BASIC PERFORMANCE OF CAO H2O/CA(OH)(2) CHEMICAL HEAT-PUMP UNIT FOR NIGHT-ELECTRIC HEAT-STORAGE AND COLD/HOT HEAT-RECOVERING/

As a new technology for effective utilization of electric energy, a ch emical heat pump unit for night electric heat-storage and cold/hot hea t-recovering in daytime air-conditioning/hot-water-supply is proposed and a prototype is made. The basic heat-releasing characteristics and the effects of reactant particle amount and heat recovering condition on the characteristics are studied experimentally. It is found that th e electric energy stored as densely as 1.86 MJ/kg-CaO in the form of t hermochemical energy is released in the form of thermal energy as cold heat at around 273 K and hot heat at around 500 K. The heat is recove red as cold heat for air-conditioning at around 275 K and hot-water at around 350 K. The total amount of reactant particles should be determ ined with a balance of heat-loss, although heat releasing is improved by using a shallow bed with a small amount of particles. Furthermore, the recovered heat amount is found to be enlarged because of increased reactivity of reactant particles when the heat-recovering rate is pro perly controlled.