JPH10253101A - Air conditioner with external combustion type gas engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable both defrosting of an outdoor heat exchanger and comfort able feeling in an indoor heating to be attained concurrently. SOLUTION: In the case that a defrosting operation is carried out during a heating operation, a four-way valve 51 is changed over to cause a pipe passage 21 and a pipe passage 22 to be connected to each other and also a pipe passage 31 and a pipe passage 32 to be connected to each other and then a four-way valve 53 is changed over to cause a pipe passage 25 and a pipe passage 35 to be connected to each other and also a pipe passage 34 and a pipe passage 26 to be connected to each other. With such an arrangement as above, a closed circuit is constituted by middle temperature heat exchangers 5, 6, an indoor heat exchanger 301, a low temperature heat exchanger 8 and an outdoor heat exchanger 201. It is possible to supply liquid refrigerant having a higher temperature than that a attained during a heating operation to the outdoor heat exchanger 201 and in turn it is also possible to supply liquid refrigerant having a higher temperature than that attained during a cooling operation to the indoor heat exchanger 301.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using an external combustion type hot gas engine suitable as a cooling source for a cooling / heating device or a hot water supply device. The present invention relates to an air conditioner that can be used for air conditioning.

[0002]

2. Description of the Related Art In recent years, as a device for cooling, heating and hot water supply,
Vuilleumier Cycle Heat Pump (Vuilleumier Cycle Heat Pump)
MHP ”). The VMHP causes a pressure change only by a change in the temperature distribution of He (helium) gas as a sealing medium (working gas), thereby enabling direct cooling / heating / hot water supply (for example, Japanese Patent Publication No.
JP-A-65777), which has high thermal efficiency and can contribute to energy saving.

Further, VMHP uses hot and cold water as a medium for heat transfer, and does not use refrigerant refrigerant at all unlike conventional air conditioners. It can be said that this is the next-generation air-conditioning device that is gentle on the environment. The VMHP includes a heat-dissipating heat source and a heat-absorbing heat source in the device, and connects the former heat-dissipating heat source and the indoor heat exchanger with a closed circuit through which hot water circulates, while the latter heat-absorbing heat source and the outdoor heat exchanger. Are connected by a closed circuit through which cold water circulates, thereby performing indoor heating. Then, when performing indoor heating, the above-mentioned two closed circuits are selectively switched by the switching means. That is, contrary to the above, a closed circuit is formed by the heat radiation source and the outdoor heat exchanger, and a closed circuit is formed by the heat absorbing power source and the indoor heat exchanger. Thus VMH
P switches the cooling / heating operation by switching the switching means.

According to the above-mentioned VMHP, a closed circuit is formed independently in each of the heating operation and the cooling operation. For example, when hot water is supplied to one indoor heat exchanger, the other outdoor heat exchanger is used. When cold water is supplied to one indoor heat exchanger, hot water is supplied to the other outdoor heat exchanger.

[0005]

Therefore, there is a first problem during the defrosting operation. That is, as a method of defrosting, conventionally, a method of temporarily setting the cooling operation state during the heating operation to supply hot water to the outdoor heat exchanger for defrosting, or for a predetermined time period during the heating operation, for a short time of cooling. There are known methods of defrosting by driving, but these are temporary,
Since the cold air is sent into the room, there is a problem that the user is not comfortable.

Next, as a second problem, when the medium circuit is filled with a medium (in the above, water), in both cases of cooling and heating, two closed circuits are formed. Must be filled, and the operation becomes complicated.

Accordingly, a first object of the present invention is to enable good defrosting operation, and a second object is to provide an external combustion system which can simplify the operation for filling a medium in a medium circuit. An object of the present invention is to provide an air conditioner using a gas engine.

