Abstract
A novel compressor operated resorption thermochemical energy storage system (CRTES) is proposed for heat storage, combined cooling and heat upgradation. The system uses halide salt-ammonia working pairs due to their wide working temperatures, high sorption capacity, and low cost. The CRTES system works on a simple resorption system during energy storage process and with a compressor during energy recovery process. The thermodynamic performance of the CRTES system is analyzed and compared for several halide salt pairs by considering the cooling temperatures of 5, 10, and 15 °C. The effect of variation in compression ratio and cooling temperature on heat up gradation, energy storage efficiency and COP of the CRTES system is studied. The highest degree of heat up gradation and energy storage efficiency are obtained using FeCl2-NaBr and SrCl2-KI, respectively. The higher COPs are obtained using KI as regenerating salt. The CRTES system based on FeCl2 and MnCl2 can be used for medium temperature energy storage (>100 °C) as the heat storage temperature is in the range of 153 to 176 °C. while the system based on SrCl2 and CaCl2 can be used for low temperature energy storage (≤100 °C) as the heat storage temperature is in the range of 84 to 93 °C.
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