Experimental investigations of water evaporation from the free surface in the hyperbaric environment are reported. This study was undertaken to determine the coefficient of water evaporation #beta# as the function of the total pressure, temperature and the kind of gas. The experiments were carried out in the hyperbaric chamber in air within the total pressure range P chemical bounds 0.1 / 5MPa; the temperature range t chemical bounds 30 / 36 deg C and in helium and air-helium mixtures P chemical bounds 0.1 / 3MPa, t chemical bounds 26 deg C .Based on experimental values, an equation that describes a relationship between #beta# and the kind of gas at constant temperature was obtained; an additional equation that describes an effect of the total pressure and temperature on #beta# in air was derived. The results of the experiments demonstrated a large influence of the total pressure on #beta# , particularly within the total pressure range P chemical bounds 0.1 /2,5MPa for all kinds of gases used, a smaller effect of temperature being detected for air. The equations obtained are useful for the solution of the comfort equation derived for the hyperbaric environment because they make it possible when solved, to determine the heat loss by evaporation and rate of moisture transfer from wet surfaces of the hyperbaric chamber equipment. The results are presented in equations and graphs.
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