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Although interest in and the importance of green building certification have increased, it is difficult to determine how much less energy the buildings actually consume after obtaining sustainability related certification, such as LEED in the USA, and G-SEED in Korea. Focusing on building energy evaluation, we compared and analyzed the energy evaluation items of LEED and G-SEED. In addition, from the Korean public data portal site, this study investigated the annual site energy consumption (electricity and gas) per floor area of non-residential buildings that obtained G-SEED certification in Korea. The energy consumption of non-certified general buildings was compared with the energy consumption of certified buildings. As a result of examining 84 samples of this study, non-residential buildings with G-SEED certification showed energy use intensity that was at least (35.5 to 48.9)% lower than that of uncertified buildings.

The purpose of this study is to analyse the heat flux difference and examine applicability of the heat flux sensor along with various sensor attachment methods. Using multiple sensors and various tapes, a KS F 2278 thermal test was performed in hot/cold chamber conditions with standard panel specimen. The measured heat flux values of sensors were stable. But values of sensors were smaller than the heat flux result of KS F 2278. Thus, thermal resistance of attachment tape on a sensor should be considered during on site U-value measuring process. This study also examined the differences between measured U-value and design U-value by attaching the different sensors in the same area using multiple heat flux sensors. All cases are shown to the same patterns on each heat flux and U-value graph, but U-values with regard to various sensors have shown some differences to the designed values. Using in-situ measurement, the EIFS wall was found to be difficult to measure accurately due to the small level of heat flux.

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Countries around the world develop and use software based on the monthly calculation method of DIN V 18599:2007 and EN ISO13790 for building energy performance evaluations. The purpose of this study is to propose a method that can consider the effect of reducing cooling energy demand by hybrid ventilation outdoor air cooling in monthly calculation method-based software. For ventilation simulation, some representative floor plans and area types of Korean residential buildings were established through literature research. A number of dynamic energy simulations were performed for various building orientations, heights, and opening factors. Based on the simulation results, a nomograph that can calculate the cooling energy demand reduction factor according to hybrid ventilation that can be applied to the ventilation heat transfer coefficient is proposed.