分析了火用的不等价性 ,在此基础上提出了火用弹性系数、初始火用损耗率等概念。以火用弹性系数为计算基础 ,分析了在单一系统内各组元火用效率对整个系统火用效率的影响 ,导出了初始火用损耗率的计算方法 ,并以实例进行了分析计算。分析表明 :系统内各组元的单位火用所消耗的初始火用更能反映系统各组元的火用耗特性 ,从而有利于更科学地分析系统各单元的节能潜力 The inequality of exergy is analyzed. On this basis, concepts such as exergy coefficient, initial exergy loss rate and so on are put forward. Based on the calculation of exergy coefficient of elasticity, the influence of the exergy efficiency of each component on the exergy efficiency of the whole system was analyzed. The calculation method of the initial exergy loss rate was derived and analyzed with examples. The analysis shows that the initial exergy consumed by the unit exergy of each component in the system can better reflect the exergy consumption characteristics of each component of the system and thus help to more scientifically analyze the energy saving potential of each unit of the system