[0008]

The invention according to claim 1 is
A heat radiating heat source and a heat absorbing heat source of the external combustion type hot gas engine are connected to an indoor heat exchanger and an outdoor heat exchanger via a medium circuit, and the medium circuit is provided with a medium flow path switching valve. In an air conditioner using an external-combustion-type hot gas engine that enables cooling and heating operation by switching a flow path switching valve, a heat radiation source, an outdoor heat exchanger, and heat absorption during defrosting operation by switching the medium flow switching valve. A closed circuit for circulating the medium in the order of the heat source for use and the indoor heat exchanger is provided.

According to the first aspect of the invention, during the defrosting operation, the temperature of the outdoor heat exchanger is higher than that of the cold water during the heating operation (however, lower than the temperature of the hot water during the cooling operation).
Cold water can be supplied to the outdoor heat exchanger, and hot water having a lower temperature than the hot water during the heating operation (but higher than the cold water during the cooling operation) can be supplied to the outdoor heat exchanger. Defrosting and heating can be appropriately compatible.
Here, “appropriate” means that the defrosting ability is reduced as compared with the conventional case, but that heating is not sacrificed accordingly.

According to a second aspect of the present invention, a heat radiating heat source and a heat absorbing heat source of an external combustion type heat gas engine are connected to an indoor heat exchanger and an outdoor heat exchanger via a medium circuit, and the medium circuit is connected to the heat circuit. Is provided with a medium flow path switching valve, and in an air conditioner using an external combustion type hot gas engine in which cooling and heating operation is enabled by switching the medium flow path switching valve, the medium charging operation is performed by switching the medium flow path switching valve. Sometimes, a closed circuit that circulates the medium in the order of a heat radiation source, an indoor heat exchanger, a heat absorption source, and an outdoor heat exchanger is provided, and a medium filling tank is connected to the closed circuit. .

According to the second aspect of the present invention, by switching the medium flow path switching valve, what has conventionally been two closed circuits can be configured as one closed circuit. Filling the medium into the medium becomes easy.

The invention according to claim 3 is the invention according to claim 1 or 2
Wherein the medium flow switching valve comprises two four-way valves. According to this, the configuration is simple and the control is also simplified.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
It will be described in detail based on.

FIGS. 1, 2 and 3 are circuit diagrams of an air conditioner (hereinafter simply referred to as "air conditioner") 100 using an external combustion type hot gas engine according to the present invention. These figures show circuit diagrams during the heating operation, the cooling operation, and the defrosting operation in the order of FIG. 1, FIG. 2, and FIG. FIG. 4 is a partially cutaway perspective view showing a configuration of an external combustion gas engine used in the above-described air conditioner.

The air conditioner 100 shown in FIG. 1 is roughly divided into three units, ie, an outdoor unit 200, an indoor unit 300, and a pump unit 400, as indicated by broken lines in FIG. Outdoor unit 2
As shown in FIG. 1 and FIG. 4, 00 has a Vilmier cycle hot gas engine 1 as a power source. The hot gas engine 1 includes a high-temperature-side piston 2 and a low-temperature-side piston 3 arranged orthogonally to each other, and these are housed in a container in which a working gas such as helium is sealed. The inside of the container is divided into a high-temperature chamber 12, medium-temperature chambers 13 and 14, and a low-temperature chamber 15. A heater 16 is provided at an end of the high-temperature chamber 12, and the heater 16 is provided so as to face the heater 16.
Is provided with a combustor 11 for heating.

The high temperature side piston 2 and the low temperature side piston 3 are connected to each other, for example, when the former high temperature side piston 2 reaches an intermediate position between the top dead center and the bottom dead center. They are connected by the crank 10 so as to operate in a state where they are 90 ° out of phase with each other, such as being located at a dead center. The crank 10 is driven to rotate by a motor 9. When the high-temperature-side piston 2 and the low-temperature-side piston 3 operate, the sealed working gas passes through the high-temperature regenerator 4 between the high-temperature chamber 12 and the medium-temperature chamber 13 on the high-temperature side, and on the low-temperature side. Is configured to move between the medium temperature chamber 14 and the low temperature chamber 15 through the low temperature regenerator 7. The working gas is supplied to the high-temperature regenerator 4
In addition, when passing through the low-temperature regenerator 7, heating or cooling is performed, whereby the pressure in the closed container is increased or reduced.

