本文用热力学第一及第二定律分析对流换热过程中传热及流动两方面的性能,建立定量分析换热性能的(火用)损失率关系式,并利用它确定各种基本换热过程在给定条件下的最佳使用范围,以及比较各种换热方式的性能差异,为工程上采用换热过程提供综合性能评价的指标. In this paper, the first and second laws of thermodynamics are used to analyze the performance of heat transfer and flow in the convective heat transfer process. The quantitative relationship between the exergy loss rate and the basic heat transfer process The optimal range of use under given conditions, as well as the comparison of the performance differences of various heat exchange modes, providing an index for evaluating the overall performance of the project for the heat exchange process.