Performance of an endoreversible four-heat-reservoir absorption heat pump with a generalized heat transfer law

An endoreversible four-heat-reservoir absorption heat pump cycle model with a generalized heat transfer law Q∝Δ(Tn) is established. The general relation between the coefficient of performance (COP) and the heating load with Q∝Δ(Tn) is deduced. The fundamental optimal relation, the optimal temperatures of working substance, as well as the optimal heat transfer surface area distributions with linear phenomenological heat transfer law are derived. Moreover, the effects of heat transfer law on the performance of absorption heat pump are analyzed and the performance comparison before and after optimizing the distribution of the total heat transfer surface area is performed by numerical example.