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Helmet Exhalation Capture System (HECS) Sizing Evaluation for an Advanced Space Suit Portable Life Support SystemAs part of NASA s initiative to develop an advanced portable life support system (PLSS), a baseline schematic has been chosen that includes gaseous oxygen in a closed circuit ventilation configuration. Supply oxygen enters the suit at the back of the helmet and return gases pass over the astronaut s body to be extracted at the astronaut s wrists and ankles through the liquid cooling and ventilation garment (LCVG). The extracted gases are then treated using a rapid cycling amine (RCA) system for carbon dioxide and water removal and activated carbon for trace gas removal before being mixed with makeup oxygen and reintroduced into the helmet. Thermal control is provided by a suit water membrane evaporator (SWME). As an extension of the original schematic development, NASA evaluated several Helmet Exhalation Capture System (HECS) configurations as alternatives to the baseline. The HECS configurations incorporate the use of full contact masks or non-contact masks to reduce flow requirements within the PLSS ventilation subsystem. The primary scope of this study was to compare the alternatives based on mass and volume considerations; however other design issues were also briefly investigated. This paper summarizes the results of this sizing analysis task.
Document ID
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Paul, Heather L.
(NASA Johnson Space Center Houston, TX, United States)
Waguespack, Glenn M.
(GeoControl Systems, Inc. Houston, TX, United States)
Paul, Thomas H.
(Jacobs Technologies Engineering Science Contract Group Houston, TX, United States)
Conger, Bruce C.
(Hamilton Sundstrand Corp. Houston, TX, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2008
Subject Category
Man/System Technology And Life Support
Meeting Information
Meeting: International Conference on Environmental Systems
Location: San Francisco, CA
Country: United States
Start Date: June 29, 2008
End Date: July 3, 2008
Sponsors: Society of Automotive Engineers, Inc.
Funding Number(s)
WBS: WBS 903184.
Distribution Limits
Public Use Permitted.
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