1840 自然空冷筐体の熱性能に対する体積空隙率の影響  [in Japanese] Effect of volume porosity coefficient to the thermal performance for natural air cooled electronic equipment casing  [in Japanese]

In this paper are presented the results of an experimental study on the chimney effect in a natural air-cooled electronic equipment 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. 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. And, volume porosity coefficient in the casing was also varied from 46.4% to 100.0% with flow obstacles when power dissipation was 30W. The result is that average temperature rise in the casing didn't increase until volume porosity coefficient was about 50%, but maximum and wall temperature rise were increase almost linearly.