JPH10306954A - Engine driven refrigerant compression circulation type heat transfer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply a sufficient heat quantity to a heat utilization device by effectively making use of waste heat from a refrigerant in addition to waste heat from an engine while meeting functions necessary for air conditioners or the like. SOLUTION: This device comprises a refrigerant circuit 10 which circulates a refrigerant by returning a refrigerant discharged from a compressor 5 to a condenser (an outdoor heat exchanger 35 at the time of cooling) to the compressor 5 by way of an expansion valve, an evaporator (an indoor heat exchanger at the time of cooling). The compressor 5 is driven by an engine 2. To a cooling water circuit 50 of the engine, heat exchangers 52, 53 for recovering waste heat, a radiation heat exchanger 57, and a refrigerant heat absorption heat exchanger 36 are provided. This refrigerant heat absorption heat exchanger 36 absorbs heat of a high pressure refrigerant flowing through a bypass passage 13c which bypasses the outdoor heat exchanger 35 used as a condenser at the time of cooling. A linear three way valve 37 is mounted on the bypass passage 13c for adjusting the flow rate of the refrigerant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine-driven refrigerant compression-circulation heat transfer device including a refrigerant circuit in which refrigerant is circulated by a compressor and an engine for driving the compressor.

[0002]

2. Description of the Related Art A refrigerant circuit for circulating a refrigerant is provided with a compressor, a condenser, an expansion valve and an evaporator. The refrigerant compressed by the compressor is condensed and liquefied while radiating heat in the condenser, and then expanded by the expansion valve. A refrigerant compression circulation type heat transfer device which is made to return to the compressor after being evaporated while absorbing heat in an evaporator is generally known as a heat pump device such as a refrigerating device or an air conditioner.

Further, a compressor in such a refrigerant compression-circulation type heat transfer device is driven by an engine, and a cooling water circuit for circulating cooling water to the engine is provided to cool the engine and to cool the engine. There has also been considered one that extracts waste heat of an engine using cooling water flowing through a circuit and supplies the waste heat to a heat utilization means such as a water heater.

For example, Japanese Patent Application Laid-Open No. 7-280385 discloses a cooling water circuit in which a radiator, an accumulator heat exchanger for exchanging heat between a refrigerant in an accumulator in a refrigerant circuit and engine cooling water, and a hot water tank are provided. A hot water tank heat exchanger for exchanging heat between the internal water and the engine cooling water is provided. And as a specific circuit configuration,
For example, an accumulator heat exchanger is connected to the engine in parallel, a hot water tank heat exchanger and a radiator are arranged in series, and a passage for introducing cooling water to the accumulator heat exchanger and a water tank heat exchanger and a radiator are provided. A structure in which a linear three-way valve for adjusting flow distribution is provided at a branch or a junction with a passage for guiding cooling water is shown.

[0005]

However, in the prior art, when the use of hot water is high when the required capacity is small during heating of the air conditioner, or when cooling of the air conditioner or freezing of the refrigerating device is required. When the demand for using hot water is high in a state where the capacity is small, the demand may not be sufficiently satisfied. That is, when the required capacity is small at the time of heating, cooling, or freezing, the engine output is correspondingly reduced, and the engine waste heat is also reduced.

[0006] In addition, during cooling of an air conditioner or freezing of a refrigerating device, even if the demand for using hot water is high, the heat of condensation generated in the condenser of the refrigerant circuit is only discharged to the atmosphere and is not effectively used. There is.

SUMMARY OF THE INVENTION In view of such circumstances, an object of the present invention is to provide an engine-driven refrigerant compression / circulation type heat transfer device which can effectively utilize the waste heat of the refrigerant in addition to the waste heat of the engine.

