JPH11257794A - Outdoor unit and air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize an exhaust heat energy by stabilizing a heating capacity. SOLUTION: A cooling water system 50 of a gas engine 41 is constituted by a main cooling water circuit 50A for sequentially circulating a cooling water via the engine 41, a three-way valve 55 and a radiator 53, a refrigerant heating circuit 50B branched in parallel from the valve 55 between the engine 41 and the radiator 53, and a water heat exchanger 32 for heat exchanging the cooling water passing the circuit 50B with the refrigerant passing an outdoor heat exchanger 31. And, a thermo-valve 56 is disposed between the valve 55 and the radiator 53, and a radiator alternate circuit 50C branched from the thermo- valve 56 and connected in parallel to detour the radiator 53 is provided. And, an opening of the valve 55 is regulated in response to a superheat degree of the refrigerant in the exchanger 32, and an opening of the valve 56 is regulated in response to a temperature of the cooling water circulating via the system 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas heat pump type air conditioner in which a compressor is driven by a gas engine and exhaust gas of the gas engine is used as a heating source of a liquid refrigerant during a heating operation. .

[0002]

2. Description of the Related Art An air conditioner that performs cooling and heating using a heat pump includes a refrigerant circuit including elements such as an indoor heat exchanger, a compressor, an outdoor heat exchanger, and an expansion valve. Cooling and heating of the room is realized by exchanging heat in the indoor heat exchanger and the outdoor heat exchanger while the refrigerant passes through this circuit. Further, the refrigerant circuit may be provided with a refrigerant heater for directly heating the refrigerant itself, instead of relying solely on receiving the heat of the refrigerant by the outdoor heat exchanger (during the heating operation). .

In recent years, as a power source for a compressor in the above-described refrigerant circuit, a type using a gas engine instead of a commonly used electric motor has been developed. An air conditioner using this gas engine is generally called a gas heat pump type air conditioner (hereinafter abbreviated as GHP). According to this GHP, a relatively inexpensive gas can be used as fuel, so that the running cost does not increase as in an air conditioner (hereinafter abbreviated as EHP) equipped with a compressor using an electric motor. Costs can be reduced.

Further, in the GHP, for example, during heating operation, if the heat of the high-temperature exhaust gas discharged from the gas engine is used as a heating source for the refrigerant, it is possible to obtain an excellent heating effect, Use efficiency can be improved. By the way, the heating capacity at the time of low outside air temperature is about 1.2 to 1.5 times higher than the EHP. Also,
By introducing such a mechanism, in the refrigerant circuit,
It is not necessary to specially install equipment such as the above-described refrigerant heater.

[0005] In addition, in the GHP, the so-called defrosting operation of the outdoor heat exchanger required for the heating operation is also performed.
It can be carried out using the exhaust heat of the engine. Generally, in the defrost operation in the EHP, the heating operation is stopped, the cooling operation is temporarily performed, and the outdoor heat exchanger is defrosted. In this case, since the cool air is blown into the room, the comfort of the room environment is impaired. In the GHP, the continuous heating operation becomes possible due to the above-described circumstances, and there is no occurrence of a problem that is a concern in the EHP.

[0006]

As shown in FIG. 4, a GHP gas engine is cooled by cooling water circulated by a water pump 1, and a cooling water system 2 for this cooling is used. A main cooling water circuit 2A for circulating the cooling water discharged from the water pump 1 in the order of the exhaust gas heat exchanger 3, the engine body 4, the radiator 5, and the thermo valve 6, and a refrigerant heating circuit provided in parallel with the radiator 5. 2B and a water heat exchanger 8 for heating the refrigerant, which is disposed so as to straddle both the refrigerant heating circuit 2B and the refrigerant circuit 7.

[0007] The cooling water circulated through the main cooling water circuit 2A to recover heat from the exhaust gas and the engine main body 4 and a part of the high-temperature cooling water is released into the atmosphere by the radiator 5, and then discharged to the atmosphere. 4, and the remaining cooling water flows into the refrigerant heating circuit 2B and heats the refrigerant flowing through the refrigerant circuit 7 in the water heat exchanger 8, and then joins with the main cooling water circuit 2A to form an engine. It is reused for cooling the main body 4. These main cooling water circuit 2A and refrigerant heating circuit 2B
Is controlled by a thermo-valve 6 whose opening is adjusted according to the temperature of the cooling water.

