Abstract
Natural air cooling technologies of electronic equipment have important advantages of no fan and high reliability. However, natural air cooling has lower cooling capability than fan air cooling, so the cooling capability enhancement has been required. In this paper are presented the results of the experimental casings on the chimney effect in natural air-cooled electronic equipment. The system box is inclined for the purpose to enhance the capability of natural air-cooling. Experiments have been carried out using a model of thin laptop PC. The influence of the box inclination, outlet positions and numbers, and the porosity coefficient of outlet openings on the cooling capability was investigated. The results show that the temperature values inside casing and heater surface are gently diminished by the effect of increase in inclination and porosity coefficient of outlet openings. Moreover, the increase in natural circulation flux in the box is quantitatively proven by experiments. The experimental data were reduced to a Nusselt number-Rayleigh number correlation by using modified the reference length.
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