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Abstract
Thermochemical heat storage is a promising technology for improving energy efficiency through the utilization of low-grade waste heat. The formation of a SrCl2 ammine complex was selected as the reaction system for the purpose of this study. Discharge characteristics were evaluated in a packed bed reactor for both the gas-solid reaction and the liquid-solid reaction. The average power of the gas-solid reaction was influenced by the pressure of the supplied ammonia gas, with greater powers being recorded at higher ammonia pressure. For the liquid-solid reaction, the obtained average power was comparable to that obtained for the gas-solid reaction at 0.2 MPa. Moreover, the lower heat transfer resistance in the reactor was observed, which was likely caused by the presence of liquid ammonia in the system. Finally, the short-term durability of the liquid-solid reaction system was demonstrated over 10 stable charge/discharge cycles.
Highlights
The efficient use of energy is extremely important due to the ongoing depletion of energy resources and in the context of environmental protection
Thermochemical heat storage is a promising technology for improving energy efficiency through the utilization of low-grade waste heat
The average power of the gas-solid reaction was influenced by the pressure of the supplied ammonia gas, with greater powers being recorded at higher ammonia pressure
Summary
The efficient use of energy is extremely important due to the ongoing depletion of energy resources and in the context of environmental protection. The charging operation involves the endothermic gas-solid reaction shown in Equation (1), which charges heat to the reactor, and where the released ammonia vapor is transported to the condenser. In this study, both a liquid-solid reaction and a gas-solid reaction are employed for heat discharge. In terms of the discharge operation using the gas-solid reaction shown in Equation (2), the ammonia vapor is transported from the evaporator to the reactor, where an exothermic reaction subsequently occurs. The powder was dried at 200 ̊C for 12h in an electric furnace
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