JPH0297851A - Air cooler - Google Patents

Abstract

PURPOSE: To make compact an air cooler while enhancing the performance of a heat exchanger by an arrangement comprising a heat pump in which a heat exchanger has one end part serving as an evaporating section for receiving heat from the radiating part of piping and the other end serving a condensing section for discharging heat to the outside. CONSTITUTION: A heat exchanger 33 comprises a heat pipe 40 encapsulating a condensable working fluid and a piping 39 for passing compressed air is wound around the outer circumference of an evaporating section 40a while touching directly at the section of radiating part 39a. The condensing section 40b of the heat pipe 40 is disposed oppositely to a channel for cooling air being taken in externally by a fan 41 and having temperature lowered by water sprayed from a spray 38a. Steam generated at the evaporating section 40a of the heat pipe 40 transports the compressed and temperature raised air to the condensing section 40b where evaporation latent heat is dissipated thus conducting heat exchange efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a Preyton cycle air cooler using air as a refrigerant.

Conventional technology The ultraviolet rays of the sun's rays irradiated on the earth are said to be harmful to the human body, causing skin cancer if exposed to too much, but the ozone layer that surrounds the earth has a barrier function against ultraviolet rays. This makes it possible for many living things, including humans, to survive. However, in recent years, the destruction of the ozone layer has become a problem, and fluorocarbon gas released into the atmosphere has been cited as one of the main causes.

This fluorocarbon gas has been used not only as a variety of aerosol solvents, but also as a refrigerant for refrigerators. Therefore, in order to prevent the ozone layer from being destroyed by fluorocarbon gases, a movement to regulate the production and use of fluorocarbon gases is being promoted on a global scale.

Therefore, there has been a desire for a refrigeration/cooling system for use in freezers, refrigerators, or air conditioners that can replace conventional refrigerators that use fluorocarbon gas. Therefore, the Preyton cycle air cooler, which uses air as a refrigerant for cooling, has been reconsidered.

As shown in FIG. 3, the conventional 7 Layton cycle air cooler has a heat exchanger 12 installed downstream of the compressor 11 to radiate heat and lower the temperature of the air that has risen due to compression.
This is a system that cools air by adiabatically expanding it with an expansion valve 13. Then, when the expansion valve 13 adiabatically expands and cools the air, the dehumidifier 14 removes moisture in the air that becomes supersaturated and condenses, and then blows it into the room as cold air from the room 115, for example, into the air conditioner, etc. used as.

Moreover, if this Preyton cycle is shown in a TS diagram in FIG. 4, when the air taken in from the outside is compressed in the state T1, the temperature rises and the state becomes T2a. Next, heat is radiated while maintaining the pressure constant to bring the state to T3, and then adiabatic expansion is performed to cool the object to the state of After blowing out heavy or cold air into the room, the system returns to the T1 state by taking in new air.

Problems to be Solved by the Invention However, in the heat exchanger used for compression 117 of the conventional air cooler mentioned above, in order to increase the contact area with the outside air and improve the heat exchange efficiency, the compressed air It is common to form the heat dissipation pipe portion of the piping through which the water flows into a 99-fold shape.

Therefore, in conventional compressors, in order to ensure sufficient contact area with outside air, it is inevitable that the heat exchanger must be enlarged to some extent, resulting in an increase in the overall size of the air cooler. There was a problem.

This invention was made against the above-mentioned technical background.
It is an object of the present invention to provide an air cooler that is made compact in its entirety by downsizing the heat exchanger.

Means for Solving the Problems As a means for solving the above-mentioned problems, the present invention radiates heat from heated air that is compressed by a compressor and flows through pipes using a heat exchanger, and then thermally insulates the air using an expander. Expand and cool;
In an air cooler that cools an object to be cooled with this cooling air, the heat exchanger has one end as a vaporizing part that receives heat from the heat radiation part of the piping, and the other end as a condensing part that releases heat to the outside. It is characterized by including a heat pipe.

Operation With the above configuration, the air compressed by the compressor and heated up loses heat to the evaporation section of the heat exchanger's pipe, and then the temperature decreases. The air is adiabatically expanded and cooled, and this cooled air cools the object to be cooled. Then, in the heat pipe of the heat exchanger, when the evaporation part is heated by the heat taken from the section of the heat radiation part of the piping through which the heated air flows,
The condensable working fluid sealed in the heat pipe becomes black and moves to the condensing section, where it radiates heat and condenses, returns to a liquid phase, and flows back to the evaporation section.

Then, it is repeatedly heated and evaporated in the evaporation section, resulting in highly efficient heat exchange.

Therefore, by using a heat pipe, a small and high-performance heat exchanger can be obtained, and the air cooler can be made more compact.

Embodiment Hereinafter, one embodiment of the air cooler of the present invention will be described based on FIGS. 1 and 2.

The air cooler includes a compressor 131 that compresses air, and a drive source 32 such as an electric motor that drives the compressor 1131. A heat exchanger 33 is provided on the discharge side of the compressor 131. In addition, an expansion turbine 3 is provided on the outflow side of the heat exchanger 33.
4 is provided, and a dehumidifier 35 is provided downstream of the expansion turbine 34.

The rotational shaft of the expansion turbine 34 is connected to the rotational shaft of the compressor 31 by a connecting shaft 36, and the compressor 31 is rotationally driven by the rotational force of the expansion turbine 34 when the compressed air expands adiabatically. It has become so.

