Part B: Revisions to the COMFA outdoor thermal comfort model for application to subjects performing physical activity |
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| Authors: | Natasha A Kenny Jon S Warland Robert D Brown Terry G Gillespie |
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| Institution: | (1) Teaching Support Services, University of Guelph, Guelph, ON, Canada;(2) Department of Land Resource Science, University of Guelph, Guelph, ON, Canada;(3) School of Environmental Design and Rural Development, University of Guelph, Guelph, ON, Canada |
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| Abstract: | This study assessed the performance of the COMFA outdoor thermal comfort model on subjects performing moderate to vigorous
physical activity. Field tests were conducted on 27 subjects performing 30 min of steady-state activity (walking, running,
and cycling) in an outdoor environment. The predicted COMFA budgets were compared to the actual thermal sensation (ATS) votes
provided by participants during each 5-min interval. The results revealed a normal distribution in the subjects’ ATS votes,
with 82% of votes received in categories 0 (neutral) to +2 (warm). The ATS votes were significantly dependent upon sex, air
temperature, short and long-wave radiation, wind speed, and metabolic activity rate. There was a significant positive correlation
between the ATS and predicted budgets (Spearman’s rho = 0.574, P < 0.01). However, the predicted budgets did not display a normal distribution, and the model produced erroneous estimates
of the heat and moisture exchange between the human body and the ambient environment in 6% of the cases. |
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