对换热器热工计算中传热温差的计算方法进行了讨论、分析。经分析认为，在利用经验公式、传热方程和传热系数方程联立求解时，目前普遍采用的计算方法中隐含着传热温差计算方法的不一致，本文对由此而产生的误差大小及变化规律也进行了分析、计算，并对对数平均温差的适用范围进行了探讨 The calculation method of heat transfer temperature difference in thermal calculation of heat exchanger is discussed and analyzed. The analysis shows that when using the empirical formula, the equation of heat transfer and the equation of heat transfer coefficient are solved simultaneously, the commonly used calculation methods imply inconsistencies in the calculation methods of heat transfer temperature difference. In this paper, The law of variation is also analyzed and calculated, and the applicable range of logarithmic mean temperature difference is discussed