Journal
INTERNATIONAL JOURNAL OF BIOMETEOROLOGY
Volume 52, Issue 1, Pages 69-84Publisher
SPRINGER
DOI: 10.1007/s00484-007-0100-0
Keywords
outdoor bioclimatic comfort; open urban area; questionnaire survey; physiological equivalent temperature; thermal perception
Funding
- Fundação para a Ciência e a Tecnologia [POCI/GEO/61148/2004] Funding Source: FCT
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This paper describes the application of a methodology designed to analyse the relationship between climatic conditions and the perception of bioclimatic comfort. The experiment consisted of conducting simultaneous questionnaire surveys and weather measurements during 2 sunny spring days in an open urban area in Lisbon. The results showed that under outdoor conditions, thermal comfort can be maintained with temperatures well above the standard values defined for indoor conditions. There seems to be a spontaneous adaptation in terms of clothing whenever the physiological equivalent temperature threshold of 31 degrees C is surpassed. The perception of air temperature is difficult to separate from the perception of the thermal environment and is modified by other parameters, particularly wind. The perception of solar radiation is related to the intensity of fluxes from various directions (i.e. falling upon both vertical and horizontal surfaces), weighted by the coefficients of incidence upon the human body. Wind was found to be the most intensely perceived variable, usually negatively. Wind perception depends largely on the extreme values of wind speed and wind variability. Women showed a stronger negative reaction to high wind speed than men. The experiment proved that this methodology is well-suited to achieving the proposed objectives and that it may be applied in other areas and in other seasons.
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