2007, Piran, Slovenia

Environmental Ergonomics XII
Igor B. Mekjavic, Stelios N. Kounalakis & Nigel A.S. Taylor (Eds.), © BIOMED, Ljubljana 2007
RESULTS
We estimated the distribution of water vapour within the PC system. In this estimation, the
composite vapour transfer resistances are assumed to be serial, because of the simple
geometry of the set-up. In this configuration, the water vapour does not evaporate from the
modelled skin, but from the underwear surface. Intrinsic water vapour resistances of the
underwear and the PCs can be predicted from a relation expressing the resistance, thickness,
and packing factor (Fukazawa et al., 2000). For external water vapour resistance from the PC
surface to the atmosphere, Reynolds-Colburn analogy can be applied based on the heat
transfer coefficient.
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Table 1 Properties of the protective and the underwear clothings under the solar radiation.
Thickness
(mm)
Weight
(gįm -2 )
Packing
factor
(%)
Thermal
conductivity
(Wįm -1 K -1 )
Emssivity
(-)
Reflectivity
(-)
Protective clothing Nomex
Orange 0.55 265 47.2 0.037 0.74 0.26
Black 0.55 265 47.2 0.029 0.77 0.23
Navy 0.55 265 47.2 0.035 0.73 0.27
Underwear
PP 1.13 176 17.1 0.038 Š Š
Figure 2. Profiles of the water vapour concentration and the temperature in the PC
system with the solar radiation.