6 Using the product
46
• Globe temperature in °C = t
g
• Ambient temperature in °C = t
a
• Air speed in m/s = v
a
tr = [(tg+273)4+2.5*108*va0.6*(tg-ta)]1/4-273
Factors to be entered
• Clothing
Clothing reduces body heat losses and is therefore classified
based on its insulating value.
The insulating effect of clothing is given in the unit clo or m²
°K/W (1 clo = 0.155 m² °K/W).
The clo value can be calculated by adding together the values
of the individual items of clothing.
Insulating values for individual items of clothing can be found in
ISO 7730.
Alternatively, a clo range can be selected.
• Activity
The metabolic rate gives the energy released by oxidation
processes in the human body, and depends on muscle activity.
The metabolic rate is given in met or W/m
2
(1 met = 58.2 W/m²
body surface area). The average adult has a body surface area
of 1.7 m². In a state of thermal comfort, a person with a
metabolic rate of 1 met has heat loss of approx. 100 W.
When calculating the metabolic rate, a mean value of the
activity of the relevant person affected within the past hour must
be used. Met values for various activities can also be found in
ISO 7730.
Input parameters for clothing
Parameter
in clo
Parameter in
m2K/W
Explanation
0 – 0.02 No clothing
0.03 – 0.29 0.005 – 0.045 Underwear
0.30 – 0.49 0.046 – 0.077 Shorts and T-shirt
0.50 – 0.79 0.078 – 0.122 Trousers and T-shirt
0.80 – 1.29 0.123 – 0.200 Light business wear
1.30 – 1.79 0.201 – 0.277 Warm business wear
1.80 – 2.29 0.278 – 0.355 Jacket or coat
2.30 – 2.79 0.356 – 0.432 Warm winter clothing
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