| Title |
Insulation Performance and Heating and Cooling Energy Consumption depending on the Window Reveal Depth in External Wall Insulation |
| Authors |
Rhee, Kyu-Nam ; Jung, Gun-Joo |
| DOI |
https://doi.org/10.5659/JAIK_SC.2017.33.12.91 |
| Keywords |
Window Reveal Depth ; Thermal Bridge ; Linear Thermal Transmittance ; Solar Heat Gain ; Heating and Cooling Energy |
| Abstract |
In this study, the effect of window installation position in the residential building with the external insulation was numerically investigated in terms of insulation performance and heating/cooling energy consumption. For different window positions, 2-D heat transfer simulation was conducted to deduce the linear thermal transmittance, which was inputted to the dynamic energy simulation in order to analyze heating/cooling energy consumption. Simulation results showed that the linear thermal transmittance ranges from 0.05 W/mK to 0.7 W/mK, and is reduced as the window is installed near the external finish line. Indoor surface temperature and TDR analysis showed that the condensation risk is the lowest when the window is installed at the middle of the insulation and wall structure. It was also found that the window installation near the external finish can reduce the annual heating/cooling energy consumption by 12~16%, compared with the window installation near the interior finish. Although the window installation near the external finish can achieve the lowest heating/cooling energy consumption, it might lead to increased condensation risks unless additional insulation is applied. Thus, it can be concluded that the window should be installed near the insulation-wall structure junction, in consideration of the overall performance including energy consumption, condensation prevention and constructability. |