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Membrane based energy exchange has been into air-conditioning and desalination research for quite some time due to its enhanced abilities to separate the desiccant solution channel from the air channel and efficient energy exchange. However, a V-MEMD i.e. vacuum multi-effect membrane desiccant regenerator is under sub-atmospheric pressure, unlike conventional liquid to air membrane energy exchange (LAMEE) or run around membrane energy exchange (RAMEE) dehumidifier. This study aims to provide a thermal performance analysis of a V-MEMD test bed for the regeneration of desiccant solution. The regeneration system is used for concentrating the desiccant by removing water vapor from the solution. The energy recovery is carried out by multi-effect evaporation, and the mass transfer across the membrane is driven by low grade thermal and pressure gradient. This study analyzes the thermal performance and percentage increase in desiccant concentration for highly concentrated aqueous lithium chloride solutions when subjected to V-MEMD regeneration. Different operating parameters were examined experimentally to determine the optimum performance of high concentration desiccant solutions. Further comparisons of regenerator performance for different concentrations of LiCl are presented along with analysis.

Experimental Investigation of a Multi Effect Membrane Based Regenerator for High Concentration Aqueous LiCL Solution as Desiccant