An Experimental Study to Determine the Heat Transfer Coefficients during Heating and Cooling of Gravel (Porous Material) through Passing Air
Keywords:
fixed bed, porous media, volumetric coefficients, heat transfer.Abstract
The increasing global demand for energy has strongly stimulated the search for new energy sources and methods of storage. In this paper, we propose the study of thermal storage in a porous medium by sensible heat. The main aim of our investigation is to experimentally determine the volumetric coefficients of heat transfer in a fixed bed and also to obtain the correlations between mass flow rates and these coefficients. To achieve these objectives, a pilot plant was set up. The experiments carried out were done on a fixed bed of gravel of porosity with hot air blown from the bottom to the top under different conditions of temperatures, mass flow rates, and bed heights. We found that the heat transfer coefficients in the case of cooling the bed are generally higher than those of heating by a ratio of about 5.51%.
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