Accession Number : AD0742080

Title :   A Study of Several Approaches for Supplying a Diver with Warm Breathing Gas.

Descriptive Note : Informal rept.,

Corporate Author : NAVAL COASTAL SYSTEMS LAB PANAMA CITY FLA

Personal Author(s) : Bentz,R. L.

Report Date : APR 1972

Pagination or Media Count : 60

Abstract : Recent investigations have shown that a diver working in cold water below 500 feet for extended periods of time must be provided with a warm breathing gas. Several practical approaches for supplying the diver with a warm breathing gas were investigated. The approaches investigated were influenced by their applicability to the U. S. Navy scuba Mark-11. This system uses warm water to heat the diver, and, therefore, is the only heat source considered. A thermal analysis of the Mark-11 yields theoretical temperatures throughout the system for helium-oxygen gas mixture at 1000 feet and for air at surface pressure. The same analysis is made considering insulated system components. The other approaches investigated were a heat exchanger, heated breathing hose, and a heated back pack. The advantages and disadvantages of each approach are discussed. (Author)

Descriptors :   (*GASES, *HEATING), (*BREATHING APPARATUS, DIVING), CARBON DIOXIDE, BODY TEMPERATURE, HEAT TRANSFER COEFFICIENTS

Subject Categories : Life Support Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE