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Helmet Exhalation Capture System (HECS) Sizing Evaluation for an Advanced Space Suit Portable Life Support System
Technical Paper
2008-01-2117
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
As 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, passes over the astronaut's body, and is 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.
Authors
Citation
Paul, H., Waguespack, G., Conger, B., and Paul, T., "Helmet Exhalation Capture System (HECS) Sizing Evaluation for an Advanced Space Suit Portable Life Support System," SAE Technical Paper 2008-01-2117, 2008, https://doi.org/10.4271/2008-01-2117.Also In
References
- Bailey, Paul “Constellation Suit Element Portable Life Support System (PLSS) Schematic Selection Study,” NASA February 2007
- Gilbert, John Schentrup Susan “Determination of Residual Carbon Dioxide During Forced Ventilation of a Hemispherical Space Suit Helmet - Final Test Report,” NASA/JSC January 31 1991
- “Air Bearing Fan - Final Test Report,” Crew and Thermal Systems Division NASA-Lyndon B. Johnson Space Center Houston, TX December 31 1992
- Gilbert J. Schentrup S. “Determination of Residual Carbon Dioxide During Forced Ventilation of a Hemispherical Space Suit Helmet” Final Test Report 31 January 1991
- Bue, Grant Computer Program Documentation 41-Node Transient Metabolic Man Program Lockheed Engineering and Sciences Company, Inc. October 1989
- Avallone, Eugene A. Baumeister Theodore III Mark's Standard Handbook for Mechanical Engineers 9th 14 54 McGraw Hill New York 1986
- Space Shuttle Extravehicular Mobility Unit Space Suit Assembly (SSA) Mini-Databook 127
- Fox, Robert W. McDonald Alan T. Introduction to Fluid Mechanics 3rd John Wiley and Sons New York 1985
- Webb, P. Bioastronautics Data Book NASA 1964
- Conger, B. C. et. al. “Life Support Commonality across the Lunar Sortie Architecture,” Jacobs ESCG/NASA May 2006
- Papale, William Paul Heather L. “Development status of an EVA-sized cycling amine bed system for spacesuit carbon dioxide and humidity removal,” International Conference on Environmental Systems, SAE Paper No. 2007-01-3272 July 2007
- 2007
- Thomas, Gretchen A. “Packaging Factors for Portable Life Support Subsystems Based on Apollo and Shuttle Systems.” International Conference on Environmental Systems, SAE Paper No. 932182 July 1993
- Campbell, Colin August 30 2007