Shade and cooling effect of colonnade in low-rise street canyon in tropical climate

The shophouse buildings in Malaysia, which flank commercial streets, are of low-rise planning. The building height is controlled according to council’s plot ratio, but is always built on the development needs. Colonnade has been a part of the shophouse design regulations to provide overhead rain she...

Full description

Saved in:

Bibliographic Details
Main Author:	Lam, Jiih Kui
Format:	Thesis
Language:	English
Published:	2012
Subjects:	NA Architecture
Online Access:	http://eprints.utm.my/id/eprint/34675/1/LamJiihKuiMFAB2012.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-utm-ep.34675
record_format	uketd_dc
spelling	my-utm-ep.346752018-04-27T01:29:18Z Shade and cooling effect of colonnade in low-rise street canyon in tropical climate 2012-03 Lam, Jiih Kui NA Architecture The shophouse buildings in Malaysia, which flank commercial streets, are of low-rise planning. The building height is controlled according to council’s plot ratio, but is always built on the development needs. Colonnade has been a part of the shophouse design regulations to provide overhead rain shelter and for sun shading. Provision of 7.5 feet (2.25 m) is the minimum depth. The main aim of this study is to investigate the potential of colonnade depth to lower the overall air temperature in the urban street microclimate. At the same time, fundamental climatic criteria of overhead shading elements and provision of enough space as a pedestrian thoroughfare in the urban must be fulfilled. Ecotect is used to run the shading analysis. Envelope Ratio and CTTC model are used for air temperature reduction simulations. In a H/W 0.25 street, adequate overhead shading from 1100 to 1600 can only be achieved with Dc/Hc 1.5 and above. This translates to 6 meters of colonnade depth. Colonnade in H/W 2 street with Dc/Hc 1 and above provides comfortable shades throughout the day. To lower the air temperature, the optimum colonnade depth to street width ratio is C/W 0.6. Deeper colonnade will give no significant microclimate improvement. It is found that the ideal colonnade ratio is C/W 0.2 to 0.6. Existing urban code requires Dc/Hc 0.75. In a north-south street, it is only able to offer adequate shade of 2 meter from 1230 to 1400. In a east-west street, it is only able to give 1 to 1.5 meter of shade, during the extreme case of summer and winter solstice. Existing colonnade depth of 2.25 meter and street width of 15 meter will give C/W 0.15. In both shallow and deep canyons, the effect in reducing the air temperature is limited. 2012-03 Thesis http://eprints.utm.my/id/eprint/34675/ http://eprints.utm.my/id/eprint/34675/1/LamJiihKuiMFAB2012.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:69771?site_name=Restricted Repository masters Universiti Teknologi Malaysia, Faculty of Built Environment Faculty of Built Environment
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	NA Architecture
spellingShingle	NA Architecture Lam, Jiih Kui Shade and cooling effect of colonnade in low-rise street canyon in tropical climate
description	The shophouse buildings in Malaysia, which flank commercial streets, are of low-rise planning. The building height is controlled according to council’s plot ratio, but is always built on the development needs. Colonnade has been a part of the shophouse design regulations to provide overhead rain shelter and for sun shading. Provision of 7.5 feet (2.25 m) is the minimum depth. The main aim of this study is to investigate the potential of colonnade depth to lower the overall air temperature in the urban street microclimate. At the same time, fundamental climatic criteria of overhead shading elements and provision of enough space as a pedestrian thoroughfare in the urban must be fulfilled. Ecotect is used to run the shading analysis. Envelope Ratio and CTTC model are used for air temperature reduction simulations. In a H/W 0.25 street, adequate overhead shading from 1100 to 1600 can only be achieved with Dc/Hc 1.5 and above. This translates to 6 meters of colonnade depth. Colonnade in H/W 2 street with Dc/Hc 1 and above provides comfortable shades throughout the day. To lower the air temperature, the optimum colonnade depth to street width ratio is C/W 0.6. Deeper colonnade will give no significant microclimate improvement. It is found that the ideal colonnade ratio is C/W 0.2 to 0.6. Existing urban code requires Dc/Hc 0.75. In a north-south street, it is only able to offer adequate shade of 2 meter from 1230 to 1400. In a east-west street, it is only able to give 1 to 1.5 meter of shade, during the extreme case of summer and winter solstice. Existing colonnade depth of 2.25 meter and street width of 15 meter will give C/W 0.15. In both shallow and deep canyons, the effect in reducing the air temperature is limited.
format	Thesis
qualification_level	Master's degree
author	Lam, Jiih Kui
author_facet	Lam, Jiih Kui
author_sort	Lam, Jiih Kui
title	Shade and cooling effect of colonnade in low-rise street canyon in tropical climate
title_short	Shade and cooling effect of colonnade in low-rise street canyon in tropical climate
title_full	Shade and cooling effect of colonnade in low-rise street canyon in tropical climate
title_fullStr	Shade and cooling effect of colonnade in low-rise street canyon in tropical climate
title_full_unstemmed	Shade and cooling effect of colonnade in low-rise street canyon in tropical climate
title_sort	shade and cooling effect of colonnade in low-rise street canyon in tropical climate
granting_institution	Universiti Teknologi Malaysia, Faculty of Built Environment
granting_department	Faculty of Built Environment
publishDate	2012
url	http://eprints.utm.my/id/eprint/34675/1/LamJiihKuiMFAB2012.pdf
_version_	1747816232024801280

Shade and cooling effect of colonnade in low-rise street canyon in tropical climate

Similar Items