Experimental and numerical investigations on the performance of dehumidifying desiccant beds composed of silica-gel and thermal energy storage particles |
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Authors: | M A Rady |
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Institution: | (1) TREFLE UMR 8508, University of Bordeaux, ENSAM, ENSCPB, 33607 Pessac Cedex, France;(2) Mechanical Engineering Department, Benha High Institute of Technology, Benha University, Benha, 13512, Egypt |
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Abstract: | Enhanced efficiency of the adsorption process in the dehumidifier is a key element for improved performance of desiccant cooling
systems. Due to the exothermic nature of the adsorption process, the dehumidification and cooling capacity are limited by
significant temperature changes in the adsorption column. In the present study, the effects of integration of sensible and
latent heat storage particles in the desiccant bed for in situ management of released adsorption heat are investigated. For
this purpose, column experiments are performed using an initially dry granular bed made of silica-gel particles or a homogeneous
mixture of silica gel and inert sensible or latent heat storage particles. The packed bed is subject to a sudden uniform air
flow at selected values of temperature and humidity. Also, a packed bed numerical model is developed that includes the coupled
non-equilibrium heat and moisture transfer in the solid and gas phases. Investigations of the heat and mass transfer characteristics
are reported using the composite structure and the results are compared with the base case of simple silica gel bed. Improved
desiccant cooling system performance can be obtained by appropriate adjustment of desiccant cycle operation and proper choice
of the volume ratio of thermal energy storage particles. |
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