[0008]

The invention according to claim 1 is
An engine-driven refrigerant compression-circulation system comprising a refrigerant circuit for circulating the refrigerant discharged from the compressor through a condenser, an expansion valve, and an evaporator so as to return to the compressor, wherein the compressor is driven by an engine. In the heat transfer device, a waste heat recovery heat exchanger that absorbs waste heat of the engine into the heat exchange liquid, a heat radiating unit that extracts heat from the heat exchange liquid and supplies the heat to a heat utilization device, A liquid passage for allowing the exchange liquid to flow across the waste heat recovery heat exchanger and the heat radiating portion, and a heat absorber for absorbing the heat of the high-pressure refrigerant in the bypass passage that is arranged in the middle of the liquid passage and bypasses the condenser and reaches the expansion valve. A heat exchanger for absorbing refrigerant heat, and valve means for adjusting a ratio of a refrigerant flow amount of the bypass passage to a refrigerant flow amount of the main high-pressure refrigerant passage for flowing refrigerant from the compressor to the expansion valve through the condenser are provided. In things That.

According to this structure, the function of the refrigeration system or the air conditioner is satisfied by adjusting the ratio of the flow rate of the refrigerant in the bypass passage by the valve means in accordance with the operating state and the like, while reducing the engine waste heat. In addition, refrigerant waste heat generated in the heat exchanger for absorbing refrigerant heat in the bypass passage is also absorbed by the liquid for heat exchange in the liquid circuit, and is effectively used by being supplied from the radiator to the heat utilization device.

According to a second aspect of the present invention, in the device according to the first aspect, the refrigerant circuit includes an outdoor heat exchanger and an indoor heat exchanger, and during cooling, the outdoor heat exchanger is a condenser and the indoor heat exchanger is an evaporator. A four-way valve that switches the refrigerant circulation path so that the indoor heat exchanger becomes a condenser and the outdoor heat exchanger becomes an evaporator during heating, so as to constitute an air conditioner capable of cooling and heating, A refrigerant heat absorbing heat exchanger is provided in a bypass passage bypassing the outdoor heat exchanger, and the bypass passage is opened by a valve means at least during cooling.

According to this configuration, during cooling, the heat exchanger for absorbing refrigerant heat functions as a condenser instead of the outdoor heat exchanger, and the heat of condensation is supplied to the heat utilization device via the liquid for heat exchange. As a result, the heat of condensation that has conventionally been released from the outdoor heat exchanger to the atmosphere is effectively used.

According to a third aspect of the present invention, in the apparatus according to the first aspect, the refrigerant circuit includes an outdoor heat exchanger and an indoor heat exchanger, and the outdoor heat exchanger is a condenser and an indoor heat exchanger during cooling. Is an evaporator, and a four-way valve for switching the refrigerant flow path is provided so that the indoor heat exchanger becomes a condenser and the outdoor heat exchanger becomes an evaporator during heating, thereby forming an air conditioner capable of cooling and heating. An outdoor heat exchanger that branches off from the high-pressure refrigerant passage between the compressor and the four-way valve,
A bypass passage is formed to bypass the expansion valve and the indoor heat exchanger to the low-pressure refrigerant passage, and a heat exchanger for absorbing refrigerant heat and a bypass-side expansion valve are provided in the bypass passage, and during a cooling operation or a heating operation. When the required capacity on the indoor heat exchanger side is small, at least a part of the circulating refrigerant is guided to the bypass passage by a valve means.

According to this configuration, during cooling or heating, even when the required capacity is small, the engine load is maintained at a relatively high level, and part or all of the engine output is converted into heat in the liquid passage by the heat exchanger. And the amount of heat to be supplied to the heat utilization equipment is sufficiently ensured by this and the waste heat of the engine.

[0014]

Embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an air conditioner as an example of an engine driven refrigerant compression circulation type heat transfer device according to the present invention. This air conditioner is an outdoor unit 1 shown in FIG.
A and a plurality of indoor units 1B arranged for each room R shown in FIG. The air conditioner includes a water-cooled gas engine 2 (hereinafter abbreviated as engine 2), a compressor 5 connected to an output shaft 3 of the engine 2 and driven by the engine 2, and a refrigerant circuit for circulating a refrigerant. 1
0, a cooling water circuit 50 for cooling the engine 2
Are provided.

