THE MAXIMUM COP AND THE MAXIMUM COOLING LOAD OF AN IRREVERSIBLE FOUR-HEAT-RESERVOIR ABSORPTION REFRIGERATOR

摘要

On the basis of an endoreversible absorption refrigeration cycle model with Newton's heat transfer law, a real absorption refrigerator model, that is, an irreversible four-heat-reservoir cycle model is established in this paper by taking account the heat resistance, heat leak and irreversibilities due to the internal dissipation of the working fluid. The performance limits, that is, the maximum coefficient of performance (COP) and the corresponding cooling load, as well as the maximum cooling load and the corresponding COP of the cycle coupled to constant-temperature heat reservoirs are derived by using finite-time thermodynamics. The optimal distribution relation of the heat-transfer surface areas is also obtained. Moreover, the effects of the cycle parameters on the performance limits of the cycle are studied by detailed numerical examples. The results of this paper include the performance limits of almost all kinds of the refrigeration cycles with Newton's heat transfer law.