Thermodynamic and crystallization analysis of absorption-recompression system and comparison withconventional absorption cycle

In present work single effect absorptionrecompressionrefrigeration cycle in which compressoris located between the generator and condenser, isanalyzed and compared with a conventional absorptionrefrigeration cycle. In this study, the effect of changingvarious parameters on the coefficient of performance,exergetic efficiency, irreversibility of component andcrystallization is analyzed.The results reveal that first and second lawefficiencies of absorption-recompression cycle at lowgenerator temperatures are higher than the absorptioncycle. With higher pressure ratio (۱.۸ in present studywith assumed operating conditions) absorptionrecompressioncycle start to operate at lower generatortemperatures. This means this cycle can utilize lowtemperature heat sources (waste heat, solar andgeothermal energies and etc) better than absorption cycle.In the absorption-recompression cycle, with increasingthe pressure ratio crystallization can occur at lowergenerator temperatures, but, since at high temperature thefirst and second law efficiencies are low, this cycle won'tbe used at those conditions.Also, the results show that maximum exergydestruction at high generator temperatures in both cycleoccurs in generator and the absorber, but at low generatortemperatures irreversibility of solution heat exchanger isconsiderably large.

کلیدواژه ها:

exergy ، energy ، crystallization ، absorptionrecompression ، LiBr-water