• Performance Analysis of Photovoltaic Power Forecasting Based on Input Feature Configuration and Selection

    입력 특징 구성 및 선택에 따른 태양광 발전량 예측 성능 분석

    Sohyun Lee, Daejong Lee, Myunggeun Chun

    이소현, 이대종, 전명근

    This study investigated the impact of different input feature configurations on photovoltaic (PV) power forecasting performance. Four feature groups were defined: a … + READ MORE
    This study investigated the impact of different input feature configurations on photovoltaic (PV) power forecasting performance. Four feature groups were defined: a basic feature group comprising solar position and temporal information, a meteorological feature group, an autoregressive feature group, and a dynamic and lagged feature group. These feature groups were subsequently combined to construct eight input feature configurations. The resulting configurations were evaluated using a tree-based model (LightGBM) and a time-series deep learning model (LSTM) to compare their forecasting performance. The experimental results showed that incorporating temporal features reduced prediction errors in terms of MAE, NMAE, RMSE, and MSE. Overall, LightGBM consistently achieved lower prediction errors than LSTM across all feature configurations. These findings highlight the importance of incorporating temporal dependencies when designing input feature structures for PV power forecasting. - COLLAPSE
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    30 August 2026
  • Short-Term Evaluation of Energy Performance Improvement in an Existing Office Building through Data-Driven Fan Commissioning Control

    기축 업무시설 운영 데이터 기반 팬 커미셔닝 제어 적용에 따른 에너지 성능 개선 단기 평가

    Changhyun Ban, Minho Kim, Dabeen Lee, Sukjoon Oh, Sung Lok Do

    반창현, 김민호, 이다빈, 오석준, 도성록

    Inefficient heating, ventilation, and air-conditioning (HVAC) operation resulting from degraded building envelopes and aging HVAC systems often leads to unnecessary energy consumption. … + READ MORE
    Inefficient heating, ventilation, and air-conditioning (HVAC) operation resulting from degraded building envelopes and aging HVAC systems often leads to unnecessary energy consumption. To address this issue, commissioning has been recognized as an effective approach for improving operational efficiency without requiring equipment replacement. This paper presents a case study of data-driven fan commissioning applied to an existing office building in Seoul, Korea. Analysis of Building Automation System (BAS) operational data revealed continuous air-handling unit (AHU) operation beyond occupancy hours and persistently excessive supply airflow rates, both of which were identified as key sources of operational inefficiency. Based on these findings, a commissioning strategy was developed that reduced AHU operating time by one hour and supply airflow rates by 10%. These modified conditions were defined as the proposed case, whereas the existing operating conditions served as the base case. The results showed that indoor air temperatures remained above the recommended heating setpoint of 20°C in both cases, confirming that thermal comfort was maintained after commissioning. Fan energy consumption decreased by approximately 30.8% and 30.6% on the 4th and 16th floors, respectively, while supply heating energy decreased by approximately 13.8% and 13.5%, respectively. Analysis over an extended period confirmed that these energy-saving trends persisted throughout the entire analysis period. These findings demonstrate that data-driven fan commissioning can effectively reduce HVAC energy consumption in existing buildings while maintaining acceptable indoor thermal conditions. - COLLAPSE
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    30 August 2026
  • Evaluation of Available Façade BIPV Area and Power Generation for ZEB Certification of Apartment Buildings

