FLOW OF HEAT AND VAPOR THROUGH COMPOSITE PERM-SELECTIVE MEMBRANES UNDER SIMULATED CONDITIONS
Final rept. Jan 1967-Jan 1968
RHODE ISLAND UNIV KINGSTON
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An experimental study was made of the heat and mass water vapor flow rate through several different composite clothing systems. Cooling of a simulated skin surface was obtained through vaporization of water from a wet wick in the clothing system. Tests were conducted at both reduced and at atmospheric pressure. In the reduced pressure tests, cooling rates as high as 182 Btuhr. x sq.ft. were obtained with a simulated skin temperature of 91F. Excellent control of the simulated skin temperature at widely varying heat flow rates was possible. Temperature control was obtained by controlling the wick vaporization pressure. Both forced and natural convection were used in the atmospheric pressure tests. Forced convection was obtained by blowing air from a large fan across the surface of the clothing systems. The air velocity was approximately 7 ft.sec. While the heat flow rate depended somewhat upon the temperature and the humidity of the room air, which were not controlled in these tests, the results indicated that high cooling rates were possible. For a simulated skin temperature of 91F, cooling rates as high as 200 Btuhr. x sq. ft. for forced convection and 121 Btuhr. x sq. ft. for natural convection were obtained, with room air.
- Protective Equipment