However, this flow rate control is mainly performed from the viewpoint of how much cooling water should be introduced into the radiator 5 to release the heat, and the amount of water introduced into the water heat exchanger 8 should be positively controlled. In some cases, the refrigerant heating is not performed stably and the heating capacity becomes unstable. Further, there is also a problem that the heat recovered in the cooling water is not effectively used for heating the refrigerant and the heat loss is large.

The present invention has been made in view of the above circumstances, and has as its object to stabilize the heating capacity and to make effective use of waste heat energy.

[0010]

The present invention employs the following means in order to solve the above-mentioned problems. That is, the outdoor unit according to claim 1 includes an outdoor heat exchanger that performs heat exchange between the refrigerant and the outside air, a compressor that is driven by the gas engine and discharges a high-temperature and high-pressure gas refrigerant, and cooling water. A cooling water system that circulates and cools the gas engine, the cooling water system comprising: a main cooling water circuit that circulates the cooling water in the order of the gas engine, the three-way valve, and the radiator; A refrigerant heating circuit provided in parallel with the main cooling water circuit between the engine and the radiator, and heat between the cooling water passing through the refrigerant heating circuit and the refrigerant passing through the outdoor heat exchanger. A water heat exchanger for performing exchange, wherein an opening of the three-way valve is adjusted in accordance with a degree of superheating of the refrigerant in the water heat exchanger.

In this outdoor unit, the water heat exchanger and the radiator are arranged in series, and the water heat exchanger is located upstream of the radiator. Is introduced into the refrigerant heating circuit before the radiator. At this time, the introduced amount is adjusted by the three-way valve in accordance with the degree of superheat of the refrigerant in the water heat exchanger, so that stable refrigerant heating is always performed.

An air conditioner according to a second aspect of the present invention is an outdoor heat exchanger for exchanging heat between a refrigerant and outside air, a compressor driven by a gas engine to discharge a high-temperature and high-pressure gas refrigerant, and cooling water. Outdoor unit comprising a cooling water system for circulating air and cooling the gas engine, a fan for sucking air from the room and blowing it out from the outlet, and a refrigerant supplied from the outdoor unit and sucked by the fan An indoor unit that includes an indoor heat exchanger that causes heat to be exchanged between the air and the cooling air system.
A main cooling water circuit for circulating the cooling water in the order of the gas engine, the three-way valve, and the radiator; and a branching branch from the three-way valve and provided between the gas engine and the radiator in parallel with the main cooling water circuit. Refrigerant heating circuit, and a water heat exchanger for performing heat exchange between cooling water passing through the refrigerant heating circuit and the refrigerant passing through the outdoor heat exchanger, and the three-way valve includes the water heat The opening is adjusted in accordance with the degree of superheat of the refrigerant in the exchanger.

[0013] In this air conditioner, in the outdoor unit, the cooling water recovered from the gas engine is introduced into the refrigerant heating circuit prior to the radiator, and the amount of the introduced cooling water is determined by the overheating of the refrigerant in the water heat exchanger. Since the refrigerant is adjusted by the three-way valve according to the degree, stable refrigerant heating is always performed. Therefore, a comfortable heating state is maintained even when the required heating capacity increases or decreases during the heating operation.

According to a third aspect of the present invention, in the air conditioner of the second aspect, the cooling water system includes a thermo-valve disposed between the three-way valve and the radiator, and a branch from the thermo-valve. A radiator detour provided in parallel so as to bypass the radiator, wherein an opening of the thermo valve is adjusted according to a temperature of cooling water circulating in the cooling water system. It is.

