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Temperature
C
Wet bulb
temperature
Dew point
Water vapor pressure
D
A
B
Saturated vapor pressure
FIGURE 9.1 Relationship between temperature, vapor pressure, dew point, and WBT. The dew point is the
009×001.eps
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(a) (b)
009×002.eps
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25
0
20
40
60
Work ability (%)
80
100
30 35
Temperature (°C)
40
500 W
400 W
300 W
200 W
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100
25
30
WBGT (°C)
35
32.2
31.4
30.6
30.0 29.4
31.1
30.0
27.9
25.9
25.0
26.7
28.0
d
c
b
a
200 300 400
Metabolic energy expenditure rates
kcal/h
Light
work
Moderate
work
Heavy
work
500
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Jan.
94
98
102
106
Mar. May
Temperature
Output
Relative output
July Sept. Nov. Jan.
17°
12°
Temperature
7°
2°
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060 120 180 240 300 360
26.7
Effective temperature
32.2
37.8
43.4
48.9
Exposure time (min)
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(a) (b)
FIGURE 9.7 Fresh drinking water should be readily available, clearly marked, and regularly replenished.
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