Liquid Cooling and Ventilation Garment


Liquid Cooling and Ventilation Garment

A Liquid Cooling and Ventilation Garment, or LCVG, is a form-fitting garment worn by astronauts in order to maintain a comfortable core body temperature during extra-vehicular activity. The LCVG accomplishes this task by circulating cool water through a network of flexible tubes in direct contact with the astronaut's skin. The water draws heat away from the body, resulting in a lower core temperature. The water then returns to the Primary Life Support System, or PLSS, where it radiates heat into space, thereby cooling before being recirculated.

Because the space environment is essentially a vacuum, heat cannot be lost through heat conduction, and can only be dissipated through thermal radiation, a much slower process. Thus, even though the environment of space can be extremely cold, excessive heat build-up is inevitable. Without an LCVG, there would be no means by which to expel this heat, and it would affect not only EVA performance, but the health of the suit occupant as well. The LCVG used with the Apollo/Skylab A7L suit could remove heat at a rate of approximately 2000 Btu/h (600 watts). [cite book
last = Carson
first = Maurice A.
authorlink =
coauthors = Rouen, Michael N., Lutz, Charles C., and McBarron, James W. II
title = Biomedical Results of Apollo - Section VI - Chapter 6 - Extravehicular Mobility Unit
publisher = Lyndon B. Johnson Space Center
date =
location =
pages =
url = http://lsda.jsc.nasa.gov/books/apollo/S6CH6.htm
doi =
id =
]

The LCVG used with NASA's Extravehicular Mobility Unit is primarily constructed of spandex, with a nylon liner. [cite web
last = Freudenrich
first = Craig C.
title = How Spacesuits Work
work = How Stuff Works
url = http://www.howstuffworks.com/space-suit4.htm
accessdate = 2007-01-18
] The tubes are polyvinyl chloride.

A Liquid Cooling and Ventilation Garment is differentiated from a Liquid Cooling Garment by the presence of ventilation ducts, which draw exhaled gas from the suit's extremities and return it to the Primary Life Support System.

References

External links

* [http://paperairplane.mit.edu/16.423J/Space/SBE/eva/EVA/images/lcvg.jpgPicture of an LCVG]
* [http://quest.nasa.gov/space/teachers/suited/5emu2.html List of EMU components - NASA Quest]


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