换热器的(火积)理论强化传热评价准则研究  

Research on the Heat Transfer Enhancement Evaluation Criterion of Heat Exchanger Based on Entransy Theory

作　　者：王斯民[1] 王萌萌[1] 顾昕[1] 简冠平[1] 文键[2] 

机构地区：[1]西安交通大学化学工程与技术学院,西安710049 [2]西安交通大学能源与动力工程学院,西安710049

出　　处：《西安交通大学学报》2016年第1期1-7,15,共8页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(5110611981100707);教育部高等学校博士学科点专项科研基金资助项目(20110201120052);中央高校基本科研业务费专项基金资助项目

摘　　要：对于现有的(火积)理论只考虑了换热器换热量或传热温差的影响,而没有考虑压降和泵功的问题,分析和推导得出两种新的(火积)评价指标ET/EP2/3和ET/EP,并命名为EPEC(entransy performance evaluation criterion)指标,分别表征了单位压降和单位泵功下的换热量,这对换热器传热强化性能评价工作具有重要的参考价值。同时,对18°和27°平面螺旋折流板换热器和折面螺旋折流板换热器的实验结果分别进行了基于热力学第一定律、热力学第二定律以及新的(火积)理论评价指标的分析,研究表明:ET/EP2/3和ET/EP与单位压降和单位泵功下的换热量随有效度的变化趋势基本一致,验证了新评价指标的有效性和可靠性。不同评价指标均从不同方面反映了换热器的性能,同时也说明了不同评价指标之间的差异和针对不同换热器不同工况统一标准的必要性。In consideration of the fact that present entransy theory only paid attention to the influence of heat exchange amount or heat transfer temperature difference,without taking into account the pressure drop and pump power,we analyzed and derived two entransy evaluation criteria EPEC（entransy performance evaluation criterion）related to heat transfer entransy dissipation and resistance entransy dissipation,which represent the heat transfer capacities under unit pressure drop and pump power,respectively.These two evaluation criteria have important reference value to the performance evaluation of enhanced heat transfer.In addition,this paper also analyzed the experimental results of the 18° and 27°plane helical baffle heat exchanger and folding helical baffle heat exchanger based on the first and second laws of thermodynamics and the new entransy evaluation indicators.The results show that the changing tendencies of ET/EP2/3 and ET/EPwith the effective degree are in good agreement with that of the heat transfer under unit pressure drop and pump power,verifying the validity and reliability of the new evaluation indicators.Different evaluation indicators reflect the performance of heat exchanger in differentways,which also illustrate the difference between different evaluation criteria and the necessity to unify the evaluation criteria for different heat exchangers under various working conditions.

关 键 词：螺旋折流板换热器 理论 评价准则 可靠性 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]