    ZEB 인증을 위한 공동주택 입면 BIPV 가용 면적 및 발전량 평가 연구

    Ru-Da Lee, Min-Joo Choi, In-Ho Kang, Dong-Su Kim, Jong-Ho Yoon

    이루다, 최민주, 강인호, 김동수, 윤종호

    With the recent strengthening of mandatory zero-energy building certification (ZEBc) requirements, Building-Integrated Photovoltaic (BIPV) systems have become increasingly important as a strategy … + READ MORE
    With the recent strengthening of mandatory zero-energy building certification (ZEBc) requirements, Building-Integrated Photovoltaic (BIPV) systems have become increasingly important as a strategy for overcoming the limited rooftop area of apartment buildings and enhancing energy self-sufficiency. This study systematically quantified façade dimensions according to residential unit type (26, 37, 46, and 55 m2) by analyzing the design drawings of 67 LH apartment complexes in Korea. Standardized module configurations were derived for each façade section to maximize the available installation area, and the corresponding installation capacity and contribution to energy self-sufficiency were evaluated. The façades were classified into five sections: side façades (A), upper and lower window sections (B), inter-window wall sections (C), inter-unit boundary walls (D), and side walls (E). The results showed that the side façade section (A) was the predominant installation area in rental housing, accounting for up to 28.2% of the total available façade area, whereas the upper and lower window sections (B) and inter-window wall sections (C) showed greater utilization potential in sale-type housing. In particular, the 55 m2 sale-type housing accommodated more than three times as many installable PV cells as rental housing, indicating significantly greater power-generation potential. Based on these results, the analysis of energy self-sufficiency according to ZEB certification grade revealed that ZEB Grade 5 could be achieved by partially utilizing rooftop and façade areas, with only 0.04–0.09 kWp of PV capacity required per household. However, for ZEB Grade 2 or higher, the required PV capacity for the 37 and 46 m2 housing types exceeded the capacity that could be accommodated within 100% of the available household façade area, indicating that additional installation areas, such as side walls, are essential. This study provides an initial investigation into expanding BIPV applications through façade standardization. Future research should quantitatively evaluate the power-generation performance and energy potential of each façade section. - COLLAPSE
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    30 August 2026
  • Comparison of Energy Performance by Dehumidification Methods and Operating Strategies for Glass Greenhouse in Winter

    유리 온실의 겨울철 제습 방안 및 운영 전략에 따른 에너지 성능 비교

    Sunhye Mun, Sangjun Park, Seongmin Hong, Jabin Goo, Younghoon Kwak

    문선혜, 박상준, 홍성민, 구자빈, 곽영훈

    This study evaluated the performance and energy efficiency of three dehumidification methods—forced ventilation, heat recovery ventilation (HRV), and stand-alone dehumidifiers—to mitigate high … + READ MORE
    This study evaluated the performance and energy efficiency of three dehumidification methods—forced ventilation, heat recovery ventilation (HRV), and stand-alone dehumidifiers—to mitigate high humidity in glass greenhouses during winter using EnergyPlus simulations. Four relative humidity (RH) setpoints (75%, 80%, 85%, and 90%) were analyzed to establish optimal operational guidelines. Without any dehumidification strategy, the greenhouse experienced high-humidity conditions (RH > 90%) for 20.03% of the total simulation period, while the optimal humidity range for crop growth (60 – 80% RH) was maintained for only 35.86% of the time. The HRV system demonstrated the best performance, reducing the occurrence of high-risk humidity conditions to 0.04 – 0.07% across all setpoints. Forced ventilation also provided stable performance (0.07 – 0.63%), whereas the stand-alone dehumidifier showed limitations in precise humidity control. These results indicate a clear trade-off between maintaining an optimal biological environment and minimizing energy consumption. This study highlights the need for integrated research across architectural, agricultural, and horticultural engineering to develop hybrid control strategies that optimize both crop productivity and energy efficiency in future smart farming systems. - COLLAPSE
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    30 August 2026
  • Analyzing Resident Acceptance of Building- Integrated Photovoltaic(BIPV) in Apartment Housing

    공동주택 건물일체형태양광(BIPV) 주민 수용성 분석

    Eunkyu Cho, Sunghwakh Park, Sookyung Jeong

    조은규, 박성확, 정수경

    This study aims to analyze the relative importance of key factors influencing residents’ acceptance of building-integrated photovoltaics (BIPV) in apartment housing. The … + READ MORE
    This study aims to analyze the relative importance of key factors influencing residents’ acceptance of building-integrated photovoltaics (BIPV) in apartment housing. The Analytic Hierarchy Process (AHP) based survey was administered to residents of Godeok Onbitchae, a Grade 3 zero-energy building (ZEB) apartment complex, to evaluate five upper-level factors—technical, economic, social, environmental, and policy-related factors—and their respective sub-factors. Unlike previous studies based on hypothetical scenarios or general populations, this study examines a residential complex in which BIPV systems have already been installed as part of the building envelope, allowing residents to directly experience the technology in their daily lives. Follow-up questions were also included to assess residents’ experiences, awareness, and perceived policy needs related to BIPV. The results showed that the economic factor was the most important among the upper-level factors, while household electricity bill reduction, apartment management fee reduction, and carbon reduction effects ranked highest among the sub-factors. The findings further suggest that residents regard environmental effects as an important criterion alongside economic benefits. However, the follow-up survey indicated that residents perceived limited economic benefits despite assigning them high importance, highlighting the need for clearer information on actual cost savings. The policy-related findings further identified financial support for installation costs as the most needed measure for improving acceptance. This study contributes to the literature by identifying the key factors influencing residents’ acceptance of BIPV in apartment housing from the residents’ perspective. - COLLAPSE
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    30 August 2026
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