Recently, supplying glass space like atrium is being extended widely for introducing natural light into a building, improving rest room functions and having a pleasant work environment. However, some problems can occur in atrium such as overheating and excessive vertical temperature difference during the summer time, making people feel unpleasant and increase air conditioning load. This study targets that the air conditioning load according to characteristics of the atrium's various windows can be expected through building energy performance evaluation analysis. Esp-r was used for simulation to evaluate air conditioning energy load. A building, which is located in Seoul, was selected for evaluating energy performance and modeling. The analysis model was divided into the main building and Atrium. Window 5.0 was used to acquire optical datum which put into Esp-r construction data base. As a simulation result, 1) Blue Low-e window decreased load 25% is most effective for reducing energy load.2) Solar radiation at each direction, eastern and roof have relatively high, southern and northern were not big.3) Eastern and roof surface had the remarkable temperature increase during cooling period as increasing cooling energy load.
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