2020 Volume 37 Issue 3 Pages 233-
From the viewpoints of energy and environmental problems in the world, an effective thermal energy utilization has been one of the most important issues in the world. Chemical Heat Pump (CHP) is one of the technologies which is considered to contribute to the issue. By using the refrigeration mode of CHP, Chemical Refrigerator (CR) which generates cold heat below 273 K can be driven by chemically stored thermal energy such as solar heat, waste heat etc. In order to improve the evaporator performance of CR, the experimental and theoretical studies on the effects of aqueous solution components and mass transfer were performed. The results were shown as follows. (1) CR using Ethylene glycol 30 wt% - NaCl 10 wt% aqueous solution in the evaporator can release cold heat under 258 K similarly in the case of using Ethylene glycol 40 wt% aqueous solution. Ethylene glycol 30 wt% - NaCl 10 wt% aqueous solution is suitable for keeping CR longer bellow 258 K. (2) The evaporator performance was enhanced in early reaction stage by using a stirrer and changing the evaporator position. Furthermore, the synergistic effects of combining a stirrer use and evaporator position change, cold heat power in early reaction stage increased 1.9 times.
