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이현진(Lee Hyun-Jin),김종규(Kim Jong-Kyu),이상남(Lee Sang-Nam),강용혁(Kang Yong-Heack) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
The modeling of the concentrated solar flux is critical to analyzing and designing the systems utilizing concentrated solar energy. Even though some commercial codes are available for the modeling, they inevitably reveal lack of flexibility for various applications. They neither facilitate easy modification of concentrators or receivers nor provide additional information of the concentrated solar flux. Another serious problem in some commercial codes is that their algorithms are outdated. Therefore, the capability to secure the solar flux modeling at will is essential for further advances in solar energy concentration. In the current work, an algorithm based on the Monte Carlo ray-tracing (MCRT) method was developed because it allows the most dominant flexibility for the solar flux modeling. The limb darkening, the reflectance of reflectors, and slope errors of reflector surfaces are considered in the algorithm. For validation, modeling results were examined in terms of convergence according to the number of rays and compared with heat flux measurements at the solar furnace in Korea Institute of Energy Research. Good agreement within 10% average errors suggests that the algorithm should be applicable for modeling the concentrated solar flux. Because the solar furnace is composed of two types of concentrators, parabolic and plane, the algorithm developed can be easily extended to other solar energy concentration systems such as parabolic dish or power tower plants.
이현진(Hyun Jin Lee),김종규(Jong Kyu Kim),이상남(Sang Nam Lee),강용혁(Yong Heack Kang) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.10
태양의 집광 열유속을 이해하는 것은 태양에너지를 이용하는 시스템의 해석과 설계에 중요하다. 본 연구는 우수한 유연성과 확장성을 가진 몬테카를로 광선추적법에 기반하면서 태양주연감광과 반사판 표면 기울기 에러를 고려하는 알고리듬 개발과 이를 통한 태양 열유속 해석에 초점을 맞추고 있다. 검증을 위해 한국에너지기술연구원 태양로에서 측정된 열유속과 비교했을 때, 모델링 결과가 측정 에러 범위인 10% 이내에서 잘 일치하였다. 개발된 모델을 통해 태양로의 집광 성능을 2 mrad 의 추적 정밀도에 최대로 도달 가능한 집광비가 4400 sun 으로 평가하였다. 열유속의 측정 위치에 따른 변화와 수광각에 따른 분포를 통해 화학반응기나 보조집광기 설계에 필요한 상세한 정보를 제공하였다. An understanding of the concentrated solar flux is critical for the analysis and design of solar-energy-utilization systems. The current work focuses on the development of an algorithm that uses the Monte Carlo ray-tracing method with excellent flexibility and expandability; this method considers both solar limb darkening and the surface slope error of reflectors, thereby analyzing the solar flux. A comparison of the modeling results with measurements at the solar furnace in Korea Institute of Energy Research (KIER) show good agreement within a measurement uncertainty of 10%. The model evaluates the concentration performance of the KIER solar furnace with a tracking accuracy of 2 mrad and a maximum attainable concentration ratio of 4400 sun. Flux variations according to measurement position and flux distributions depending on acceptance angles provide detailed information for the design of chemical reactors or secondary concentrators.
채관교(Chai, Kwan-Kyo),이현진(Lee, Hyun-Jin),김종규(Kim, Jong-Kyu),윤환기(Yoon, Hwan-Ki),이상남(Lee, Sang-Nam),강용혁(Kang, Yong-Heack),서태범(Seo, Tae-Beom) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.11
Concentration characteristics of the KIER solar furnace are analyzed with a heat flux measurement technique. Total heat capacity of 40kW was confirmed within 1.04% average error, and the normalized maximum heat flux of 3,452 kW/m2 was proved. Non-Gaussian flux distribution in the vertical direction implies that reflectors should not be random ratherinc lined downwards. Moreover, we characterized flux distribution variations with furnace blind opening ratio, distance from the focal plane, and misalignment of the measurement system. Based on the results, the heat flux distribution can be simply estimated once reflectivity and direct normal insolation values are known. This study will be helpful to the design and the performance evaluation of receivers or chemical reactors.
개방형 체적식 흡수기를 위한 SiC 허니컴 모듈의 성능 평가
채관교(Chai Kwan-Kyo),이현진(Lee Hyun-Jin),윤환기(Yoon Hwan-Ki),이상남(Lee Sang-Nam),한인섭(Han In-Sub),서두원(Seo Doo-Won) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
Daegu Solar Power Tower Plant of a 200 kW thermal capacity uses an open air receiver. An air receiver is generally based on the volumetric receiver concept with porous ceramic absorbers. Because absorber material is important in the volumetric receiver, ceramic materials with excellent thermal conductivity, high solar absorptivity and good thermal stability have been researched. KEER also developed SiC honeycomb absorber modules and evaluated performance of the modules at the KIER solar furnace. For performance evaluation, we made an open volumetric receiver containing the modules and measured the outlet temperature and the efficiency. It is demonstrated that performance of the KEER absorber is comparable to that of a reference absorber developed by DLR.
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.
강용혁(Kang, Yong-Heack),김진수(Kim, Jin-Soo),이상남(Lee, Sang-Nam),윤환기(Yoon, Hwan-Ki),유창균(Yu, Chang-Kyun) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Solar fuel production technology using high-temperature solar furnace was briefly reviewed in this paper. 'Hydrogen' which is known to be the most promising energy carrier in the near future is to be generated environment-friendly from non-carbon resources. Combination of solar furnace operated by concentrated solar energy and high-temperature thermal reactions could be one of the most efficient ways to fulfill this need eventually. Various reaction mechanisms are feasible within a wide spectrum of solar fuel production technology, but intensive research efforts in related key areas need to be taken for successful development and commercialization of the technology.
채관교(Chai Kwan-Kyo),이현진(Lee Hyun-Jin),김종규(Kim Jong-Kyu),윤환기(Yoon Hwan-Ki),이상남(Lee Sang-Nam),강용혁(Kang Yong-Heack),서태범(Seo Tae-Beom) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
Daegu Solar Power Tower Plant of 200 kW thermal capacity was developed for the first time in Korea, 2011. Measurement of the heat flux distribution is essential to evaluate the solar energy concentrated by reflectors and to design a suitable receiver. The flux mapping technique, which uses a radiometer and a diffuse plate, is common for measurement of the heat flux distribution. Because the solar power tower plant has a wide concentration area, the flux mapping technique using a fixed diffuse plate is difficult to apply. Therefore, the flux distribution in the solar power tower plant should be measured by the flux mapping technique using a small moving bar. In this study, we measured flux distributions with the moving-bar system developed at the KIER solar furnace and evaluated its applicability for the solar power tower plant.
조현석(Cho Hyun-seok),이현진(Lee Hyun-jin),김종규(Kim Jong-kyu),이상남(Lee Sang-nam),강용혁(Kang Yong-heack) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
It is important to produce the high temperature and high pressure air for the concentrated solar power system using the combined cycle. In this paper, based on the concept of tubular receiver, we designed two types with focus on radiation loss reduction. These two receivers were tested in the KIER solar furnace of 40 kW thermal capacity. Performance of the two receivers were evaluated and compaed.