Further, the air that has been adiabatically expanded and cooled by the expansion turbine 34 and dehumidified by the dehumidifier 35 is sent to a load 37 such as a cooling brass guide and used as cooling air.

Further, the moisture separated from the air by the dehumidifier 35 is sent to the heat exchanger 33 via the pipe 38, and is sprayed into the air from the sprayer 38a at the tip of the pipe 38, thereby exchanging heat! ! To! ! The temperature of the cooling air is lowered by removing heat of vaporization from the cooling air taken into the cooling air.

The heat exchanger 33 is equipped with a heat pipe 40 in which a condensable working fluid is sealed, and the outer periphery of the evaporation part 40a (on the right side in FIG. 2) of the heat pipe 40 is provided with a compressed working fluid. A section of the heat dissipating section 39a of the arrangement g39 through which the air flows is arranged so as to directly touch the outer circumferential surface of the heat pipe 40. Further, the heat pipe 40
The condensing part 40b side is arranged so as to face a flow path of cooling air taken in from the outside by a fan 41 and whose temperature has been lowered by water sprayed from a sprayer 38a.

In addition, in FIG. 1, TI, T2a, and T3.

T4a and T5 are T1°T on the TSa diagram shown in Figure 4.
2a, T3, T4a, and T5, respectively.

Next, to explain the operation of this embodiment, the air whose temperature has been increased by being compressed by the compressor 31 flows through the distribution I@39 and is sent to the heat exchanger 33.
The heat is removed and cooled in the heat dissipation part 39 wrapped around the outer circumference of 0a, and the air is cooled significantly by adiabatic expansion in the expansion turbine 34, and further dehumidified in the dehumidifier 35, and then becomes low-temperature air. For example, the air is sent to a load 37 in a room to be cooled, and is used as cooling air.

Further, the heat pipe 40 of the heat exchanger 33 is connected to the evaporation section 40.
The condensate g40 is heated by the heat taken from the air which has become rod-temperature, and the working fluid sealed inside evaporates and moves to the condensing section 40b, and is cooled by the cooling air.
The heat is dissipated in b, condensed and returned to a liquid phase working fluid, which is then returned to the evaporation section 40a by the capillary action of a wick (not shown) provided on the inner periphery of the heat pipe 40. In this way, it is placed in the steamer J1 part 40a and evaporates by taking heat from the outside,
Further, heat is dissipated and condensed repeatedly in the condensing section 40b, thereby lowering the temperature of the air that has been heated up due to compression.

As described above, in the heat exchanger 33, the vapor of the working fluid evaporated in the evaporation section 40a of the heat pipe 40 is compressed and the heat of the heated air is transferred to the condensation section 40 in the form of latent heat of vaporization.
Since the heat is instantly transported and radiated to b, heat exchange is performed efficiently, and the temperature of the compressed air is lowered, so that the cooling temperature during the adiabatic expansion performed in the next expansion turbine 24 is lower. I'm trying to make it happen.

In the above embodiment, the moisture separated from the air by the dehumidifier 35 is exchanged with heat! Since the temperature of the cooling air is lowered by spraying it onto the cooling air of the a33 and taking away the heat of vaporization, the heat exchange efficiency of the heat exchanger 33, that is, the air cooling efficiency is improved.

In addition, since the rotation shaft of the expansion turbine 34 and the rotation shaft of the pressure sensor 131 are connected by the connection shaft 36 and configured to rotate together, the rotational force of the expansion turbine 34 is can be used as the driving force for the compression 1131, resulting in significant energy savings.

In addition, as a driving method for the compressor 31, in addition to an electric motor, for example, in an automobile, a turbine rotated by engine exhaust gas can be used as a driving source, and in particular, a large refrigerator such as a refrigerator truck or a refrigerated truck can be used. Suitable for cases where:

As described in detail, the air cooler of this invention cools the heated air, which is compressed by a compressor and flows through piping, is radiated by a heat exchanger, and then adiabatically expanded by an expander. However, in an air cooler that cools the object to be cooled with this cooling air,
Since the heat exchanger is configured to include a beat pipe with one end serving as an evaporating part that receives heat from the heat radiating part of the piping and the other end serving as a condensing part that releases heat to the outside, the heat exchanger has a high performance. As a result, the heat exchanger can be made smaller and the air cooler can be made more compact.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the present invention; Figure 1 is a schematic diagram showing the structure of an air cooler, Figure 2 is an enlarged view of its main parts, and Figures 3 and 4. 3 shows a conventional example, and FIG. 3 is a schematic diagram of the conventional air cooler, and FIG. 4 is its TsJI diagram. 31... Compressor, 32... Drive source, 33...
Heat exchanger, 34... Expansion turbine, 35... Dehumidifier, 36... Connection shaft, 37... Load,
39... Piping, 39a... Heat dissipation part of piping, 40
...heat pipe, 40a...evaporation section, 40b
...condensation section.

Claims (1)

[Claims] The heated air that is compressed by a compressor and flows through the pipes is
In the air cooler, in which heat is radiated by a heat exchanger, the heat is adiabatically expanded and cooled by an expander, and an object to be cooled is cooled with this cooling air. An air cooler comprising a heat pipe having an evaporating section that receives heat and a condensing section that releases heat to the outside at the other end.