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Heat transfer strengthening device for natural convection heat dissipation and design method thereof

A technology of natural convection and design method, applied in electrical equipment structural parts, cooling/ventilation/heating renovation, electrical components, etc. Reliability and other issues, to achieve the effect of enhancing natural convection heat transfer efficiency, improving air convection heat transfer coefficient, and good convection heat transfer effect

Active Publication Date: 2018-12-04
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During periods of strong sunlight, the temperature of the outdoor air rises, and the cooling effect of the surface of the equipment to be cooled will be greatly affected, which will have a great impact on the control and adjustment of the equipment. In severe cases, the equipment will be shut down, which will seriously affect the reliability of the equipment operation.

Method used

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  • Heat transfer strengthening device for natural convection heat dissipation and design method thereof
  • Heat transfer strengthening device for natural convection heat dissipation and design method thereof
  • Heat transfer strengthening device for natural convection heat dissipation and design method thereof

Examples

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Effect test

Embodiment 1

[0048] see Figure 7 and Figure 8 , for the comparative calculation of the surface temperature distribution of the equipment to be cooled before and after adding semicircular auxiliary heat dissipation surfaces and V-shaped fins in outdoor environments. The basic conditions are: take a rectangular plate with an aspect ratio of 5 / 3 as an example on the surface of the equipment to be cooled, in an outdoor environment. The surface heat flux of the equipment to be cooled is regarded as twice the average solar radiation heat flux, ignoring the influence of natural wind.

[0049] Figure 7 Shown is the surface temperature distribution of the equipment to be cooled, the average surface temperature is: 506.746K.

[0050] Figure 8In order to increase the surface temperature distribution of the equipment to be cooled after the semicircular auxiliary heat dissipation surface and the V-shaped fins are added. The semicircular auxiliary heat dissipation surface takes the length of th...

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PUM

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Abstract

The invention discloses a heat transfer strengthening device for natural convection heat dissipation and a design method thereof. The heat transfer strengthening device comprises an auxiliary heat dissipation wall fixedly disposed on the surface of a device to be cooled. The auxiliary heat dissipation wall and the surface of the device to be cooled constitute a cylindrical ventilation passage. Thecross-sectional area of the cylindrical ventilation passage remains unchanged or gradually decreases along the flow direction of an air flow. The auxiliary heat dissipation wall is provided with a plurality of vents. The heat transfer strengthening device of the invention can be applied to the surface of a device based on natural convection heat transfer, can improve an air natural convection heat dissipation effect, can retard sunlight irradiation, and can reduce the surface temperature of the outdoor device to be cooled. The auxiliary heat dissipation wall can avoid the direct radiation ofthe sunlight to the surface of the device to be cooled, thereby reducing the total amount of heat dissipation of the device. The cylindrical ventilation passage can form a chimney suction effect to effectively increase the natural convection velocity of the air near the surface of the device to be cooled, so as to strengthen the heat transfer.

Description

technical field [0001] The invention belongs to the technical field of natural cooling, and is mainly aimed at outdoor electronic equipment, electrical equipment and energy power equipment relying on air natural convection for heat dissipation, and particularly relates to a natural convection heat exchange enhancement device and a design method thereof. Background technique [0002] Electronic equipment, electrical equipment, and energy power equipment operate in an outdoor environment and rely on natural air convection for natural cooling. In the outdoor environment, the equipment itself generates heat, and the surface of the equipment will be directly radiated by the sun. The surface heat flux density of the equipment, especially the high-power equipment, will reach several thousand watts per square meter. During periods of intense sunlight, the temperature of the outdoor air rises, which will greatly affect the heat dissipation effect of the surface of the equipment to be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K7/20
CPCH05K7/20127
Inventor 李平郭丁彰
Owner XI AN JIAOTONG UNIV
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