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Compromise optimization between heating load and entropy production rate for endoreversible absorption heat pumps

SYNOPSIS On the basis of an endoreversible four-heat-reservoir absorption heat pump cycle model with linear (Newtonian) heat transfer law, an ecological optimisation criterion is proposed for the best mode of operation of the cycle, which consists of maximising a function representing the best compromise between the heating load and the entropy production rate. The optimal relation between the ecological criterion and the COP (coefficient of performance), and the maximum ecological criterion and the corresponding COP, heating load and entropy production rate are derived by using finite-time thermodynamics. Moreover, the ecological performance is compared with that for the heating load criterion by numerical example. The results reflect that ecological criterion is a factor which can have long-term significance for optimal design of absorption heat pumps.