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Management of the Post-Shuttle Extravehicular Mobility Unit (EMU) Water CircuitsThe EMU incorporates two separate water circuits for the rejection of metabolic heat from the astronaut and the cooling of electrical components. The first (the Transport Water Loop) circulates in a semi-closed-loop manner and absorbs heat into a Liquid Coolant and Ventilation Garment (LCVG) worn by the astronaut. The second (the Feed-water Loop) provides water to a cooling device (Sublimator) with a porous plate, and that water subsequently sublimates to space vacuum. The cooling effect from the sublimation of this water translates to a cooling of the LCVG water that circulates through the Sublimator. Efforts are underway to streamline the use of a water processing kit (ALCLR) that is being used to periodically clean and disinfect the Transport Loop Water. Those efforts include a fine tuning of the duty cycle based on a review of prior performance data as well as an assessment of a fixed installation of this kit into the EMU backpack, within on-orbit EMU interface hardware or as a stand-alone unit. Furthermore, testing is being conducted to ensure compatibility between the International Space Station (ISS) Water Processor Assembly (WPA) effluent and the EMU Sublimator as a prelude to using the WPA effluent as influent to the EMU Feed Water loop. This work is undertaken to reduce the crewtime and logistics burdens for the EMU, while ensuring the long-term health of the EMU water circuits for a 6-year service life.
Document ID
20120003778
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Steele, John W. (Hamilton Sundstrand Space Systems International, Inc. Windsor Locks, CT, United States)
Etter, David (Hamilton Sundstrand Space Systems International, Inc. Windsor Locks, CT, United States)
Rector, Tony (Hamilton Sundstrand Space Systems International, Inc. Windsor Locks, CT, United States)
Hill, Terry (NASA Johnson Space Center Houston, TX, United States)
Wells, Kevin (NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2012
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
JSC-CN-25921
Meeting Information
Meeting: International Conference on Environmental Systems
Location: San Diego, CA
Country: United States
Start Date: July 15, 2012
End Date: July 19, 2012
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 401769.06.06.01.02.07.01
Distribution Limits
Public
Copyright
Public Use Permitted.

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