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This study reviewed selected specific windows and reviewed the window performance certification criteria including KS F 2278 and KS L 9107 and analyzed the change in performance based on the change of area. This study also compared the heating and cooling loads of an apartment house applied with window performance reviewed in consideration of insulation and SHGC performance and actual size based on KS F 2278. The analyzed window was a double window composed of aluminum and PVC and the building was the apartment house model of 141 m2. The analysis results were as follows. First, as the window glass’s thermal performance is superior to frame, the performance degraded in reduced area. In case of selected window, the 1 m X 1m window’s thermal performance and SHGC decreased by 35% and 37% respectively compared to 2 m X 2 m window. Secondly, in the comparison of performance for increasing area with 2 m X 2 m and 3 m X 3 m windows, the 3 m X 3 m window’s thermal performance and SHCG increased about 14%. Third, in the comparison of heating and cooling loads of the analyzed model considering the apartment house model applied with window performance derived from KS F 2278 and actual figures, the model’s total heating and cooling loads increased by 33% with cooling decreasing by 36% and heating increasing by 77%. Above analysis results show that evaluation of window performance based on criteria such as KS F 2278 and KS L 9107 may lead to distortion of performances different from actual products. Thus, it is necessary to suggest new evaluation criteria.

A Comparative Analysys of Window Energy Performance According to the Difference Between Actual size and Standard size