Abstract
Despite of government's continued support for building sector, Korea lacks practical technology for building energy management. To achieve this, first of all the system that measures and manages actual building energy is necessary. But, in the case of existing buildings, only a few buildings are equipped with these systems. In this study, First, meters were installed inside a building to measure and manage existing building's energy consumption. Second, improvement measures that can reduce energy consumption were identified by analyzing the measured data. Finally, it is suggested the ways to save energy of building. The result of this study, the case applied blinds and daylight control has energy savings up to 7.8% and keeps down electric charges about 76 million won.