关键词: 数值分析, 换热, 耗散数, 板式换热器, 温差场

Abstract: For multi-media plate exchangers, compact is one of the important features, so, which can be used widely in the fields of waste heat recovery or heating system. But, the fluid channel arrangements are numerous and varied in the case of the channel number increasing, and the performance of multi-media plate exchangers will change in a wide range. The flowing and heat exchanging characteristics become more complex than two-fluid heat exchangers. Actually optimization of fluid channel arrangement can improve the performance of multi-media exchangers in the same initial conditions. The numerical method was utilized in this paper to analyze the influence of different fluids channel arrangements on the performance of a novel multi-media plate exchanger. And the entransy dissipation number was used as the objective function. Choose 26 kinds of arrangement in the range of 3-6 fluid channels. Correspondingly the entransy dissipation number and flow pressure loss of the novel multi-media plate exchanger were calculated. Under the same initial conditions, the conclusion showed that the total pressure loss reduced step by step with the fluid channel number increasing. In the case of same fluid channel number, different arrangements had very large impact on the value of entransy dissipation number of the plate exchanger. The value of the minimum entransy dissipation number with the same channel number will reduce with the channel number increasing. And also, the regular methods for channels arrangement to reduce the irreversible loss were summarized in this paper, which could provide some references for performance optimization of the multi-media plate exchanger.

Key words: numerical analysis, heat transfer, entransy dissipation number, plate exchanger, temperature difference field