KINETIC STUDY OF MAGNESIUM OXIDE/WATER CHEMICAL HEAT PUMP

摘要

A laboratory scale system of magnesium oxide/water chemical heat pump was designed for the heat output of 100W class, and the performance of the system was demonstrated. The fraction of magnesium oxide reacted and the heat output were measured directly and simultaneously in the experiment. The former was performed by measuring weight change with a load cell. The latter was measured with a heating tube installed in the reactor. It was shown that the system was able to store thermal energy at about 400°C and to supply thermal energy at 75-f20°C, and that the thermal power exceeded 50-f 00W per 1 kilogram of initial magnesium hydroxide during the first 60 minutes. The profile of reaction rate and heat transfer in the reactor were simulated by two-dimensional numerical analysis. The results of the experiments and the simulations showed that the heat pump had enough thermal storage capacity and thermal power as a commercial system.