基于对比态温度的制冷循环热力解析及性能分析  

Thermodynamic Analysis and Performance Analysis of Refrigeration Cycle Based on Reduced Temperature

作　　者：胡立凯 王永真 尹洪梅 陈桂兵 安青松[1] 赵军[1] HU Li-Kai;WANG Yong-Zhen;YIN Hong-Mei;CHEN Gui-Bing;AN Qing-Song;ZHAO Jun(Key Laboratory of High Efficiency Utilization of Medium and Low Temperature Thermal Energy,Ministry of Education(Tianjin University),Tianjin 300350,China;Department of Electrical Engineering,Energy Internet Research Institute,(Tsinghua University),Being 100084,China)

机构地区：[1]中低温热能高效利用教育部重点实验室(天津大学),天津300350 [2]能源互联网创新研究院(清华大学电机系),北京100084

出　　处：《工程热物理学报》2020年第5期1065-1072,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51406212)。

摘　　要：制冷剂、工况及循环过程决定了蒸气压缩制冷循环的热力性能,为表征循环内部变量间的耦合关系,本文基于蒸气压缩制冷循环的热力学解析方法,建立了对比态温度下制冷剂关键物性及工况与循环性能的关系式:COP=f(C′p,w,Tcri,Teva,Tcon)。并结合传统数值模拟方法(调用NIST数据库中典型制冷剂的关键物性参数,计算制冷循环的理论性能系数),发现:1)制冷循环COP的主要影响因素除温度参数外,比定压热容和偏心因子是两个关键物性;2)过冷度比过热度对循环COP的影响更为强烈,且影响规律近似为线性关系;3)在相同对比态蒸发温度和对比态冷凝温度下,不同制冷剂的循环COP近似相等。本文热力解析模型及其结论对于制冷循环中制冷剂设计以及提高实际制冷循环性能系数具有一定的参考价值。Refrigerant,working conditions and cycle process determine the thermodynamic performance of vapor compression refrigeration cycle.In order to characterize the coupling relationship between the internal variables of the cycle,this paper establishes the relationship between the key physical properties of refrigerant,working conditions and cycle performance based on the thermodynamic analysis method of vapor compression refrigeration cycle:COP=f(C′p,w,Tcri,Teva,Tcon).Combining with the traditional numerical simulation method(calling the key physical parameters of typical refrigerants in NIST to calculate the theoretical performance coefficient of refrigeration cycle),it is found that:1)Besides temperature parameters,the main influencing factors of COP in refrigeration cycle are specific heat at constant pressure and acentric factor;2)In refrigeration cycle,the influence of supercooling degree on COP is stronger than that of superheating degree,and the influence law is approximately linear law;3)At the same reduced temperature of evaporation and condensation,the COP of different refrigerants is approximately equal.The thermodynamic analytical model and conclusions in this paper have certain reference value for refrigerant design of refrigeration cycle and improvement of performance coefficient of actual refrigeration cycle.

关 键 词：压缩制冷循环 性能系数 对比态温度 过冷度 过热度 

分 类 号：TB615[一般工业技术—制冷工程]