Neon, thermodynamic data

The most complete tabulation of thermodynamic data available for neon is given in a paper by Yendall [1]. In this paper, Yendall used the 102 experimental PVT observations of the Leiden Laboratory [2] made between 1915 and 1919 to compute an equation of state. This equation of state was a modification of the Beattie-Bridgeman and Benedict-Webb-Rubin equations and used twelve coefficients. 

The T-S diagram appearing in Figs. 1 and 2 represents in the opinion of the authors the best thermodynamic data of neon which is available in the literature. However, those using this T-S diagram are reminded to use caution with the values above 80 atm since these points are calculated only from an equation of state with no experimental justification. Consequently this chart should be regarded as preliminary in nature, subject to revision when new and additional data become available. 

There are presently several database programs of thermodynamic properties data developed specifically for fluids commonly associated with low temperature processing including helium, hydrogen, neon. 

The values in these tables were generated from the NIST REFPROP software (Lemmon, E. W, McLinden, M. O., and Huber, M. L., NIST Standard Reference Database 23 Reference Fluid Thermodynamic and Transport Properties—REFPROP, National Institute of Standards and Technology, Standard Reference Data Program, Gaithersburg, Md., 2002, Version 7.1). The primary source for the thermodynamic properties is Katti, R. S., Jacobsen, R. T, Stewart, R. B., and Jahangiri, M., Thermodynamic Properties for Neon for Temperatures from the Triple Point to 700 K at Pressures to 700 MPa, Adv. Cryo. Eng. 31 1189-1197,1986. Validated equations for the viscosity and thermal conductivity are not currently available for this fluid. 

With the exception of the new data on parahydrogen, the definition of the various P-V-T surfaces appears meager, and for neon and carbon monoxide these surfaces are almost undefined. This is clearly demonstrated when a comparison of the experimental pressure and temperature data is made with the broad ranges of pressure and temperature for which thermodynamic properties have been tabulated. 

Tables of the thermodynamic properties of neon have been computed using an electronic digital computer. An equation of state with 12 constants was fitted to PVT data for neon. The 102 points measured at Leiden were used because they lie in the temperature region of interest, The form of the equation was chosen to allow evaluation of the constants directly from the data using the method of least squares.

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