有限热容不可逆四热源吸收式制冷机的优化

将吸收式制冷机视为由不可逆卡诺热机驱动不可逆卡诺制冷机的联合循环系统,应用有限时间热力学理论建立了既考虑内、外不可逆性影响,又考虑有限热容影响的、更接近于实际系统的热力学模型。引入两个内不可逆性参数,分别用于描述热机循环的内不可逆性和制冷循环的内不可逆性。利用所建模型,由拉格朗日乘数法推导出吸收式制冷机的基本优化关系、相应的优化设计条件以及工质的最优工作温度。还利用这些关系式进行了一些分析和讨论,得到了一些有益于实际吸收式制冷机优化设计与改进的简化关系式和重要结论。

Optimization of irreversible four-heat-source absorption refrigerator with finite heat capacity

A model for the absorption refrigerator treated as an irreversible Carnot refrigerator driven by an irreversible Carnot heat engine was established using the finite-time thermodynamic approach.Considering not only the effects of the external and internal irreversibilities but also the effect of the finite heat capacity,the established model is a general thermodynamic model that is close to the real systems.Two internal irreversibility parameters,the heat engine cycle and the refrigerator cycle were introduced to characterize the irreversibility inside the cycle.Using the established mode a basic optimization relationship of the absorption refrigerator and corresponding conditions for the optimal design and the the optimal working temperature of the working fluid in the heat exchanger were derived by the Lagrangian multiplier method.Some simplified relationships for the optimal design and the improvement of the actual absorption refrigerator were also deduced.