JPH10311620A - Heat-pump type air conditioner driven by engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an effective use of the refrigerant heat in addition to the waste heat from an engine by arranging a first heat exchanger to absorb the waste heat from the engine from a cooling water circuit and a second heat exchanger to absorb the refrigerant heat on the high pressure side of a refrigerant circuit on a hot water circulation circuit. SOLUTION: A first heat exchanger 101 and a second heat exchanger 102 are arranged in series in an indoor unit side passage 100a of a hot water circulation circuit 100. The waste heat from an engine is absorbed from the cooling water flowing in a passage 84 of a cooling water circuit 80 is absorbed by the first heat exchanger 101, and the heat from the high pressure side refrigerant flowing in bypass passages 69a, 69b of a refrigerant circuit 30 is absorbed by the second heat exchanger 102. In addition, a pump 103, a water inlet 104, and a recovery tank 105 are connected to the outdoor unit side passage 100a to form a hot water feed unit 100x of the hot water circulation circuit 100 which is arranged in an outdoor unit 1A or outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine driven heat pump type air conditioner provided with a refrigerant circuit having an engine driven compressor, a four-way valve, an outdoor heat exchanger, an expansion valve and an indoor heat exchanger. It is.

[0002]

2. Description of the Related Art In a refrigerant circuit for circulating a refrigerant, a compressor driven by an engine, a four-way valve for switching a refrigerant flow path, an outdoor heat exchanger functioning as a condenser or an evaporator, an expansion valve, and an evaporator. An indoor heat exchanger that functions as a heat exchanger or a condenser is arranged. By switching the four-way valve, a compressor, a four-way valve, an outdoor heat exchanger, an expansion valve, an indoor heat exchanger, a four-way valve, and a compressor are used during cooling. An engine-driven heat pump air conditioner that circulates refrigerant in the order of, and circulates refrigerant in the order of compressor, four-way valve, indoor heat exchanger, expansion valve, outdoor heat exchanger, four-way valve, and compressor during heating Is generally known.

In such an engine-driven heat pump air conditioner, a cooling water circuit for circulating cooling water to the engine is provided to cool the engine and to utilize the cooling water flowing through the cooling water circuit. There has also been considered an apparatus that extracts waste heat from an engine and supplies the waste heat to heat utilization equipment 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 required capacity is small during heating or cooling, the engine output is reduced accordingly, and the engine waste heat is also reduced. May not be able to respond sufficiently. In addition, during cooling, there is a problem that the heat of condensation generated in the condenser of the refrigerant circuit is only released to the atmosphere and is not effectively used.

In view of such circumstances, the present invention provides an engine driven heat pump air conditioner that can supply sufficient heat to heat utilization equipment by effectively utilizing the heat of a refrigerant in addition to the waste heat of an engine. The purpose is to provide.

[0007]

According to the present invention, there is provided a refrigerant circuit having a compressor driven by an engine, a four-way valve, an outdoor heat exchanger, an expansion valve and an indoor heat exchanger. Discharge to the valve, by switching this four-way valve during cooling from the four-way valve to the outdoor heat exchanger, expansion valve, through the indoor heat exchanger to the four-way valve, and during heating from the four-way valve to the indoor heat exchanger, expansion valve, A cooling water circuit that circulates engine cooling water in an engine-driven heat pump air conditioner that has a refrigerant circuit configured to flow refrigerant to the four-way valve via the outdoor heat exchanger and return the refrigerant from the four-way valve to the compressor. A hot water circulation circuit for circulating hot water for supplying heat to the heat utilization device through a heat radiating portion to the heat utilization device, wherein the hot water circulation circuit absorbs engine waste heat from the cooling water circuit. Heat exchanger and the above cold In which it is disposed a second heat exchanger to absorb heat of the high-pressure side of the refrigerant circuit.

[0010] According to this configuration, the engine waste heat is given from the engine cooling water to the water in the hot water circulation circuit by the first heat exchanger, and the second heat is discharged when the required capacity of the indoor unit is small during operation. The heat of the high-pressure refrigerant is also given to the water flowing through the hot water circulation circuit in the exchanger, and the heat is supplied to the heat utilization equipment. Therefore, in addition to the engine waste heat, the heat generated in the refrigerant circuit is effectively used, and sufficient heat can be supplied to the heat utilization device.

