An Analysis of Energy Performance Improvement by Retrofit in Deteriorated Houses

노후주택의 리트로피트를 통한 에너지 성능개선 효과 분석

The aim of the study is to analyze the improvement effect of energy use by replacing high performed thermal insulations, windows, and efficient equipments in deteriorated houses. In this study, 151 numbers of deteriorated houses were selected nationwide, an energy simulation program was developed to evaluate their energy performance, and on-site investigation was conducted. Energy performance evaluation was carried out by comparing before and after retrofit in deteriorated houses and the retrofit was conducted by applying wall insulation and high performed windows. The average floor area of the houses was 33.28$m^2$. The energy simulation program showed that the average of heating energy needs was decreased from 560.46$kWh/m^2$ to 446.04$kWh/m^2$ and the most effective floor area was 10~20$m^2$. Energy reduction rate after retrofit was 6.66% by window replacement, 28.01% by wall insulation reinforcement, and 18.39% by both window replacement and wall insulation reinforcement. The most effective retrofit cost was 900,000won to 1,000,000won and it enables to meet 21.4% of average energy reduction.