Journal
SOLAR ENERGY
Volume 82, Issue 11, Pages 986-998Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2008.05.004
Keywords
Urban heat island intensity (UHI); Sky cloud conditions; Core; Urban; Semi-urban; On-site variables
Categories
Funding
- EPSRC [EP/E016308/1]
- EPSRC [EP/E016375/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E016308/1, EP/E016375/1] Funding Source: researchfish
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The study looks at the potential of physical characteristics in mitigating the urban heat island intensity (UHI) in London during summer. This research uses six on-site variables namely aspect ratio, surface albedo, plan density ratio, green density ratio, fabric density ratio and thermal mass for the investigation in six data sets. The climatic variations in summer are controlled by classifying the data into clear sky, partially cloudy and cloudy periods. Geographical variation is controlled by classifying the data into core, urban and semi urban areas. Maximum daytime UHI of 8.9 degrees C is found in semi-urban area during partially cloudy period while maximum nocturnal UHI of 8.6 degrees C is found in urban area during clear sky period when the wind velocity is below 5 m/s. The most critical climate and geographical location in determining the changes in outdoor air temperature in London are partially cloudy periods and urban areas respectively. Among the variables studied, most critical variable that determines the daytime and nocturnal changes in outdoor air temperature is surface albedo. (C) 2008 Elsevier Ltd. All rights reserved.
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