New clothing resistance scheme for estimating outdoor environmental thermal load

Ferenc Ács; Erzsébet Kristóf; Annamária Zsákai

doi:10.5937/gp23-23717

Ferenc Ács Eötvös Loránd University, Department of Meteorology
Erzsébet Kristóf Eötvös Loránd University, Faculty of Science, Department of Meteorology, Pázmány Péter sétány 1/A., Budapest, Hungary and Eötvös Loránd University, Faculty of Science, Excellence Center, Brunszvik utca 2, Martonvásár, Hungary
Annamária Zsákai Eötvös Loránd University, Faculty of Science, Department of Human Anthropology, Pázmány Péter sétány 1/C., Budapest, Hungary

DOI: https://doi.org/10.5937/gp23-23717

Abstract

A new clothing resistance model for estimating outdoor thermal load is proposed and its behavior is analyzed in different weather conditions. It is based on clothed human body energy balance considerations; the human treated is a walking human in outdoor conditions. Weather and human data are taken from the internet site of the Hungarian Meteorological Service and from a Hungarian human dataset, respectively. Environmental thermal load is characterized in terms of clothing resistance r_cl and operative temperature. The model’s main strength is that it simulates metabolic rate M as simply as possible. r_cl deviations caused by personal variations of M are the largest in extreme cold and warm conditions, in the comfort zone this effect is non-essential. r_cl deviations caused by wind speed variations can be especially large in large heat excess cases. Further model tests are needed for more extreme conditions.

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