For example, when the working gas in the high-temperature chamber 12 moves to the medium-temperature chamber 13 through the high-temperature regenerator 4, the heat energy of the working gas is stored in the high-temperature regenerator 4, and the pressure of the working gas decreases. . Conversely, the working gas flows from the medium temperature chamber 13 to the high temperature chamber 1
At the time of recirculation, the thermal energy stored in the high-temperature regenerator 4 is released to the working gas, and the pressure of the working gas rises. When the working gas in the low-temperature chamber 15 moves to the medium-temperature chamber 14 through the low-temperature regenerator 7, heat energy is supplied to the low-temperature regenerator 7, and the pressure of the working gas also increases. Conversely, when the working gas recirculates from the medium temperature chamber 14 to the low temperature chamber 15, the heat energy of the working gas is absorbed by the low temperature regenerator 7 and the pressure of the working gas decreases.

The exchange of heat energy with the outside is as follows:
The intermediate temperature heat exchangers 5 and 6 connected to the intermediate temperature chambers 13 and 14 and the low temperature heat exchanger 8 connected to the low temperature chamber 15 perform the operation. For example, when the heater 16 gives thermal energy to the working gas in the high temperature chamber 12, the working gas in the medium temperature chambers 13, 14 becomes
Heat energy is released to the external heat medium through the low-temperature heat exchanger 6 and the working gas on the low-temperature chamber 15 side absorbs heat energy from the external heat medium through the low-temperature heat exchanger 8.

That is, in the hot gas engine 1 of the present embodiment, the low-temperature heat exchanger 8 and the low-temperature chamber 15 constitute a heat source for absorbing heat, while the medium-temperature heat exchangers 5 and 6 and the medium-temperature chambers 13 and 14 Constitutes a heat source for heat radiation, and an air conditioner 10 using the low-temperature heat exchanger 8 and the medium-temperature heat exchangers 5 and 6 of the hot gas engine 1.
0 is provided.

The outdoor unit 200 includes an outdoor unit 203 having an outdoor heat exchanger 201 and an outdoor fan 202 in addition to the above-described hot gas engine 1.
An indoor unit 303 having an indoor heat exchanger 301 and an outdoor fan 302 is provided.

The pump unit 400 includes a liquid refrigerant (medium,
In the present embodiment, a storage tank 401 storing “water”) and a pump (not shown) are provided.

Next, the hot gas engine 1 and the outdoor unit 203 are
Further, a description will be given of a pipeline for thermally connecting the hot gas engine 1 and the indoor unit 303 and a switching unit for switching the flow channel.

During the heating operation shown in FIG.
Are connected to the indoor unit 303, and the low-temperature heat exchanger 8 of the hot gas engine 1 is connected to the outdoor unit 203. The medium temperature heat exchanger 5 during the heating operation includes a pipe 21 as a forward path of the high-temperature liquid refrigerant, a four-way valve (medium supply switching means (medium flow switching valve)) 51, a pipe 22, and a storage tank 40.
1, the pipe 23, the check valve 52, and the pipe 24 are connected to the indoor heat exchanger 301. The indoor heat exchanger 301 is connected to the pipe 25 as a return path of the high-temperature liquid refrigerant, and a four-way valve (medium recovery). The switching means (medium flow path switching valve) 53 is connected to the intermediate temperature heat exchanger 6 via a pipe line 26. That is, the medium-temperature heat exchanger 5, the outward path of the high-temperature liquid refrigerant, the indoor heat exchanger 301, the return path of the high-temperature liquid refrigerant, and the medium-temperature heat exchanger 6 constitute a closed circuit in which the high-temperature liquid refrigerant circulates. Note that an air vent pipe 37 is provided between the pipeline 34 and the storage tank 401 in FIG.

