Building Envelope Design/Retrofit Utilizing Fresnel Type Overhangs in Hot Climates

Abstract

The selection of exterior elements for control of solar incidence has been a major concern for engineers, architects, and lighting designers. This concern relates to problems of thermal heat gain, direct glare and veiling reflectance. Of equal concern is the quality of the view impacted by these various shade elements. Researchers and lighting designers have discovered these concerns are integrally connected to each other. (Erhardt 1987) A common denominator is the concept of luminance and adaptation levels that impact occupant perception of the interior lighted space and exterior views. A realistic solution to the control of the visual environment is the Fresnel Overhang System. This element has been available for years but until recently has been largely ignored. The qualities of this system and its relationship to the thermo-visual environment will be discussed.