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Related Experiment Videos

Clothing insulation in a hypobaric environment

S K Chang1, W R Santee

  • 1Biophysics and Biomedical Modeling Division, U.S. Army Research Institute of Environmental Medicine, Natick, MA 01760-5007, USA.

Aviation, Space, and Environmental Medicine
|September 1, 1996
PubMed
Summary
This summary is machine-generated.

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Hypobaria, or low pressure, slightly affects clothing insulation by enhancing evaporation and reducing convection. This results in lower skin temperatures but higher clothing temperatures at high altitudes.

Area of Science:

  • Physiology
  • Environmental Science
  • Textile Science

Background:

  • Clothing insulation relies on heat transfer mechanisms and material resistance.
  • Hypobaric conditions alter heat transfer, potentially impacting clothing's thermal properties.

Purpose of the Study:

  • To investigate the effects of hypobaria on the thermal insulation of military uniforms.
  • To quantify changes in heat transfer processes under simulated high-altitude conditions.

Main Methods:

  • Tested U.S. Army fatigue uniform (BDU) and chemical protective overgarment (BDO) in a hypobaric chamber.
  • Simulated an altitude of 4570 m (429 mmHg) and compared results to sea-level conditions.

Main Results:

  • Hypobaria diminished convective heat transfer and enhanced evaporative heat transfer.

Related Experiment Videos

  • Clothing insulation values were minimally affected; BDU insulation remained largely unchanged.
  • The more insulative BDO showed a maximum difference of 0.2 clo under hypobaric conditions.

    • Conclusions:

    • Evaporation dominated at the skin surface, while convection was key at the outer clothing surface.
    • Hypobaria led to lower skin temperatures due to enhanced evaporation.
    • Reduced convection at higher altitudes increased clothing temperature, hindering heat dissipation.