CLOTHING VENTILATION, VAPOR RESISTANCE AND PERMEABILITY INDEX - CHANGES DUE TO POSTURE, MOVEMENT AND WIND

被引:96
作者
HAVENITH, G
HEUS, R
LOTENS, WA
机构
[1] Thermal Physiology Research Group, TNO-Institute for Perception, Soesterberg, 3769 DE
关键词
Clothing ventilation; Convection; Diffusion; Microclimate; Vapour permeability;
D O I
10.1080/00140139008925308
中图分类号
T [工业技术];
学科分类号
08 [工学];
摘要
Using the trace gas diffusion method, the vapour resistance of three clothing ensembles (two permeable and one impermeable) was determined for four subjects, sitting, standing or walking at 0-3 and 09 m/s, combined with three wind speeds of <0-15, 0-7 and 41 m/s. Sitting increased vapour resistance by 12-36%, whereas walking and wind decreased the resistance by 72% and 89% when compared to standing with less than 0-15 m/s wind. Movement and wind interacted so that the higher the walking speed, the less additional effect of wind was observed.Values of the permeability index I m were calculated. Wind and movement increased I m up to a factor three for the permeable and up to a factor six for the impermeable garments. However, using a different definition of I m(I' m.), based on the convective part of the heat transfer coefficient only, resulted in higher I' m values (compared to i m) which remained constant with wind and movement. It was shown that with increasing wind and movement I m will increase and approach the value of. © 1990 Taylor & Francis Group, LLC.
引用
收藏
页码:989 / 1005
页数:17
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