自行复叠吸收制冷循环等效循环及性能优化

hermodynamic perfect degree is one of the main parameters of the evaluation on performances of refrigeration cycles, and it is based on the formula of for an ideal refrigeration cycle. For a class of new cycles - auto-cascade absorption refrigeration cycles, its equivalent cycle is modeled and thermodynamic processes of an equivalent reversible cycle are figured in T-s diagram. Based on the thermodynamic laws, formula of for reversible auto-cascade absorption refrigeration cycles is deduced in this context. Furthermore, on the basis of principle of minimization of entropy generation, thermodynamic perfect degree is applied to optimize irreversible auto-cascade absorption refrigeration cycles. Optimun cascade temperature and proportion coefficient of heat quantity distributed between heat source and heat source in auto-cascade processes are obtained for endoreversible auto-cascade absorption refrigeration cycles. Finally, optimun coefficient of performance and thermodynamic perfect degree have been achieved.