Versatile computer program analyzes environmental control and life support systems. The program permits changes of system component arrangements, component design details, and operating modes. It is written in FORTRAN language for use on the IBM 7094 computer

Vaughan, R. L.

English

NASA Technical Reports Server

November 1967
	
Brief 67-10415 
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 Program Analyzes Generalized Environmental Control and

Life Support Systems 
Analysis of environmental control and life support 
systems are often, of necessity, time consuming. To 
expedite these analyses through a computer program 
requires a program that easily permits changes of (1) 
system component arrangements, (2) component 
design details, and (3) operating modes (design condi-
tions, off-design conditions, failure conditions, etc.). 
The G-189 Generalized Environmental Control and 
Life Support System Program was written to accom-
plish these goals for a very wide range of systems. 
Two separate sets of program decks are available: 
one for computing steady-state performance only, and 
one for computing steady-state performance (initial 
conditions) followed by transient performance. 
The program's versatility results from its use of an 
analysis-controlling routine called the master control 
block. The master control block directs computations 
which are performed by a set of component subrou-
tines, and the master control block itself. 
Iterative methods of solution are employed by the 
program for component and system analyses. Calcu-
lated values of system variables are tested for con-
vergence against target values. These target values are 
indicated by (1) desired design conditions and (2)
computational convergence. When convergence is not 
attained the program reestimates the values of the 
variables that influence convergence of the tested 
variables and iterative computations are repeated. 
Notes: 
I. This program was written in Fortran IV lan-
guage for use on the IBM 7094 computer. 
2. Inquiries concerning this program may be di-
rected to:
COSMIC 
Computer Center 
University of Georgia 
Athens, Georgia 30601 
Reference: B67-10415 
Patent status: 
No patent action is contemplated by NASA. 
Source: Richard Leroy Vaughan 
of Douglas Aircraft Co. 
under contract to 
Manned Spacecraft Center 
(MSC-1 157) 
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 program analyzes generalized environmental control and life support systems

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