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노후 단독주택 그린 리모델링을 대상으로 한 단열재 사양에 따른 경제성 분석에 관한 연구
황석호 한국건축친환경설비학회 2022 한국건축친환경설비학회 논문집 Vol.16 No.6
In green remodeling, the insulation reinforcement is the most common method. The insulation remodeling can achieve higher energy savings at low cost. In this study, economical analysis for old detached house was performed by the insulation type and thickness according to the energy saving level, insulation codes, cost-benefit. In the case of Extruded Polystyrene (XPS) foam insulation, the energy performance and Net Present Value are highest among analysis cases, but the economic feasibility will be lowered because the increase of construction cost is greater than energy cost savings due to increasing insulation thickness. Expendable Polystyrene (EPS) foam Class 1 No. 4, which has the lowest material cost, indicate the fastest simple payback period. However, in the cost benefit analysis considering the cost reduction due to energy saving, the EPS Class 2 No. 4 100 mm indicate highest benefit.
노후 단독주택의 난방에너지 효율 개선을 위한 대안 선정 방법에 관한 연구
황석호 한국태양에너지학회 2019 한국태양에너지학회 논문집 Vol.39 No.2
More than 76% of the detached houses in Korea are over 20 years old. These old detached houses have poor energy efficiency. According to the 2017 Housing Census (Statistics Korea), more than 50% of low-income families live in detached houses. Therefore, the improvement of energy efficiency in old detached houses is needed from the viewpoint of energy welfare. The general method of building energy modelling for the verification of energy efficiency is based on the construction year data of “Building Design Criteria for Energy Saving” due to the cost and time involved in collecting the thermal performance data of buildings. There is poor accuracy with the deterioration of long-term aging of building materials. Also, the selection of alternatives for energy performance improvement is based on the items to be applied, not a performance improvement goal. It is difficult to calculate energy performance that reflects variations in various parameters with dynamic energy simulations. In this study, the influence of long-term aging is used to accurately predict the energy performance of old detached houses. The building energy modelling method is called ENERGY#, which is a static analysis method based on ISO13790. Energy performance is evaluated by a combination of input variables including building orientation, insulation of walls and roof, thermal performance of windows and window/wall ratio, and infiltration rate. Finally, this study provides a way to determine alternatives that meet energy performance improvement goals.