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Heat exchanger and refrigeration cycle apparatus

Inactive Publication Date: 2010-05-06
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]The fine pores are formed on the surface of the fin of the heat exchanger such that the fin itself functions as the water adsorbing unit using the capillary condensation phenomenon. The heat exchanger capable of making the fins adsorb water contained in air in the subject space may be provided without requiring special means and materials. The peeling-off of the supported adsorbing member never occurs, thus it is safe from the viewpoint of sanitation and easy to manage. No pressure loss of air caused by the adsorbing material occurs, so that efficient heat exchange can be performed in view of the energy consumption. Since it is not necessary to provide adsorbing material, the apparatus can be made compact. By making each diameter of the fine pores different depending on the position on the fin surface, it is possible to obtain the heat exchanger appropriately performing adsorption / desorption while being suitably adapted to the environment.

Problems solved by technology

The deposited frost narrows a gap through which air passes, thus interfering with the air flow.
Heat exchange between the refrigerant and air cannot be appropriately performed, thus deteriorating operation efficiency.
The defrosting may remove the frost adhered to the evaporator, but consumes an extra energy, thus failing to improve the efficiency of the air conditioning system.
In such a case, the load for cooling up to a required temperature range is increased, thus further consuming electric power, resulting in efficiency deterioration.
However, a latent heat (water content in the air (vapor)) may not be removed.
If the latent heat in the room cannot be removed, the relative humidity in the air in the room will be increased, which cause discomfort of the person in the room to increase.

Method used

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  • Heat exchanger and refrigeration cycle apparatus
  • Heat exchanger and refrigeration cycle apparatus
  • Heat exchanger and refrigeration cycle apparatus

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0076]FIG. 1 shows an essential portion of a heat exchanger 40 according to Embodiment 1 of the present invention. The structure of the heat exchanger 40 as the featuring part of the present invention will be described referring to FIG. 1. The heat exchanger of a fin tube type which has been widely used for the refrigerator and air conditioning system will be explained as an example.

[0077]The heat exchanger 40 is mainly composed of plural fins 45 for heat exchanger (hereinafter referred to as a fin 45), and plural heat transfer pipes 46. The fin 45 of the present embodiment is a flat plate made of the material with a high thermal conductivity (thermal conductivity: approximately 230 W / mK) such as aluminum. The fin 45 has fine pores on the surface as described later. The plural fins 45 are laminated at a predetermined interval. The heat transfer pipes 46 are provided, for example, at a predetermined interval so as to penetrate through holes formed in each fin 45. Each heat transfer p...

example 2

[0098]FIG. 6 is a configuration view showing an essential portion of a heat exchanger 40a according to Embodiment 2 of the present invention. In FIG. 6, fins 45aa, 45ab, 45ac are made to have fine pores with different diameters for each column along the air flow direction. That is, against the air flow direction upon the adsorption, the fine pore diameter at an upwind side is made large, and that at a downwind side is made small. Therefore, in the case of FIG. 6, the fine pores are distributed in such an aspect that fine pore diameter on the first column 45aa>fine pore diameter on the second column 45ab>fine pore diameter on the third column 45ac.

[0099]FIG. 7a shows a simulated result of the relative humidity distribution of the air flow direction (column direction of the heat transfer pipe) of the heat exchanger using fins having the same fine pore diameter. The water content of the fin 45 has a feature to rise up at the relative humidity of approximately 30%. From the heat transf...

embodiment 3

[0113]In the above Embodiment 1, the fin 45 is made of aluminum, however, the material is not limited to the aluminum. For example, the so-called valve metal may be used as the material of the fin 45 to form fine pores on the surface through the anodic oxidation. The valve metal refers to a generic name of a metal which forms an oxide film showing an electrolytic rectifying operation through the anodic oxidation such as aluminum, tantalum, niobium, titanium, hafnium, zirconium, zinc, tungsten, bismuth and antimony. Among them, metals such as aluminum, titanium, zirconium, niobium, and tantalum may be practically used as the fin 45. The use of those metals may provide the same effect as aluminum.

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PUM

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Abstract

Heat exchangers 40, 40a, 40b for performing heat exchange between a refrigerant and air include fins 45, 45a, 45b for heat transfer, each of which has fine pores each having a diameter ranging from 1 to 3.5 nm for adsorbing water contained in the air by a capillary condensation phenomenon. Preferably, the fine pores are distributed having a different diameter in accordance with the position of the fins 45, 45a, 45b on the surface.

Description

TECHNICAL FIELD[0001]The present invention relates to a heat exchanger for adsorbing water content in the air, and a refrigeration cycle apparatus having the same.BACKGROUND ART[0002]In a refrigeration cycle apparatus using a refrigeration cycle such as an air conditioning system and a refrigeration system, a compressor, a condenser (heat exchanger), an expansion valve, and an evaporator (heat exchanger) are basically connected with the pipe to form a refrigerant circuit for circulating a refrigerant such as a geotropic refrigerant mixture, a pseudo azeotropic refrigerant mixture, and a single refrigerant. Utilizing that the refrigerant absorbs and radiates heat against air subjected to the heat exchange upon evaporation and condensation, the air-conditioning and cooling operations are performed while changing the pressure of the refrigerant passing through a pipe.[0003]The heat exchanger functioning as the evaporator and the condenser allows the refrigerant to pass through the pipe...

Claims

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Application Information

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IPC IPC(8): F25B1/00F28F1/20F24F3/14F25B49/02F25D17/04F24F1/0063
CPCF24F1/0059F24F1/027F24F3/14F24F13/222F24F2110/20F28F1/32F28F13/187F28F17/005F24F11/30F24F2011/0002F24F1/0063F24F11/65
Inventor MORIMOTO, HIROYUKISUGIMOTO, TAKESHIMATSUOKA, FUMIOYAMASHITA, KOJIYAMASHITA, TETSUYAMAEGAWA, TAKEYUKI
Owner MITSUBISHI ELECTRIC CORP