• Research Article

    Development of Bricks for Utilizing Discarded Fallen Leaf and Environmental Assessment

    폐기성 낙엽을 활용하기 위한 벽돌 개발 및 환경성 평가

    Byeon, Ji-Yeong, Kim, Min-Kyeong, Lee, Yeon-Hwi, Oh, Kang-Won, Chang, Seong-Jin

    변지영, 김민경, 이연휘, 오강원, 장성진

    This study explores the potential of recycling urban fallen leaves into eco-friendly building materials by developing compressed leaf bricks using natural adhesives … + READ MORE
    This study explores the potential of recycling urban fallen leaves into eco-friendly building materials by developing compressed leaf bricks using natural adhesives such as dextrin, albumin, gelatin, and casein. The research targeted Jinju City, South Korea, which produces an annual leaf waste volume of 31.41 tons. Fallen leaves were dried, processed, and compressed into bricks measuring 190×90×57 mm, adhering to KS L 4201 standards. Durability and combustion tests evaluated their physical and environmental performance. Albumin and gelatin-based bricks exhibited superior water resistance, suitable for temporary structures such as small agricultural facilities and lightweight partitions. Combustion tests revealed low emissions of formaldehyde (HCHO) and total volatile organic compounds (TVOC), ensuring environmental safety. Transportation simulations showed that compressing leaves into bricks reduced carbon emissions by 69.6% compared to transporting uncompressed leaves. These findings demonstrate the potential of leaf bricks in mitigating urban waste while providing an eco-friendly construction material. Future studies will focus on optimizing large-scale production processes and comparing the compressive strength and water absorption of leaf bricks with conventional clay bricks. - COLLAPSE
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    28 February 2025

  • Research Article

    Solar Radiation Calculation for Double Layer Window Pane Considering High Performance Film

    고성능 필름적용을 고려한 이중 창호의 일사량 계산

    Chung, Woong-June, Kim, Min-Hyeong, Kim, Kwang-Woo

    정웅준, 김민형, 김광우

    This paper presents a refined methodology for calculating solar radiation through double-layered window systems, addressing the limitations of conventional approaches outlined in … + READ MORE
    This paper presents a refined methodology for calculating solar radiation through double-layered window systems, addressing the limitations of conventional approaches outlined in ISO 9050 and EN410. While these standards employ fixed transmittance values for glass layers, leading to inaccuracies in complex fenestration systems with varying films and coatings, the proposed method incorporates directional transmittance. By considering the distinct transmittance values of each glass layer depending on the direction of solar radiation, this method achieves enhanced accuracy. A comprehensive analysis of diverse double layered window configurations with varying film types and positions was conducted. Comparisons between the proposed method and conventional approaches revealed significant discrepancies in solar radiation calculations, particularly in configurations with internal reflective coatings. Furthermore, a notable difference was observed in the calculated radiant heat exchange from the interior to the exterior environment. The enhanced accuracy of the proposed method offers valuable implications for energy-efficient building design and performance evaluation, enabling more precise calcluation of solar heat gain and optimization of window system design. - COLLAPSE
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    28 February 2025

  • Research Article

    Development of a SketchUp-based PV System Performance Evaluation Tool

    SketchUp 기반의 태양광 시스템 발전 성능 평가 툴 개발

    Park, Jun-Hwan, Baek, Seung-Hyo

    박준환, 백승효

    The adoption of photovoltaic (PV) systems in buildings has recently increased to support the implementation of Zero Energy Buildings. The placement of … + READ MORE
    The adoption of photovoltaic (PV) systems in buildings has recently increased to support the implementation of Zero Energy Buildings. The placement of PV systems on building facades is partly determined by the building design. Since the energy performance of PV systems varies with their placement, it is crucial to consider their performance during the building design process to meet targeted energy goals. This study developed a tool to evaluate the energy performance of PV systems installed on buildings using the 3D architectural design software SketchUp. A comprehensive process was established by integrating SketchUp’s modeling capabilities with PV performance calculation features. Two key algorithms were developed: one for calculating the PV energy performance and another for analyzing shading effects caused by surrounding structures. These algorithms were implemented as a SketchUp plugin using Ruby within the Visual Studio development environment. To validate the tool’s accuracy, its performance calculations were compared with results from SAM, a representative PV performance simulation tool, under two scenarios in the Seoul region: shading caused by adjacent PV systems and shading caused by surrounding buildings. The results showed that, when adjacent PV system shading was considered, the CV (RMSE) of AC energy generation was up to 1.8%. For shading caused by surrounding buildings, the CV (RMSE) was up to 1.48%, confirming the tool’s high accuracy. - COLLAPSE
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    28 February 2025
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