch up, the ECU 40 preferentially implements the power generation drive of the generator 26 preferentially and also considers charging / discharging of the battery 25. Thus, necessary and sufficient predetermined power is secured for the air conditioner.

  Thus, when the power generation drive of the generator 26 is preferentially performed, when the auxiliary compressor 32 is driven, it becomes a load and prevents power generation by the generator 26. Therefore, here, when the power generation drive of the generator 26 is preferentially performed, the angle of the swash plate of the auxiliary compressor 32 is controlled to be small. Thereby, the load of the auxiliary compressor 32 is reduced, power generation by the generator 26 is promoted, and necessary and sufficient predetermined power is secured for the air conditioner.

"When heating"
When the engine 1 is operated by the ECU 40 and the four-way valve 17 and the four-way valve 37 are switched as shown in FIG. 2 and the air conditioner is switched to the heating state, the refrigerant passes through the pipe line 11 of the main refrigeration circuit 10 in the direction of the arrow. As described above, the use side heat exchanger 16 functions as a condenser and the first heat source side heat exchanger 14 functions as an evaporator to perform heating.

  At this time, in the Rankine circuit 20, the refrigerant flows in the direction of the arrow 21 by the operation of the pump 27, and when the engine 1 is warmed up and the temperature of the cooling water flowing through the cooling water passage 2 rises, Heat) is recovered by the refrigerant in the pipe line 21 through the evaporator 22, and the refrigerant is heated and evaporated. As a result, similarly to the above, the expander 24 is driven to rotate, the generator 26 is driven to generate power, and the auxiliary compressor 32 is driven. The operation of the generator 26 is the same as that at the time of cooling, and a description thereof is omitted.

When the auxiliary compressor 32 is driven by the expander 24, the refrigerant circulates in the pipe line 31 of the auxiliary refrigeration circuit 30 in the direction of the arrow, and the flow direction of the refrigerant is changed from the auxiliary compressor 32 to the auxiliary heat exchanger 36 during heating. Since the four-way valve 37 is switched so as to become, the auxiliary heat exchanger 36 functions as a condenser (heat radiator).
When the auxiliary heat exchanger 36 functions as a condenser, the refrigerant absorbed from the outside air by the first heat source side heat exchanger 14 as the evaporator of the main refrigeration circuit 10 is further increased by the refrigerant in the pipe 31 of the auxiliary refrigeration circuit 30. The heat is absorbed. That is, during heating, the refrigerant absorbed in the main refrigeration circuit 10 is further absorbed by the refrigerant condensed in the auxiliary refrigeration circuit 30. That is, the heat absorption of the refrigerant in the main refrigeration circuit 10 is assisted by heat exchange with the refrigerant in the auxiliary refrigeration circuit 30.

As described above, the waste heat of the engine 1 is recovered through the Rankine circuit 20 and the generator 26 generates a predetermined amount of power necessary and sufficient for the air conditioner, but is recovered during heating. The remaining waste heat that has not been used for power generation is also efficiently used for heating via the auxiliary refrigeration circuit 30, and the heating efficiency of the air conditioner is improved.
As in the case of cooling, when the power generated by the generator 26 is less than the predetermined power and the generator 26 is driven preferentially, the angle of the swash plate of the auxiliary compressor 32 is controlled to be small. In this way, necessary and sufficient predetermined power is secured for the air conditioner.

  As described above, according to the air conditioner according to the present invention, the engine 1 drives the main compressor 12 of the main refrigeration circuit 10 to perform cooling or heating, and the Rankine circuit 20 is used to waste heat of the engine 1. And the expander 24 is rotationally driven to drive the generator 26 to generate power, ensuring a necessary and sufficient predetermined power for the air conditioner, and the auxiliary compressor of the auxiliary refrigeration circuit 30 by the rotational driving force of the expander 24 32 is also driven to assist in releasing and absorbing heat of the refrigerant in the main refrigeration circuit 10.

  As a result, the waste heat of the engine 1 can be recovered by the Rankine circuit 20 and used effectively as electric power, and the expander 24 can be reduced by reducing the load on the generator 26 without causing surplus electric power to be generated by the generator 26. The remaining waste heat that is recovered and not used for power generation can be efficiently and efficiently used for cooling and heating via the auxiliary refrigeration circuit 30 without causing unnecessary high rotation and damage.

If the waste heat of the engine 1 can be efficiently used for cooling and heating in this way, it is not necessary to request a high capacity for the components of the air conditioner such as the engine 1 and the main compressor 12. A highly efficient air conditioner can be realized without increasing the size of the components of the air conditioner including the engine 1.
Further, when the power generated by the generator 26 is less than the predetermined power, the power generation drive of the generator 26 is preferentially performed, and at this time, the angle of the swash plate of the auxiliary compressor 32 is controlled to be small. It is possible to reduce the load on the machine 32 and promote the power generation by the generator 26, and to ensure the necessary and sufficient predetermined power for the air conditioner. In this case, when the generated power of the generator 26 reaches a predetermined power, the angle of the swash plate of the auxiliary compressor 32 is largely controlled to increase the load of the auxiliary compressor 32. While implementing with priority, all of the recovered waste heat can be used for cooling and heating extremely efficiently.

