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

摘要

The selection of exterior elements for control ofsolar incidence has been a major concern forengineers, architects, and lighting designers.This concern relates to problems of thermal heatgain, direct glare and veiling reflectance. Ofequal concern is the quality of the view impactedby these various shade elements. Researchers andlighting designers have discovered these concernsare integrally connected to each other. (Erhardt1987) A common denominator is the concept ofluminance and adaptation levels that impactoccupant perception of the interior lighted spaceand exterior views. A realistic solution to thecontrol of the visual environment is the FresnelOverhang System. This element has been availablefor years but until recently has been largelyignored. The qualities of this system and itsrelationship to the thermo-visual environmentwill be discussed.