Abstract
Energy performance assessment indices provide a means of rating buildings on how energy saving they are in relation to the amount of energy needed to provide building users with expected degrees of comfort and functionality. This study aims at analyzing the state of the art of office buildings' energy saving level for BEMS in detail through result of assessment indices for energy saving performance presented in previous study in the view of buildings and applied control technologies. And in order to evaluate energy saving performance more clearly in assessment indices, level indices which linked up the level of adoption and the level of technology was defined newly and suggested. For the energy saving level, the result is summarized as follows; applied ratios of operational plans and control environment are 92%, 75%, respectively, which represent the highest level value, and air conditioners and primary pump is 73% and refrigerator, lighting, supply and exhaust fans, boiler is in the range of 59% to 52%. And, non-applied ratio of lighting, chillers, the boiler, supply and exhaust fans is in the range of 38% to 33%, and so active consideration of their technologies into buildings is necessary. And energy saving level is in the range of 89.0 to 49.5 by building and the level of adoption is in the range of 91.3 to 47.9 and the level of technology is in the range of 98.3 to 74.9 and the values are different by building. Through this result, energy saving level of actual buildings could be identified and it can be utilized to provide an alternative to improve energy saving level in the future.