Journal of Korean Institute of Architectural Sustainable Environment and Building Systems ISSN:1976-6483(Print) 2586-0666(Online) 한국건축친환경설비학회논문집

As green remodeling was selected as one of the top 10 tasks of the Korean version of the Green New Deal, the “public building green remodeling project” is in progress. Currently, research on technology applied to green remodeling and energy performance improvement accordingly are being conducted in various fields, but it is difficult to find a case of energy performance improvement comparable to zero energy buildings. Therefore, this paper introduces the first case of acquiring the zero-energy building certification as the “public building green remodeling project”, and by comparing and analyzing the applied technology and the energy performance with the performance before remodeling, confirmed the energy-saving effect and the possibility of achieving zero-energy buildings through green remodeling. Various passive and active design techniques were applied to the target building. Through this, the energy consumption of 49.10% was reduced compared to before remodeling. An additional 40.58% of energy consumption was reduced through the new and renewable energy technology, and the Energy Self-Sufficient Rate was 79.27%. The target building acquired 30.3 kWh/m²·y of primary energy through green remodeling and obtained the building energy efficiency rating 1⁺⁺⁺ grade and the zero energy building 3 grade. As a result of the application of passive, active, and renewable energy technology elements compared to before remodeling, annual energy prices were reduced from 6,617,136 won/year to 935,523 won/year, reduced 5,681,613 won/year.