Shading performance of polygonal courtyard forms

Muhaisen, Ahmed S.; Gadi, Mohamed B.

doi:10.1016/j.buildenv.2005.04.027

Cited by 61 publications

(38 citation statements)

References 2 publications

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“…It is concluded that geometry has a vital role in thermal behavior of such courtyards along with proper orientation and regulating ventilation as well as appropriate shadowing could improve the microclimatic situation. Muhaisen and Gadi's research on circular, polygon and rectangular courtyards indicate dimensions, proper proportion, latitude and climatic conditions are effective in terms of appropriate shadowing in a courtyard (Muhaisen & Gadi, 2006a) (Muhaisen & Gadi, 2005) (Muhaisen, 2006). They also suggest the optimum height for rectangular courtyards in hot and humid, hot and dry, temperate and cold climates are 4, 2 and 1 floor respectively.…”

Section: Introductionmentioning

confidence: 98%

Numerical evaluation of thermal comfort in traditional courtyards to develop new microclimate design in a hot and dry climate

Nasrollahi

Hatami

Khastar

et al. 2017

Sustainable Cities and Society

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The growing interest in thermal comfort of outdoor environments yields in different analysis on courtyards as a common space between urban and architectural scales. However, there is a limited knowledge regarding the microclimatic behavior of such spaces. Using ENVI-met simulations, this paper aims to numerically discuss the thermal performance of different configurations of traditionally designed courtyards in Shiraz, Iran, which experiences hot summers and cold winters. The geometrical effects such as orientation and H/W (height to width ratio) of courtyards are considered as potential parameters to improve the microclimatic conditions. In this paper, PMV and UTCI are used as thermal comfort indices.The obtained results indicate mean radiant temperature and wind speed as the most effective parameters for thermal comfort of courtyards. In addition, the aforementioned geometrical parameters might not be able to solely create a desirable condition, but they could significantly improve the thermal comfort of courtyards during summer and winter. To achieve a desirable thermal comfort level, the results suggest using configurations of a high H/W rate and southward orientation in order to obtain better shading during summer as well as allowing the solar radiation in while regulating the wind speed in winter.

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Section: Introductionmentioning

confidence: 98%

Numerical evaluation of thermal comfort in traditional courtyards to develop new microclimate design in a hot and dry climate

Nasrollahi

Hatami

Khastar

et al. 2017

Sustainable Cities and Society

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“…1). Then, analogous to the undertaken approach by Muhaisen (2006) and Muhaisen and Gadi (2006) all models are evaluated in solstices 22nd June and 21st December as the two peak days representing summer and winter time respectively. Modeling of the street canyon is based on Oke (1988) model, having two symmetrical and continuous flanks with no opening along the street and within urban areas.…”

Section: Methodsmentioning

confidence: 99%

Influence of Geometry and Orientation on Flank Insolation of Streets in an Arid Climate City

Mazloomi¹,

Hassan²,

Bagherpour³

et al. 2010

American J. of Engineering and Applied Sciences

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Problem statement: Whilst at the design stage the various aspects of design impact must be taken into account, the incident solar radiation, insolation, is a key to many environmental aspects of street canyons. In this regard, the configuration of an urban street has a decisive role in magnitude of the solar radiation which it receives on its flank. This study aimed the influence of geometry and orientation of urban street canyon on flank insolation in an arid climate city. Approach: This study approached numerical simulation and employs a computational programme to carry out a 2D simulation within Urban Canopy Layer; (UCL). To enhance the resolution, the simulation condition is based upon accumulative hourly insolation on the daily-basis sun movement for the both solstices as the two extreme days of the year. Results: Geometry has an inverse influence on flank insolation and streets approaching deeper canyons would have lower insolation in both summer and winter. The orientation influence on insolation is to be seen with the season. In winter, orientation effect is analogous to geometry impact and higher inclined canyons would have lower insolation on their flank. In summer, increase in orientation causes variation in flank insolation of which the variation trend is not in the same direction. Conclusion: This study showed that both geometry and orientation influence the solar radiation incident on the street flank and therefore ought to be considered in the design stage where the designers can take full advantages. The increase in geometry or orientation towards deeper canyon and higher inclination respectively, yield insolation reduction excluding for the orientation influence in summer that causes insolation variation.

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“…Hence, taller walls should surround courtyards in hotter climates and courtyards in colder climates could function with lower surrounding walls. Muhaisen & Gadi (2006) found that the deep courtyard form produced more internal shadow in summer while shallow form performed better in winter. The study has recommended an annual calculating ratio.…”

Section: Courtyard Configurationmentioning

confidence: 99%

“…On the other hand, Muhaisen & Gadi (2006) studied the polygonal courtyard forms (non typical form) and its shading performance to develop a shading calculation tool for courtyards. The study concluded that courtyard geometry and proportions have a significant influence on the shading produced on the internal surface.…”

Section: Courtyard Configurationmentioning

confidence: 99%

Courtyards Design Variants and Its Functions in Malaysian Hospitals

Almhafdy¹,

Ibrahim²,

Ahmad³

et al. 2016

AjBeS

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The courtyard becomes a vital element that commonly applied in tropical buildings for its environmental, social and therapeutic potentials. However, effort to examine its usage and design variants is limited. This paper focuses on the application of courtyards in the context of Malaysian hospitals. Thirty-two courtyards were inventoried. Besides the courtyard functions, design variants were recorded in terms of its form and aspect ratio, courtyard orientation and physical features. The results revealed that the courtyards in the Malaysian hospitals buildings are creatively manipulated. The paper concludes with an outline of means to optimize a courtyard's microclimatic and healing performances.

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Shading performance of polygonal courtyard forms

Cited by 61 publications

References 2 publications

Numerical evaluation of thermal comfort in traditional courtyards to develop new microclimate design in a hot and dry climate

Numerical evaluation of thermal comfort in traditional courtyards to develop new microclimate design in a hot and dry climate

Influence of Geometry and Orientation on Flank Insolation of Streets in an Arid Climate City

Courtyards Design Variants and Its Functions in Malaysian Hospitals

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