In this air conditioner, the amount of cooling water introduced into the radiator is adjusted by the thermo valve in accordance with the temperature of the cooling water circulating through the cooling water system. The heat recovered from the gas engine is effectively used for heating the refrigerant, which stabilizes the heating of the refrigerant and significantly reduces exhaust heat loss.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The GHP (gas heat pump type air conditioner) 1 shown in FIG. 1 is mainly composed of an indoor unit 10 and an outdoor unit 20. The indoor unit 10 has an indoor heat exchanger that evaporates and evaporates a low-temperature and low-pressure liquid refrigerant to remove heat from indoor air during a cooling operation, and condenses and liquefies a high-temperature and high-pressure gas refrigerant during a heating operation to warm indoor air. 11 are provided.

The outdoor unit 20 includes a refrigerant circuit section 30 inside which a refrigerant circuit is further formed, and a gas engine 4.
The gas engine unit 40 mainly includes a gas engine unit 40 and has components attached thereto.

In the refrigerant circuit section 30, the outdoor heat exchanger 3 is provided.
1, water heat exchanger 32, compressor 33, accumulator 3
4. Four-way valve 35, oil separator 36, and expansion valve 3
7 is provided. The outdoor heat exchanger 31 condenses and liquefies the high-temperature and high-pressure gas refrigerant during the cooling operation and radiates heat to the outdoor air, and conversely evaporates the low-temperature and low-pressure liquid refrigerant during the heating operation to take heat from the outdoor air. In other words, the outdoor heat exchanger 31 performs the opposite operation of the indoor heat exchanger 11 during each of the cooling and heating operations.

The water heat exchanger 32 is provided for a refrigerant to recover heat from cooling water of a gas engine 41 described later. That is, at the time of the heating operation, the refrigerant does not rely only on the heat exchange in the outdoor heat exchanger 31 but also receives heat from the cooling water of the gas engine 41, so that the effect of the heating operation can be further enhanced. It becomes possible.

The compressor 33 compresses the gas refrigerant sucked from either the indoor heat exchanger 11 or the outdoor heat exchanger 31 and discharges it as a high-temperature and high-pressure gas refrigerant. Thus, during cooling, even if the outside air temperature is high, the refrigerant can radiate heat to the outdoor air through the outdoor heat exchanger 31, and during heating, it is possible to apply heat to the indoor air through the indoor heat exchanger 11.

The accumulator 34 is provided for storing a liquid component contained in the gas refrigerant flowing into the compressor 33. The four-way valve 35 is provided for selectively sending out the high-temperature and high-pressure gas refrigerant compressed in the compressor 33 to either the indoor heat exchanger 11 or the outdoor heat exchanger 31.

The oil separator 36 separates oil contained in the refrigerant. Further, the expansion valve 37 is for decompressing and expanding the high-temperature and high-pressure liquid refrigerant sent from the outdoor heat exchanger 31 during the cooling operation to make it a low-temperature and low-pressure liquid refrigerant.

On the other hand, in the gas engine section 40, a cooling water system 50, an exhaust gas system 60,
Four systems, a fuel intake system 70 and an engine oil system 80, are provided. The gas engine 41 is connected to a compressor 33 installed in the refrigerant system 30 by a shaft or a belt or the like.
Power is transmitted to the vehicle.

The cooling water system 50 is a system for cooling the gas engine 41 with the cooling water circulated by the water pump 51. The cooling water discharged from the water pump 51 is used for cooling the exhaust gas heat exchanger 54 and the engine body 41a. , Three-way valve 5
5, a main cooling water circuit 50A that circulates in the order of the thermo valve 56 and the radiator 53, a refrigerant heating circuit 50B provided in parallel between the engine main body 41a and the radiator 53 via a three-way valve 55, and a thermo valve 56. A radiator detour 50C is provided in parallel so as to bypass the radiator 53 via the radiator 53, and a reserve circuit 50D is provided in parallel between the radiator 53 and the water pump 51.

A radiator 53 provided in the main cooling water circuit 50A is integrally formed with the outdoor heat exchanger 31, and discharges the heat taken by the cooling water from the exhaust gas and the gas engine 41 to the outside air. It is provided in order to. In the refrigerant heating circuit 50B, the water heat exchanger 32 described above is provided.
Is disposed so as to straddle both the refrigerant system 30 and the cooling water system 50 including the refrigerant heating circuit 50B.

