Back to Search
Start Over
Summertime heat island intensities in three high-rise housing quarters in inner-city Shanghai China: Building layout, density and greenery.
- Source :
- Building & Environment; Jan2010, Vol. 45 Issue 1, p115-134, 20p
- Publication Year :
- 2010
-
Abstract
- Abstract: Shanghai as the largest city in China has been suffering from the ever-worsening thermal environment due to the explosive urbanization rate. As an indication of urbanization impact, urban heat islands (UHI) can give rise to a variety of problems. This paper reports the results of an empirical study on the summertime UHI patterns in three high-rise residential quarters in the inner-city Shanghai. Site-means of UHI intensity are compared; case studies are carried out on strategically located measurement points; and regression analysis is followed to examine the significance of the on-site design variables in relation to UHI intensity. It is found that site characteristics in plot layout, density and greenery have different impacts on UHI-day and UHI-night patterns. Day-time UHI is closely related to site shading factor. Total site factor (TSF) as an integrated measure on solar admittance shows a higher explanatory power in UHI-day than sky view factor (SVF) does under a partially cloudy sky condition. Night-time UHI cannot be statistically well explained by the on-site variables in use, indicating influences from anthropogenic heat and other sources. Evaporative cooling by vegetation plays a more important role at night than it does at day. Considered diurnally, the semi-enclosed plot layout with a fairly high density and tree cover has the best outdoor thermal condition. Design implication based on the findings, with consideration on other important environmental design issues, is briefly discussed. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 03601323
- Volume :
- 45
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Building & Environment
- Publication Type :
- Academic Journal
- Accession number :
- 44260095
- Full Text :
- https://doi.org/10.1016/j.buildenv.2009.05.010