Top Lighting - The Lumen Method of Toplighting Roof Plan...

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1 The Lumen Method of Toplighting Roof Plan Section Condition of use: 1. Uniform light distribution 2. No direct sunlight penetration into the room The Lumen Method for Toplighting E wp = average work plane illuminance (fc or lux) E hD = horizontal direct illuminance (from the sun) (fc or lux) E hd = horizontal diffuse illuminance (fc or lux) T total = total skylight transmittance (fc or lux) RCU = Room coefficient of utilization N = number of skylights A s = area of a single skylight (ft 2 or m 2 ) A wp = area of the work plane (ft 2 or m 2 ) Average Diffuse Daylight Illuminance in the Space ( E hD +E hd ) (N. A s ) (t total )(RCU) E wp = A wp
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2 The Lumen Method for Toplighting Average Diffuse Daylight Illuminance in the Space ( E hD +E hd ) (N. A s ) (t total )(RCU) E wp = A wp Total Illuminance Total area of skylights Total transmittance of skylight assembly Efficiency of the room The Lumen Method of Toplighting Step 1: Determine the available daylight on the horizontal roof (Direct + Diffuse)
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This note was uploaded on 04/07/2008 for the course ARCH 342 taught by Professor Boubekri during the Fall '07 term at University of Illinois at Urbana–Champaign.

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Top Lighting - The Lumen Method of Toplighting Roof Plan...

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