JP2003114069A - Gas heat pump type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the air conditioning performance of an air conditioner by reducing the pressure loss as much as possible in a refrigerant pipe constituting a refrigerant circuit. SOLUTION: In the gas heat pump type air conditioner, a refrigerant is circulated by a compressor 11 with a gas engine GE as the drive source to form a refrigerant cycle, and waste heat discharged from the gas engine GE is recovered in engine cooling water, by which the refrigerant is heated to increase the heating performance. The gas heat pump type air conditioner has the refrigerant pipe 2a for guiding the refrigerant, heated in a water heat exchanger 13 for the heat exchange between the engine cooling water and the refrigerant, to the compressor 11 without via a four-way valve 18.

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 for driving a compressor for circulating a refrigerant using a gas engine as a drive source.

[0002]

2. Description of the Related Art An air conditioner that uses a heat pump to perform air conditioning such as heating and cooling is provided with a refrigerant circuit including elements such as an indoor heat exchanger, a compressor, an outdoor heat exchanger, and a throttle mechanism. The cooling and heating of the room is done while the refrigerant goes around this circuit.
It is realized by exchanging heat with indoor air (hereinafter referred to as "indoor air") and outside air in the indoor heat exchanger and the outdoor heat exchanger, respectively. Further, in this refrigerant circuit, a heat exchanger that uses engine exhaust heat to heat the refrigerant is installed instead of relying only on the receipt of heat of the refrigerant by the outdoor heat exchanger (during heating operation).

By the way, in recent years, as a power source for a compressor provided in the above-mentioned refrigerant circuit, a gas engine has been developed in place of a normally used electric motor. The air conditioner using this gas engine is
Generally, a gas heat pump type air conditioner (hereinafter referred to as "GH
Abbreviated as "P"). According to this GHP, since city gas or the like, which is relatively inexpensive, can be used as fuel, running costs are high like an air conditioner (hereinafter abbreviated as “EHP”) equipped with a compressor that uses an electric motor. Therefore, the cost can be reduced for consumers.

Further, in the GHP, for example, during heating operation, if the heat (so-called waste heat) of the high temperature exhaust gas discharged from the gas engine or the engine cooling water is used as the heat source of the refrigerant, an excellent heating effect is obtained. In addition to being able to obtain it, it is possible to improve the energy utilization efficiency as compared with EHP. By the way, in this case, GHP
The energy utilization efficiency of 1.2 to 1.
5 times higher.

An example of the structure of a conventional GHP is shown in FIG.
Regarding the components overlapping with the GHP according to the present invention, it will be handed over to the embodiments described later. In the conventional GHP,
The water heat exchanger 13 includes the indoor heat exchanger 1 a and the outdoor heat exchanger 12 via the electronic expansion valve 1 b, the operation valve 21, and the receiver 15.
Is provided in a refrigerant pipe 101 that branches from a refrigerant pipe 2 that connects with the refrigerant pipe 2 a.
2 and the four-way valve 18 are connected so as to join the refrigerant pipe 2. That is, the outdoor heat exchanger 12 and the water heat exchanger 13 are connected in parallel.

In the conventional GHP, a check valve 102 is provided in the refrigerant pipe 101 on the downstream side of the water heat exchanger 13 so that the refrigerant does not flow from the outdoor heat exchanger 12 into the water heat exchanger 13 during the cooling operation. It is provided.

[0007]

DISCLOSURE OF THE INVENTION The above-mentioned conventional GHP
Since the water heat exchanger 13 is provided, the refrigerant circuit is more complicated than the EHP, and the pressure loss in the refrigerant pipe is large. When the pressure loss is large, there is a problem that the circulation of the refrigerant is hindered and the function of the refrigerant circuit becomes sluggish, and particularly the heating operation capacity and the heating efficiency using the water heat exchanger 13 do not increase. Further, in the conventional GHP, since the check valve 102 has a structure for preventing the introduction of the refrigerant into the water heat exchanger 13 during the cooling operation, the defrost operation basically follows the same refrigeration cycle as during the cooling operation. At times, the waste heat of the engine cooling water recovered by the water heat exchanger 13 cannot be used.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to improve the air-conditioning capacity by reducing the pressure loss in the refrigerant pipe forming the refrigerant circuit as much as possible. .

