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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Krüger, E. L. Minella, F. O. Matzarakis, A. |
| Spatial Coverage | Scotland |
| Description | Author Affiliation: Krüger EL ( Federal Technological University of Parana, Av. Sete de Setembro, 3165, 80230-901, Curitiba, PR, Brazil, ekruger@utfpr.edu.br.) |
| Abstract | Correlations between outdoor thermal indices and the calculated or measured mean radiant temperature T(mrt) are in general of high importance because of the combined effect on human energy balance in outdoor spaces. The most accurate way to determine T(mrt) is by means of integral radiation measurements, i.e. measuring the short- and long-wave radiation from six directions using pyranometers and pyrgeometers, an expensive and not always an easily available procedure. Some studies use globe thermometers combined with air temperature and wind speed sensors. An alternative way to determine T(mrt) is based on output from the RayMan model from measured data of incoming global radiation and morphological features of the monitoring site in particular sky view factor (SVF) data. The purpose of this paper is to compare different methods to assess the mean radiant temperature T(mrt) in terms of differences to a reference condition (T(mrt) calculated from field measurements) and to resulting outdoor comfort levels expressed as PET and UTCI values. The T(mrt) obtained from field measurements is a combination of air temperature, wind speed and globe temperature data according to the forced ventilation formula of ISO 7726 for data collected in Glasgow, UK. Four different methods were used in the RayMan model for T(mrt) calculations: input data consisting exclusively of data measured at urban sites; urban data excluding solar radiation, estimated SVF data and solar radiation data measured at a rural site; urban data excluding solar radiation with SVF data for each site; urban data excluding solar radiation and including solar radiation at the rural site taking no account of SVF information. Results show that all methods overestimate T(mrt) when compared to ISO calculations. Correlations were found to be significant for the first method and lower for the other three. Results in terms of comfort (PET, UTCI) suggest that reasonable estimates could be made based on global radiation data measured at the urban site or as a surrogate of missing SR data or globe temperature data recorded at the urban area on global radiation data measured at a rural location. |
| File Format | HTM / HTML |
| ISSN | 00207128 |
| Issue Number | 8 |
| Volume Number | 58 |
| e-ISSN | 14321254 |
| Journal | International Journal of Biometeorology |
| Language | English |
| Publisher | Springer |
| Publisher Date | 2014-10-01 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Biophysics Models, Theoretical Temperature Thermosensing Cities Environment Humans Humidity Scotland Sunlight Wind Journal Article |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ecology Health, Toxicology and Mutagenesis Atmospheric Science |
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