CO_2跨临界循环与传统制冷循环的热力学分析

THERMODYNAMIC ANALYSIS FOR TRANSCRITICAL CO_2 CYCLE AND CONVENTIONAL REFRIGERATION CYCLE

以热力学第二定律和卡诺定理为基础,提出了一种新的热力学分析方法-当量温度法,并以此为基准对各种制冷循环进行了分析。与传统分析方法相比,当量温度法可以得出更加公正、合理的结论。

As the heat rejection process in transcritical CO2 cycle is under the supercritical region, the working fluid in the gas cooler performs heat transfer without phase change at constant pressure and variable temperature. It is impossible to analyze this cycle with the conventional analysis method, that is, based on the same evaporating temperature and condensing temperature, especially when comparing CO2 with traditional refrigerants, there is no unified standard. In addition, there are varied temperature-change processes in the practical refrigeration cycle, using conventional method to analyze these process often exists certain deviation. Therefore, based on the second law of thermodynamics and Camot＇ s theorem, a novel of thermodynamic analysis was presented-equivalent temperature. Compared to the conventional analysis method, it can obtain relatively fair and rational results.