Heat gain in hyperbaric chambers may lead to hyperthermic fatalities. Several case reports were published, where chamber occupants died from heat stroke. In six out of eight cases, the vitims were recompressed on return from their dives in poorly cooled deck chambers in tropical climate latitudes. Recompression started at ambient tremperature. As pressure affects the heat conductivity of the breathing gas and grossly influences the effectiveness of the physiological modes of heat dissipation, chamber temperature as a function of pressure and pressure time course is crucial. The above mentioned factalities prompted the analysis of the thermodynamics of the chamber compression process. An analytical rexpression results, that describes how temperature change as a function of compression rate and final chamber pressure. The present law was tested in a hyperbaric chamber at various pressurisation rates and pressures. Conformity of the predicted temperatures and measured values was exceptionally good, with maximum deviations of less than 0.8 deg C. Chamber temperature can now be predicted from final pressure and compression speed, and thus may help to avoid the occurrence of heat stroke.
A thermodynamic analysis of chamber compression
Die thermodynamische Analyse von Druckkammer-Kompressionen
Ocean Engineering ; 22 , 4 ; 351-366
1995
16 Seiten, 3 Bilder, 1 Tabelle, 6 Quellen
Article (Journal)
English
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