Abstract
The performance and properties of hydrogen storage materials for application in heat pump systems will be evaluated. The metal hydride heat pump using solar energy for hot water (TH=100~130℃) may cool the room temperature water (TM=30℃) to a lower temperature water (TL=~20℃). Two parts of experiment will be performed to study the hydrogen storage properties of LaNi5-xMx-based alloys. In the first part of experiment, the P-C-T curves and hydrogen absorption-desorption kinetics will be measured. The effects of the alloying element M and the second phase on the hydrogenation properties of the alloys will be examined. The reaction enthalpy of hydriding –dehydriding can be calculated from the Van’t Hoff plot. Based on the characteristics of P-C-T curves, the optimum material composition can be evaluated. In the second part of experiment, the calorimetry will be employed to directly measure the reaction enthalpy of hydriding –dehydriding. The performance of cooling of the heat pump system will be evaluated.