ISO 13579-4:2013规定了测量能量平衡和计算过程效率的一般方法，该过程涉及熔炉制造商设计的具有保护性或反应性气氛的熔炉。该通用方法包括测量方法、计算（通用计算）和评估报告。ISO 13579-4:2013的一部分不适用于在具有保护性或反应性气氛的熔炉外与工艺本身有关的任何效率。

ISO 13579-4:2013 specifies general methodology for measuring energy balance and calculating the efficiency of the process involving furnaces with protective or reactive atmosphere as designed by the furnace manufacturers. This general methodology includes measurement methods, calculations (general calculation), and evaluation report. part of ISO 13579-4:2013 is not applicable to any efficiencies related to the process itself outside of furnaces with protective or reactive atmosphere.