The low-temperature heat exchanger 8 during the heating operation is also used.
Is a pipeline 31, a four-way valve 51 as an outgoing path of the low-temperature liquid refrigerant,
The outdoor heat exchanger 201 is connected via a pipe 32, a check valve 54, and a pipe 33 to the outdoor heat exchanger 201. The outdoor heat exchanger 201 has a pipe 34, a four-way valve 53, and a pipe 35 as a return path of the low-temperature liquid refrigerant. Is connected to the low-temperature heat exchanger 8. That is, the low-temperature heat exchanger 8 and the outward path of the low-temperature liquid refrigerant and the outdoor heat exchanger 201
And the return path of the high-temperature liquid refrigerant form a closed circuit in which the low-temperature liquid refrigerant circulates.

Next, during the cooling operation shown in FIG. 2, the four-way valves 51 and 53 are switched as shown in FIG. 2, that is, the pipe 21 is connected to the pipe 32 and the pipe 31 is connected to the pipe 22.
And the intermediate temperature heat exchangers 5 and 6 of the hot gas engine 1 and the outdoor unit 303 which connect the pipe 25 to the pipe 35 and connect the pipe 34 to the pipe 26, and The low-temperature heat exchanger 8 of the hot gas engine 1 and the indoor unit 203 are connected.

During the cooling operation, the intermediate-temperature heat exchanger 5 is connected to the outdoor heat exchanger 201 via the pipe 21, the four-way valve 51, the pipe 32, the check valve 54, and the pipe 33 as the outward path of the high-temperature liquid refrigerant. , And the outdoor heat exchanger 201 is connected to the intermediate-temperature heat exchanger 6 via a pipe 34, a four-way valve 53, and a pipe 26 as a return path of the high-temperature liquid refrigerant. That is, the medium temperature heat exchanger 5
, The outward path of the high-temperature liquid refrigerant, the outdoor heat exchanger 201, the return path of the high-temperature liquid refrigerant, and the medium-temperature heat exchanger 6 constitute a closed circuit in which the high-temperature liquid refrigerant circulates.

In the cooling operation, the low-temperature heat exchanger 8 is connected to the pipe 31, the four-way valve 51, the pipe 22, the storage tank 401, the pipe 23, the check valve 52, and the pipe 24 as the outward path of the low-temperature liquid refrigerant. Is connected to the indoor heat exchanger 301 via the
01 is a conduit 25 as a return path of the low-temperature liquid refrigerant, a four-way valve 5
3. It is connected to the low-temperature heat exchanger 8 via the pipe line 35. That is, the low-temperature heat exchanger 8 and the outward path of the low-temperature liquid refrigerant, the indoor heat exchanger 301 and the return path of the low-temperature liquid refrigerant constitute a closed circuit in which the low-temperature liquid refrigerant circulates.

Next, during the defrosting operation shown in FIG. 3, which is a feature of this embodiment, the four-way valves 51 and 53 are switched as shown in the figure. That is, the pipe 21 is connected to the pipe 22, the pipe 31 is connected to the pipe 32, the pipe 25 is connected to the pipe 35, and the pipe 34 is connected to the pipe 26. Thereby, the medium temperature heat exchanger 5, the indoor unit 303, the low temperature heat exchanger 8, the outdoor unit 203, and the medium temperature heat exchanger 6 of the hot gas engine 1 constitute one closed circuit as a whole.

That is, at the time of the defrosting operation,
Form one closed circuit. Starting from the medium temperature heat exchanger 5, the pipe 21, the four-way valve 51, the pipe 22, the storage tank 401, the pipe 23, the check valve 52, the pipe 24, the indoor heat exchanger 301,
Pipe 25, used valve 53, pipe 35, low-temperature heat exchanger 8, pipe 31, four-way valve 51, pipe 32, check valve 54, pipe 3
3. A closed circuit that returns to the intermediate-temperature heat exchanger 5 via the outdoor heat exchanger 201, the pipeline 34, the four-way valve 53, the pipeline 26, the intermediate-temperature heat exchanger 6, and the pipeline 36.

