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Planning for Solar Access & Building Orientation

Planning for Solar Access
Master planning of an area or region is an ideal opportunity to provide solar access. Planning for solar access at the largest scale can very simplify the design for natural light at the building scale. 
 
Topography may be used to provide shade or access sunlight. When properly oriented and located, circulation patterns can provide solar access between building and masses. 










In urban design; large buildings often shade close by buildings or themselves. This can be an asset when cool courtyards are created or a liability when dark, huge urban streets are created. Zoning codes in many urban areas include daylight or solar access requirements to regulate building massing. Codes that specify access to daylight enhance views of the sky, whereas codes that specify access to sunlight must consider temporal orientation and sun angles.



Solar envelopes

Solar envelopes are three dimensional design tools used to maximize the buildable volume on particular site, while preserving access to sunlight for close by buildings. The basic elements used to design a solar envelope are: latitude, size, orientation and topography of the site; times of day solar access is desired and impact of shading on the site.

Building orientation


Planning for solar access includes more than direct solar access and shading. Urban planning e appropriate building orientation (typically elongated on the east-west axis) and thereby facilitate use of direct sunlight, shading and sunlight reflected from nearby ground and buildings.

Building orientation facilitates the use of natural light in buildings. Building orientation is critical for shading and redirecting sunlight, but less for non-directional daylight.




Long axis running North-South
Buildings oriented with the long axis running-north south usually have greatest exposure to the morning sun. The east and west facades receive more light during the summer than during the winter. Because of low -angle sunlight orientations it is hard to shade direct sunlight without also blocking the view. Openings on the east and west sides of buildings are less preferred for illumination, especially side lighting. However, toplighting with this orientation can give the best constancy of daylighting through the day.
Long axis running East-West
Buildings oriented with the long axis running east-west usually have greatest exposure to southern sunlight. This is generally the preferred building orientation. High summer sun has greatest impact on the roof and horizontal surfaces. The north-south faces are the easiest to shade, often by a simple device. The effects of the orientation are greatest at the northern latitudes where sun angle is lower. The higher-angle sunlight entering the openings on the north and south facades illuminates the horizontal surfaces well.


Follow us on our next article “ Room Proportion & Reflectances ”.
 
Sources;
Architectural Lighting
Book: Architectural Lighting by M. David Egan and Victor W. Olgyay

Author


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Sinem Erman

Sinem graduated in 2011 from Istanbul Technical University in Turkey with a BA in Interior Architecture and completed her MDes in Living and Interior Design at Domus Academy in 2013, she joined Planlux in 2018.