[0009]

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

FIGS. 1 and 2 show an embodiment of an air conditioner of an engine driven heat pump type according to the present invention, which comprises an outdoor unit 1A shown in FIG. 1 and a plurality of rooms shown in FIG. And an indoor unit 1B provided in each R. The air conditioner includes a water-cooled gas engine 2 (hereinafter abbreviated as engine 2) and an engine 2
And a refrigerant circuit 30 for circulating a refrigerant, a cooling water circuit 80 for cooling the engine 2, and a hot water circulation circuit 100 for supplying heat to heat utilization equipment. ing.

An intake pipe 3 is connected to the engine 2.
An air cleaner 4 and a mixer 5 are connected to the intake pipe 3. A fuel supply pipe 6 connected to a fuel gas supply source (not shown) is connected to the mixer 5, and a flow control valve 7, a governor 8, and an electromagnetic valve 9 are interposed in the fuel supply pipe 6. . In the mixer 5, the supply amount of fuel gas and air to the engine is adjusted by the operation of the throttle by the pulse motor 5a. An oil tank 11 is connected to an oil pan of the engine 2 via an oil supply pipe 10.
Is provided with a solenoid valve 12 for adjusting the oil supply amount.

An exhaust pipe 13 extends from the engine 2, and an exhaust heat exchanger 14, an exhaust silencer 15, and a mist separator 16 are interposed in the exhaust pipe 13. Reference numeral 17 denotes a heater for adjusting the oil temperature in the oil pan of the engine 2, and reference numeral 18 denotes an exhaust gas heat exchanger 14.
And a drain treatment device for neutralizing drain water from the exhaust silencer 15 and the mist separator 16.

The compressor 20 comprises a multi-type compressor having two unit compressors 20a and 20b in the example shown in the figure. Each of the unit compressors 20a and 20b is an electromagnetic clutch 2a.
1 is connected to the output shaft 22 of the engine. 2
Reference numeral 3 denotes a heater for adjusting the oil temperature in the compressor 20.

The refrigerant circuit 30 passes the refrigerant discharged from the compressor 20 through a condenser, an expansion valve and an evaporator to the compressor 2.
This constitutes a closed circuit for circulating back to zero. In this embodiment, it is possible to switch between cooling and heating,
In addition, to configure an air conditioner capable of cooling and heating a plurality of rooms, the air conditioner includes a four-way valve 31 for switching a refrigerant circulation path, and a plurality of indoor heat exchangers 76.
Base circuit 32 constituting a circuit from 0 to four-way valve 31
The outdoor circuit 33 connected to the base circuit 32 through the four-way valve 31 and a plurality of indoor circuits 34 connected to the outdoor circuit 33 constitute the refrigerant circuit 30.

The base circuit 32 includes a discharge line 35 connecting the discharge port of the compressor 20 and the first port 31a of the four-way valve 31, a second port 31b of the four-way valve 31 and the compressor 2
And a suction-side line 36 connecting the suction port with the suction port No. 0. An oil separator 37 is installed on the discharge side line 35, and an accumulator 4 is mounted on the suction side line 36.
1 and a sub accumulator 42 are provided.

The oil separator 37 includes a heater 37
is provided, and the temperature of the oil separator 37 is adjusted by the heater 37a. Then, oil is supplied from the oil separator 37 via the strainer 38 to the capillary tube 39.
By the above, it is returned to the upstream side of the sub-accumulator 42, and is returned to the upstream side of the accumulator 41 via the electromagnetic valve 40. The solenoid valve 40 is opened when a large amount of oil flowing out of the compressor accumulates in the oil separator 37 after the start, and
Otherwise, it is closed.

A gas-phase and a liquid-phase refrigerant are contained in an accumulator 41 installed in the suction side line 36, and the gas-phase refrigerant is sent to a sub-accumulator 42 from a line 36c. A temperature sensor (not shown) is provided in each of the capillaries 45 and 47 to detect the liquid level of the liquid-phase refrigerant in the accumulator 41. 44 and 46 are strainers.

The liquid level of the liquid-phase refrigerant in the accumulator 41 can be reduced by reducing the valve opening of the electronic expansion valves 70a to 70d described later or by increasing the amount of hot water circulating to the heat exchanger 93. The heater 48 is a double capillary 4
5, 47, the liquid refrigerant passing through the strainers 44, 46 is vaporized. The oil and the liquid-phase refrigerant are sent from the lower part in the accumulator 41 to the sub-accumulator 42 via the line 36d, the strainer 49, the expansion valve 50, and the orifice 51 via the line 36e.

