Abstract
Thermochemical energy storage (TES) using metal hydroxides has great potential to be used with high temperature solar power applications. TES using an indirectly heated cylindrical reaction bed for Ca(OH)2/CaO reaction system is selected for this study. Heat storage and release are carried out through endothermic dehydration of Ca(OH)2 and exothermic hydration of CaO. The bed is heated and cooled indirectly by the heat transfer fluid (HTF) flowing perpendicular to the bed axis. The reaction gas (steam) enters and leaves the bed from its top surface during hydration and dehydration respectively. Transient heat and mass transport equations coupled with chemical reaction kinetics are used for simulation of charging and discharging processes in three-dimensional geometry. The governing equations are solved using finite element method. Conversion of reactants into products and the temperature evolution within the reaction bed and HTF channel are reported for various bed sizes and Reynolds numbers within the laminar flow regime of the heat transfer fluid. It is observed that the selected reactor configuration offers clear advantages over the other configurations studied so far in terms of heat transfer and mass transport.
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