공공건축물 설계단계 PV·BIPV·ESS 투자 우선순위 도출 = Deriving Investment Priorities for PV, BIPV, and ESS in Public Building Design

국문 초록 (Abstract)

ISO 15686-5 기반 LCC 프레임워크를 구축하여 공공건축물 설계단계 PV·BIPV·ESS 경제성을 비교하고 투자 우선순위를 도출하였다. 2025년 실제 단가 기반 12개 시나리오(할인율 4.5%, 40년) 분석 결과, BIPV 100%(S4)가 NPV 3.98억 원·B/C 2.39·IRR 19%로 최우수 단일 대안으로, PV·BIPV 조합(S7)이 NPV 1.49억 원·B/C 1.40으로 최적 복합 대안으로 확인되었다. ESS 포함 시나리오는 반복 교체비 및 에너지 손실로 낮은 경제성을 보였다.

다국어 초록 (Multilingual Abstract)

This study develops a hybrid Life Cycle Cost (LCC) analysis framework based on ISO 15686-5 to evaluate the economic feasibility ofphotovoltaic (PV), Building-Integrated Photovoltaics (BIPV), and Energy Storage Systems (ESS) in public buildings and to derive investmentpriorities under budget constraints. Twelve system scenarios were analyzed over 40 years at a 4.5% social discount rate using actual 2025design cost data. Among single-system scenarios, BIPV 100% (S4) achieved the highest economic feasibility with an NPV of approximatelyKRW 398 million, a B/C ratio of 2.39, and an IRR of 19%, driven by a high policy adjustment factor (k_policy = 6.12). The combined PV–BIPV scenario (S7) was identified as the optimal hybrid configuration with an NPV of KRW 149 million. ESS-inclusive scenarios showedconsistently low economic viability due to recurring battery replacement costs and round-trip energy losses. The proposed CAPEX–NPVmatrix offers a practical decision-support tool for optimal system selection at the building design stage.