关键词: 反应床, 金属氢化物, 空调, 汽车, 尾气

Abstract: A function proving automobile metal hydride(MH) refrigeration/air conditioning system is designed. The MH working pair LaNi4.61Mn0.26Al0.13/La0.6Y0.4Ni4.8Mn0.2 with working temperature 150 oC/20~50 oC/0 oC is researched, their Van’t-Hoff diagram is drawn and reaction enthalpy, entropy, theoretical cycling coefficient of performance (ε0) as well as minimum refrigeration temperature (θm) are deduced. Based on this working pair, reaction beds are designed, a function proving MH intermittent refrigeration water cooling system driven by heat conducting oil is constructed. The regulations of cycling performance and θm are determined by altering the average temperature of high temperature reaction beds. The test results show that the MH working pair has satisfied reaction dynamics and small hysteresis; The low temperature MH reaction enthalpy reaches ?27.1 kJ/mol H2. The reaction beds have perfect mass transfer ability, while their heat conduction coefficients are merely 1.5 W/(m·K) which results in long cycle period and low cooling power per MH. Intermittent refrigeration cycle is achieved, 238 W cooling power is obtained at 150 oC/30 oC/0 oC with ε0 being 0.26. In the test range, with the growth of average temperature of the high temperature reaction beds, cooling power and system ε0 increase while θm decreases, which agrees well with MH refrigeration theories.

Key words: Air conditioner, Automobile, Exhaust gas, Metal hydride, Reaction bed