Abstract :
A refrigeration cycle is modeled as a demonstration of an irreversible absorption refrigeration cycle. This four-temperature-
level model takes into account the heat resistance, heat leakage, and irreversibilities due to internal dissipation
of the working fluid. The fundamental optimal relationships between: (1) the coefficient of performance (COP) and the
cooling load; (2) the maximum COP and the corresponding cooling load; and (3) the maximum cooling load and the
corresponding COP of the cycle, all coupled to constant-temperature heat reservoirs, are derived by using finite-time
thermodynamics. The optimal distribution relationships of the heat-transfer surface areas are also presented. 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 useful for optimal design and performance improvement of absorption refrigeration
cycles.
2005 Elsevier Ltd. All rights reserved.
