Analysis of Daylighting Benefits for Office Buildings in Egypt

[+] Author and Article Information
Mostafa Abd El Mohimen

Shoubra Faculty of Engineering, Banha Branch,  Zagazig University, Cairo, Egypt

George Hanna

 Housing and Building Research Center, Cairo, Egypt

Moncef Krarti

CEAE Department, CB 428, University of Colorado, Boulder, CO 80309

J. Sol. Energy Eng 127(3), 366-370 (Oct 13, 2004) (5 pages) doi:10.1115/1.1877472 History: Received March 31, 2004; Revised October 13, 2004

This paper summarizes the results of a simulation analysis to determine the effectiveness of daylighting in reducing electrical energy consumption for office buildings in Egypt. Specifically, the impact on daylighting performance is investigated of window size, building size, daylighting control, and glazing type for three geographical locations in Egypt. It was determined that a window to wall area ratio of 0.20 minimizes the total annual electricity use for office buildings in three Egyptian locations, Cairo, Alexandria, and Aswan. A simplified analysis method is developed based on the analysis results to estimate the annual electrical energy savings attributed to daylighting.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Typical building considered in the analysis

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Figure 2

Energy savings relative to window area for a square building in Cairo

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Figure 3

Lighting reduction as function of daylighting aperature for (a) Cairo and (b) Alexandria

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Figure 4

Typical daylighting controls, (a) dimming and (b) stepped

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Figure 5

Effect of window-to-wall ratio on the total annual electricity use of a typical office building in Cairo for various glazing types but without daylighting

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Figure 6

Effect of window-to-wall ratio on the total annual electricity use of a typical office building for various glazing types for various daylighting controls when reflective double-pane glazing is used.




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