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Outdoor thermal comfort and summer PET range: A field study in tropical city Dhaka

Sharmin, Tania, Steemers, Koen and Humphreys, Michael 2019. Outdoor thermal comfort and summer PET range: A field study in tropical city Dhaka. Energy and Buildings 198 , pp. 149-159. 10.1016/j.enbuild.2019.05.064

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Abstract

Urban microclimate has important consequences on the thermal sensation of pedestrians. However, the extent of this effect may vary as other parameters such as respondents’ personal factors, psychological and behavioural aspects and cultural backgrounds may be involved. This heightens the need for subjective assessment and on-site questionnaire surveys alongside objective field measurements to understand outdoor comfort conditions which is essential for creating sustainable urban spaces. In this study thermal comfort conditions outdoors are examined through field surveys in the high-density, tropical city Dhaka, where extensive microclimatic monitoring has been carried out in parallel to subjective responses of the pedestrians. Microclimatic conditions, which are affected by the urban geometry, are found to be statistically correlated with thermal sensation votes (TSV), with air temperature, globe temperature and mean radiant temperature being the most important parameters (correlation coefficients of r = 0.47, 0.45 and 0.44 respectively). The study also reports the effect of urban geometry parameters on microclimatic conditions, identifying strong correlations with globe temperature (r =-0.50), mean radiant temperature (r =-0.48) and wind speed (r =0.72). Furthermore, the study proposes acceptable ranges (upper limits) for PET for the tropical climate of Dhaka with a ‘Neutral’ range between 29.50 – 32.50C confirming that people in outdoor conditions will feel comfortable at a higher PET range.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Architecture
Uncontrolled Keywords: Outdoor thermal comfort; Thermal Sensation Vote (TSV); PET analysis; Tropical climate
Publisher: Elsevier
ISSN: 0378-7788
Funders: Schlumberger Foundation Faculty for the Future Award
Date of First Compliant Deposit: 10 October 2019
Date of Acceptance: 31 May 2019
Last Modified: 31 May 2020 02:05
URI: http://orca.cf.ac.uk/id/eprint/125935

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