Digital computer program develops temperature control system which maintains various subsystems within proper temperature limits. Coding is simple and input rules are easy to use and remember. Output format is easy to understand and to analyze for error diagnosis

Hultberg, J. A.

Obrien, P. F.

English

NASA Technical Reports Server

October 1971	 Brief 71-10386 
NASA TECH BRIEF 
NASA Pasadena Office 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the. Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Thermal Analysis System JAS- 1) Program 
The problem: 
To devise a computer program for the development 
of a temperature control system which would maintain 
various subsystems within the proper temperature 
limits. 
The solution: 
An easy-to-use digital computer program for ther- 
mal design analysis, which fills the gap between 
simple hand calculations and other computer pro-
grams that require complex user input. The program 
may be used whenever the problem or the time 
available does not justify or permit a more complex 
computer program. Or, it may serve as a stepping 
stone to complex thermal analyses.. Because the 
program is intended mainly as a design tool for the 
temperature control engineer, coding is simple and 
the input rules are easy to use and remember. The 
output format is easy to understand and to analyze 
for error diagnosis. 
How it's done: 
The Thermal Analysis System program (TAS-l) 
combines a thermal analysis program with subpro-
grams which compute the infrared conductance and 
the heat input due to solar heating. 
The spectral analysis formulation is developed 
for two regions: a solar region in which solar prop-
erties apply, and an infrared ,(1 R) region in which 
the IR properties apply. This separation is possible 
because there are two widely different temperature 
levels being considered: the high solar temperature, 
and the much lower spacecraft temperature. The solar 
region energy due to I R radiation is negligible in 
comparison with the solar energy itself. This widely
used assumption makes it possible to compute the 
heat inputs ill the solar region separately from the I R 
heat transfer. Thus, the heat inputs in the solar region 
are not a fu nction of the spacecraft tern perature. 
The problem solution is therefore reduced to that 
of. finding the spacecraft temperature distribution 
for a single vavleiigth region, without the iteration 
procedures that would be necessary for multiple 
regions. 
Notes: 
1. This program is written in FORTRAN IV and is 
operational on the IBM-7094, IBM-360/65, 
UNIVAC-1108 (EXEC 2), UNIVAC-l108 (EXEC 
8), and CDC-6400. The COSMIC version has 
executive control cards for operation on an 
IBM-7094, and these must be changed for use 
on the other machines. 
2. Requests for further information may be directed 
to:
COSMIC 
112 Barrow Hall 
University of Georgia 
Athens, Geor g ia 30601 
Reference: B71-10386 
Patent status: 
No patent action is contemplated by NASA. 
Source: Dr. J. A. Hultberg of

Caltech/JPL, and

P. F. O'Brien of

University of California

under contract to

NASA Pasadena Office

(NPO- l 1849)

Category 09 
This documeft 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.
https://ntrs.nasa.gov/search.jsp?R=19710000384 2020-03-17T02:28:56+00:00Z


Thermal analysis system /TAS-1/ program

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