换热过程是发生于热设备中的极为普遍的现象。无论是在能源系统,动力、化工和冶金工业中甚至宇航业中,换热器和涉及换热过程的设备都有着广泛的应用且占有重要的地位。而换热过程的效率是评价换热设备的重要技术经济指标,一个热设备的热能利用合理与否往往决定于其换热过程效率的高 Heat exchange is a very common phenomenon that occurs in thermal equipment. Whether in the energy system, power, chemical and metallurgical industries or even in the aerospace industry, heat exchangers and equipment involved in the heat exchange process have a wide range of applications and occupies an important position. The efficiency of the heat transfer process is an important technical and economic index to evaluate the heat exchange equipment. Whether a heat equipment is reasonable or not depends on the efficiency of the heat exchange process