[0009]

The present invention adopts the following means in order to solve the above problems. The gas heat pump type air conditioner according to claim 1 forms a refrigeration cycle by circulating a refrigerant in a compressor driven by a gas engine, and recovers waste heat discharged from the gas engine to engine cooling water. Along with, in a gas heat pump type air conditioner configured to heat the refrigerant by the engine cooling water to increase the heating capacity, it is heated in a water heat exchanger that exchanges heat between the engine cooling water and the refrigerant. A refrigerant flow path for introducing the refrigerant into the compressor without passing through a four-way valve is provided.

A gas heat pump type air conditioner according to a second aspect of the present invention forms a refrigeration cycle by circulating a refrigerant in a compressor having a gas engine as a drive source, and waste heat discharged from the gas engine is cooled by engine cooling water. As well as collect
In the gas heat pump type air conditioner configured to heat the refrigerant by the engine cooling water to increase the heating capacity, the introduction of the refrigerant to the indoor heat exchanger is cut off, and heat is radiated to the outside air in the outdoor heat exchanger. The refrigerant that has been defrosted in the outdoor heat exchanger is all introduced into a water heat exchanger that performs heat exchange between the engine cooling water and the refrigerant, and the refrigerant introduced into the water heat exchanger is cooled by the engine. It is characterized by heating with water.

A gas heat pump type air conditioner according to a third aspect of the present invention forms a refrigeration cycle by circulating a refrigerant in a compressor having a gas engine as a driving source, and waste heat discharged from the gas engine is cooled by engine cooling water. As well as collect
In a gas heat pump type air conditioner configured to heat a refrigerant by the engine cooling water to increase a heating capacity, the introduction amount of the refrigerant to the indoor heat exchanger is limited, and the outdoor heat exchanger radiates heat to the outside air. Part of the refrigerant that has been defrosted in the outdoor heat exchanger is introduced into a water heat exchanger that performs heat exchange between the engine cooling water and the refrigerant, and the refrigerant introduced into the water heat exchanger Is heated by the engine cooling water.

In the gas heat pump type air conditioner according to a fourth aspect of the present invention, a refrigeration cycle is formed by circulating a refrigerant in a compressor having a gas engine as a drive source, and waste heat discharged from the gas engine is used as engine cooling water. As well as collect
In a gas heat pump type air conditioner configured to heat a refrigerant by the engine cooling water to increase heating capacity, a refrigerant in which defrosting of the outdoor heat exchanger is performed by radiating heat to the outside air in the outdoor heat exchanger. Is introduced into a water heat exchanger that exchanges heat between the engine cooling water and the refrigerant, and the refrigerant introduced into the water heat exchanger is heated by the engine cooling water.

A gas heat pump type air conditioner according to a fifth aspect is the gas heat pump type air conditioner according to any one of the first to fourth aspects, wherein the refrigerant is prevented from flowing into the water heat exchanger during a cooling operation. A valve mechanism is provided.

In the present invention, by introducing the refrigerant heated in the water heat exchanger into the compressor without passing through the four-way valve, the pressure loss becomes smaller than in the conventional case. As a result, the heating capacity and the heating efficiency can be improved during the heating operation. During defrost operation, the stop time of indoor air conditioning due to defrost removal is shortened.

In the present invention, all or part of the defrosted refrigerant in the outdoor heat exchanger is introduced into the water heat exchanger by radiating heat to the outside air in the outdoor heat exchanger.
The refrigerant introduced into the water heat exchanger is heated by the engine cooling water, and the waste heat of the engine cooling water is used to perform the frost removing operation.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a gas heat pump type air conditioner (hereinafter referred to as "GHP") according to the present invention will be described below with reference to the drawings. [First Embodiment] FIG. 1 is a system diagram showing an overall configuration example (at the time of heating operation) of a GHP as a first embodiment according to the present invention. The outdoor unit 10 including a compressor and the like is provided. In addition, a refrigerant pipe 2 is provided between the indoor unit 1 and the outdoor unit 10 in which one or more units are installed.
The refrigerant is circulated so that it can be circulated.

