Abstract
Abstract A thermodynamic property formulation for air based upon new experimental P-ϱ-T, isochoric heat capacity and velocity of sound data has been developed. This model treats air as a pseudo-pure fluid for a wide-range of temperatures and pressures and provides for calculation of energy, heat capacity, entropy and velocity of sound in addition to pressure, density and temperature. This new formulation is valid for temperatures from 60 to 873 K at pressures to 70 MPa and is based on new measurements of the properties of liquid air recently completed at the National Institute of Standards and Technology (NIST) in Boulder, Colorado. The accuracies of properties calculated using the new thermodynamic property formulation are established by comparison to available experimental data.
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