A new fundamental equation explicit in Helmholtz energy for thermodynamic properties of nitrogen from the freezing line to 2000 K at pressures to 1000 MPa is presented. A new vapor pressure equation and equations for the saturated liquid and vapor densities as functions of temperature are also included. The techniques used for development of the fundamental equation are those reported in a companion paper for ethylene. The fundamental equation and the derivative functions for calculating internal energy, enthalpy, entropy, isochoric heat capacity (C v), isobaric heat capacity (C p), and velocity of sound are also included in that paper. The property formulation using the fundamental equation reported here may generally be used to calculate pressures and densities with an uncertainty of ±0.1%, heat capacities within ± 2%, and velocity of sound values within ±2%. The fundamental equation is not intended for use near the critical point.
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Jacobsen, R.T., Stewart, R.B. & Jahangiri, M. A thermodynamic property formulation for nitrogen from the freezing line to 2000 K at pressures to 1000 MPa. Int J Thermophys 7, 503–511 (1986). https://doi.org/10.1007/BF00502385
- equation of state
- saturation properties
- thermodynamic properties