Thermodynamic analysis of two-stage ternary metal hydride heat pumps

This paper presents a thermodynamic analysis of two-stage metal hydride heat pumps (MHHP) employing three alloys. Results are obtained for five different combinations involving eight alloys. The operating temperatures and pressures are chosen so that the MHHP operates in the dual-effect mode, i.e. delivers both heating and refrigeration effects. Overall coefficient of performance (COP) values in the range 2.0-3.2 and second law efficiencies in the range 0.5-0.8 are obtained. © 1992.