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

Older apartment houses to require energy saving because they use more energy than new apartment house that reflect government policies. However, existing apartment houses has many difficulties in saving energy because they do not have enough energy saving standards considering cost. In this paper, it analyzes the cost benefits and suggest method to improve the energy performance in existing apartment houses. For the cost benefit analysis, a DB at cost analysis was constructed and life cycle cost calculation and energy performance evaluation were performed by establishing target buildings. In order to improve the energy efficiency of existing apartment complexes using the evaluation results, two suggestions were suggested. First, in terms of initial investment cost, the case with only insulation was the largest benefit with an average of 2.52. The case of only window had the smallest benefit of 0.93. Second, in terms of life cycle costs, all cases were estimated to be less than 1, so that economic validity could not be secured. The case of only the insulation was the smallest with an average of 0.11, and the case of both the window and the insulation was the largest with an average of 0.30.