Review on Performance Optimization of Absorption Heat Pump Systems Based on Finite-Time Thermodynamics

摘要

Most of industrial processes use a lot of thermal energy by burning fossil fuel to produce steam or heat for the purpose. After the processes, heat is rejected to the surrounding as waste. The absorption heat pump is becoming more important because it can be powered by these industrial energy wastes and hence, it poses no danger to the environment. In this paper, a literature review of the theoretical finite-time thermodynamic-based performance optimization of absorption heat pump systems independent of the used mixtures is presented. The review describes and discusses the performance objective functions for the various absorption heat pump cycle models. It covers the endoreversible and irreversible three-heat-source cycle models, four-heat-source cycle models and absorption heat transformer cycles with respect to the following aspects: the heat transfer law models, the effect of heat resistance and other irreversible loss models on the performance. Findings from published works considering the heating load, the coefficient of performance, the total heat transfer area, the thermo-economic function, the ecological function, the exergy-based ecological function and the ecological coefficient of performance as objective functions have been summarized in a table. It appears that design parameters based on the maximum of the ecological coefficient of performance conditions represent a best compromise between the heating load and the loss rate of availability.