Next, the operations during the heating operation, the cooling operation, and the defrosting operation will be described.

During the heating operation, the hot gas engine 1 is operated by the ignition of the combustor 11, and the heat energy of the working gas is absorbed by the liquid refrigerant via the medium-temperature heat exchangers 5 and 6, while the low-temperature heat exchanger is The heat energy of the liquid refrigerant is released to the working gas via 8, and at this time, the four-way valves 51 and 53 are switched to the positions shown in FIG. In this case, the medium temperature heat exchangers 5, 6
The liquid refrigerant that has absorbed the heat energy in
1, pipeline 22, storage tank 401, pipeline 23, check valve 5
2. It flows to the indoor heat exchanger 301 via the pipe 24.
In the indoor unit 303, air is blown from the indoor fan 302 to the indoor heat exchanger 301, which has become relatively high temperature, and hot air is sent out (heating is performed) into the room, while heat energy is released into the room. The liquid refrigerant that has flowed through the pipe 25, the four-way valve 53,
It recirculates to the intermediate temperature heat exchangers 5 and 6 via the pipe 26.

The liquid refrigerant that has released the heat energy in the low-temperature heat exchanger 8 is supplied to the pipe 31, the four-way valve 51, the pipe 32, the check valve 5
4. After flowing through the pipe 33 to the outdoor heat exchanger 201, where the heat from the outdoor fan 202 is absorbed by blowing air from the outdoor fan 202, the low-temperature heat is passed through the pipe 34, the four-way valve 53, and the pipe 35. Reflux to the exchanger 8.

During the cooling operation, the hot gas engine 1 is operated by the ignition of the combustor 11, and the heat energy of the working gas is released to the liquid refrigerant via the medium temperature heat exchangers 5 and 6, while the low temperature heat exchanger is The heat energy of the liquid refrigerant is absorbed by the working gas through 8. At this time, the four-way valves 51 and 53 are switched to the positions shown in FIG. 2, and the liquid refrigerant that has released heat energy in the low-temperature heat exchanger 8 is connected to the pipe 31, the four-way valve 51, the pipe 22,
It flows to the indoor heat exchanger 301 via the storage tank 401, the pipe 23, the check valve 52, and the pipe 24. In the indoor unit 303, the indoor fan 3 is
Blowing from 02 is performed, cool air is blown into the room (cooling is performed), and the liquid refrigerant that has absorbed the heat energy of the room air passes through the pipe 25, the four-way valve 53, and the pipe 35 to perform low-temperature heat exchange. Reflux to vessel 8. At this time, the liquid refrigerant having absorbed the heat energy in the intermediate temperature heat exchanger 5 is supplied to the pipe 21, the four-way valve 51, the pipe 3
2. After passing through the check valve 54 and the pipe 33, the outdoor heat exchanger 20
1, where it is cooled by the air blown from the outdoor fan 202, and then flows through the pipe 34, the four-way valve 53, and the pipe 26 to the intermediate-temperature heat exchanger 6, and further returns to the intermediate-temperature heat exchanger 5 through the pipe 36. .

At the time of the defrosting operation, the hot gas engine 1 is operated by the ignition of the combustor 11, and the heat energy of the working gas is absorbed by the liquid refrigerant through the medium temperature heat exchangers 5 and 6, while the low temperature heat exchange is performed. The heat energy of the liquid refrigerant is released to the working gas via the vessel 8, and at this time, the four-way valves 51 and 53 are switched to the positions shown in FIG. In this case, the medium temperature heat exchangers 5, 6
The liquid refrigerant that has absorbed the heat energy in
1, pipeline 22, storage tank 401, pipeline 23, check valve 5
2. It flows to the indoor heat exchanger 301 via the pipe 24.
In the indoor unit 303, air is blown from the indoor fan 302 to the indoor heat exchanger 301, which has become relatively high temperature, and hot air is sent out (heating is performed) into the room, while heat energy is released into the room. The liquid refrigerant that has flowed through the pipe 25, the four-way valve 53,
It is sent to the low-temperature heat exchanger 8 via the pipe 35.

