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Vertical Sky Component try our VSC calculator
The Vertical Sky Component is a measure of the amount of skylight incident on a vertical plane (it is the Sky Factor on a Vertical Plane). It is most commonly applied to the light incident at the centre of a window and in this sense is a measure of the potential for good daylighting. The VSC is calculated by taking the ratio of the skylight incident at a point to the unobstructed skylight available at that same point on a horizontal plane. For a uniform sky, the maximum value is 50% (since the point is on a vertical plane, clearly only half the hemisphere can contribute). For a CIE sky, the maximum value is 39.6%. |
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In this example, we show how the VSC varies across the face of a set of windows. Clearly, the further down the windows are, the less light they receive, and the lower the value of the VSC. |
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BRE Criterion |