  Further, the pipe line 11 of the main refrigeration circuit 10 and the pipe line 21 of the Rankine circuit 20 are partially shared, and the first heat source side heat exchanger 14 and the use side heat exchanger 16 of the main refrigeration circuit 10 are simultaneously provided with the Rankine circuit. Since it is shared with 20 condensers, the air conditioner can be made compact. And by sharing in this way, especially during heating, the refrigerant from which the waste heat has been recovered will flow directly into the use side heat exchanger 16 as a condenser, and the recovered waste heat will be made direct. It can be used for heating even more efficiently.

  In addition, here, the bridge circuit unit 19 is provided in the pipe line 11 of the main refrigeration circuit 10, and the first heat source side heat exchanger (outdoor unit) is always viewed in the main refrigeration circuit 10 when the auxiliary heat exchanger 36 is viewed in the refrigerant flow direction. 14), the auxiliary heat exchanger 36 can be positioned immediately upstream of the use side heat exchanger (indoor unit) 16 during both cooling and heating, and the Rankine circuit 20 It is possible to reliably assist the heat release and absorption of the refrigerant in the main refrigeration circuit 10 by the waste heat recovered in step (b).

This is the end of the description of the embodiment of the present invention, but the present invention is not limited to the above embodiment.
For example, in the above embodiment, the auxiliary compressor load variable means is configured by changing the angle of the swash plate of the auxiliary compressor 32. However, the auxiliary compressor 32 is, for example, a multi-cylinder type and the number of cylinders is changed. Thus, the auxiliary compressor load variable means can be configured, and even in this way, the same effect as described above can be obtained.

Moreover, in the said embodiment, although the gas engine was employ | adopted as the engine 1, if the waste heat can be utilized, the engine 1 may be a gasoline engine, a diesel engine, etc.
Moreover, in the said embodiment, although waste heat is collect | recovered from the cooling water path 2 of the engine 1, you may comprise so that waste heat may be collect | recovered from the exhaust path of the engine 1 separately or with this. .

  Moreover, in the said embodiment, although the pipe line 11 of the main refrigeration circuit 10 and the pipe line 21 of the Rankine circuit 20 are partially shared, it does not necessarily need to be shared.

1 Engine 2 Cooling water passage 10 Main refrigeration circuit (first refrigeration circuit)
14 first heat source side heat exchanger 16 use side heat exchanger 20 Rankine circuit 22 evaporator 24 expander 26 generator 30 auxiliary refrigeration circuit (second refrigeration circuit)
32 Auxiliary compressor 34 Second heat source side heat exchanger 36 Auxiliary heat exchanger 40 Electronic control unit (ECU) (power generation control means, auxiliary compressor load variable means)

Claims (7)

By driving the main compressor in the internal combustion engine, the first refrigerant is circulated while changing the phase in the first refrigeration circuit via the first heat source side heat exchanger and the use side heat exchanger, thereby performing cooling or heating. In the air conditioner,
An evaporator that heats and evaporates the working fluid by waste heat of the internal combustion engine in the working fluid circulation path; an expander that expands the working fluid that passes through the evaporator and transmits a rotational driving force to the generator; A Rankine circuit in which a condenser that condenses the working fluid that has passed through the expander, and a pump that sequentially sends the working fluid that has passed through the condenser to the evaporator;
A second refrigeration circuit that circulates while changing the phase of the second refrigerant by driving an auxiliary compressor connected to the expander together with the generator by the rotational driving force of the expander;
Wherein between the first refrigeration circuit and the second refrigeration circuit, performs heat exchange with the second refrigerant of the first of the first within the second refrigeration circuit the refrigerant in the refrigerant circuit An auxiliary heat exchanger is arranged in series with the first heat source side heat exchanger on the downstream side of the first heat source side heat exchanger of the first refrigeration circuit as viewed in the flow direction of the first refrigerant. An air conditioner characterized by that. Power generation control means for controlling the power generation of the generator,
2. The air conditioner according to claim 1, wherein the power generation control means controls the power generation of the generator so as to cover the predetermined power necessary and sufficient for the air conditioner. The second refrigeration circuit has auxiliary compressor load varying means for varying the load of the auxiliary compressor,
The air conditioner according to claim 2, wherein the auxiliary compressor load variable means reduces the load of the auxiliary compressor when the power generated by the generator is less than the predetermined power.   The auxiliary compressor load variable means increases the load of the auxiliary compressor by the auxiliary compressor load variable means when the generated power of the generator reaches the predetermined power, and uses the rotational driving force of the expander to increase the load of the auxiliary compressor. The air conditioner according to claim 3, wherein the auxiliary compressor is driven. The first heat source side heat exchanger of the first refrigeration circuit functions as a condenser during cooling, and functions as an evaporator during heating,
The first refrigerant flows in the first refrigeration circuit so that the first refrigerant flows in the same direction in the first heat source side heat exchanger of the first refrigeration circuit during both cooling and heating. wherein the refrigerant direction switching means comprises been found provided to switch, the air conditioner according to any one of claims 1 to 4. The Rankine circuit and the first refrigeration circuit are partially shared, and the working fluid of the Rankine circuit and the first refrigerant of the first refrigeration circuit are the same,
The condenser of the Rankine circuit is used also as a first heat source side heat exchanger of the first refrigeration circuit during cooling, and also used as a use side heat exchanger of the first refrigeration circuit during heating. The air conditioner according to any one of claims 1 to 5, wherein the air conditioner is characterized.   The air conditioner according to any one of claims 1 to 6, wherein the internal combustion engine is a gas engine.

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