Advanced Liquid Cooling and Ventilation Garment Using Thermally Conductive Tubing



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49th International Conference on Environmental Systems


The Liquid Cooling and Ventilation Garment (LCVG) is a critical component of the space suit Portable Life Support System (PLSS). Improving the overall heat transfer coefficient (UA) of the LCVG without compromising astronaut comfort and mobility enables the PLSS to reject the increased heat of high metabolic rate extravehicular activities expected during future lunar or Martian missions. To achieve these goals, next-generation tubing has been developed that improves LCVG thermal performance by targeting tubing conduction and contact thermal resistance. Thermal and mechanical properties (thermal conductivity, density, flexibility, and hardness) and material compatibility with the PLSS water loop were evaluated for flexible, thermally-conductive polymers. Prototype tubing designs were rapidly iterated and tested by extruding tube segments of a thermally conductive, flexible material. Improved thermal performance of the prototype designs was experimentally demonstrated under representative operating conditions. Development of the advanced tubing is ongoing, with future efforts focused on the fabrication and testing of a full-scale LCVG.


Daniel Murphy, Mainstream Engineering Corporation, USA
Brian Tucker, Mainstream Engineering Corporation, USA
David Sykes, Mainstream Engineering Corporation, USA
ICES401: Extravehicular Activity: Systems
The 49th International Conference on Environmental Systems was held in Boston, Massachusetts, USA on 07 July 2019 through 11 July 2019.


Liquid Cooling and Ventilation Garment (LCVG), Portable Life Support System (PLSS), Thermally conductive tubing