JPH06273008A - Air conditioning apparatus - Google Patents

Abstract

PURPOSE:To prevent frosting and freezing by arranging a refrigerating cycle, an engine which has a heat exchanger for recovering waste heat to drive a compressor and an outdoor side heat exchanger of the refrigerating cycle in proximity to the heat exchanger for recovering waste heat to heat the outdoor side heat exchanger by waste heat recovered. CONSTITUTION:An outdoor side heat exchanger 14 is linked to a compressor 1, a four-way changeover valve 2. a room side heat exchanger 3 and a decompressor 4 sequentially with a refrigerant piping 6 to form a refrigerating cycle 17. A heat exchanger 15 for recovering waste heat of an engine 8 is arranged in contact with the outdoor side heat exchanger 14. A blower 16 for blowing air to both the heat exchangers 14 and 15 forms a flow of air in the direction of the outdoor side heat exchanger 14 from the heat exchanger 15 for recovering waste heat. Thus, the waste heat of the engine 8 recovered with the heat exchanger 15 for recovering the waste heat heats the outdoor side heat exchanger 14 efficiently to prevent the generation of frosting and freezing thereby eliminating the lowering of heating performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner in which a compressor is driven by an engine having a heat exchanger for recovering exhaust heat.

[0002]

2. Description of the Related Art FIG. 4 is a circuit diagram showing the structure of a conventional air conditioner of this type. In the figure, 1 is a compressor, 2 is a four-way switching valve, 3 is an indoor heat exchanger, 4 is a pressure reducing device, 5 is an outdoor heat exchanger, and these 1 to 5 are sequentially connected by a refrigerant pipe 6. The refrigeration cycle 7 is configured. 8
Is an engine for driving the compressor 1, and has an exhaust heat recovery heat exchanger 10 for cooling the cooling water that has recovered the exhaust heat circulated by the pump 9. 11, 12, 1
A blower 3 blows air to the indoor heat exchanger 3, the outdoor heat exchanger 5, and the exhaust heat recovery heat exchanger 10, respectively.

In the conventional air conditioner configured as described above, the high temperature discharged from the compressor 1 driven by the engine 8 during the heating operation (the flow of the refrigerant is indicated by a solid line arrow in the figure). The high-pressure gas refrigerant enters the indoor heat exchanger 3 through the four-way switching valve 2 switched to the heating side, exchanges heat with the indoor air blown by the blower 11, and heats the indoor air. The gas refrigerant is condensed and liquefied. Then, this liquid refrigerant is decompressed by the decompression device 4 to become a low temperature and low pressure liquid refrigerant. After that, the liquid refrigerant enters the outdoor heat exchanger 5, exchanges heat with the outside air blown by the blower 12, evaporates and becomes gas refrigerant again, and returns to the compressor 1 via the four-way switching valve 2.

Further, during the cooling operation (the flow of the refrigerant is indicated by the broken line arrow in the figure), the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is switched to the cooling side by the four-way switching valve 2.
Through which it enters the outdoor heat exchanger 5, exchanges heat with the outside air blown by the blower 12, condenses into liquefaction, and is decompressed by the decompression device 4 to become a low-temperature low-pressure liquid refrigerant. After that, the liquid refrigerant enters the indoor heat exchanger 3 and exchanges heat with the indoor air blown by the blower 11 to cool the indoor air, whereby the liquid refrigerant is vaporized and gasified, and four-way switching is performed as a gas refrigerant. Return to compressor 1 via valve 2.

On the other hand, the cooling water which cools the engine 8 for driving the compressor 1 and is taken out of the engine 8 by the pump 9 enters the exhaust heat recovery heat exchanger 10 and is blown by the blower 13. It is cooled by exchanging heat with the outside air, and then returns to the inside of the engine 8 to cool the inside.

[0006]

Since the conventional air conditioner is constructed as described above, frost is formed on and adheres to the outdoor heat exchanger 5 during heating, especially when the outside air temperature is extremely low. There has been a problem that freezing of water occurs and the effective area of the heat exchanger is narrowed, resulting in deterioration of heating performance.

The present invention has been made to solve the above-mentioned problems, and suppresses the formation of frost and frost on the outdoor heat exchanger even when the outside air temperature becomes very low, thereby heating the room. It is an object of the present invention to provide an air conditioner capable of preventing performance deterioration.

[0008]

According to a first aspect of the present invention, in an air conditioner, a compressor, a four-way switching valve, an indoor heat exchanger, a pressure reducing device and an outdoor heat exchanger are sequentially connected by a refrigerant pipe. And an engine having a heat exchanger for recovering exhaust heat and driving a compressor, the outdoor heat exchanger for the refrigerating cycle and the heat exchanger for recovering exhaust heat for the engine are arranged close to each other. It is a thing.

The air conditioner according to a second aspect of the present invention is the air conditioner according to the first aspect, in which at least a part of the exhaust heat recovery heat exchanger of the engine is arranged below the outdoor heat exchanger of the refrigeration cycle.

[0010]

The heat exchanger for recovering exhaust heat of the air conditioner according to the present invention heats the outdoor heat exchanger with the recovered exhaust heat to prevent frost and frost formation on the outdoor heat exchanger when the outside air temperature decreases. To prevent.