The indoor unit 1 functions as an evaporator that evaporates the low-temperature low-pressure liquid refrigerant to evaporate heat from the indoor air (indoor air) during cooling operation, and condenses and liquefies the high-temperature high-pressure gas refrigerant during heating operation. The indoor heat exchanger 1a that functions as a condenser that warms the indoor air is provided.
In the illustrated example, an electronic expansion valve (valve mechanism) 1b is provided for each indoor heat exchanger 1a.

The outdoor unit 10 has
It is divided into two large components. The first component part is a part that forms a refrigerant circuit with the indoor unit 1 centering on devices such as a compressor and an outdoor heat exchanger, and will be referred to as a "refrigerant circuit part" hereinafter. In addition, the second component part is a part provided mainly with the gas engine for driving the compressor and the devices associated therewith, and is hereinafter referred to as a "gas engine part".

In the refrigerant circuit section, a compressor 11, an outdoor heat exchanger 12, a water heat exchanger 13, an accumulator 14, a receiver 15, an oil separator 16, a throttle mechanism 17, a four-way valve 18, a solenoid valve 19, and a check valve. 20, a control valve 21 and the like are provided, and each is connected by a refrigerant pipe 2.

The compressor 11 is a gas engine GE which will be described later.
The low temperature low pressure gas refrigerant sucked from either the indoor heat exchanger 1a or the outdoor heat exchanger 12 is compressed and discharged as a high temperature high pressure gas refrigerant. As a result, during the cooling operation, the refrigerant can radiate heat to the outside air through the outdoor heat exchanger 12 even when the outside air temperature is high. Further, during the heating operation, it becomes possible to apply heat to the indoor air through the indoor heat exchanger 1a.

The outdoor heat exchanger 12 functions as a condenser that condenses and liquefies the high-temperature and high-pressure gas refrigerant to radiate the outside air during the cooling operation, and conversely evaporates and evaporates the low-temperature and low-pressure liquid refrigerant from the outside air during the heating operation. It functions as an evaporator that takes away. In other words, during each operation of cooling and heating,
The outdoor heat exchanger 12 works in the opposite manner to the indoor heat exchanger 1a.

The water heat exchanger 13 is provided for allowing the refrigerant to recover heat from the engine cooling water of the gas engine GE described later. That is, during the heating operation, the refrigerant not only depends on the heat exchange in the outdoor heat exchanger 12 but also recovers the waste heat from the engine cooling water of the gas engine GE, so that the effect of the heating operation is further enhanced. It becomes possible.

The water heat exchanger 13 is a refrigerant pipe (refrigerant flow) branched from a refrigerant pipe 2 connecting the indoor heat exchanger 1a and the outdoor heat exchanger 12 via an electronic expansion valve 1b, an operation valve 21 and a receiver 15. Road) 2a. Water heat exchanger 1
The refrigerant pipe 2 a passing through 3 is connected to the compressor 11 via the accumulator 14 without passing through the four-way valve 18.

A solenoid valve 23 for connecting and disconnecting the introduction of the refrigerant to the outdoor heat exchanger 12 is provided in the refrigerant pipe 2 arranged between the branch portion of the refrigerant pipe 2a and the outdoor heat exchanger 12. There is. Further, the branch portion with the refrigerant pipe 2 and the water heat exchanger 13
In the refrigerant pipe 2a arranged between the water heat exchanger 13 and
An electromagnetic valve 24 is provided for connecting and disconnecting the introduction of the refrigerant to and from.

The accumulator 14 is provided to store the liquid phase component contained in the gas refrigerant flowing into the compressor 11. The receiver 15 is provided for gas-liquid separation of the refrigerant liquefied by the heat exchanger functioning as a condenser, and storing excess refrigerant in the refrigeration cycle as liquid.
The oil separator 16 is provided to separate the oil contained in the refrigerant and return it to the compressor 11.

The throttle mechanism 17 is for decompressing and expanding the condensed high-temperature and high-pressure liquid refrigerant into a low-temperature and low-pressure liquid refrigerant. In the illustrated example, a combination of a thermal expansion valve 17a and a capillary tube 17b is used as the throttle mechanism 17.

