【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。更多还原

【Abstract】 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 cliannel 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.更多还原