| 요약2 |
The purpose of this study was to verify the suitability of the simulation test for domestic and international window-set U-values by discussing the input conditions and calculation methods for the same simulation test and comparing the calculated results for various window-sets. To this end, a total of 18 cases were selected, where glass, cavities, frames, spacers, windows sizes, etc, for double glazing fixed-windows and triple glazing fixed-windows have been changed. Then, domestic and international U-values by criteria were compared by performing a simulation using WINDOW&THERM, a certified program. The analytic results of domestic and international standards revealed that domestic standards and NFRC used the calculation method through the Edge area and that CEN used linear thermal transmittance(ψ) as a calculation method. In the Indoor and outdoor temperature conditions, domestic standards and CEN were similar but NFRC was somewhat different. The results of comparing U?value errors based on the Korea test found NFRC -6.22% ~+9.50%, CEN -4.98% ~ -1.23%. The U-value of the case calculated based on CEN standards tended to be mostly higher than that in domestic conditions. This tendency may have been caused by the difference between convective heat transfer coefficient and frame effective thermal conductivity in air space. The results of the domestic standards-applied simulation of window-set thermal transmittance showed an error rate within 10%, compared to NFRC and CEN. The above study confirmed the suitability of the simulation test for domestic window-set U-values. |