Abstract: Heat exchanger design is one of the most important parts of process design and integration. The value of heat transfer temperature difference ΔT greatly affect the trade-off between investment and energy-saving, which deponds upon the ratio of energy price / equipment price. This paper studied and developed the thermal exergy pricing method and heat exchanger costing method according to exergo-economic theory. Based on these, futher developed the mathematical model of optimal temperature difference ΔTopt of heat transfer, as well as the cerresponding computer aided optimal design software. The application shows that the design which takes ΔTopt can result in much higher energy efficiency and economic benefits.

摘要： 换热器选型是化工过程设计工作的重要部分。换热器的传热温差ΔT设计取值，左右着一次投资与能量回收效率之间的优化权衡。其结果强烈取决于因资源有限性和制造科技进步所决定的、不断增加的能源与设备的比价。本文在运用火用 经济学理论对换热过程的热火用 损失计价和换热器投资估算方法进行深入的分析、探讨和回归的基础上，发展了换热器最优传热温差的数学模型，开发了可实用于工程设计的换热器ΔT计算机辅助优化计算软件。此项研究的应用实例表明，采用优化的换热器的传热温差ΔTopt的设计，能够取得显著的节能和经济效益。