The sub-accumulator 42 is provided with a heater 52, and the heater 52 controls the liquid level of the sub-accumulator 42. The gas-phase refrigerant in the sub-accumulator 42 is driven by the compressor 20 to drive the line 36 g,
It is sucked through 36 f and the one-way valve 53. The oil and the liquid refrigerant accumulated in the sub-accumulator 42 are vaporized through the orifice 54 and are sucked into the compressor 20. The discharge side line 35 is connected to the suction side line 36 via a strainer 55 and a solenoid valve 56, and the solenoid valve 56 is opened when an abnormal pressure rises.

The line 33a of the outdoor circuit 33 is connected to the third port 31c of the four-way valve 31.
An outdoor heat exchanger 60 is installed in 3a. A branch / collector 64 is connected to the outdoor heat exchanger 60 via a line 33b in which a heat exchanger 61, a strainer 62 and a manual valve 63 provided in the accumulator 41 are arranged. A plurality of (for example, three) lines 65a, 65b,
65c are derived and these lines 65a, 65b, 6
Joints J1, J2, J3 are provided at each end of 5c. The lines 65a, 65b have electronic expansion valves 70a,
70b is interposed.

The fourth port 31d of the four-way valve 31 is connected to a branch / collector 6 via a line 33c in which a manual valve 66 is disposed.
7 is connected. Branch / collector 67 and line 33
A plurality of (for example, three) lines 68a, 68b, and 68c for connection to the indoor circuit 34 are derived from c, and joints J4, J5, and J6 are provided at respective ends of the lines 68a, 68b, and 68c. Is provided.

Further, bypass passages 69a and 69b are provided from the branch / collector 67 to the branch / collector 64 by bypassing the indoor circuit 34.
a and 69b are the second heat exchanger 102 and the electronic expansion valve 70 described later.
d is provided, and the second heat exchanger 102 is disposed upstream of the electronic expansion valve 70d during heating.

The suction side circuit 36 is connected to the line 33b of the outdoor circuit 33 via the expansion valve 71 and the strainer 72, and the discharge side circuit 35 is connected to the line 33b via the strainer 73, the solenoid valve 74 and the capillary tube 75. Connected.

On the other hand, as shown in FIG. 2, the indoor circuit 34 provided in each indoor unit 1B of the plurality of rooms R includes an indoor heat exchanger 76, and a line 77a, which communicates with one end of each indoor heat exchanger 76, 77b and 77c are joints J1 and J
2, J3 are connected to the lines 65a, 65b, 65c, while the lines 78a, 78b, 78c leading to the other end of each indoor heat exchanger 76 are connected to the joints J4, J5, J.
6 to lines 68a, 68b, 68c. The line 77c has an electronic expansion valve 70c
Is interposed.

As shown in FIG. 1, the cooling water circuit 80 has a heat exchanger composed of a water jacket 81 of the engine, an exhaust gas heat exchanger 14, a radiator 83, and the engine 2 and the radiator 83. Between them, cooling water passages 84 and 85 on the outward path and the return path are provided. The pump 8 provided in the middle of the passage 85
The cooling water is circulated by the pump 6 and the pump 87 provided on the inlet side of the water jacket 81. That is, the warm water after cooling the engine flowing out of the water jacket 81 to the passage 84 via the thermostat 88 is supplied to the radiator 8.
3, the cooling water after the heat radiation in the radiator 83 is guided to the engine through the passage 85, and the exhaust water heat exchanger 1
4 and flows into the water jacket 81.

Between the thermostat 88 provided on the outlet side of the water jacket 81 and the inlet side of the pump 87, there is provided a short-circuit passage 89 for directly returning the cooling water to the water jacket inlet side when the water temperature is low. I have. The radiator 83 includes a cooling fan 90.

In the middle of the passage 84, a linear three-way valve 91 is provided.
And a passage 9 branched from the linear three-way valve 91.
2 is connected to a heat exchanger 93 provided in the accumulator 41 of the refrigerant circuit 30, and a passage 94 passing through the heat exchanger 93 is connected in the middle of the passage 85. And
A part of the cooling water is diverted to the heat exchanger 93 by the linear three-way valve 91 and is used for heating the refrigerant in the accumulator 41.
Is controlled so that the cooling water flow ratio is controlled.

