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지형복잡도에 따른 국내 육상풍력발전단지의 LCOE와 그 구성요소에 대한 상관도 분석
이건우(Lee Keonwoo),양경부(Yang Kyoungboo),고경남(Ko Kyungnam) 한국태양에너지학회 2024 한국태양에너지학회 논문집 Vol.44 No.2
A study on the relationship between levelized cost of energy (LCOE), its components, and terrain complexity was conducted for Korean onshore wind farms. The 22 wind farms are selected for this study. The actual capital expenditures (CapExs) and operational expenditures (OpExs) of the wind farms are collected from the Data Analysis Retrieval Transfer (DART) system of the Korean Financial Supervisory Service. The capacity factors (CFs) of the wind farms are estimated using the dataset of system marginal price (SMP), renewable energy certificate (REC), and capacities of wind farms. To evaluate terrain complexity, the ruggedness index (RIX) is calculated using the installed wind turbine locations of analyzed onshore wind farms and the numerical terrain contour data. The average RIX is 25.53% that corresponds to mountainous terrain. The correlation analysis is performed to determine the relationship between CF, CapEx, and OpEx in accordance with RIX. The LCOE is calculated from the actual expenditures and estimated CFs. Consequently, the average LCOE is estimated to be 141.04 USD/MWh. The correlation analysis reveals no relationship between LCOE, its components, and RIX.
초박형 카본쉘이 코팅된 금속간 화합물 합금 나노 입자로 구성된 연료전지용 산소 환원 반응 촉매
최현우,고건우,최윤성,민지호,김윤진,박범준,정남기,Hyeonwoo Choi,Keonwoo Ko,Yoonseong Choi,Jiho Min,Yunjin Kim,Sourabh Sunil Chougule,Khikmatulla Davletbaev,Chavan Abhishek Arjun,Beomjun Pak,Namgee Jung 한국재료학회 2024 한국재료학회지 Vol.34 No.4
To fabricate intermetallic nanoparticles with high oxygen reduction reaction activity, a high-temperature heat treatment of 700 to 1,000 ℃ is required. This heat treatment provides energy sufficient to induce an atomic rearrangement inside the alloy nanoparticles, increasing the mobility of particles, making them structurally unstable and causing a sintering phenomenon where they agglomerate together naturally. These problems cannot be avoided using a typical heat treatment process that only controls the gas atmosphere and temperature. In this study, as a strategy to overcome the limitations of the existing heat treatment process for the fabrication of intermetallic nanoparticles, we propose an interesting approach, to design a catalyst material structure for heat treatment rather than the process itself. In particular, we introduce a technology that first creates an intermetallic compound structure through a primary high-temperature heat treatment using random alloy particles coated with a carbon shell, and then establishes catalytic active sites by etching the carbon shell using a secondary heat treatment process. By using a carbon shell as a template, nanoparticles with an intermetallic structure can be kept very small while effectively controlling the catalytically active area, thereby creating an optimal alloy catalyst structure for fuel cells.