Solar Orientation Strategies in Site Planning
Solar orientation coordinates building placement, massing, glazing, and shading to admit useful sunlight while limiting overheating and glare.
Summary
Solar orientation coordinates building placement, massing, glazing, and shading to admit useful sunlight while limiting overheating and glare. Analysis should use true north, site latitude, seasonal sun paths, surrounding obstructions, and local heating or cooling needs.
An elongated building with its long axis approximately east-west generally reduces difficult-to-shade east and west exposure. Equator-facing façades face south in the Northern Hemisphere and north in the Southern Hemisphere.
| Design condition | Orientation or shading response |
|---|---|
| Heating-dominated climate | Preserve equator-facing winter solar access. |
| Cooling-dominated climate | Prioritize protection from unwanted solar heat. |
| High-angle sunlight | Use appropriately sized horizontal overhangs. |
| Oblique, low-angle sunlight | Use vertical fins or external screens. |
Solar altitude is the sun's angular height above the horizon; solar azimuth is its horizontal direction, commonly measured clockwise from true north. On level ground, shadow length is , where is obstruction height and is solar altitude. At nonpolar sites, the winter solstice has the lowest annual solar-noon altitude and longest noon shadows.
🧠 Key Concepts
- True north
- Seasonal sun paths
- Building long axis
- Equator-facing solar access
- Solar altitude
- Solar azimuth
- Horizontal overhangs
- Vertical fins
- Shadow length
- Tropical solar exposure
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Solar Orientation Strategies in Site Planning
📘 Overview Solar orientation controls a site's exposure to useful sunlight and unwanted solar heat. Building placement, massing, glazing orientation, and shading should respond to latitude, seasonal sun paths, surrounding obstructions, and local heating or cooling needs.
🧠 Key Idea Orient buildings to admit beneficial sunlight while limiting overheating and glare. Favor winter solar access in heating-dominated climates and solar protection in cooling-dominated climates.
⚔️ Core Details: - Base solar analysis on true north, site latitude, and seasonal sun paths rather than magnetic north. - An elongated building with its long axis approximately east-west generally reduces difficult-to-shade east and west exposure. - Prioritize equator-facing solar access for winter heating: south-facing in the Northern Hemisphere and north-facing in the Southern Hemisphere. - Horizontal overhangs suit high-angle sun; vertical fins or external screens address oblique, low-angle sun on east and west exposures. - Tropical sites require seasonal assessment of both north and south façades because the noon sun can occur on either side of the building. - On level ground, shadow length is
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