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This paper aims to identify the effect of solar control devices - vertical sun louvers - in an open-planoffice space with a western full glazing facade in order to test the optimization level of energyperformance within office buildings in Cairo through controlling the different configurations of thevertical louvers. An action experimental research is used to investigate annual cooling loads(representing energy performance).Environmental simulation software (Design Builder for thermal and energy + for analysis) are usedduring this testing research to investigate the effect of changing rotation angle of vertical louvers onannual cooling loads. It is concluded that energy performance can be enhanced while applying smalland large values of rotation angles of vertical louvers.

THE EFFECTIVENESS OF DIFFERENT CONFIGURATIONS OF VERTICAL LOUVERS ON ENERGY PERFORMANCE IN OFFICE BUILDINGS IN CAIRO