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김하늘,김종규,Kim, Haneol,Kim, Jongkyu 한국교통대학교 융복합기술연구소 2018 융ㆍ복합기술연구소 논문집 Vol.8 No.1
In this study, design and manufacture of LFR (Linerar Fresnel Reflector) system was performed for solar thermal absorption cooling. The LFR system was designed considering the expansion and convenience to be installed according to the cooling capacity of the applicable building. Twelve LFR modules with a total reflection area of $204m^2$ were installed. The automatic tracking system was applied to track the sun during the daytime.
바이오메탄 분해 수소생산을 위한 태양열이용 반응기 개발 및 실험
김하늘(Haneol Kim),이상남(Sangnam Lee),김학주(Hakjoo Kim),김종규(Jongkyu Kim) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
본 연구에서는 태양열을 이용하여 바이오 가스 내의 메탄을 수소와 카본 블랙으로 분해하기 위해 단계적으로 반응기를 개발하고 실험을 수행하였다. 초기 쿼츠가 장착된 직접가열식 반응기를 개발하였으나 카본 침착에 따른 쿼츠 파손이 발생하였다. 이에 단계적 개선을 통해 최종적으로 컴팩트 캐비티가 적용된 원통형의 간접가열식 반응기를 개발하였다. 메탄 분해 시 반응 온도 및 활성화 에너지를 낮추기 위해 두께 9.5 mm인 NiCrAl 메달 폼 지지체에 바인더를 통해 카본 파우더가 코팅된 촉매를 사용하였다. 집광된 태양열을 반응기에 공급하기 위해 헬리오스타트, 블라인드, 접시형 집광기로 구성된 한국에너지기술연구원의 40 kWth 태양로를 사용하였다. 반응기를 이용한 실험을 통해 메탄 유량이 20L/min, 40 L/min일 때 각각 평균 96.7%, 89.0%의 메탄-수소 전환율을 달성하였다.
LFR 태양열발전과 PV 발전시스템의 경제성 비교분석 연구
김하늘(Haneol Kim),박진규(Jingyu Park),이상남(Sangnam Lee),김종규(Jongkyu Kim) 한국신재생에너지학회 2016 신재생에너지 Vol.12 No.4
In this study, power generation and an economic evaluation of photovoltaic (PV) systems and LFR thermal power plant in Riyadh, Kingdom of Saudi Arabia were performed using the SAM program provided by NREL (National Renewable Energy Laboratory) and the calculation results were compared. The designed power capacity of the two systems was 1 MWe at 12 PM on June. Three different PV commercial models were selected and the design conditions of the LFR power plant were referred to the eCare Solar Thermal Project of CNIM (Construction Industrielles Mediterrancee). In conclusion, the annual power generation of PV is higher than the LFR due to the higher solar irradiation source of POA. On the other hand, the LFR showed more power generation at June and September because of the high optical efficiency and high DNI at a circulation ratio of 10. The levelized cost of energy (LCOE) and capital cost of LFR were 45% and 54% higher than those of the PV, respectively. In the case of a 50% construction cost reduction of the LFR due to growth of the market in the future, the LCOE of LFR becomes 5% higher than the PV but the capital cost of the LFR is 8% lower than the PV.
김하늘(Haneol Kim),이상남(Sangnam Lee),이상직(Sang Jik Lee),김종규(Jongkyu Kim) 한국신재생에너지학회 2021 신재생에너지 Vol.17 No.1
In this study, the optical properties, heat transfer capabilities and chemical reaction performance of a methane thermal decomposition reactor using solar heat as a heat source were numerically analyzed on the basis of the cavity shape. The optical properties were analyzed using TracePro, a Monte Carlo ray tracing-based program, and the heat transfer analysis was performed using Fluent, a CFD program. An indirect heating tubular reactor was rotated at a constant speed to prevent damage by the heat source in the solar furnace. The inside of the reactor was filled with a porous catalyst for methane decomposition, and the outside was insulated to reduce heat loss. The performance of the reactor, based on cavity shape, was calculated when solar heat was concentrated on the reactor surface and methane was supplied into the reactor in an environment with a solar irradiance of 700 W/㎡, a wind speed of 1 m/s, and an outdoor temperature of 25°C. Thus, it was confirmed that the heat loss of the full-cavity model decreased to 13% and the methane conversion rate increased by 33.5% when compared to the semi-cavity model.