[0011]

【Example】

Example 1. Embodiments of the present invention will be described below with reference to the drawings. 1 is a circuit diagram showing a configuration of an air conditioner according to Embodiment 1 of the present invention, and FIG. 2 is a sectional view showing details of an outdoor heat exchanger of the air conditioner in FIG. In the figure, the same parts as those of the conventional device shown in FIG. An outdoor heat exchanger 14 includes a compressor 1, a four-way switching valve 2, an indoor heat exchanger 3, and a pressure reducing device 4.
At the same time, the refrigeration cycle 1 is sequentially connected by the refrigerant pipe 6.
Make up 7. Reference numeral 15 denotes an exhaust heat recovery heat exchanger of the engine 8, which is arranged in contact with the outdoor heat exchanger 14 as shown in FIG. 16 is both heat exchangers 14 and 15
The blower blows air in the direction from the exhaust heat recovery heat exchanger 15 to the outdoor heat exchanger 14.

In the air conditioner of the first embodiment configured as described above, during heating operation, the high-temperature high-pressure gas refrigerant discharged from the compressor 1 driven by the engine 8 is the heating side as in the conventional apparatus. To the indoor heat exchanger 3 through the four-way switching valve 2 switched to
The heat exchange with the indoor air blown by 1 heats the indoor air, and thereby the gas refrigerant is condensed and liquefied. Then, this liquid refrigerant is decompressed by the decompression device 4 to become a low temperature and low pressure liquid refrigerant. After that, the liquid refrigerant enters the outdoor heat exchanger 14, exchanges heat with the outside air blown by the blower 16, evaporates and becomes gas refrigerant again, and returns to the compressor 1 via the four-way switching valve 2. The description of the operation during the cooling operation is omitted.

When the temperature of the outside air becomes extremely low during the heating operation as described above, frost may form in the outdoor heat exchanger 14 and frost may form on the attached water. The outdoor heat exchanger 14 and the exhaust heat recovery heat exchanger 15 of the engine 8 are arranged in contact with each other, and are blown by the blower 16 from the exhaust heat recovery heat exchanger 15 side to the outdoor heat exchanger 14 side. Therefore, the heat exchanger for exhaust heat recovery 1
Since the exhaust heat of the engine 8 recovered by 5 efficiently heats the outdoor heat exchanger 14, the formation of frost and frost is prevented, and the effective area of the outdoor heat exchanger 14 is narrowed. In addition, the heating performance is not deteriorated.

Example 2. In the first embodiment, as shown in FIG. 2, the outdoor heat exchanger 14 and the exhaust heat recovery heat exchanger 1 are used.
5 and 5 are simply arranged back to back in contact with each other, but as shown in FIG. 3, a part 15a of the exhaust heat recovery heat exchanger 15 is arranged below the outdoor heat exchanger 14. However, in this case, the same effect as that of the first embodiment can be obtained, and the outdoor heat exchanger 1 can be obtained.
Even in the inside of 4, the lower part, where the degree of adhesion of water is relatively large, is intensively heated, so that the effect is further increased.

Example 3. Further, in each of the first and second embodiments,
The case where the outdoor heat exchanger 14 and the exhaust heat recovery heat exchanger 15 are separately configured has been described.
It is needless to say that the same effects as those of the above-described first and second embodiments can be obtained even if the fourth and fifteen are integrated.

Example 4. Furthermore, each of the above Examples 1 to 3
In the above, the case where the outdoor heat exchanger 14 and the exhaust heat recovery heat exchanger 15 are arranged in contact with each other has been described, but it is not always necessary to contact them and the exhaust heat recovered by the exhaust heat recovery heat exchanger 15 is not necessarily required. Even if the heat is brought close to the outdoor heat exchanger 14 within a range in which the heat can be transferred, the same effects as those in the first to third embodiments can be obtained.

Embodiment 5. Further, in each of the above-mentioned Examples 1 to 4,
Although not specifically described as the engine 8, when a Stirling engine which is said to radiate about 50% of the heat input into the cooling water is applied, it exerts an excellent effect in terms of effective utilization of exhaust heat.

[0018]

As described above, according to claim 1 of the present invention, a refrigeration system in which a compressor, a four-way switching valve, an indoor heat exchanger, a pressure reducing device, and an outdoor heat exchanger are sequentially connected by a refrigerant pipe. A cycle and an engine having a heat exchanger for recovering exhaust heat and driving a compressor are provided, and an outdoor heat exchanger for a refrigeration cycle and a heat exchanger for recovering exhaust heat of the engine are arranged in proximity to each other,

According to the second aspect, at least a part of the exhaust heat recovery heat exchanger of the engine is arranged below the outdoor heat exchanger of the refrigeration cycle in the first aspect, so that the outside air temperature is very low. Even so, it is possible to provide an air conditioner capable of suppressing the formation of frost and frost on the outdoor heat exchanger and preventing a decrease in heating performance.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing details of an outdoor heat exchanger of the air-conditioning apparatus in FIG.

FIG. 3 is a cross-sectional view showing details of an outdoor heat exchanger of an air conditioner according to a second embodiment of the present invention.

FIG. 4 is a circuit diagram showing a configuration of a conventional air conditioner.

[Explanation of symbols]

 1 Compressor 2 Four-way switching valve 3 Indoor heat exchanger 4 Pressure reducing device 6 Refrigerant piping 8 Engine 9 Pump 11, 16 Blower 14 Outdoor heat exchanger 15 Exhaust heat recovery heat exchanger 17 Refrigeration cycle

Claims (2)

[Claims] 1. A compressor, a four-way switching valve, an indoor heat exchanger,
An air conditioner comprising a refrigeration cycle in which a decompression device and an outdoor heat exchanger are sequentially connected by a refrigerant pipe, and an engine having a heat recovery heat exchanger and driving the compressor, the refrigeration cycle The air conditioner, wherein the outdoor heat exchanger and the heat recovery heat exchanger of the engine are arranged in proximity to each other. 2. The air conditioner according to claim 1, wherein at least a part of the exhaust heat recovery heat exchanger of the engine is arranged below the outdoor heat exchanger of the refrigeration cycle.