Abstract
The surface temperatures of the inner lamp and the outer glove of a spherical lighting fitting, the surfaces of which are painted black, are measured. From the results the average cnonvective heat transfer coefficients between the inner lamp and the outer glove and on the outer surface of the glove are obtained. These data are correlated with the aid of existing equations for two concentric spheres and the outer surface of a single sphere. The relationships between the maximum and mean temperature on the lamp and the glove are also obtained. By the use of these equations a method for the optimal thermal design of spherical lighting fittings is proposed.
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