Metal hydride air conditioning of the waste heat of automobile engine coolant driving
Aiming at developing metal hydride air-conditioning system driven by the waste heat of automobile engine coolant, the principle of metal hydride air-conditioning system was introduced and a hydride pair LaNi4.7Al0.3/LaNi5 was developed working at 363 K/303 K/283 K. the working cycle was described in detail. the values of characteristic parameters of the metal hydrides used in the system were also given.
Prediction of transient heat and mass transfer in a closed metal–hydrogen reactor
Abstract The metal–hydrogen reactor is usually composed of a porous medium (hydride bed) and an expansion volume (gaseous phase). During the sorption process, the hydrogen flow and the heat transfer in the expansion part are badly known and can have some effects on the sorption phenomena in the hydride medium. At our knowledge, the hypothesis that neglects those effects is typically used. In this paper, a 2D study of heat and mass transfer has been carried out to investigate the transient transport processes of hydrogen in the two domains of a closed cylindrical reactor. A theoretical model is conducted and solved numerically by the control-volume-based finite element method (CVFEM). The result on temperature and hydride density distribution are presented and discussed. Moreover, this paper discusses in detail the effects of some governing operating conditions, such as dimensions of the expansion volume, height to the radius reactor ratio, and the initial hydrogen to metal atomic ratio, on the evolution of the pressure, fluid flow, temperature and the hydrogen mass desorbed.
Reaction kinetics of metal hydrides and their mixtures
Reaction rates in the hydriding and the dehydriding processes were studied experimentally for hydriding alloys such as LaNi5, MmNi5(Mm  mischmetall), aluminium-substituted mischmetall nickels, TiMn10.5 and Ti0.8Zr0.2Cr0.8Mn1.2. We also studied binary mixtures of these hydriding alloys to examine the effects of mixing on the kinetic properties. A term N was introduced for the evaluation of the pressure and temperature dependences of the reaction rate.