关于换热器热力学性能评价指标的分析与讨论

The Analysis and Discussion on Criteria for Evaluating Thermodynamic Performance of Heat Exchanger

在分析和讨论常见的换热器热力学性能评价指标———火用效率ηｅ和无因次熵产数Ｎｓ在实际应用时存在不足的基础上，引入了一个新的换热器热力学性能评价指标———无因次熵产率（火用损率）Ｎｅ，分析和讨论的结果表明，该指标不仅物理意义明确，而且适用范围更广，在换热器的热力学性能评价时优于火用效率ηｅ和无因次熵产数Ｎｓ．

Based on analyzing and discussing the limitation of common criteria——exergy efficiency and nondimensional entropy generation number applied in the field for evaluating thermodynamic performance of heat exchanger,a new criterion which is called nondimensional entropy generation rate(exergy loss rate) is introduced.The results show that the new criterion has more clear physical meaning,more extensive field of applications and is superior to exergy efficiency and nondimensional entropy generation number in evaluating the thermodynamic performance of heat exchanger.