Heat gain from thermal radiation through protective clothing with different insulation, reflectivity and vapour permeability.
The heat transferred through protective clothing under long wave radiation compared to a reference condition without radiant stress was determined in thermal manikin experiments. The influence of clothing insulation and reflectivity, and the interaction with wind and wet underclothing were considered. Garments with different outer materials and colours and additionally an aluminised reflective suit were combined with different number and types of dry and pre-wetted underwear layers. Under radiant stress, whole body heat loss decreased, i.e., heat gain occurred compared to the reference. This heat gain increased with radiation intensity, and decreased with air velocity and clothing insulation. Except for the reflective outer layer that showed only minimal heat gain over the whole range of radiation intensities, the influence of the outer garments' material and colour was small with dry clothing. Wetting the underclothing for simulating sweat accumulation, however, caused differing effects with higher heat gain in less permeable garments.
Bröde
Peter
P
Leibniz Research Centre for Working Environment and Human Factors (IfADo), Dortmund, Germany. broede@ifado.de
Kuklane
Kalev
K
Candas
Victor
V
Den Hartog
Emiel A
EA
Griefahn
Barbara
B
Holmér
Ingvar
I
Meinander
Harriet
H
Nocker
Wolfgang
W
Richards
Mark
M
Havenith
George
G
D006801:Humans; D008348:Manikins; D008422:Materials Testing; D010539:Permeability; D011481:Protective Clothing / Q000009:adverse effects*; D013814:Thermal Conductivity