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Determination of On-Orbit Cabin Air Loss from the International Space Station (ISS)The International Space Station (ISS) loses cabin atmosphere mass at some rate. Due to oxygen partial pressures fluctuations from metabolic usage, the total pressure is not a good data source for tracking total pressure loss. Using the nitrogen partial pressure is a good data source to determine the total on-orbit cabin atmosphere loss from the ISS, due to no nitrogen addition or losses. There are several important reasons to know the daily average cabin air loss of the ISS including logistics planning for nitrogen and oxygen. The total average daily cabin atmosphere loss was estimated from January 14 to April 9 of 2003. The total average daily cabin atmosphere loss includes structural leakages, Vozdukh losses, Carbon Dioxide Removal Assembly (CDRA) losses, and other component losses. The total average daily cabin atmosphere loss does not include mass lost during Extra-Vehicular Activities (EVAs), Progress dockings, Space Shuttle dockings, calibrations, or other specific one-time events.
Document ID
20050217416
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Williams, David E.
(NASA Johnson Space Center Houston, TX, United States)
Leonard, Daniel J.
(Boeing Co. United States)
Smith, Patrick J.
(Boeing Co. United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2004
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
SAE-2004-01 -2597
Meeting Information
Meeting: International Conference for Environmental Systems
Location: Colorado Springs, CO
Country: United States
Start Date: July 19, 2003
End Date: July 22, 2003
Sponsors: Society of Automotive Engineers, Inc.
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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