Performance optimization of an irreversible four-heat-reservoir absorption refrigerator

Tong Zheng, Lingen Chen, Fengrui Sun and Chih Wu

Applied Energy, 2003, vol. 76, issue 4, 414 pages

Abstract: On the basis of an endoreversible absorption refrigeration cycle model with linear phenomenological heat transfer law of Q[is proportional to][Delta](T-1), an irreversible four-heat-reservoir cycle model is built by taking account of the heat resistance, heat leak and irreversibilities due to the internal dissipation of the working fluid. The fundamental optimal relation between the coefficient of performance (COP) and the cooling load, the maximum 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 COP and the cooling load of the cycle are studied by detailed numerical examples. The results obtained herein are of importance to the optimal design and performance improvement of real absorption refrigerators.

Date: 2003
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