DYNAMIC HEAT AND MOISTURE TRANSFER THROUGH MULTIPLE CLOTHING LAYERS

1. The purposes of this study are to find out the arrangement effects on the vapor pressure gradient across the cotton-nylon double layer an d to elucidate changes in the vapor pressure gradient when an addition al third layer covers the double layer. 2. Model tests for single, dou ble and triple layer system and wear test for triple layer clothing we re conducted. 3. It was found that up to the second layer, dryness of innermost microclimate could be maintained when cotton faced the skin (C/N). 4. However, when mon permeable and hydrophobic third layer (UWF ) covers the double layer, the microclimate of C/N is no longer drier than N/C. 5. When nylon is exposed to the skin, a larger drop in vapor pressure across the first two layers occurred for bath model and wear test. 6. The innermost microclimate was not necessarily kept dry when the outermost layer dissipated more moisture due to the inefficient d istribution of moisture.