不可逆三热源制冷机的有限时间热力学分析  

Finite-time Thermodynamic Analysis of an Irreversible Refrigerator With Three Heat Sources

作　　者：韩威[1] 张广军[2] 马迎秋 李忠建 陈建萍[5] 叶倩[5] 

机构地区：[1]天华建筑设计有限公司 [2]中国天辰工程有限公司 [3]上海燃气工程设计研究有限公司 [4]联合技术研究中心(中国)有限公司 [5]上海市建筑科学研究院

出　　处：《上海节能》2010年第10期25-28,共4页Shanghai Energy Saving

摘　　要：考虑到有限速率传热(外不可逆性)及工质内部耗散(内不可逆性)等不可逆因素的影响,建立了不可逆三热源制冷机的有限时间热力学模型。将该制冷机视为一个由不可逆卡诺热机驱动的不可逆卡诺制冷机的组合循环,通过优化热导率,导出了它的制冷率上界及相应性能系数的一般表达式,并探讨了内不可逆性对这两个性能参数的影响。所得结果为实际三热源制冷机的优化设计提供了新的理论依据。A model is presented for an irreversible three heat sources refrigerator using finite time thermodynamic approach, in which not only the irreversibility of finite-rate heat transfer （external irreversibility） but also the irreversibility of internal dissipations （internal irreversibility） of the working fluid are considered. The model is treated as a combined cycle of an irreversible Carnot heat engine driving an irreversible Carnot refrigerator. The general expressions of the maximum cooling rate and corresponding coefficient of performance are derived by optimizing the heat conductances. The effect of the internal irreversibility on these two performance parameters is discussed. The results obtained in this paper provide some new theoretical bases for the optimal design of the practical three heat sources refrigerator.

关 键 词：不可逆三热源制冷机 有限时间热力学 优化 制冷率上界 

分 类 号：TB651[一般工业技术—制冷工程]