A first heat exchanger 101 is provided in the outward cooling water passage 84 between the linear three-way valve 91 and the radiator 83.
Is provided. Further, a thermostat 96 is provided between the heat exchanger 101 and the radiator 83, and a radiator bypass passage 97 is provided from the thermostat 96.
The downstream end of the radiator bypass passage 97 is connected to a return-side cooling water passage 85 between the radiator 83 and the pump 86.

The thermostat 96 operates according to the temperature of the cooling water passing through the first heat exchanger 101. When the temperature of the cooling water is equal to or lower than a first predetermined temperature, the entire amount of the cooling water flows through the radiator bypass passage 97. When the temperature exceeds the first set temperature, cooling water is also supplied to the radiator 83 so that a predetermined second
When the temperature is equal to or higher than the set temperature, the entire amount of the cooling water flows to the radiator 83.

In addition to the cooling water circuit 80, a hot water circulating circuit 1 for circulating hot water for supplying heat to heat utilization equipment
The hot water circulation circuit 100 includes an outdoor unit side passage 100a and joints J7, J
8 and an indoor unit side passage 100b connected through the air passage 8. As shown in FIG. 1, the first heat exchanger 101 and the second heat exchanger 102 are arranged in series in the outdoor unit side passage 100 a of the hot water circulation circuit 100, and are cooled by the first heat exchanger 101. While the engine waste heat is absorbed from the cooling water flowing through the passage 84 of the water circuit 80,
In the second heat exchanger 102, the bypass passage 69 of the refrigerant circuit 30
The heat is absorbed from the high-pressure side refrigerant flowing through a and 69b. Further, the outdoor unit side passage 100
a is provided with a pump 103 and a water inlet 104
And the recovery tank 105 are connected. With these, the hot water supply unit 100x of the hot water circulation circuit 100
Is formed and installed inside or outside the outdoor unit 1A.

As shown in FIG. 2, the indoor unit side passage 100b of the hot water circulation circuit 100 is connected to heat utilization equipment provided in each room R so as to supply hot water to a heat radiating portion to the heat utilization equipment. It is configured. That is, in the example illustrated in FIG. 2, as the heat utilization device, the floor heater 107 is provided in each of the two rooms R, the water heater 110 is provided in the other room R, and each room is provided in the indoor unit side passage 100b. Separate branch passages 106a, 106b, and 106c are provided.
6a and 106c are connected via an on-off valve 108, and a branch passage 10 is connected to a heat exchanger 111 in a water heater 110.
6b is connected. The water heater 110 is provided with a hot water tap 112, a city water introduction pipe 113, a relief valve 114, and the like.

According to the apparatus of the present embodiment as described above,
In the refrigerant circuit 30, the four-way valve 31 is switched according to the time of cooling and the time of heating, so that one of the outdoor heat exchanger 60 and the indoor heat exchanger 76 is a condenser and the other is an evaporator. Then, the refrigerant discharged from the compressor 20 is circulated so as to return to the compressor 20 via the condenser, the expansion valve, and the evaporator.

That is, during the cooling operation, the first port 31a and the third port 31c of the four-way valve 31 are connected, and the fourth port 31d and the second port 31b are connected. As a result, as shown by solid arrows in FIGS. 1 and 2, the refrigerant discharged from the compressor 20 driven by the engine 2 to the discharge side line 35 passes through the four-way valve 31 and becomes an outdoor After being led to the heat exchanger 60, where the heat is radiated and liquefied, the branch / collector 6
4. Each indoor unit 1B via joints J1 to J3, etc.
Through the electronic expansion valves 70a, 70b, 70c provided on the outdoor unit side or the indoor unit side,
The heat is guided to the indoor heat exchanger 76 serving as an evaporator, where the heat is absorbed and cooling is performed. And joints J4 ~ J
6. After passing through the branch / collector 67 and the like, flows through the four-way valve 31 to the suction side line 36, and is returned to the compressor 20.