At this time, the liquid refrigerant that has released heat energy in the low-temperature heat exchanger 8 is supplied to the pipe 31, the four-way valve 51, the pipe 32,
After flowing through the check valve 54 and the pipe 33 to the outdoor heat exchanger 201, where the heat energy of the outside air is absorbed by blowing air from the outdoor fan 202, the pipe 34, the four-way valve 53, and the pipe 2
The heat is returned to the intermediate temperature heat exchanger 6 via the heat exchanger 6.

That is, during the heating operation, the outdoor heat exchanger 20
The liquid refrigerant supplied to 1 is a liquid refrigerant circulating between the outdoor heat exchanger 201 and the low-temperature heat exchanger 8,
The liquid refrigerant supplied to the outdoor heat exchanger 201 during the defrosting operation is a liquid refrigerant that circulates between the outdoor heat exchanger 201, the medium-temperature heat exchangers 6, 5, the indoor heat exchanger 301, and the low-temperature heat exchanger 8. Therefore, the liquid refrigerant supplied to the outdoor heat exchanger 201 is:
At least, the temperature is higher during the defrosting operation than during the heating operation. Therefore, an appropriate defrosting ability can be exhibited. However, the temperature of the liquid refrigerant supplied to the indoor heat exchanger 301 is lower during the defrosting operation than during the heating operation.

However, even in this case, the temperature of the liquid refrigerant supplied to the indoor heat exchanger 301 is lower than that in the conventional case where the operation is temporarily switched to the cooling operation for defrosting during heating. Higher during defrosting operation than during operation. That is, since the conventional defrosting operation was the same as the cooling operation, the cool air was blown into the room at the time of heating, but by performing the defrosting operation as in the present embodiment, the air was blown into the room at the time of the defrosting operation. Although the generated wind is lower in temperature than the warm air during the heating operation, it can be warmed to a practically unsupported degree. In addition, as described above, the defrosting can be performed well.

As described above, the first embodiment (first invention)
According to this, it has become possible to achieve both the defrosting of the outdoor heat exchanger 201 and the comfort of indoor heating, which have been conventionally contradictory, to such an extent that there is no practical problem. Moreover, in order to realize this, it is not necessary to add a special conduit or the like, and the operation can be performed by a simple operation of simply switching the conventionally mounted four-way valves 51 and 53 to the positions shown in FIG.

(Embodiment 2) In the above-described Embodiment 1 (first invention), the four-way valves 51 and 53 are used for the purpose of defrosting.
3 is switched to the position shown in FIG. 3. In the second embodiment (second invention), the above-described four-way valve is used for the purpose of filling each heat exchanger and the pipeline with the liquid refrigerant, that is, for performing the so-called water filling operation. 5
1 and 53 are switched to the positions shown in FIG. 3 (the same positions as in the defrosting operation). At the time of starting the air-conditioning apparatus 100, the liquid refrigerant is supplied to each heat exchanger (medium-temperature heat exchangers 5, 6, low-temperature heat exchanger 8, outdoor heat exchanger 201, and indoor heat exchanger 301) and each of the pipes 21 to 36. It is necessary to fill.
Storage tank (medium filling tank) 401 by pump
The filling operation is performed by flowing the liquid refrigerant inside.

Conventionally, in both cases of the heating operation and the cooling operation, as described in the first embodiment, two closed circuits are formed by the predetermined heat exchangers and the predetermined pipelines. Therefore, in the filling operation, first, the four-way valves 51 and 53 are set for the heating operation shown in FIG.
The indoor heat exchanger 301, the pipes 21 to 26, and the pipe 36 are filled with the liquid refrigerant, and then the four-way valves 51 and 53 are set for the cooling operation shown in FIG. Fill the remaining heat exchangers and pipelines that cannot be filled with liquid refrigerant. For this reason, the filling operation was complicated.

