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Effect of urban geometry on solar insolation threat in JSNAC (pilot study)

Ahmad, Mohd. Hamdan and Ossen, Dilshan Remaz and Kui Lam, Jiih (2008) Effect of urban geometry on solar insolation threat in JSNAC (pilot study). In: 10th SENVAR + 2nd ISESEE 2008 Humanity & Technology, 2008, Shah Alam.

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Inappropriate orientation and proportioned outdoor plaza or open space generates thermal discomfort in less-winded areas, especially in equatorial tropics. Shadow umbrella theory has been proposed by Emanuel R. (2003) as a hypothetical planning solution to reduce or prevent solar radiation into public outdoors. The decisive factor is to optimize shaded public outdoor spaces using urban build form. The planning layout of Johor State New Administrative Centre has similarities with Putrajaya administrative centre layout, which experiences an Urban Heat Island phenomenon. The most common feature is that the ‘office clusters’ planning in both cases are placed around an open plaza. The orientation of the plaza is based on the symmetric planning layout rather than any environmental principles. The ratio between the open plaza and the surrounding office blocks does not match with the previous research findings, i.e. the length to width ratio, and the height of buildings. This paper discusses and evaluates the effectiveness of existing plazas in the new administrative centre in Johor by using data from literature review and through software simulations. It is to investigate different width and length of the plazas, height of the surrounding buildings and different orientations of the plaza. Influence of solar radiation incident on the build form is determined using Ecotect 5.2 computer simulation program. The plaza in office cluster in Johor new administrative is later found to be oversized and inappropriately orientated. The results show that optimal ratio of building cluster geometry is 1: 1.5-2: 0.27-0.5 (W:L:H), which comply to ideal urban proportion theories suggested by researchers of this field.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Shadow umbrella, solar insolation, urban geometry, JSNAC
Subjects:T Technology > TH Building construction
Divisions:Built Environment
ID Code:15876
Deposited By: Siti Khairiyah Nordin
Deposited On:05 Oct 2011 09:51
Last Modified:05 Oct 2011 09:51

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