The four-way valve 18 is provided in the refrigerant pipe 2 and selectively switches the flow path and flow direction of the refrigerant. The four-way valve 18 is provided with four ports D, C, S and E. The port D is connected to the discharge side of the compressor 11 and the port C.
Are connected to the outdoor heat exchanger 12, the port S is connected to the suction side of the compressor 11, and the port E is connected to the indoor heat exchanger 1a by refrigerant pipes 2, respectively.

On the other hand, in the gas engine section, mainly the gas engine GE, the cooling water system 30 and the fuel intake system 60.
Besides, an exhaust gas system and an engine oil system (not shown) are provided. The gas engine GE is connected to the compressor 11 installed in the refrigerant circuit section by a shaft or a belt, and the driving force is transmitted from the gas engine GE to the compressor 11.

The cooling water system 30 is provided with a water pump 31, a reservoir tank 32, a radiator 33, etc., and cools the gas engine GE with engine cooling water that goes around a circuit (indicated by a broken line) constituted by connecting these components by piping. It is a system for doing. The water pump 31 is provided to circulate the cooling water of the gas engine GE in the circuit. The reservoir tank 32 is for temporarily storing an excess of the cooling water flowing through this circuit, or for supplying the cooling water when the cooling water is insufficient in the circuit. The radiator 33 is configured integrally with the outdoor heat exchanger 12, and is provided to release the heat taken by the engine cooling water from the gas engine GE to the outside air.

The cooling water system 30 is provided with an exhaust gas heat exchanger (exhaust gas heat exchanger) 34 in addition to the above-mentioned structure.
This is for recovering the heat of the exhaust gas discharged from the gas engine GE to the engine cooling water. Further, the cooling water system 30 is provided with the water heat exchanger 13 described above, and is arranged so as to extend over both the refrigerant circuit unit and the cooling water system 30. Therefore, during heating operation, the engine cooling water not only takes heat from the gas engine GE but also recovers heat from the exhaust gas, and the recovered heat passes through the water heat exchanger 13 from the engine cooling water. It is a mechanism that is given to the refrigerant. The cooling water system 3
The flow rate control of the engine cooling water at 0 is performed by the flow rate control valves 35A and 35B provided at two locations.

The fuel intake system 60 includes a gas regulator 6
1, a gas solenoid valve 62, a gas connection port 63, etc., and is a system for supplying city gas such as liquefied natural gas (LNG) to the gas engine GE as gas fuel. The gas regulator 61 is provided for adjusting the delivery pressure of the gas fuel supplied from the outside via the gas solenoid valve 62 and the gas connection port 63. The gas fuel whose pressure is adjusted by the gas regulator 61 is mixed with the air sucked from an intake port (not shown) and then supplied to the combustion chamber of the gas engine GE.

In the following, the operation of the GHP having the above-described structure will be described together with the flow of the refrigerant, engine cooling water and the like during each operation of cooling and heating the room. First, the heating operation will be described with reference to FIG. The open / closed state of each valve is black, the valves are closed, and the flow directions of the refrigerant and the engine cooling water are indicated by arrows. When the heating operation is selected, the four-way valve 18 of the refrigerant circuit section is switched, and the ports D / E and C are connected.
/ S communication, the discharge side of the compressor 11 and the indoor heat exchanger 1
a is connected. Further, the solenoid valves 23 and 24 are both opened, and all the electronic expansion valves 1b are also fully opened.

First, the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is sent to the indoor heat exchanger 1a through the four-way valve 18 and the operation valve 21. The gas refrigerant sent to the indoor heat exchanger 1a exchanges heat with the indoor air to be condensed and liquefied. In this process, the gas refrigerant radiates heat to warm the indoor air, and then becomes a high temperature and high pressure liquid refrigerant. The liquid refrigerant flows through the electronic expansion valve 1b, the operation valve 21 and the receiver 15, and the receiver 15 separates gas and liquid. The liquid refrigerant that has exited the receiver 15 is guided to the refrigerant pipe 2 and branched, and a part of the liquid refrigerant passes through the solenoid valve 23 and the throttle mechanism 17 and the outdoor heat exchanger 1
2 is sent to the water heat exchanger 13 through the electromagnetic valve 24 and the throttle mechanism 17.