The refrigerant circuit 10 passes the refrigerant discharged from the compressor 5 through a condenser, an expansion valve and an evaporator.
To form a closed circuit for circulating so as to return to. In the present embodiment, a four-way valve 11 for switching a refrigerant circulation path is provided to constitute an air conditioner that can be switched between cooling and heating and that can cool and heat each of the rooms R, and an indoor unit of each of the rooms R 1B is provided with a plurality of indoor heat exchangers 41, and is connected to the base circuit 12 that constitutes a circuit from the compressor 5 to the four-way valve 11, and to the base circuit 12 via the four-way valve 11. Outdoor circuit 13
And a plurality of indoor circuits 14 connected to the outdoor circuit 13 constitute the refrigerant circuit 10.

The base circuit 12 includes a discharge line 15 connecting the discharge port of the compressor 5 and the first port 11a of the four-way valve 11, a second port 11b of the four-way valve 31, and a suction port of the compressor 5. And a suction side line 16 for connecting
An oil separator 17 is provided on the discharge side line 15, and an accumulator 21 is provided on the suction side line 16.

The oil separator 17 separates oil mixed in the refrigerant passing through the discharge line 15.
The oil is supplied from the oil separator 17 to the strainer 18.
In addition, a line 20 provided with a capillary tube 19 returns the suction side line 16 to the downstream side near the compressor suction port.

A gas phase and a liquid phase refrigerant are contained in an accumulator 21 installed in the suction side line 16. A line 16a for leading the refrigerant from the four-way valve 11 to the accumulator 21 and a line 16b for leading the gas-phase refrigerant from the accumulator 21 are connected to an upper portion of the accumulator 21, and a line 16c bent downward to the line 16b.
The downstream line 16 d that follows is connected to the suction port of the compressor 3. The lower part of the accumulator 21 is connected to the lower end of the line 16c via an oil return line 22 having a strainer 23 and an on-off valve 24.

Lines 25 and 26 are connected to the intermediate portion of the accumulator 21 at upper and lower positions, and strainers 27 and 28 are connected to the lines 25 and 26, respectively.
And capillaries 29, 30 are interposed, and each line 2
The downstream ends of 5, 26 are connected to the line 16c. Temperature sensors 31, 32 for lines 25, 26
Are provided, and the temperature sensor 31 and the line 32
The liquid level in the accumulator 21 is detected by detecting the temperature of the refrigerant in the accumulators 5 and 26.

Further, in the accumulator 21, a heat exchanger 3 for heating the refrigerant in the accumulator 21 is provided.
3 are provided.

The line 13a of the outdoor circuit 13 is connected to the third port 11c of the four-way valve 11.
An outdoor heat exchanger 35 is installed in 3a. Further, a heat exchanger for absorbing refrigerant heat is provided for absorbing the heat of the high-pressure refrigerant in the bypass passage, which bypasses the condenser and reaches the expansion valve, to the engine cooling water. In the present embodiment, an outdoor heat exchanger serving as a condenser during cooling is provided. A heat exchanger 36 for absorbing refrigerant heat is provided in parallel with the outdoor heat exchanger 35 in order to absorb the heat of the high-pressure refrigerant in the passage 13 c bypassing the heat exchanger 35. The bypass passage 13
At the point where c is connected to the line 13a, a three-way valve 37 as valve means for adjusting the ratio of the amount of refrigerant flow in the bypass passage 13c to the amount of refrigerant flow in the main high-pressure refrigerant passage (the passage passing through the outdoor heat exchanger 35) is provided. Is provided. Line 13
A joint 38 is connected to the end of the “a”.

A line 13b of the outdoor circuit 13 is connected to the fourth port 11d of the four-way valve 11, and this line 13b
Is connected to a joint 39.

On the other hand, as shown in FIG.
An indoor heat exchanger 41 disposed in each room R and an electronic expansion valve 42 connected thereto are provided. The electronic expansion valve 42 is connected to the line 14 a connected to the joint 38 and connected to the joint 39. The indoor heat exchanger 41 is connected to the line 14b. A temperature sensor 43 for detecting a refrigerant temperature is provided between the electronic expansion valve 42 and the indoor heat exchanger 41.

