多股流换热器的(火积)耗散热阻分析  

Analysis of Entransy-Dissipation-Based Thermal Resistance on Multi-Stream Heat Exchanger

作　　者：朱晓磊[1] 张勤[1] 孟继安[1] 李志信[1] 

机构地区：[1]热科学与动力工程教育部重点实验室,清华大学航天航空学院,北京100084

出　　处：《工程热物理学报》2012年第12期2140-2142,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金重点项目(No.51036003);国家"973"计划项目(No.2007CB206901)

摘　　要：在分析多股流换热器特点的基础上,考虑流体在通道出口非等温混合产生的(米积)耗散,将板翅式多股流换热器的(火积)耗散分为通道换热(火积)耗散和混合(米积)耗散两部分,定义了多股流换热器的(米积)耗散热阻。通过对不同通道排列下的多股流板翅式换热器的计算,发现多股流换热器换热量与其(米积)耗散热阻一一对应,(米积)耗散热阻越小,换热量越大。在对多股流板翅式换热器的通道进行排列时,应采用冷热通道间隔布置的形式,并使冷热通道的换热负荷相近。Based on the analysis of the feature of multi-stream heat exchanger, the entransy dissipation of plate-fin heat exchangers with multi-streams was divided into two parts： one from heat transfer between fluids and the other from fluids non-isothermal mixing at channel outlets, and the entransy-dissipation-based thermal resistance of multi-stream heat exchanger was defined. The numerical analysis of a multi-stream heat exchanger in different channel arrangements shows that the heat transfer rate corresponds to the entransy-dissipation-based thermal resistance one by one, the smaller the thermal resistance is, the larger the heat transfer rate will be. We concluded that the channel arrangement of a spacing layout of cold and hot fluid was considered in priority. In addition, the equal heat transfer load for each channel is better.

关 键 词：多股流换热器 煨耗散 热阻 通道排列 

分 类 号：TK264[动力工程及工程热物理—动力机械及工程]