The primary significance of this paper is the development of guidelines that can help in defining fenestration properties and design factors to increase building performances. Since the influence of fenestration on energy consumption is well known and proved, in order to encourage the development of appropriate designs to ensure high performance office buildings, fenestration guidelines have been developed.;This research consisted of the following two parts. First, in relation to window design of typical office buildings, the main design parameters were considered for (1) daylight simulation using RADIANCE and (2) energy performance using eQUEST, based on the characteristics of the typical office building. Second, window area and properties such as U-factor, SHGC, and VT were considered, because building performance depends on a good configuration of fenestration factors.;The main results of this research provide the necessary criteria with respect to fenestration in order to meet daylight requirements and conserve energy. These fenestration criteria are targeted at architects and designers to facilitate them in the selection of the U-factor, SHGC, VT, and window-to-wall ratio (WWR). Further, the application of the abovementioned method can result in more energy-efficient buildings, which, in turn, can assist in attaining an LEED green building rating system certification.;In sum, in this research, guidelines to estimate energy conservation and daylight performance have been presented. Further, the use of the simplified method developed in this study can help in designing green buildings and obtaining more LEED credits. It is hoped that these criteria will enable architects to achieve better fenestration designs and ensure that they consider window properties and local climate types in the design process.
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