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根据热力学基本定律导出的一些热力学关系式,确定了各种热力学参数之间的普遍关联.只要知道了流体在理想气体状态下热容随温度的函数关系以及流体的状态方程,就能确定出该流体的内能、焓、熵、自由能、自由焓、(火用)以及逸度系数等热力学参数.此外,理想气体状态下的热容数据,还可用以反推分子结构与分子间相互作用的微观特性.因此,用实验方法确定工质在理想气体状态下的热容,对于流体工质热物性的研究具有十分重要的意义和作用.
Based on some thermodynamic relations derived from the basic laws of thermodynamics, the universal relationship among various thermodynamic parameters is determined, so long as the function of heat capacity with temperature and the equation of state of the fluid in an ideal gas state are known, Enthalpy, entropy, free energy, free enthalpy, exergy and fugacity coefficients, etc. In addition, the heat capacity data of the ideal gas state can also be used to reverse the molecular structure and intermolecular interactions Therefore, the experimental method to determine the heat capacity of the working fluid in the ideal gas state has great significance and research on the thermal properties of the fluid working fluid.