A reservoir tank 52 is provided in the reserve circuit 50D. This reservoir tank 52
In addition to temporarily storing the surplus cooling water flowing through the main cooling water circuit 50A, when the cooling water is insufficient in the main cooling water circuit 50A, the temporarily stored cooling water is supplied. .

The exhaust gas heat exchanger 54 is a gas engine 4
The cooling water is provided for recovering the heat of the exhaust gas discharged from the cooling water 1. Thus, during the heating operation, the cooling water not only removes heat from the gas engine 41 but also recovers heat from the exhaust gas, and the recovered heat is given to the refrigerant from the cooling water through the water heat exchanger 32. It works.

The opening of the three-way valve 55 is adjusted in accordance with the degree of superheating of the refrigerant in the water heat exchanger 32, and recovers heat from the exhaust gas and the gas engine 41 to increase the temperature of the cooling water water heat exchanger 32. To control the amount introduced into the system. The degree of superheat of the refrigerant depends on the temperature of the refrigerant in the water heat exchanger 32 and the water heat exchanger 3.
2 is defined by the deviation from the outlet-side refrigerant temperature, and the opening of the three-way valve 55 is adjusted based on the deviation.

The thermo valve 56 is connected to the engine body 41a.
After passing through the cooling water circuit 50B, the cooling water that has joined the main cooling water circuit 50A and the cooling water that has flowed through the main cooling water circuit 50A without passing through the refrigerant heating circuit 50B The degree of opening is adjusted according to the temperature to control the amount of the mixed flow introduced into the radiator 53.

The exhaust gas system 60 includes a muffler 61, an exhaust top 62, and a drain filter 63.
This is a system for guiding exhaust gas discharged from the outside to the outside.
The muffler 61 is provided to absorb noise caused when the gas engine 41 discharges exhaust gas. The exhaust top 62 separates moisture contained in the exhaust gas,
This is provided so as not to be scattered to the external environment. From the viewpoint of this function, the exhaust top 62 is sometimes called an exhaust separator. The drain filter 63 is provided for temporarily storing the drain water d separated from the exhaust top 62 just described. Further, a neutralizing agent is provided inside the drain filter 63. This corresponds to the fact that the moisture contained in the exhaust gas is generally strongly acidic, and is provided for the purpose of neutralizing the acidic moisture and rendering it harmless.

The fuel intake system 70 includes a gas regulator 7
1, solenoid valve 72, intake box 73, air cleaner 74
And a system for supplying fuel and air to the gas engine 41. The gas regulator 71 is provided for adjusting the delivery pressure of gas supplied from outside the outdoor unit 20 via the electromagnetic valve 72. On the other hand, the intake box 73 is provided to take in air from outside the outdoor unit 20. In addition, the intake box 73
Also has a function of preventing the noise generated at the time of intake. The air cleaner 74 is provided for removing dust from the air thus sucked. As described above, the gas and air supplied from the outside are respectively shown in FIG.
As shown in the figure, the gas regulator 71 and the air cleaner 7
After passing through No. 4, they are mixed and sent to the gas engine 41 to be used as fuel.

The engine oil system 80 has an oil sub-tank 81 and is provided for supplying lubricating oil to the gas engine 41. An oil pan 41 a is provided below the gas engine 41 to receive the oil in the oil sub tank 81.

The outdoor unit 20 of the above configuration
2 and 3 are housed in an outdoor unit housing 21 as shown in FIGS. As shown in these figures, the interior of the outdoor unit housing 21 is
, The upper and lower parts are divided into two. Now, these upper and lower spaces will be referred to as a heat exchange room 23 and a machine room 24, respectively. In FIGS. 2 and 3, the illustration of the piping described with reference to FIG. 1 is omitted.

The heat exchange chamber 23 is provided with an outdoor heat exchanger 31 and a radiator 53 so as to cover all the front and back surfaces of the outdoor unit housing 21. The outdoor heat exchanger 31 and the radiator 53 have an integral structure as described above. The heat exchange chamber 23 includes a muffler 61, an exhaust top 62, an intake box 73, and the like among the elements shown in FIG. Incidentally, the muffler 61 and the exhaust top 62 shown in FIG.
Is not shown in FIG.

