LED Helmet Extravehicular Activity Helmet Interchangeable Portable
(LEHIP) lights for the Extravehicular Mobility Unit (EMU) have been
built and tested and are currently being used on the International
Space Station. A design is presented of the passive thermal control
system consisting of a chamber filled with aluminum foam and wax. A
thermal math model of LEHIP was built and correlated by test to
show that the thermal design maintains electronic components within
hot and cold limits for a 7 hour spacewalk in the most extreme EVA
average environments, and do not pose a hazard to the crew or to
components of the EMU.
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