The liquid refrigerant sent to the outdoor heat exchanger 12 is decompressed in the process of passing through the throttle mechanism 17 to become a low temperature and low pressure liquid refrigerant. In the outdoor heat exchanger 12, the low-temperature low-pressure liquid refrigerant takes heat from the outside air and evaporates to become a low-temperature low-pressure gas refrigerant. At this time, by flowing high-temperature engine cooling water to the radiator 33, it is possible to efficiently evaporate and vaporize the liquid refrigerant by utilizing the engine waste heat.

The liquid refrigerant sent to the water heat exchanger 13 is decompressed in the process of passing through the throttle mechanism 17 to become a low temperature and low pressure liquid refrigerant. In the water heat exchanger 13, the low-temperature low-pressure liquid refrigerant is heated by the engine cooling water and vaporized to become a low-temperature low-pressure gas refrigerant. In addition, under operating conditions where the outside air temperature is extremely low,
The electromagnetic valve 24 may be closed to operate only the water heat exchanger 13.

The low-temperature low-pressure gas refrigerant having passed through the outdoor heat exchanger 12 is introduced from the port C of the four-way valve 18 to the accumulator 14 via the port S, and the liquid phase component is separated and then sucked into the compressor 11. Further, the low-temperature low-pressure gas refrigerant that has passed through the water heat exchanger 13 does not pass through the four-way valve 18 and the refrigerant pipe 2 a.
Is directly led to the accumulator 14.

The gas refrigerant sucked into the compressor 11 is compressed by the operation of the compressor 11, becomes a high temperature and high pressure gas refrigerant, and is sent to the indoor heat exchanger 1a again. Thereafter, the above process is repeated to realize the refrigeration cycle.

Next, the flow of the refrigerant and the engine cooling water during the cooling operation will be briefly described with reference to FIG.
When the cooling operation is selected, the four-way valve 18 communicates between ports D / C and between E / S, and the discharge side of the compressor 11 and the outdoor heat exchanger 12 are connected. Further, the electromagnetic valves 23 and 24 are both closed, and each electronic expansion valve 1b is adjusted to an appropriate opening degree according to the capacity required for the indoor heat exchanger 1a corresponding thereto.

First, the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is sent to the outdoor heat exchanger 12 through the four-way valve 18. The gas refrigerant sent to the outdoor heat exchanger 12 radiates heat to the outside air to be condensed and liquefied, and becomes a high temperature and high pressure liquid refrigerant. This liquid refrigerant has a check valve 2 because the solenoid valves 23 and 24 are closed.
It passes through 0 and is guided to the receiver 15. The liquid refrigerant separated into gas and liquid by the receiver 15 is guided to the electronic expansion valve 1b through the operation valve 21, and is decompressed in the process of passing through the electronic expansion valve 1b to become a low-temperature low-pressure liquid refrigerant, and the indoor heat exchanger. 1a
Sent to.

The low-temperature low-pressure liquid refrigerant sent to the indoor heat exchanger 1a takes heat from the indoor air to be vaporized. In this process, the room air is cooled to become a low-temperature low-pressure gas refrigerant, which is guided to the four-way valve 18 through the operation valve 21 and the refrigerant pipe 2.
The low-temperature low-pressure gas refrigerant led to the four-way valve 18 is
Through the port S into the accumulator 14, where the liquid phase component is separated and then sucked into the compressor 11. The gas refrigerant sucked into the compressor 11 is compressed by the operation of the compressor 11, becomes a high-temperature high-pressure gas refrigerant, and is sent to the outdoor heat exchanger 12 again. Thereafter, the above process is repeated to realize the refrigeration cycle.

Next, the flow of the refrigerant and the engine cooling water during the defrost operation will be briefly described with reference to FIG. When the defrost operation is selected, the four-way valve 18 is switched to the same as the cooling operation. Further, the electromagnetic valve 23 is closed but the electromagnetic valve 24 is opened, and all the electronic expansion valves 1b are fully closed.

