Abstract:A new hydrogen storage alloy pair LaNi_4.45Cu_0.3Al_0.14—ML_0.99Ni_4.4Fe_0.6 was studied for a bus hydride air conditioners, in which ML means La-riched mischmetal. The waste heat from exhaust gas of the bus engine was used as the high temperature heat source and the atmosphere was used as the heat sink. LaNi_4.45Cu_0.3Al_0.14 was used as hot side alloy, its effective hydrogen capacity, hysteresis factor f_h(=p_a/p_d) and sloping factor f_s(=dlnp_d/dn_H) are 5.67mol/kg, 1.16, 0.13, respectively. ML_0.99Ni_4.4Fe_0.6 was used as cool side alloy with its three aforesaid properties being 5.68 mol/kg, 1.33, 0.12, respectively. From the theoretic calculations for the new alloy pair the theoretic COP_c(0.55) and E_out(1 407.9 kJ/kg·h) were obtained under operating temperatures of 150℃/40℃/20℃and 6 min cycling time.

Key words: hydride　hydrogen storage alloy　bus　heat pump　air conditioner