Accession Number : AD0774682

Title :   Effect of Substituting Hydrogen for Helium on Human Thermal Exchange in Hyperbaric Environments.

Descriptive Note : Final rept. Jul 72-Jan 74,

Corporate Author : WESTINGHOUSE ELECTRIC CORP ANNAPOLIS MD OCEAN RESEARCH AND ENGINEERING CENTER

Personal Author(s) : Smith,N. Eugene

Report Date : JAN 1974

Pagination or Media Count : 30

Abstract : The substitution of hydrogen for helium as an inert gas in hyperbaric environments was examined for its impact on human thermal exchange at depths between 10 and 100 atmospheres. Based on present data the theoretical ambient temperature required for thermal balance does not differ significantly between hydrogen-oxygen and helium-oxygen mixtures in a dry environment. A diver in cold water will experience a respiratory heat loss approximately one-third greater breathing hydrogen-oxygen, and his inspiration temperature must be adjusted accordingly. This investigation revealed a definite lack of experimental data on transport or thermophysical properties of gas mixtures involving helium and/or hydrogen at pressures to 100 atmospheres. (Author)

Descriptors :   *Body temperature, *Hyperbaric conditions, *Helium, *Hydrogen, Rare gases, Respiration, Stress(Physiology), Humans, Skin(Anatomy), Homeostasis, Underwater, Low temperature, Diving, Thermophysical properties

Subject Categories : Stress Physiology
      Life Support Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE