Analysis of the Energy Consumption of Old Public Buildings in South Korea after Green Remodeling

In Korea, green remodeling of public buildings will be mandatory from 2025, and about 30,000 old public buildings nationwide will conduct green remodeling every year. Therefore, in this study, green remodeling was promoted to improve energy efficiency for existing public buildings located in Siheung, Gyeonggi-do. A remodeling method was developed to reduce the cooling and heating load of the building and reduce construction costs. The development technology was applied to the demonstration building to improve the insulation and airtightness performance of the building. In order to analyze the effect of improving the energy performance of the building, the simulation results and energy consumption before and after remodeling were analyzed. The demand for heating energy decreased by about 68.95%, and the demand for cooling energy decreased by 35.21%. According to an analysis of actual energy consumption, the average monthly energy consumption savings from January to September was 17.4%. It was confirmed that the savings were the highest at 35.4% in February, during winter. Applying the remodeling method developed in this study is expected to contribute to reducing greenhouse gas emissions by reducing energy efficiency and energy consumption of existing buildings.