Civil Engineering Reference
In-Depth Information
as a function of the predictive mean
vote (PMV) (International Standards
Organization, 1994).
that 90% of office users will like the climate. During the winter season this translates to
an indoor temperature of 20-24°C, and during the summer season to an indoor
temperature of 23-26°C. Both these temperature ranges assume sedentary activities,
common in an office environment. The reason for the lower temperature range during the
winter is that people wear thicker, more insulating clothes during the winter time. The
ISO 7730 points out that there is insufficient information available to establish comfort
limits for activities that are more physically demanding than seated office work
(International Standards Organization, 1994).
EXERCISE: DISCUSSION OF HEAT STRESS MANAGEMENT
Discuss the effect of each of the measures in Table 12.2. Analyze the effect of each
measure in the equation M−W=C+R+E.
Some of these measures may be practical for some environments but impractical in
other environments. Discuss each of the measures using the examples given at the end of
this chapter. What measures would be practical to reduce heat stress in the following:
1. An underground metal mine. This mine is very deep and the temperature is 90°F
(32°C), and the humidity is 99%.
2. An office at 90°F and a humidity of 50%.
3. An outdoor tennis game at 90°F and a humidity of 50%.
RECOMMENDED READINGS
A classic textbook in work physiology is Åstrand, P.-O., Rodahl, K., Dahl, H.A. and Stromme,
S.B., 2003,
Textbook of Work Physiology,
4th edition, Champaign, IL: Human Kinetics
Publisher. An excellent textbook for understanding human reactions to thermal environments is
Parsons, K.C., 2003,
Human Thermal Environments,
London: Taylor & Francis.
