换热器在供热、空调、生活以及其它领域中大量应用，但在热工性能方面，如热效率、传热系数等方面，其计算方法如何正确表示，尚待进一步商榷。本文综合有关资料，对热效率的表示方式和传热系数的计算方法提出几点看法。 Heat exchangers are widely used in heating, air conditioning, living, and other fields. However, in terms of thermal performance, such as thermal efficiency, heat transfer coefficient, etc., how to correctly represent their calculation methods remains to be further discussed. This article, based on relevant data, puts forward some opinions on how to express thermal efficiency and how to calculate the heat transfer coefficient.