The cooling water circuit 50 circulates cooling water for cooling the engine. In the present embodiment, the cooling water circuit 50 includes a waste heat recovery heat exchanger,
A heat radiating portion for extracting heat from the heat exchange liquid and supplying the heat to the heat utilization equipment is incorporated, and the cooling water circuit 50 removes engine cooling water as the heat exchange liquid from the waste heat recovery heat exchanger and the heat radiating portion. A liquid passage is formed to flow through the liquid passage. Further, the coolant heat absorbing heat exchanger 36 is incorporated in the cooling water circuit 50.

That is, as shown in FIG. 1, the cooling water passage 50 has a heat exchanger composed of a water jacket 52 of an engine as a waste heat recovery heat exchanger and an exhaust gas heat exchanger provided in a muffler of an exhaust passage. And a cooling water passage 51 derived from a discharge side of a cooling water circulation pump 54.
a is the exhaust gas heat exchanger 53 and the engine-side pump 5
5 and connected to the cooling water inlet of the water jacket 52, and a cooling water passage 51b is led out of the cooling water outlet of the water jacket 52 via a thermostat 56, and the passage 51b serves as the heat radiating portion. Are connected to the heat exchanger 57 for heat radiation. The heat-exchanging heat exchanger 57 is arranged in the hot-water storage tank 70 so that heat released from the engine cooling water can be supplied to the water stored in the hot-water storage tank 70.

Further, a cooling water passage 51c derived from the heat radiation heat exchanger 57 is connected to the refrigerant heat absorption heat exchanger 36 via a linear three-way valve 58, and is derived from the refrigerant heat absorption heat exchanger 36. The cooled water passage 51d reaches the water pump 54. A cooling water passage 51e branched via the linear three-way valve 58 joins the passage 51c after passing through the heat exchanger 33 provided in the accumulator 21.

A water inlet 60 is connected to the cooling water passage 51d. As shown in FIG.
A water supply cylinder 61 communicating with the cooling water passage 51d;
1 includes a cap 62 for opening and closing the upper end opening, and a pressure valve 63 disposed on the cap 62. The pressure valve 63 is configured to open and close a valve seat opening 61a formed in an intermediate portion of the water supply cylinder 61 with the valve body 63a, and the valve body 63a is urged in a closing direction by a spring 63b. When the pressure in the cooling water passage exceeds the valve opening pressure, the pressure valve 63 opens to release the pressure, thereby regulating the maximum pressure in the cooling water passage.

The hot water storage tank 70 has a city water introduction passage 71 provided with an on-off valve 72 and a check valve 73.
, A radiator circulation passage 74 in which a radiator 75 and a pump 76 are interposed, a passage 77 for supplying heat to various heat utilization devices, and the like. A pump 78 is provided in the passage 77.

As shown in FIG. 2, the passage 77 is provided over a range corresponding to the plurality of rooms R, and a branch portion is introduced into each room R, and the floor heater 8 as a heat utilization device is provided.
1. Connected to an instant water heater 82, a hot water tap 83, a heater 84, and the like.

According to the apparatus of the present embodiment as described above,
In the refrigerant circuit 10, the four-way valve 11 is switched according to the time of cooling and the time of heating, so that one of the outdoor heat exchanger 35 and the indoor heat exchanger 41 is a condenser and the other is an evaporator. Then, the refrigerant discharged from the compressor 5 is circulated so as to return to the compressor 5 via the condenser, the expansion valve, and the evaporator.

That is, during the cooling operation, the first port 11a and the third port 11c of the four-way valve 11 are connected, and the fourth port 11d and the second port 11b are connected. Thereby, as shown by solid arrows in FIGS. 1 and 2, the refrigerant discharged from the compressor 5 driven by the engine 2 to the discharge side line 15 passes through the four-way valve 11,
It is guided to a condenser constituted by an outdoor heat exchanger 35 and a heat exchanger 36 for absorbing refrigerant heat in parallel with the outdoor heat exchanger 35, where it is radiated and liquefied, and then passes through a joint 38 and a line 14a from a line 13a to each room. Sent to unit 1B,
An indoor heat exchanger 41 serving as an evaporator through an electronic expansion valve 42
, Where heat is absorbed and cooling is performed. Then, it flows through the line 14b, the joint 39, and the line 13b, passes through the four-way valve 11, flows into the suction side line 16, and is returned to the compressor 5.

