变温热源不可逆布雷顿制冷循环制冷率和制冷系数优化  

Optimization of cooling load and COP for an irreversible Brayton refrigerator with variable temperature heat reservoirs

作　　者：屠友明[1] 陈林根[1] 孙丰瑞[1] 

机构地区：[1]海军工程大学动力工程系,武汉430033

出　　处：《低温工程》2005年第3期16-22,共7页Cryogenics

基　　金：全国优秀博士学位论文作者专项奖金资助项目(200136);国家重点基础研究发展规划资助(973)项目(G2000026301)

摘　　要：用有限时间热力学方法分析变温热源不可逆简单布雷顿制冷循环的特性,分别以制冷率和制冷系数为优化目标,优化了循环中换热器的热导分配以及工质和热源间的热容率匹配,并采用数值计算分析了压比、换热器总热导、压缩机和膨胀机效率、工质热容率等参数对最优制冷率和制冷系数的影响特点。所得结果对工程制冷系统设计有一定的指导意义。The performance analysis of an irreversible Brayton refrigeration cycle with variable temperature heat reservoirs is carried out by using finite-time thermodynamic method.To maximize the cooling load and the coefficient of performance (COP) of the cycle, the allocation of a fixed total heat exchanger inventory and heat capacity rate matching between the working fluid and heat reservoirs are optimized, respectively. The influences of pressure ratio, the total heat exchanger inventory, the efficiencies of the compressor and expander, the heat capacity rate of the working fluid and the ratio of the heat capacity rate of heat reservoirs on the characteristic of the cycle are shown by detailed numerical examples. The results obtained may provide guidance for the design of the pratical air refrigeration plants.

关 键 词：不可逆布雷顿制冷循环 制冷率 制冷系数 优化 

分 类 号：TB61[一般工业技术—制冷工程]