湿空气热力性质计算方法: 173～647 K

为了在更大的温度、压力范围内准确计算热力循环的工质--湿空气的热力性质参数,采用维里状态方程的半经验模型建立湿空气热力性质参数的数学模型.计算方法融合了最新的研究进展,包括：维里系数计算方法,水蒸气饱和蒸气压最新计算式,国际水和水蒸气协会（IAPWS）发布的比焓、比熵和比体积等的计算方法,最新的干空气和水蒸气摩尔质量与气体常数等.阐明了173～647 K湿空气的热力性质计算方法,计算结果与文献［7,8,17,18］的研究结果比较可得,比焓的最大误差为1.10%,比熵的最大误差为3.5%,比体积的最大误差为1.89%.

Thermodynamic properties calculation method for moist air:173 to 647 K

A new method was proposed in order to precisely calculate the thermodynamic properties for moist air in wide range of temperature and pressure.The semiempirical model with Virial state equation was used to construct mathematical model of the thermodynamic properties of moist air.Calculation method included newest developments: latest research progress of Virial coefficients;up-to-date formulation of saturation pressure;recent formulation for specific enthalpy,specific entropy and specific volume of steam released by the International association for the properties of water and steam(IAPWS);current values for molar masses and gas constants.A new method was used to calculate the thermodynamic properties of moist air from 173 to 647 K.The results were compared with the data offered by reference [7,8,17,18].Maximum errors of specific enthalpy,specific entropy and specific volume were 1.10%,3.5% and 1.89%.