提高传热过程的性能是解决能源问题的重要途径之一.本文通过与力学中相关概念进行对比,分析了传热过程性能优化的新物理量——(火积)的宏观物理意义.通过(火积)与物体对外传热能力、(火积)定义的传热过程效率以及(火积)与热量传递驱动力的关系三方面分析,发现(火积)具有的宏观物理意义是物体包含的热量在温度场中所具有的势能.并且,通过对流换热的(火积)理论优化介绍了(火积)理论在工程实际中的应用. To improve the performance of the heat transfer process is one of the important ways to solve the energy problem.Through the comparison with the related concepts in mechanics, the macro physical meaning of the new physical quantity - (fire product) Product) and the heat transfer capacity of the object, the heat transfer process efficiency defined by (Fire Product), and the relationship between (Fire Product) and the driving force of heat transfer. It is found that the macroscopic physical meaning of (Fire Product) is the heat And the potential energy in the temperature field.And, the application of the theory of firefighting (FA) theory in engineering practice is introduced through the theory of (fire product) of convection heat transfer.