2007, Piran, Slovenia

Environmental Ergonomics XII
Igor B. Mekjavic, Stelios N. Kounalakis & Nigel A.S. Taylor (Eds.), © BIOMED, Ljubljana 2007
Mean skin temperature: Subjects’ mean skin temperature decreased within the first 10
minutes in both conditions (Figures 3 and 4). Thereafter mean skin temperature stabilised in
all trials with the exception of trial D3, where it continued to gradually decrease in the latter
half of the trial. Mean skin temperature decrement in simulations was generally faster and
greater in magnitude than observed, except in D10 simulations where the clothing insulation
was not corrected for wind and walking, and where it started sharply increasing after the
initial drop (Figures 4). In contrast, D3 simulations without wind correction remained closer
to the observed data (Figure 3). Assuming the wind and walking corrected insulation as true
values, then the differences between observed and predicted values may be due to an
overestimation of the ventilation in the thick winter clothes by the Fiala model, and/or an
underestimation of the thermal inertia of the clothing system.
518
Rectal temperature (°C)
Rectal temperature (°C)
38,5
38,3
38,1
37,9
37,7
37,5
37,3
37,1
36,9
36,7
D3 Subj D3 Dn D3 Un D3 Dw D3 Uw Figure 1. The subject
data and predicted
values of the rectal
temperature in 3 m/s
wind.
36,5
0 10 20 30 40 50 60 70 80 90 100
38,5
38,3
38,1
37,9
37,7
37,5
37,3
37,1
36,9
36,7
Time (min)
D10 Subj D10 Dn D10 Un D10 Uw D10 Dw
36,5
0 10 20 30 40 50 60 70 80 90 100
Time (min)
Figure 2. The subject
data and predicted
values of the rectal
temperature in 10 m/s
wind.