应用于超低温区二元复叠制冷系统热力学性能分析  

Thermodynamic performance analysis of a cascade refrigeration system in ultra-low temperature

作　　者：严玉琴 冶文莲 王伟杰 刘发柱 杨鹏 刘迎文[2] Yan Yuqin;Ye Wenlian;Wang Weijie;Liu Fazhu;Yang Peng;Liu Yingwen(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]兰州理工大学能源与动力工程学院,兰州730050 [2]西安交通大学能源与动力工程学院,西安710049

出　　处：《低温与超导》2023年第9期53-58,共6页Cryogenics and Superconductivity

基　　金：国家自然科学基金(52106027)资助。

摘　　要：本文以超低温区的R290/R170复叠制冷系统为对象,利用Aspen Hysys建立其理论模型,通过改变系统的各运行工况研究得出系统的COP、质量流量比m_(L)/m_(H)、低温级压缩机排气温度等参数的变化规律。结果表明:系统COP、质量流量比随低温级蒸发温度、冷凝器出口工质过冷度的升高而升高,随高温级冷凝温度、低温级工质过冷度、复叠温差的升高而降低。在满足超低温要求的前提下,复叠温差对系统性能的影响最为显著。R290/R170 cascade refrigeration system in the ultra-low temperature was taken as the object,and its theoreti⁃cal model was established by using Aspen Hysys.By changing the operating conditions of the system,the changing rules of sys⁃tem parameters such as COP and mass flow ratio were obtained.The results show that the COP and mass flow ratio m_(L)/m_(H)of the system increase with the increase of the evaporation temperature and the supercooling degree of the working medium at the con⁃denser outlet,but decrease with the increase of the condensing temperature at the high temperature,the supercooling degree of the working medium at the low temperature and the cascade temperature difference.On the premise of meeting the requirement of ultra-low temperature,the cascading temperature difference has the most significant effect on the system performance.

关 键 词：复叠制冷 质量流量比 排气温度 低温冰箱 R290/R170 

分 类 号：TB657[一般工业技术—制冷工程]