Abstract
For effective utilization of thermal energy in sustainable development of society, chemical heat pump (CHP) systems are considered to be an effective system in the near future. The CHP can store thermal energy in the form of chemical energy, and release it at various temperature levels. Especially, we studied a calcium oxide/water CHP and a calcium sulfate/water CHP. Each of these CHPs has its merits and demerits, so the form of apparatus and system design suitable for the situation are very important. In this study, we calculated basic performances of the CHPs based on our previous theoretical and experimental data. Furthermore, we proposed thermal energy recycling utilization systems using CHPs from heat sources to heat applications in some case processes such as industrial drying process, engineering plant etc. As heat sources, unutilized energy such as waste heat from engineering plant and incinerator, surplus exhaust heat from a decentralized cogeneration system and renewable energy such as solar thermal, geothermal are considered. As heat applications, space heating/cooling, hot/cold water supply, drying, dehumidification, and ice production are considered. We calculated the total energy efficiencies and cost estimations of the proposed systems. As a result, it was found that the effective energy utilization system could be constructed by designing suitable CHP based systems using a calcium oxide/water CHP and a calcium sulfate/water CHP for sustainable society construction.
