期刊
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
卷 216, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jweia.2021.104714
关键词
Wind; Turbulence intensity; Human subject experiment; Outdoor thermal comfort; Urban microclimate
资金
- School of Architecture, Design and Planning at The University of Sydney
- School of Civil Engineering at The University of Sydney
This research aims to investigate the impact of wind flow turbulence on thermal perception under outdoor conditions. The study found that increased turbulence intensity enhances perceived coolness by reducing skin temperature. By updating numerical models, the effects of turbulence intensity on skin temperature were accurately reflected, correcting previous underestimations.
Ongoing urbanization has led to complexities in the urban terrain, increasing roughness length within the atmospheric surface layer, and introduced highly turbulent wind flow at pedestrian height. This research aims to explicitly examine the effect of wind flow turbulence on thermal perception under outdoor conditions. A wind tunnel with passive grid was used to introduce turbulence into simulated wind conditions. Thermal physiological (skin temperature) and perceptual (questionnaire) responses were collected from 20 college-age subjects during the exposures to various simulated urban wind conditions. Results confirm that increased turbulence intensity enhances perceived coolness by reducing the skin temperature. We updated the convective heat transfer coefficient in a numerical skin thermoreceptor model and also Gagge's two-node thermophysiological model so that they both reflect more accurately the effects of turbulence intensity on skin temperature. Skin temperatures simulated with the modified models were in good agreement with experimental observations, and corrected the un-modified model's 30% and 50% underestimation of mean skin temperature decrement for standing and cycling conditions respectively. These findings contribute to the broader goal of a thermal comfort model for application to urban microclimate.
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