In the heat exchange chamber 23, in addition to the components described above, a fan 91, a fan motor 92, and a fan fixture 9 are provided.
3 are provided. The fan 91 is attached to an output shaft of a fan motor 92 attached to a fan attachment 93 suspended from a ceiling surface of the outdoor unit housing 21. In the present embodiment, two sets of the fans 91 are mounted. Openings 94 are formed in the ceiling surface of the outdoor unit housing 21 so as to correspond to the mounting positions of the fans 91.
The opening 94 is provided with a mesh cover 95. The fan 91 assists the operation of the outdoor heat exchanger 31.

In the heat exchange chamber 23, two ventilation boxes 96 are provided on the partition plate 22, and a ventilation fan 97 is provided inside each of them. The ventilation box 96 and the ventilation fan 97 are provided to guide heat inside the machine room 24 to the heat exchange room 23. Therefore, the air heated in the machine room 24 is supplied to the ventilation fan 9.
6. The air is discharged to the outside of the outdoor unit housing 21 through the path of the heat exchange chamber 23 and the fan 91. Note that the intake box 73 is placed above the two ventilation boxes 96, and the air sucked from the intake box 73 reaches the gas engine 41 through the space between the two ventilation boxes 96. I have.

Next, the machine room 24 will be described.
Most of the components described in FIG. 1 and the components of each system are accommodated in the machine room 24. 2 and 3, the compressor 33, the accumulator 34, the four-way valve 35, and the oil separator 36 in the refrigerant circuit unit 30 and the gas engine 41, the drain filter 63, and the air cleaner 74 in the gas engine unit 40 are shown. Are shown respectively.

In the machine room 24, a drain pipe 101 is provided in addition to the above components. The drain pipe 101 is a pipe that connects the opening 22 a provided in the partition plate 22 and the floor opening 25 of the outdoor unit housing 21.
This is achieved by the outdoor unit housing 2 through the ceiling opening 94 described above.
1 is provided to discharge rainwater that has entered inside to the exterior of the outdoor unit housing 21.

In the machine room 24, a base plate 102,
An anti-vibration rubber 103 is provided. The base plate 102 is a substantially square plate, and is used as a floor on which the components in the refrigerant circuit unit 30 and the gas engine unit 40 housed in the machine room 24 are mounted. This base plate 10
At the four corners of the lower surface 2, anti-vibration rubber 103 is arranged. Accordingly, the base plate 102 and the vibration isolating rubber 103 have a function of suppressing mechanical vibration generated from the refrigerant circuit unit 30 and the gas engine unit 40 placed above the base plate 102 and the vibration isolating rubber 103.

The operation of the GHP 1 having the above-described configuration during the operation of each of the indoor cooling and the heating will be described. First, at the time of cooling operation (the broken line arrow in FIG. 1)
, The four-way valve 35 of the refrigerant circuit 30
And the outdoor heat exchanger 31, and the indoor heat exchanger 11 and the accumulator 34 are connected to each other. In this state, the high-temperature and high-pressure gas refrigerant discharged from the compressor 33 is sent to the outdoor heat exchanger 31.

The high-temperature and high-pressure gas refrigerant is condensed and liquefied in the outdoor heat exchanger 31 and radiates heat to outdoor air to become a high-temperature and high-pressure liquid refrigerant. Further, the high-temperature and high-pressure liquid refrigerant is reduced in pressure in the process of passing through the expansion valve 37, becomes a low-temperature and low-pressure liquid refrigerant, and sent to the indoor unit 10.

The low-temperature and low-pressure liquid refrigerant sent to the indoor unit 10 is evaporated and vaporized in the indoor heat exchanger 11, cools by removing heat from the indoor air, and then becomes a low-temperature and low-pressure gas refrigerant. The refrigerant is sent to the refrigerant circuit section 30 in the inside 20.

