自然空冷機器における障害物が及ぼす流体抵抗の影響(J01-5 筐体放熱設計,J01 エレクトロニクス実装における熱制御および信頼性評価)

概要

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In this paper are presented the results of an experimental and numerical study on the flow resistance values by the obstacles in a natural air-cooled electronic equipment casing derived by using the design formula. Experiments have been carried out using a ventilated electronic equipment-casing model, with a wire-heater inside and inlet and outlet vents on the walls of the casing. In order to evaluate the natural convective air-cooling capability, the chimney height that is defined as the distance between the main heat dissipated component and outlet vent has been varied. Arid, volume porosity coefficient in the casing was also varied from 46.4% to 100.0% with flow obstacles being varied when power dissipation was 30W. It is found that the average temperature rise and the flow resistance coefficient in the casing didn't increase until volume porosity coefficient was about 50%, but maximum and wall temperature rise were increase almost linearly.
2004-09-04