During the heating operation, the first port 31a and the fourth port 31d of the four-way valve 31 are connected, and the third port 31c and the second port 31b are connected. As a result, the refrigerant discharged from the compressor 20 driven by the engine 2 to the discharge side line 35 flows from the four-way valve 31 to the line 33 as indicated by the broken line arrow in FIGS.
c, branch / collector 67, joints J4 to J6, etc., are sent to each indoor unit 1B, guided to an indoor heat exchanger 76 serving as a condenser, where they are radiated and liquefied, and the condensed heat is used for heating. Do. Then, it is guided to the outdoor heat exchanger 60 through the joints J1 to J3, the electronic expansion valves 70a, 70b, 70c, the branch / collector 64, etc., where it is absorbed and vaporized, and then passed through the four-way valve 31 to the suction side. Flows to line 36,
It is returned to the compressor 20 via the accumulators 41 and 42.

In the cooling water circuit 80, the engine is cooled by circulating the cooling water as shown by the arrow, and the engine waste heat is cooled in the exhaust gas heat exchanger 14 and the water jacket 81. The engine waste heat is supplied to the water that is absorbed by the water and circulates in the hot water circulation circuit 100 from the engine cooling water in the first heat exchanger 101. Further, during the heating operation, the second heat exchanger 36 also supplies heat to the water in the hot water circulation circuit 100 from the high-pressure side refrigerant.

That is, during the heating operation, the electronic expansion valve 70 provided in the bypass passage 69b of the refrigerant circuit 30
When d is opened to a certain degree, a part of the high-pressure refrigerant flowing from the four-way valve 31 to the branching / collecting portion 67 is partially bypassed.
9a, the second heat exchanger 102, the electronic expansion valve 70d, the bypass passage 69b, and the branching / collecting portion 64 to flow to the outdoor heat exchanger 60. As a result, the high-pressure refrigerant is radiated and condensed while passing through the second heat exchanger 102, the condensed heat is given to the water in the hot water circulation circuit 100, and
After passing through 02, the refrigerant is reduced in pressure by the electronic expansion valve 70d, and absorbed and evaporated by the outdoor heat exchanger 60.

When the required capacity on the indoor unit side is small due to a small number of operating indoor units 1B or the like, the opening degree of the electronic expansion valve 70d is slightly increased, the throttle is relaxed, and the refrigerant flow rate increases. By increasing the amount of heat radiation and condensation in the second heat exchanger 102, the degree of utilization of the heat of the surplus refrigerant is increased.

As described above, in addition to the engine waste heat, the heat of the refrigerant on the high pressure side of the refrigerant circuit 30 is effectively extracted, and the heat is transferred to each room R by the hot water of the hot water circulation circuit 100, and the heat of each room is removed. The heat is supplied to heat utilization equipment such as floor heater 107 and water heater 110 provided in R.

The electronic expansion valve 70d is closed during the heating operation, when the required capacity of the indoor unit is maximum, when the demand for using hot water is low, or during the cooling operation.

In the first embodiment, the bypass passages 69a, 69b and the like are configured so that the heat of the high-pressure refrigerant can be extracted by the second heat exchanger 102 only during heating. As an embodiment of the present invention, as shown by a two-dot chain line in FIG.
An electronic expansion valve 70e is provided in a bypass passage 69a between the second heat exchanger 102 and the electronic expansion valve 70e.
If the end of the bypass passage 69b passing through d is connected to the line 33a between the four-way valve 31 and the outdoor heat exchanger 60 so that the outdoor heat exchanger 60 is also bypassed,
The heat of the high-pressure refrigerant can be extracted at any time during cooling.

That is, in the case of the second embodiment, during the heating operation, the electronic expansion valve 70e is fully opened and the electronic expansion valve 70d is appropriately squeezed, so that the branching / collecting portion 67 is separated from the four-way valve 31. A part of the refrigerant flowing to the bypass passage 69a, the electronic expansion valve 70e, the second heat exchanger 102, the electronic expansion valve 70d, the bypass passage 69b,
Line 33a flows to the four-way valve 31, and the second heat exchanger 10
After the heat of condensation is extracted from the high-pressure refrigerant in 2, the pressure of the refrigerant is reduced by the appropriately expanded electronic expansion valve 70d, and is absorbed and evaporated by the accumulator 41.

