能量的交换与利用,应当从能量的“数量”和“质量”两个方面进行分析研究。作为能的“数量”和“质量”的综合指标,是对热力学体系进行热力学分析的基础之一。然而,水作为热力系统中应用最广泛的工质,其值的计算,尚有很多不清晰的地方。在IAPWS-IF97的基础上,对水和蒸汽值的计算方法进行了研究。编制了计算软件,实现了对水和蒸汽值的计算。 Energy exchange and utilization, should be from the energy “quantity ” and “quality ” two aspects of analysis and research. As a composite index of energy “quantity ” and “mass ”, it is one of the bases of the thermodynamic analysis of the thermodynamic system. However, water, as the most widely used refrigerant in thermal systems, has many ambiguities in the calculation of its value. On the basis of IAPWS-IF97, the calculation methods of water and steam were studied. Computational software was developed to enable the calculation of the water and steam levels.