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Meaningful wind chill indicators derived from heat transfer principles
Authors:Neima Brauner  M Shacham
Institution:(1) School of Engineering, Tel-Aviv University, 69978 Tel-Aviv, Israel;(2) Department of Chemical Engineering, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel
Abstract:The wind chill index (WCI) and the more widely used wind chill equivalent temperature represent an attempt to combine several weather-related variables (temperature, wind velocity and solar radiation) into a single index which can indicate human comfort. Since its introduction in 1945, the WCI has been criticized mainly on the ground that the underlying model does not comply with modern heat transfer theory. In spite of that, the WCI, ldquocalibratedrdquo to human comfort, has proven to be successful in predicting discomfort and tolerance of man to the cold. Nevertheless, neither the WCI nor the wind chill equivalent temperature can be actually measured and, therefore, without the additional lsquocalibrationrsquo they are meaningless. In this study we have shown that the WCI represents the instantaneous rate of heat loss from bare skin at the moment of exposure to the cold, and as such, it correlates reasonably well with measurable variables that represent a feeling of cold. Two new wind chill indicators have been introduced: exposed skin temperature and maximum exposure time. These indicators yield more information than the WCI provides, are measurable, have physical meaning and are based on established heat transfer principles.
Keywords:Wind chill index  Wind chill equivalent temperature  Exposed skin temperature  Maximum exposure time for bare skin  Tolerance of cold
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