This paper aims to identify the effect of solar control devices - vertical sun louvers - in an open-plan
office space with a western full glazing facade in order to test the optimization level of energy
performance within office buildings in Cairo through controlling the different configurations of the
vertical 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 used
during this testing research to investigate the effect of changing rotation angle of vertical louvers on
annual cooling loads. It is concluded that energy performance can be enhanced while applying small
and large values of rotation angles of vertical louvers.