Then, the four-way valves 51 and 53 are switched to the positions for the defrosting operation shown in FIG. According to this, since all the heat exchangers and the pipeline constitute one closed circuit, only one filling operation is required, and workability is improved.

As described above, the first embodiment is described as an example of the first invention, and the second embodiment is described as an example of the second invention.
However, the present invention is not limited to these. For example, in the first and second embodiments, the four-way valve 51 and the four-way valve 53 are used as the medium supply switching means and the medium recovery switching means, respectively. However, for example, an electromagnetic valve may be used instead. it can. In other words, any other means can be used as the medium supply switching means and the medium recovery switching means, provided that the pipeline can be effectively switched as described above.

[0043]

According to the first aspect of the present invention, when performing the defrosting operation during the heating operation, the medium supply switching means and the medium recovery switching means are switched, so that the heat radiating heat source, the indoor heat exchanger, the heat absorbing By forming a closed circuit with the heat source for use and the outdoor heat exchanger, the outdoor heat exchanger can be supplied with a liquid refrigerant having a higher temperature than during the heating operation, while the indoor heat exchanger can be supplied during the cooling operation. Since a liquid refrigerant having a higher temperature can be supplied, it is possible to achieve both defrosting of the outdoor heat exchanger and comfort of indoor heating.

According to the second aspect of the present invention, the medium supply switching means and the medium recovery switching means are set to the positions during the defrosting operation, and the medium is filled with the medium. In contrast to the necessity of the filling operation for the closed circuit, etc., only the filling operation for one closed circuit is required, and the filling operation can be simplified.

According to the third aspect of the invention, since the four-way valve is used, simplification of piping and simplification of control can be achieved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of an air conditioner using an external combustion type hot gas engine during a heating operation.

FIG. 2 is a circuit diagram showing a configuration of the air-conditioning apparatus using the external combustion type hot gas engine during a cooling operation.

FIG. 3 is a circuit diagram showing a configuration of an air conditioner using an external combustion type hot gas engine during a defrosting operation.

FIG. 4 is a partially cutaway perspective view showing the structure of an external combustion type hot gas engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 External combustion type heat gas engine 5, 6 Heat radiation source (medium temperature heat exchanger) 8 Heat absorption source (low temperature heat exchanger) 51 Medium flow path switching valve (four-way valve) 53 Medium flow path switching valve (four-way valve) 201 Outdoor heat exchanger 301 Indoor heat exchanger 401 Medium filling tank

Claims (3)

[Claims] 1. A heat-radiating heat source and a heat-absorbing heat source of an external combustion type heat gas engine are connected to an indoor heat exchanger and an outdoor heat exchanger via a medium circuit, and the medium circuit has a medium flow path switching valve. Is established,
In an air conditioner using an external combustion type heat gas engine that enables a cooling and heating operation by switching the medium flow path switching valve, a heat radiation source and an outdoor heat exchanger during defrosting operation by switching the medium flow switching valve An air conditioner comprising a closed circuit that circulates a medium in the order of a heat absorbing heat source and an indoor heat exchanger. 2. A heat-dissipating heat source and a heat-absorbing heat source of an external combustion type hot gas engine are connected to an indoor heat exchanger and an outdoor heat exchanger via a medium circuit, and the medium circuit has a medium flow path switching valve. Is established,
In an air conditioner using an external combustion type hot gas engine which enables cooling and heating operation by switching the medium flow switching valve, a heat radiation heat source and an indoor heat exchanger during a medium filling operation by switching the medium flow switching valve An air conditioner comprising a closed circuit for circulating a medium in the order of a heat absorbing heat source and an outdoor heat exchanger, and a medium filling tank is connected to the closed circuit. 3. The air conditioner according to claim 1, wherein the medium flow path switching valve includes two four-way valves.