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煨耗散，将板翅式多股流换热器的煅耗散分为通道换热煅耗散和混合煨耗散两部分，定义了多股流换热器的煅耗散热阻。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煨耗散热阻一一对应，煅耗散热阻越小，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.
参考文献
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