제로에너지 공동주택을 위한 태양광 발전시스템의 경제성 분석

Purpose: Photovoltaic System (PV System) is considered an essential element for zero-energy buildings. In this study, the possibility of zero-energy buildings was examined by installing a PV system in multi-residential buildings. The purpose of this study is to analyze the economic feasibility according to the energy independence rate through the construction cost of the installed PV system. Method: The research method is carried out by dividing into 5 stages. 1) Select the target building and set the production amount according to the PV system scale and energy independence rate of multi-residential buildings. 2) Plan to install the PV system on the roof and elevation in consideration of design and productivity. 3) Calculate the PV system installation capacity of the roof and elevation according to the energy independence rate. 4) Calculate the PV system quantity and construction cost for each roof and elevation. 5) Analyze economic feasibility through cost-benefit analysis and payback period analysis of installed the PV system. Result: The results of analysis of building floor scale, energy independence and economic feasibility of PV system in multi-residential buildings were synthesized. It was analyzed that within the 25-year recovery period, zero-energy 1st grade level could have 10 ?story, 2nd grade could have 12-story, and 3rd grade could have 17-story. In addition, in terms of economical efficiency, a 20-story 4th grade level, which has a payback period of less than 14 years with PV system installed on the roof alone, is optimal.