First, the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is sent to the outdoor heat exchanger 12 through the four-way valve 18. The gas refrigerant sent to the outdoor heat exchanger 12 melts the frost adhering to the indoor heat exchanger 12 by radiating heat to the outside air, and condenses itself into a liquid refrigerant of high temperature and high pressure. This liquid refrigerant is applied to the solenoid valve 23 and each electronic expansion valve 1b.
The solenoid valve 24 and throttle mechanism 17 are all closed because
And is sent to the water heat exchanger 13.

The liquid refrigerant sent to the water heat exchanger 13 is decompressed in the process of passing through the throttle mechanism 17 to become a low temperature and low pressure liquid refrigerant. In the water heat exchanger 13, the low-temperature low-pressure liquid refrigerant is heated by the engine cooling water and vaporized to become a low-temperature low-pressure gas refrigerant.

The low-temperature low-pressure gas refrigerant that has passed through the water heat exchanger 13 is directly guided to the accumulator 14 through the refrigerant pipe 2a without passing through the four-way valve 18, and the liquid phase component is separated and then sucked into the compressor 11. .

The gas refrigerant sucked into the compressor 11 is compressed by the operation of the compressor 11, becomes a high temperature and high pressure gas refrigerant, and is sent to the indoor heat exchanger 1a again. Thereafter, the above process is repeated to realize the refrigeration cycle.

In the gas heat pump type air conditioner described above, in the heating operation mode and the defrost operation mode, the refrigerant evaporated and vaporized in the water heat exchanger 13 is transferred to the refrigerant pipe 2
Since it is introduced into the compressor 11 through the a without passing through the four-way valve 18, the pressure loss can be made smaller than in the conventional case. As a result, it is possible to improve the heating capacity and the heating efficiency during the heating operation. During the defrost operation, it is possible to shorten the stop time of the indoor air conditioning due to the defrost removal.

Further, unlike the conventional case, the defrost operation by the gas heat pump type air conditioner has a mechanism in which the cooled refrigerant does not flow into the indoor heat exchanger 1a, so that the indoor heat exchanger 1a is operated during the defrost operation. I don't get cold.
Therefore, when the defrost operation is finished and the heating operation is restarted, there is no useless work for warming the cold indoor heat exchanger 1a. As a result, the heating starts up quickly after the defrost operation is restarted, and the indoor air conditioning feels good.

By the way, in the present embodiment, control is performed to close all the electronic expansion valves 1b of the indoor unit 1 when the defrost operation is started, but as another embodiment, a) the electronic expansion valve 1b is The control is not particularly performed, and the defrost operation is continued by continuing the opening during heating operation that was selected before the defrost operation is started. B) The opening of the electronic expansion valve 1b is set to a predetermined opening, for example, the conventional It is also possible to perform the defrost operation by the expansion valve control similar to the defrost operation.

In the case of the above embodiment a), there is a merit that the control of the defrost operation is simplified, but there is a possibility that cool air may be sent into the room depending on the opening of the electronic expansion valve 1b. In the case of the above embodiment b), the defrost operation can be controlled in the same manner as the conventional defrost operation. In this case, the control can be simplified, but the electronic expansion valve 1b is still open. Some cold air may blow into the room. However, in any of the above embodiments a) and b), since the cooling of the refrigerant is performed by using the engine cooling water, the stop time of the indoor air conditioning due to the frost removal can be shortened as compared with the conventional case. , It is worth noting that the supply of cold air to the room is also very small.

[0050]

The gas heat pump type air conditioner of the present invention has the following effects. (1) By introducing the refrigerant heated in the water heat exchanger into the compressor without passing through the four-way valve, the pressure loss becomes smaller than in the conventional case, so that the heating capacity and the heating efficiency are improved during the heating operation. Can be improved. Also,
During the defrost operation, the stop time of the indoor air conditioning due to the removal of frost is shortened, so that the feeling of the indoor air conditioning is improved.

