双级压缩空气循环制冷系统的特性与优化研究

空气循环制冷由于其性能低下,影响了其在普通空调中的应用,如何提高空气循环制冷系统的性能一直是研究的焦点。本文主要针对双级压缩空气循环制冷系统的特性与优化进行了研究,分析了系统的流程,建立了热力学模型;结果表明:转动部件的等熵效率及换热器效率对循环特性有显著影响,实际循环中存在一最优膨胀比,其位置受转动部件等熵效率及换热器效率影响,附加回热器可以提高循环的性能,同时降低了最优压比。

Performance and Optimization Research for Two-stage Compression Air-cycle Refrigeration System

The performance of the air-cycle is so low that can not be used in refrigeration systems usually,so how to enhance its performance is the focus of the research. Here the performance and optimization research for two-stage compression air -cycle refrigeration system were carried on, the cycle process was analysised, and system thermodynamic models was established. The computation result shows that the isentropic efficiencies of the rotors and the efficiencies of heat exchangers are very important for the performance. There is an optimal pressure ratio for the actual cycle,its value is affected by the isentropic efficiencies of the rotors and the efficiencies of heat exchangers. When the regenerator is added, the performance of the cycle is enhanced and the value of the optimal pressure ratio is decreased.