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Advances in Meteorology
Volume 2013 (2013), Article ID 693541, 7 pages
http://dx.doi.org/10.1155/2013/693541
Research Article

Human Thermal Comfort and Heat Stress in an Outdoor Urban Arid Environment: A Case Study

1Department of Agricultural Engineering, College of Food and Agricultural Sciences, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia
2Mechanical Power Engineering Deptartment, Faculty of Energy Engineering, Aswan University, Aswan 81528, Egypt

Received 15 November 2012; Revised 19 January 2013; Accepted 19 January 2013

Academic Editor: Harry D. Kambezidis

Copyright © 2013 A. M. Abdel-Ghany et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

To protect humans from heat stress risks, thermal comfort and heat stress potential were evaluated under arid environment, which had never been made for such climate. The thermal indices THI, WBGT, PET, and UTCI were used to evaluate thermal comfort and heat stress. RayMan software model was used to estimate the PET, and the UTCI calculator was used for UTCI. Dry and wet bulb temperatures ( , ), natural wet bulb temperature ( ), and globe temperature ( ) were measured in a summer day to be used in the calculation. The results showed the following. (i) The thermal sensation and heat stress levels can be evaluated by either the PET or UTCI scales, and both are valid for extremely high temperature in the arid environment. (ii) In the comfort zone, around 75% of individuals would be satisfied with the surrounding environment and feel comfortable during the whole day. (iii) Persons are exposed to strong heat stress and would feel uncomfortable most of the daytime in summer. (iv) Heat fatigue is expected with prolonged exposure to sun light and activity. (v) During the daytime, humans should schedule their activities according to the highest permissible values of the WBGT to avoid thermal shock.