(2) All or a part of the refrigerant from which frost has been removed from the outdoor heat exchanger by radiating heat to the outdoor heat exchanger is introduced into the water heat exchanger, and the water heat exchanger is introduced. By heating the refrigerant introduced into the engine cooling water by the engine cooling water, the waste heat of the engine cooling water is used to perform the frost removal operation. At that time, since the cold refrigerant does not flow into the indoor heat exchanger, the indoor heat exchanger does not cool, and when the defrost operation is finished and the heating operation is restarted, useless work is required to warm the cold indoor heat exchanger. There is nothing to do. As a result, the heating starts up quickly after the defrost operation is restarted, so that the feeling of indoor air conditioning is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a gas heat pump type air conditioner according to the present invention, showing a heating operation state.

FIG. 2 is a configuration diagram showing a first embodiment of a gas heat pump type air conditioner according to the present invention, showing a state of a cooling operation.

FIG. 3 is a configuration diagram showing a first embodiment of a gas heat pump type air conditioner according to the present invention, showing a defrost operation state.

FIG. 4 is a configuration diagram showing a conventional gas heat pump type air conditioner, showing a heating operation state.

[Explanation of symbols]

1 Indoor unit 1a Indoor heat exchanger 1b Electronic expansion valve (valve mechanism) 2a Refrigerant piping (refrigerant flow path) 10 outdoor unit 11 compressor 12 outdoor heat exchanger 13 Water heat exchanger 18 four-way valve 24 Solenoid valve

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takuya Okada             3-1, Asahi-cho, Nishibiwajima-cho, Nishikasugai-gun, Aichi             Address Mitsubishi Heavy Industries Co., Ltd.

Claims (5)

[Claims] 1. A refrigeration cycle is formed by circulating a refrigerant in a compressor having a gas engine as a drive source, and waste heat discharged from the gas engine is recovered in engine cooling water and the refrigerant is cooled by the engine cooling water. In the gas heat pump type air conditioner configured to heat the heating capacity to heat the refrigerant, the refrigerant heated in the water heat exchanger for exchanging heat between the engine cooling water and the refrigerant, without passing through a four-way valve. A gas heat pump type air conditioner, characterized in that a refrigerant flow path to be introduced into the compressor is provided in the compressor. 2. A refrigeration cycle is formed by circulating a refrigerant in a compressor having a gas engine as a drive source, and waste heat discharged from the gas engine is recovered in engine cooling water and the refrigerant is cooled by the engine cooling water. In a gas heat pump type air conditioner configured to increase the heating capacity by heating the indoor heat exchanger, the introduction of the refrigerant to the indoor heat exchanger is cut off, and the outdoor heat exchanger radiates heat to the outside air to dissipate the outdoor heat exchanger. The defrosted refrigerant is introduced into a water heat exchanger that exchanges heat between the engine cooling water and the refrigerant, and the refrigerant introduced into the water heat exchanger is heated by the engine cooling water. A characteristic gas heat pump type air conditioner. 3. A refrigeration cycle is formed by circulating a refrigerant in a compressor having a gas engine as a drive source, and waste heat discharged from the gas engine is recovered in engine cooling water and the refrigerant is cooled by the engine cooling water. In the gas heat pump type air conditioner configured to heat the indoor heat exchanger to increase the heating capacity, the outdoor heat exchange is performed by limiting the amount of refrigerant introduced into the indoor heat exchanger and radiating the outside air to the outdoor heat exchanger. Part of the refrigerant that has been subjected to defrosting of the vessel is introduced into a water heat exchanger that performs heat exchange between the engine cooling water and the refrigerant, and the refrigerant introduced into the water heat exchanger is changed by the engine cooling water. A gas heat pump type air conditioner characterized by heating. 4. A refrigeration cycle is formed by circulating a refrigerant in a compressor having a gas engine as a drive source, and waste heat discharged from the gas engine is recovered in engine cooling water and the refrigerant is cooled by the engine cooling water. In a gas heat pump type air conditioner configured to increase the heating capacity by heating a part of the refrigerant that has been defrosted in the outdoor heat exchanger by radiating heat to the outside air, A gas heat pump type air conditioner, which is introduced into a water heat exchanger that exchanges heat between engine cooling water and the refrigerant, and the refrigerant introduced into the water heat exchanger is heated by the engine cooling water. 5. The gas heat pump type air conditioner according to any one of claims 1 to 4, further comprising a valve mechanism for preventing a refrigerant from flowing into the water heat exchanger during a cooling operation. Gas heat pump type air conditioner.