The low-temperature and low-pressure gas refrigerant sent to the refrigerant circuit section 30 flows into the accumulator 34 via the four-way valve 35,
After the liquid component is separated, it is sucked into the compressor 33. The gas refrigerant sucked into the compressor 33 is compressed by the operation of the compressor 33, becomes a high-temperature and high-pressure gas refrigerant, and is sent to the outdoor heat exchanger 31 again.

On the other hand, during the heating operation (solid arrow in FIG. 1), the four-way valve 35 is connected to the compressor 33 and the indoor heat exchanger 1.
1. The outdoor heat exchanger 31 and the accumulator 34 are connected to each other. In this state, the high-temperature and high-pressure gas refrigerant discharged from the compressor 33 is sent to the indoor heat exchanger 11 of the indoor unit 10.

The high-temperature and high-pressure gas refrigerant is condensed and liquefied in the indoor heat exchanger 11, radiates heat to indoor air and is heated, and then becomes a high-temperature and high-pressure liquid refrigerant and is sent to the refrigerant circuit unit 30 in the outdoor unit 20. Can be The high-temperature and high-pressure liquid refrigerant sent to the refrigerant circuit unit 30 flows into the outdoor heat exchanger 31. In the outdoor heat exchanger 31, the high-temperature and high-pressure liquid refrigerant takes heat from the outside air and evaporates to become a low-temperature and low-pressure gas refrigerant.

The low-temperature and low-pressure gas refrigerant flows into the water heat exchanger 32 and exchanges heat with the engine cooling water to be further heated to a high-temperature and high-pressure gas refrigerant. The high-temperature and high-pressure gas refrigerant flows into the accumulator 34, where the liquid component is separated, and then sucked into the compressor 33. The gas refrigerant sucked into the compressor 33 is compressed, becomes a high-temperature and high-pressure gas refrigerant, and is sent to the indoor heat exchanger 11 again.

On the other hand, in the cooling water system 50, the cooling water discharged from the water pump 51 circulates through the main cooling water circuit 50A to cool the engine main body 41a, and the degree of superheat of the refrigerant in the water heat exchanger 32. The opening degree of the three-way valve 55 is adjusted according to the flow rate of the cooling water guided to the refrigerant heating circuit 50B, and the flow rate of the cooling water flowing through the main cooling water circuit 50A without passing through the refrigerant heating circuit 50B is controlled. You.

When the cooling water that has joined the main cooling water circuit 50A via the refrigerant heating circuit 50B and the cooling water that has passed through the main cooling water circuit 50A without passing through the refrigerant heating circuit 50B are mixed. The degree of opening of the thermo valve 56 is adjusted according to the temperature of the mixed flow to control the radiator 53 and the flow rate guided to the radiator bypass 50C that bypasses the radiator 53.

Thus, in the cooling water system 50 of the present embodiment, the water heat exchanger 32 and the radiator 53 are arranged in series, and the water heat exchanger 32 is located upstream of the radiator 53. Therefore, the cooling water having recovered heat from the gas engine 41 is supplied to the refrigerant heating circuit 5 before the radiator 53.
0B, and the amount of the introduction is adjusted by the three-way valve 55 in accordance with the degree of superheating of the refrigerant in the water heat exchanger 32, so that stable refrigerant heating is always performed. Therefore, a comfortable heating state can be stably maintained even when the required heating capacity increases or decreases during the heating operation.

Further, a radiator detour 50C that does not pass through the radiator 53 is provided in the cooling water system 50, and the radiator 5
3 is adjusted by the thermo valve 56 in accordance with the temperature of the cooling water circulating in the cooling water system 50, so that the heat recovered from the gas engine 41 without unnecessarily lowering the temperature of the cooling water. Is effectively used for heating the refrigerant, and in addition to stabilizing the heating of the refrigerant, the waste heat loss can be significantly reduced and the effective use of the waste heat energy can be achieved.

