抄録
From the viewpoints of energy and environmental problems in the world, effective thermal energy utilization has been one of the most important issue in the world. Chemical Heat Pump (CHP) can be considered to contribute to the issues greatly. The CHP can store unutilized thermal energy such as industrial waste heat in the form of chemical energy, and release it at various temperature levels during the heat demand period. The authors have proposed and developed the CHP unit using calcium oxide/calcium hydroxide hydration/dehydration reversible reactions: CaO/H2O/Ca(OH)2 for heat storing and high/low-temperature heat generating. In this study, the authors performed experiments on the effects of sample purities, reaction repetitions, heat exchange flow rates, samples quantities for performance enhancement of the CHP unit.
As a result, the reaction conversions of low purity sample (Garou CaO) in repetition experiments are found to increase although the initial conversion is lower than those of high purity samples (Hiroshima CaO, Kawara CaO) reaction. The effects of heat exchange flow rates in heat storing/releasing step were shown for the reaction enhancement. Furthermore, the peak temperature of samples in heat releasing is upgraded at 35 K and the reaction rate is improve to almost twice by reducing the sample amount to sample tray level.
