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.
出处
《低温工程》
CAS
CSCD
北大核心
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)
关键词
不可逆布雷顿制冷循环
制冷率
制冷系数
优化
irreversible Brayton refrigeration cycle
cooling load
COP
optimization
