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传热过程的热力学分析是传热过程优化中很有影响的一种方法,本文从热力学火用损的观点,对恒热流条件下流通截面积与流程之比对不同流量下单位传热量下的火用损的影响进行了研究,发现在取得最佳宽敞比时,比热火用损远大于比流火用损,对流换热过程的优化应以降低比热火用损为主。随着流量的增加,为取得火用损最小需要增加流通过程的径长比,这一调整措施与传热——流动阻力分析中得到的结论一致。
The thermodynamic analysis of the heat transfer process is a very influential method in the optimization of the heat transfer process. In this paper, from the point of view of thermoexponential loss, the ratio of the flow cross-sectional area to the flow rate under constant heat flux It is found that when the optimal ratio of spaciousness is obtained, the loss from heat application is greater than the loss from specific heat flow. The optimization of convection heat transfer process should be based on reducing the specific heat loss. With the increase of the flow rate, the diameter-length ratio of the circulation process needs to be increased to minimize the exergy loss. This adjustment measure is consistent with the conclusion obtained in the heat transfer-flow resistance analysis.