Insulation system of test chamber will reach thermal equilibrium more quickly when it is gassy and least efficient than when evacuated and most efficient

Tysor, T. W.

English

NASA Technical Reports Server

May 1973	 B73-10163 
NASA TECH BRIEF 
•	 Marshall Space Flight Center 
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. 
Reduced Preparation Time for Thermal Vacuum Chamber Tests 
Preparation for tests in a thermal vacuum chamber 
may be considerably shortened if the required tempera-
ture condition is achieved before an attempt to reach 
the required vacuum condition. This is due to the fact 
that the insulation system of the test chamber will 
more quickly reach thermal equilibrium when it is 
gassy and least efficient than it will when evacuated 
and most efficient. Thermal flow rates should be cal-
culated for each test requirement to determine which 
approach will afford the greater savings in time and costs 
with least risk of damage to the test article.
Note: 
Requests for further information may be directed to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Code A&PS-TU 
Marshall Space Flight Center, Alabama 35812 
Reference: B73-10163 
Patent status: 
NASA has decided not to apply for a patent. 
Source: T. W. Tysor of 
Rockwell International Corp.

under contract to
Marshall Space Flight Center 
(MFS-24171) 
Category 03 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19730000163 2020-03-17T07:06:57+00:00Z


Reduced preparation time for thermal vacuum chamber tests

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