Computer program subroutines provide the thermodynamic and transport properties of hydrogen in tabular form. The programs provide 18 combinations of input and output variables. This program is written in FORTRAN 4 for use on the IBM 7044 or CDC 3600 computers

Hall, W. J.

Mc Carty, R. D.

Roder, H. M.

English

NASA Technical Reports Server

May 1968	 Brief 68-10150 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Computer Programs for Thermodynamic and Transport Properties of Hydrogen 
The problem: 
The computations that generate thermodynamic 
and transport properties data through accurate 
formulas are very slow since the formulas are com-
plicated and require iterative solution. 
The solution: 
Computer program subroutines which provide the 
thermodynamic and transport properties of hydrogen 
in tabular form. 
How it's done: 
The thermodynamic and transport properties were 
first determined by experimental data and theory. In 
the program, these properties are presented in tables. 
The tabular intervals are varied to hold the accuracy 
of the interpolated values to an approximately con-
stant level. 
The range of the program is from I to 5,000 psia 
for temperatures from the triple point to 5,000°R or 
for enthalpies from —130 BTU/lb to 20,000 BTU/lb. 
The programs provide 18 combinations of input and 
output variables. Input variables are the pairs pres-
sure/temperature or pressure/enthalpy. Output vari-
ables are enthalpy or temperature, density, entropy, 
thermal conductivity, viscosity, velocity of sound, 
heat capacity at constant pressure, heat capacity at 
constant volume, and the heat capacity ratio.
Since these programs assume parahydrogen at low 
temperatures and conversion to the normal mixture 
through dissociation, it would not be proper to use 
these programs on a process which begins in the 
cryogenic range, goes to high temperature, and then is 
returned to the cryogenic range. 
Notes:	 - 
1. This program is written in Fortran IV for use on 
• the IBM 7044 or CDC 3600 computers. 
2. Tlis program will be useful to scientists and 
engineers involved in cryogenics research. 
3. Inquiries concerning this program may be made to: 
COSMIC 
Computer Center 
University of Georgia 
Athens, Georgia 30601 
Reference: B68-10150 
Patent status: 
No patent action is contemplated by AEC or 
NASA.
Source: W. J. Hall, R. D. McCarty,
and H. M. Roder
of the National Bureau of Standards 
under contract to

AEC—NASA Space Nuclear Propulsion Office

(NUC-10537) 
Category 06 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
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Computer programs for thermodynamic and transport properties of hydrogen

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