流道排列对多介质板式换热器性能的影响分析

Analysis for influence of channel arrangements on performance of multi-media plate exchangers

以■耗散数为目标函数,应用数值计算的方法分析了换热介质流道排列方式对板式换热器性能的影响。通过分析3~6个流道所包含的26种排列方式情况下的换热器耗散数及板间流动阻力损失变化,认为在相同的工况下,随着流道数量的增加,换热器总的压力损失呈阶梯降低的趋势;相同流道数情况下,冷热介质流道的排列形式对换热器耗散数影响较大;而相同的流道数量所对应的最小耗散数随流道数量的增加而降低,对多介质换热器性能的研究提供了一定的借鉴。

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 26kinds of arrangement in the range of 3—6fluid 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.