Abstract
The present work is concerned with numerically studying the thermal behaviour of a packed bed storage system under various wall temperatures. The packed bed is mathematically described using a two-phase model, in which the air and solid phases are governed by two coupled partial differential equations representing the energy conservation in each phase separately. The axial and radial conduction in the solid are taken into account while the thermal conductivity of air is ignored. The modeling equations are numerically solved at various fixed wall temperatures, ranging from 5°C to 55°C. The temporal, axial and radial distributions of air and solid temperatures obtained during thermal charging of the bed are studied, and used to compute and investigate the behaviour of energy stored inside the bed as well as the heat loss to the surroundings under such a wide range of wall temperatures.
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