During the heating operation, the first port 11a and the fourth port 11d of the four-way valve 11 are connected, and the third port 11c and the second port 11b are connected. As a result, the refrigerant discharged from the compressor 5 driven by the engine 2 to the discharge line 15 flows from the four-way valve 11 to the line 13 as indicated by a broken line arrow in FIGS.
b, the joint 39, and the line 14b are sent to each indoor unit 1B, guided to the indoor heat exchanger 41 serving as a condenser, where they are radiated and liquefied, and are heated by the condensed heat. Then, via the electronic expansion valve 42, the line 14a,
After passing through the joint 38 and the line 13a, it is guided to the outdoor heat exchanger 35 serving as an evaporator, where the heat is absorbed and vaporized, and then flows through the four-way valve 11 to the suction side line 16 and then to the compressor 5 through the accumulator 21 Will be returned.

Further, in the cooling water circuit 50, the cooling water is circulated as indicated by the arrow, thereby cooling the engine and, at the same time, discharging the waste heat of the engine in the exhaust gas heat exchanger 53 and the water jacket 52. It is absorbed by the cooling water and is taken out by the heat-radiating heat exchanger 57 to be supplied to the heat utilization equipment. Further, during the cooling operation, the refrigerant waste heat is also extracted from the refrigerant heat absorbing heat exchanger 36 via the cooling water.

That is, during the cooling operation, the refrigerant circuit 10
By controlling the linear three-way valve 37 so as to increase the flow rate of the refrigerant in the passage 13c bypassing the outdoor heat exchanger 35, the heat exchanger 36 for mainly absorbing the refrigerant heat is replaced with a condenser instead of the outdoor heat exchanger. Function. In this state, the cooling water circulating in the cooling water passage passes through the heat exchanger 36 for absorbing refrigerant heat, further passes through the pump 54, the exhaust gas heat exchanger 53, passes through the pump 55, the water jacket 52, and the thermostat 56 ( A portion flows directly from the exhaust gas heat exchanger 53) to the heat dissipation heat exchanger 57. Thereby, the condensing heat, which is the refrigerant heat, and the engine heat are absorbed by the cooling water, and the heat is supplied to the water stored in the hot water storage tank 70 in the heat exchanger 57 for heat radiation.

The heat supplied to the water in the hot water storage tank 70 is supplied to the floor heater 81 and the instantaneous water heater 8 as required.
2. It is supplied to a hot water tap 83, a heater 84 and the like.

Thus, during cooling operation, refrigerant waste heat is effectively used in addition to engine waste heat. Further, in the present embodiment, since the water in the cooling water circuit 50 and the water in the hot water storage tank 70 are separated by the heat exchanger for heat radiation 57, the heat exchanger for refrigerant heat absorption 36 is temporarily damaged and circulates. Even if the refrigerant is slightly mixed in the cooling water, the refrigerant does not mix with the warm water supplied from the hot water tap 83 or the like.

On the other hand, during the heating operation, the linear three-way valve 3
7, the bypass passage 13c is closed. However, during the heating operation, when the outside air temperature is lower than the temperature of the low-pressure refrigerant, the linear three-way valve 37 controls the bypass passage 13c.
Is opened, and a part of the engine waste heat is given to the refrigerant by using the heat exchanger 36 in the bypass passage 13c. In this way, although the temperature of the hot water in the hot water storage tank 70 slightly decreases, heating in the indoor unit becomes possible. At this time, while the bypass passage 13c is closed by the linear three-way valve 37, the warm water in the cooling water passage 50 is guided to the heat exchanger 33 of the accumulator 21 by the linear three-way valve 58, so that a part of the engine waste heat is cooled. In this case, too, the temperature of the hot water in the hot water storage tank 70 is slightly lowered, but the indoor unit can be heated.

