联合制冷循环的有限时间热力学

研究由两个内可逆卡诺制冷循环构成的无中间热源的联合制冷循环有限时间热力学最优性能。基于一类较为普遍的物理模型，导出其制冷量与制冷系数间的基本关系，再根据活塞式模型循环和定常流模型循环的基本特征，得到两种模型联合到冷循环的最佳制冷率密度与制冷系数间的关系。对前者，与前人所得结果相同；对后者，获得了一些新的有意义的结论。有关结果还可推广到由两个以上制冷循环构成的联合制令循环。

Finite-Time Thermodynamics for an Endoreversible-Combined Refrigeration Cycle

The finite-time thermodynamic optimal performance of a combi-ned refrigeration cycle is studied which is formed by two endoreversible Carnot refrigeration cycles in which there is without any intermediate heat reservoir.The fundamental relation between the quantity of refrigeration and the coefficient of performance of the combined cycle has been derived based on a general physical model combined cycle.Then the relation between the optimal specific rate of refrigeration and the coefficlent of performa-nce for the piston type model combined cycle and the stable flow model combined cycle have been derived according to the fundamental characters of the two model combined cycle. The results are the same as those in thecurrent literature for the piston type model and some new conclusions havebeen obtained for the stable flow model.The main results may be extendedto an endoreversible combined refrigeration cycle formed by some than twoendoreversible refrigeration cycle.