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

This preview shows pages 1–3. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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)
This is the end of the preview. Sign up to access the rest of the document.

## 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.

### Page1 / 10

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

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online