Another embodiment of the apparatus of the present invention will be described with reference to FIG. The same parts as those of the embodiment shown in FIG.

In the embodiment shown in FIG.
Separately from 0, there is provided a liquid passage 90 for flowing water as a liquid for heat exchange over the heat exchanger for waste heat recovery and the radiator. A heat exchanger 91 is provided between the cooling water circuit 50 and the liquid passage 90, and the engine waste heat absorbed by the cooling water in the cooling water circuit 50 is transferred to the liquid in the liquid passage 90 by the heat exchanger 91. It is supposed to be. The cooling water circuit 50 is provided with a radiator 88 in parallel with the heat exchanger 91. A radiator 88 is provided at a branch point between the passage of the radiator 88 and the passage of the heat exchanger 91 in accordance with the cooling water temperature or the like.
There is provided a linear three-way valve 89 for adjusting the flow rate of the cooling water to the heat exchanger 8 and the heat exchanger 91.

The liquid passage 90 is provided with a pump 95 and a heat exchanger 96 for absorbing refrigerant heat. Further, a passage 93 branched from the liquid passage 90 via the linear three-way valve 92 is connected to the heat exchanger 33 in the accumulator 21 of the refrigerant circuit 10.

The liquid passage 90 is connected to a heat radiator. In the example shown in FIG. 4, the liquid passages 90 provided when a plurality of outdoor units 1A are provided are connected to a hot water storage tank 98 as a heat radiator. The joint 94 is connected to the circulation passage 99 connected to the hot water storage tank 98 so as to be possible.
The liquid passage 90 is connected via the.
The circulation passage 99 is provided with a pump 97.

In the refrigerant circuit 10, a linear three-way valve 1 is connected to a discharge line 15 between the compressor 5 and the four-way valve 11.
A bypass passage 102 is provided from the linear three-way valve 101 to the suction side line 16 bypassing the indoor heat exchanger 41, the expansion valve 42, the outdoor heat exchanger 35, and the four-way valve 11. . In the middle of this bypass passage 102, the heat exchanger 96 for absorbing refrigerant heat and the electronic expansion valve 1
03 is provided.

According to this embodiment, during the cooling operation or the heating operation, when the required capacity on the indoor unit side is small, such as when some of the plurality of indoor units shown in FIG. A part of the high-pressure refrigerant flows into the bypass passage 102 by the three-way valve 101. As a result, the heat exchanger 96 functions as a condenser, and the heat of condensation is transferred to the liquid passage 9.
Absorbed in water of zero. The refrigerant that has passed through the heat exchanger 96 is reduced in temperature and pressure by the electronic expansion valve 103, then guided to the suction side line 16 and sent to the accumulator 21, where it is discharged by the heat exchanger 33 by the heat exchanger 33. Some of the heat is absorbed.

In this way, part or all of the engine output is given to the water in the liquid passage 90 as heat in the heat exchanger, and the engine waste heat is also given to the water in the liquid passage 90 via the heat exchanger 91. . That is, even when the required capacity on the indoor unit side is small, it is possible to keep the engine load high, and to take out the heat obtained by the output and the engine waste heat through the liquid passage 90.

In each of the above embodiments, the device of the present invention is applied to an air conditioner, but can be applied to a refrigeration device and the like.

[0047]

As described above, the engine-driven refrigerant compression circulation heat transfer device of the present invention has a liquid passage for flowing a heat exchange liquid between a heat exchanger for recovering engine waste heat and a radiator. A heat exchanger for absorbing refrigerant heat, which is disposed in the middle of the liquid passage and absorbs the heat of the high-pressure refrigerant in the bypass passage that bypasses the condenser, and the amount of refrigerant flow in the bypass passage with respect to the amount of refrigerant flow in the main high-pressure refrigerant passage And a valve means for adjusting the ratio of the refrigerant, thereby satisfying the function as a refrigerating device or an air conditioner, etc., and effectively utilizing not only the engine waste heat but also the refrigerant waste heat generated in the refrigerant circuit, so that the heat utilization equipment can be used. Enough heat can be supplied.