On the other hand, during the cooling operation, the electronic expansion valve 70d
Is fully opened and the electronic expansion valve 70e is appropriately squeezed, so that the four-way valve 31
Part of the refrigerant flowing toward zero is bypass passage 69b, electronic expansion valve 70d, second heat exchanger 102, electronic expansion valve 70
e, bypass passage 69a, branching / collecting portion 67, four-way valve 3
After the condensed heat is extracted from the high-pressure refrigerant in the second heat exchanger 102, the refrigerant is reduced in pressure by the appropriately expanded electronic expansion valve 70 e and is absorbed and evaporated by the accumulator 41.

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

In the refrigerant circuit 30 in FIG. 3 showing a part of the outdoor unit 1A, a bypass passage 120a branched from the discharge line 35 between the compressor 20 and the four-way valve 31 reaches the second heat exchanger 102. Together with the second heat exchanger 10
The bypass passage 120b passing through 2 is connected to the suction side line 36 between the four-way valve 31 and the accumulator 41. A flow control valve 121 is provided in a bypass passage 120a upstream of the second heat exchanger 102, and an electronic expansion valve 122 is provided in a bypass passage 120b downstream of the second heat exchanger 102.

In the hot water circulation circuit 100, the first
The heat exchanger 101 and the second heat exchanger 102 are connected in parallel, and at the branch point of the passage to each of the heat exchangers 101 and 102,
A linear three-way valve 123 for adjusting the ratio of hot water flow to each of the heat exchangers 101 and 102 is provided.

According to this embodiment, a part of the refrigerant flowing through the discharge line 35 is supplied to the bypass passage 120a, the flow control valve 121, the second heat exchanger 102, the electronic expansion valve 122, and the bypass passage during heating and cooling, respectively. 120b, flows to the suction side line 36, and after the heat is extracted by the second heat exchanger 102, the pressure of the refrigerant is reduced by the electronic expansion valve 122, and the refrigerant is absorbed and evaporated by the accumulator 41. Then, the heat absorbed by the second heat exchanger 102, together with the heat absorbed by the first heat exchanger 101, passes through the hot water in the hot water circulation circuit 100,
It is supplied to the heat utilization equipment in each room.

Therefore, also in this embodiment, when heating or cooling, when the required capacity of the indoor unit is small, the heat of the high-pressure refrigerant is effectively used in addition to the engine waste heat. In addition, by controlling the linear three-way valve 123 according to the operating state and the like, the utilization ratio of the engine waste heat and the heat of the high-pressure refrigerant is adjusted.

[0048]

As described above, the engine driven heat pump air conditioner of the present invention is provided with the engine cooling water circuit and the hot water circulation circuit for supplying heat to the heat utilization equipment. Since the first heat exchanger that absorbs the engine waste heat from the cooling water circuit and the second heat exchanger that absorbs the heat of the refrigerant on the high pressure side of the refrigerant circuit are arranged, in addition to the engine waste heat, Effectively use the heat of the high-pressure refrigerant in the refrigerant circuit,
Sufficient heat can be supplied to heat utilization equipment.

[Brief description of the drawings]

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

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

FIG. 3 is a circuit diagram showing another embodiment.

[Explanation of symbols]

 2 engine 20 compressor 30 refrigerant circuit 31 four-way valve 60 outdoor heat exchanger 69a, 69b bypass passage 70a-70e electronic expansion valve 76 indoor heat exchanger 80 cooling water circuit 100 hot water circulation circuit 101 first heat exchanger 102 second heat Exchanger

Claims (1)

[Claims] 1. An engine-driven compressor, a four-way valve,
An outdoor heat exchanger, an expansion valve, and a refrigerant circuit having an indoor heat exchanger are provided.The refrigerant is discharged from the compressor to the four-way valve. The refrigerant flows through the indoor heat exchanger to the four-way valve, and during heating, the refrigerant flows from the four-way valve to the indoor heat exchanger, the expansion valve, the outdoor heat exchanger to the four-way valve, and returns the refrigerant from the four-way valve to the compressor. In the engine driven heat pump air conditioner having the refrigerant circuit configured as described above, the cooling water circuit for circulating the engine cooling water and the hot water for supplying heat to the heat utilization device are circulated through the heat radiation portion to the heat utilization device. A hot water circulation circuit, a first heat exchanger for absorbing engine waste heat from the cooling water circuit, and a second heat exchanger for absorbing heat of the refrigerant on the high pressure side of the refrigerant circuit. Characterized by the arrangement of Engine drive heat pump type air conditioner.