换热器新评价标准——火积耗散均匀性系数  

New criteria for assessing heat exchanger performance-factor of equipartition of entransy dissipation

作　　者：郭春生[1] 程林[1] 杜文静[1] 

机构地区：[1]山东大学热科学与工程研究中心,济南250061

出　　处：《哈尔滨工业大学学报》2012年第3期144-148,共5页Journal of Harbin Institute of Technology

基　　金：国家重点基础研究发展规划资助项目(973-2007CB206900);国家自然基金青年科学基金资助项目(51106090)

摘　　要：定义了火积耗散均匀性系数,选用倾角β=30°～70°的复合人字形板式换热器为研究对象,利用三维CFD数值模拟软件ANSYS-CFX模拟分析换热器的火积耗散率、火用损失率以及系统火积耗散均匀性.结果表明:相同流量时,β=30°的复合人字形板式换热器的火用损失率最少;相同换热量时,β=30°的复合人字形板式换热器的火积耗散率最小;相同传热单元数与有效度时,β=30°的复合人字形板式换热器的火积耗散率最小且系统火积耗散均匀性最优.The factor of equipartition of entransy dissipation was defined at first,and then,applying three-dimensional CFD software-ANSYS CFX,the double chevron-type plate heat exchangers（DCPHE） were simulated,and the entransy loss rate,the exergy loss rate and the equipartition of entransy dissipation（EoED） of the working fluid in DCPHE with five corrugation angles were investigated.Results from numerical simulations showed that the exergy loss rate of the working fluid in DCPHE with β=30° were lower than those under same mass flow conditions;the entransy loss rate of the working fluid in DCPHE with β=30° were lower than those under same amount of heat conditions;the factor of EoED of the working fluid in DCPHE with β=30° were more than those under same number of transfer units（NTU） and effectiveness conditions.

关 键 词：换热器 火用损失率 火积耗散率 

分 类 号：TK124[动力工程及工程热物理—工程热物理]