Ecological and ecological coefficient performance of an irreversible two-stage absorption refrigeration cycle

Abstract

An irreversible finite-time thermodynamics models of a two-stage AR (absorption refrigeration) system with variabletemperature heat reservoirs is established, the ecological function and the ECOP (ecological coefficient of performance) criteria are studied. In the model, heat transfer losses between external heat reservoir and internal cycle working medium in six heat exchangers, the internal irreversible loss during the cycling process of the working medium, and the heat leakage losses between surrounding and external heat reservoir are considered. The ecological function characteristic relations and the ECOP characteristic relations are derived. Using illustrative calculation, the heat exchange inventory of six heat exchangers are redistributed and the performances are optimized based on different optimization objective function, and the characteristic relationships among optimal ecological function, optimal ECOP, optimal cooling load, optimal cycle entropy generation rate and COP are investigated.