[Brief description of the drawings]

FIG. 1 is an overall circuit diagram showing an outdoor unit side in an apparatus according to an embodiment of the present invention applied to an air conditioner.

FIG. 2 is a circuit diagram showing an indoor unit side and a liquid circulation circuit of the device.

FIG. 3 is a sectional view of a water inlet;

FIG. 4 is a circuit diagram showing another embodiment of a liquid passage and the like.

[Explanation of symbols]

 2 Engine 5 Compressor 10 Refrigerant circuit 11 Four-way valve 35 Outdoor heat exchanger 36 Heat exchanger for refrigerant heat absorption 37 Linear three-way valve 41 Indoor heat exchanger 42 Electronic expansion valve 50 Cooling water circuit 52 Water jacket 53 Exhaust gas heat exchanger 57 Heat exchanger for heat radiation 70 Hot water storage tank 81 to 84 Heat utilization equipment 90 Liquid passage 91 Heat exchanger 96 Heat exchanger for refrigerant heat absorption 101 Linear three-way valve 102 Bypass passage

Claims (3)

[Claims] An engine having a refrigerant circuit for circulating refrigerant discharged from a compressor through a condenser, an expansion valve, and an evaporator so as to return to the compressor, wherein the compressor is driven by the engine. In a drive refrigerant compression circulation heat transfer device, a waste heat recovery heat exchanger that absorbs engine waste heat into a heat exchange liquid, and heat radiation for extracting heat from the heat exchange liquid and supplying it to a heat utilization device Part, a liquid passage through which the heat exchange liquid flows over the waste heat recovery heat exchanger and the heat radiating part, and a high-pressure refrigerant in a bypass passage that is arranged in the middle of the liquid passage and bypasses the condenser to reach the expansion valve. And a valve for adjusting the ratio of the amount of refrigerant flow in the bypass passage to the amount of refrigerant flow in the main high-pressure refrigerant passage through which refrigerant flows from the compressor to the expansion valve via the condenser. Means An engine-driven refrigerant compression-circulation heat transfer device, wherein: 2. A refrigerant circuit comprising an outdoor heat exchanger and an indoor heat exchanger, wherein the outdoor heat exchanger serves as a condenser and the indoor heat exchanger serves as an evaporator during cooling, and the indoor heat exchanger serves as a condenser during heating. An engine-driven refrigerant compression-circulation type heat transfer device provided with a four-way valve for switching a refrigerant flow path so that the outdoor heat exchanger becomes an evaporator, to constitute an air conditioner capable of cooling and heating, wherein the outdoor heat exchanger 2. A heat transfer device for compressing and circulating an engine-driven refrigerant according to claim 1, wherein a heat exchanger for absorbing refrigerant heat is provided in a bypass passage for bypassing the heat exchanger, and the bypass passage is opened by a valve means at least during cooling. . 3. A refrigerant circuit comprising an outdoor heat exchanger and an indoor heat exchanger, wherein the outdoor heat exchanger serves as a condenser and the indoor heat exchanger serves as an evaporator during cooling, and the indoor heat exchanger serves as a condenser during heating. An engine-driven refrigerant compression-circulation heat transfer device provided with a four-way valve for switching a refrigerant flow path so that the outdoor heat exchanger becomes an evaporator to constitute an air conditioner capable of cooling and heating, wherein the compressor and the four-way A bypass passage branching from the high-pressure refrigerant passage between the valve and the outdoor heat exchanger, bypassing the expansion valve and the indoor heat exchanger and leading to the low-pressure refrigerant passage, and a refrigerant heat absorption heat exchanger in the bypass passage; A bypass-side expansion valve is provided, and at least part of the circulating refrigerant is guided to the bypass passage by the valve means when the required capacity on the indoor heat exchanger side is small during the cooling operation or the heating operation. The engine-driven refrigerant compression circulation heat transfer device according to claim 1, wherein: