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Effect of environmental parameters on water vapor transfer of fabrics

The physical environmental parameters affecting water vapor transfer properties of fabrics include air temperature, relative humidity, and wind speed. The effects of air temperature, relative humidity, and wind speed on water vapor diffusion resistance have been investigated. The air temperatures varied from 10°C to 30°C in an interval of 5°C. The relative humidities ranged from 0% to 50%. The wind speed was from 0.1 m/s to 0.4 m/s. A new testing apparatus was utilized for evaluating the water vapor transfer properties of four typical fabrics exposed under 120 environmental conditions. The test results indicated that the water vapor diffusion resistances of four representative fabrics varied little with air temperatures. The microporous membrane laminated fabrics and air permeable fabrics showed a gradual increase in water vapor diffusion resistance with an increase in the relative humidity, whereas the water vapor diffusion resistance of hydrophilic membrane laminated fabrics and hybrid laminated fabrics were a function of relative humidity. These two types of fabrics exhibited low resistance to water vapor diffusion when the relative humidity was high. Finally, low wind speed resulted in high water vapor diffusion resistance of four typical fabrics.