中文摘要：

提出一种传热消耗功率、热流量、传热单元数和传热有效度相结合的换热器优化设计新方法，以冷热流体的等效热力温度表征换热器传热消耗功率，在传热系数确定条件下，以传热有效度ε为共同变量，建立无量纲的对数温差、传热消耗功率ηu、传热单元数NTU与ε的关系，并在无量纲图ε-T，ε-△Tm，Ln，ε-ηu，ε-NTU表示它们之间关系，以ηu线与NTU线的交点确定传热有效度ε，优化参数能科学判断。本文对顺流和逆流换热器进行了分析，换热器的优化有效能率￡在0．75附近。本方法首次建立了换热器优化与热力学的联系。

英文摘要：

A new optimization method for heat exchanger design combined with heat transfer power consumption, heat flux, number of transfer units and heat transfer effectiveness was presented. In this method, the heat transfer power consumption is indicated by equivalent temperatures of hot/cold fluids, and the heat transfer effectiveness ε is regarded as a general variable parameter. The relationships between the dimensionless logarithmic mean temperature difference, the heat transfer power consumption r/u and the number of transfer units NTU with the heat transfer effectiveness ε are set up, which are shown in the dimensionless diagrams of ε -T, ε- △Tm,ε--ηu and e -NTU. The optimal heat transfer effectiveness e can be accurately obtained by the intersection point of curves of ηu and NTU, and evaluated about 0.75 from both of parallel flow and counterflow heat exchangers. The relation between the heat exchanger optimization and thermodynamics have been established for the first time in this paper.