火积的宏观物理意义及其应用

摘要

It is an important approach to solve energy problem by improving performance of heat transfer process. The macro physical meaning of new physical quantity for heat transfer process optimization “entransy” is analyzed by comparing it with interrelated concepts in mechanics. From three aspects:the connection of entransy and the external heat transfer ability, efficiency of heat transfer process defined by entransy, and the relation of heat transfer driving force with entransy, the macro physical meaning of entransy is derived, which is the potential energy of heat in the temperature field. Moreover, the application of entransy theory in engineering is introduced through entransy theory optimization in convective heat transfer.%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。