[0051]

As described above, according to the GHP of the present invention, the following effects can be obtained. (1) In the outdoor unit according to the first aspect, since the water heat exchanger and the radiator are arranged in series and the water heat exchanger is located on the upstream side of the radiator, heat from the gas engine can be obtained. The recovered cooling water can be introduced into the refrigerant heating circuit before the radiator. In addition, since the introduced amount is adjusted by the three-way valve in accordance with the degree of superheating of the refrigerant in the water heat exchanger, stable and stable refrigerant heating can be performed.

(2) In the air conditioner according to the second aspect, in the outdoor unit, the cooling water having recovered heat from the gas engine is introduced into the refrigerant heating circuit before the radiator, and the amount of the introduced cooling water is reduced. Since the three-way valve is used to adjust the degree of superheat of the refrigerant in the water heat exchanger, stable refrigerant heating can be performed at all times. Therefore, a comfortable heating state can be maintained even when the required heating capacity increases or decreases during the heating operation.

(3) In the air conditioner according to the third aspect, a radiator bypass that does not pass through the radiator is provided in the cooling water system of the engine, and the cooling water is introduced into the radiator according to the temperature of the cooling water circulating in the cooling water system. Since the amount is adjusted by the thermo valve, the heat recovered from the gas engine can be effectively used for refrigerant heating without unnecessarily lowering the temperature of the cooling water. In addition, waste heat loss can be significantly reduced, and effective use of waste heat energy can be achieved.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the outdoor unit in the embodiment.

FIG. 3 is a cross-sectional view of the outdoor unit in the embodiment.

FIG. 4 is a main part enlarged refrigerant circuit diagram showing an enlarged main part of a conventional example of a refrigerant circuit diagram.

[Explanation of symbols]

 Reference Signs List 10 indoor unit 11 indoor heat exchanger 20 outdoor unit 31 outdoor heat exchanger 32 water heat exchanger 33 compressor 41 gas engine 50 cooling water system 50A main cooling water circuit 50B refrigerant heating circuit 50C radiator bypass circuit 53 radiator 55 three-way valve 56 Thermo valve 91 Fan

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Saburo Kawaguchi 1 Chuo Engineering Co., Ltd.

Claims (3)

[Claims] An outdoor heat exchanger for exchanging heat between a refrigerant and outside air, a compressor driven by a gas engine to discharge a high-temperature and high-pressure gas refrigerant, and cooling the gas engine by circulating cooling water. A cooling water system that circulates the cooling water in the order of the gas engine, the three-way valve, and the radiator; and a branch between the three-way valve and the gas engine and the radiator. A refrigerant heating circuit provided in parallel with the main cooling water circuit, and water heat exchange for performing heat exchange between the cooling water passing through the refrigerant heating circuit and the refrigerant passing through the outdoor heat exchanger. An outdoor unit, wherein an opening of the three-way valve is adjusted according to a degree of superheating of the refrigerant in the water heat exchanger. 2. An outdoor heat exchanger for exchanging heat between a refrigerant and outside air, a compressor driven by a gas engine to discharge a high-temperature and high-pressure gas refrigerant, and cooling the gas engine by circulating cooling water. An outdoor unit including a cooling water system that performs cooling, a fan that sucks air from the room and blows out from the outlet, and heat exchanges between the refrigerant supplied from the outdoor unit and the air sucked by the fan. An indoor unit that includes an indoor heat exchanger that performs a cooling operation. The cooling water system includes a main cooling water circuit that circulates the cooling water in the order of the gas engine, the three-way valve, and the radiator; A refrigerant heating circuit branched from a three-way valve and provided in parallel with the main cooling water circuit between the gas engine and the radiator, and cooling water and the outdoor heat exchange passing through the refrigerant heating circuit And a water heat exchanger for performing heat exchange with the refrigerant that has passed through the three-way valve, wherein the opening of the three-way valve is adjusted according to the degree of superheat of the refrigerant in the water heat exchanger. Air conditioner. 3. The cooling water system includes: a thermo valve disposed between the three-way valve and the radiator; and a radiator detour provided in parallel so as to branch off from the thermo valve and bypass the radiator. The air conditioner according to claim 2, wherein an opening of the thermo valve is adjusted according to a temperature of cooling water circulating in the cooling water system.