2007, Piran, Slovenia

Modelling
Figure 1: Blood and mean skin temperatures during the exposure to dry hot environment: Ta= 40°C,
RH =20%; v=0.1m/s.
the model predicts attainment of steady state in 0.5 hrs after the onset of the exposure. Blood
temperature does not increase above 37°C, and the difference between blood and mean skin
temperature is 0.8°C. For a 2 hr exposure to a humid hot environment (Fig. 2; Ta=40°C, RH=
80%, and v= 0.1m/s) the model predicts that core and skin temperatures do not attain steady
state.
Figure 2. Blood and mean skin temperatures during the exposure to humid hot environment
(Ta=40°C, RH=80%, v=0.1m/s)
According to the model, it would be necessary to evaporate 350 kcal /h to maintain thermal
balance. However, the predicted E max in this environment is only 50kcal/h. By the end of
the exposure dripping sweat rate is 700g/h (Fig3).
g/h
Blood
mean skin
temperature
mean skin
dripping
sweat
blood
Figure 3. Dripping sweat rate during exposure to hot humid environment: (Ta= 40°C, RH=80%, v=
0.1m/s)
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