PERFORMANCE OF A HEAT OPERATED METAL HYDRIDE BASED WATER PUMPING SYSTEM

摘要

The principle of metal hydride based hydrogen compressor is extended to a water pumping system.Five AB_5 type hydrogen absorbing alloys namely LaNi_(4.9)Ge_(0.1), MmNi_4Al, LaNi_(4.8)Sn_(0.2), MmNi_(4.2)Al_(0.8) andLa_(0.8)Ce_(0.2)Ni_(4.25)C_(0.5)Sn_(0.25) are compared in terms of specific water pumping capacity, heat source temperatureand efficiency for various heads. The pump also delivers nearly one-fifth of the pumped water as hot water.Operating on heat energy, these pumps are suitable for high pump heads in the range of 30 m especiallywhere conventional power source is not available. Among the selected alloys MmNi4Al shows betterperformance in terms of discharge and as well as efficiency.