에어캡 부착에 따른 창호의 단열성능 비교

The purpose of this study is to compare the thermal insulation performance of windows according to the formation of air layer and to evaluate its energy efficiency on a selected house. A thermal insulation test, KS F 2278 was used to measure U-value (Heat transmission coefficients) for the following three cases: the first case (Case 1) is a Low-E pair glass (Argon injected), the second case (Case 2) is a Low-E pair glass with the air cap attached on the glass surface, and the third case (Case 3) is a Low-E pair glass, on the frame of which the air cap is attached. As results of the tests, the U-values of Case 1, Case 2, and Case 3 were 1.67W/㎡·K, 1.57W/㎡·K, and 1.32W/㎡·K respectively. The Case 2 had about 6.0% lower value than the Case 1, and the Case 3 had about 21.0% lower value than the Case 1. It seems that the thermal performance of the windows is attributed to an increase of the heat resistance and the thickness of air layer. This study suggests that the formation of air layer (by using air cap) and its thickness should reduce the heat energy demand and thus improve the energy saving grade as well as the energy saving rate.