Vapour Transfer in 2-Layer Clothing Due to Diffusion and Ventilation (Damptransport door Diffusie en Ventilatie van 2-Lagen Kleding).dige
INSTITUTE FOR PERCEPTION RVO-TNO SOESTERBERG (NETHERLANDS)
Pagination or Media Count:
An experiment was carried out to measure the vapour resistance of 2- layer clothing ensembles as a function of air permeability of the outer layer, open or closed apertures, wind, and walking, both for the total ensemble and for the outer garment alone. Six subjects walked on a treadmill 0., 2.5, and 5 km h which was placed in a wind tunnel .2, .7, and 3.0 ms. They wore long underwear and an outer garment made of impermeable imp, microporous mpo, low air permeable loa, or high air permeable hai fabric. Vapour resistances were determined by a trace gas method which was calibrated against water vapour resistance. The vapour resistances of the underclothing and the outer garment were calculated and also the ventilation through the apertures. The vapour resistance of the underclothing was almost constant at 5 mm air equivalent. The ventilation was strongly dependent on wind and motion but still so low 54 1 min that only the impermeable garment could noticeably benefit from it.
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