• Title/Summary/Keyword: Solar Furnace

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Review on the Solar Fuel Production Technology Using High-Temperature Solar Furnace (초고온 태양열을 이용한 태양연료 생산기술 연구동향)

  • Kang Yong-Heack;Kim Jin-Soo;Lee Sang-Nam;Yoon Hwan-Ki;Yu Chang-Kyun
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.06a
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    • pp.408-411
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    • 2005
  • 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.

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Characteristic of the Radiation Heat Flux Distribution for the KIER Solar Furnace (KIER 태양로의 열유속 분포 특성)

  • Chai, Kwan-Kyo;Lee, Hyun-Jin;Kim, Jong-Kyu;Yoon, Hwan-Ki;Lee, Sang-Nam;Kang, Yong-Heack;Seo, Tae-Beom
    • 한국태양에너지학회:학술대회논문집
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    • 2011.11a
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    • pp.74-79
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    • 2011
  • 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 $kW/m^2$ was proved. Non-Gaussian flux distribution in the vertical direction implies that reflectors should not be random rather inclined 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.

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Heat-Flux Analysis of Solar Furnace Using the Monte Carlo Ray-Tracing Method (몬테카를로 광선추적법을 이용한 태양로의 열유속 해석)

  • Lee, Hyun-Jin;Kim, Jong-Kyu;Lee, Sang-Nam;Kang, Yong-Heack
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.10
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    • pp.989-996
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    • 2011
  • 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.

Development of Flux Mapping Technique for the Solar Power Tower Plant (타워형 태양열발전을 위한 열유속 분포 측정기술 개발)

  • Chai, Kwan-Kyo;Lee, Hyun-Jin;Kim, Jong-Kyu;Yoon, Hwan-Ki;Lee, Sang-Nam;Kang, Yong-Heack;Seo, Tae-Beom
    • 한국태양에너지학회:학술대회논문집
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    • 2012.03a
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    • pp.274-279
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    • 2012
  • 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.

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Design and Performance Evaluation of Solar Air Receivers (공기식 태양열 흡수기의 설계 및 성능평가)

  • Cho, Hyun-Seok;Lee, Hyun-Jin;Kim, Jong-Kyu;Lee, Sang-Nam;Kang, Yong-Heack
    • Journal of the Korean Solar Energy Society
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    • v.32 no.spc3
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    • pp.207-212
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    • 2012
  • 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, we designed two types of tubular receivers to heat up the compressed air and provided their preliminary experimental results for performance evaluation and further improvements. The developed receivers are in a square cavity shape surrounded by flow conduits for easy scale-up and radiation loss reduction. The two receivers were tested with 5 bar air in the KIER solar furnace and evaluated in terms of the outlet temperature and the efficiency.

Performance Evaluation of SiC Honeycomb Modules Used for Open Volumetric Solar Receivers (개방형 체적식 흡수기를 위한 SiC 허니컴 모듈의 성능 평가)

  • Chai, Kwan-Kyo;Lee, Hyun-Jin;Kim, Jong-Kyu;Yoon, Hwan-Ki;Lee, Sang-Nam;Han, In-Sub;Seo, Doo-Won
    • 한국태양에너지학회:학술대회논문집
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    • 2012.03a
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    • pp.120-125
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    • 2012
  • 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. KIER 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 KIER absorber is comparable to that of a reference absorber developed by DLR.

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Design and Performance Evaluation of Solar Air Receivers (공기식 태양열 흡수기의 설계 및 성능평가)

  • Cho, Hyun-Seok;Lee, Hyun-Jin;Kim, Jong-Kyu;Lee, Sang-Nam;Kang, Yong-Heack
    • 한국태양에너지학회:학술대회논문집
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    • 2012.03a
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    • pp.280-285
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    • 2012
  • 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 40kW thermal capacity. Performance of the two receivers were evaluated and compared.

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Dynamic Properties of the Inorganic Binder Based on Blast Furnace Slag and Polysilicon Sludge ratio (고로슬래그와 폴리실리콘 슬러지의 비율에 따른 무기결합재의 역학적 특성)

  • Lim, Jeong-Geun;Lee, Ji-Hwan;Park, Hee-Gon;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2014.11a
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    • pp.146-147
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    • 2014
  • The environmental pollution problem the globally related to global warming arises, the demand for the solar power generation increases. But is generated sludge about 2tons in order to produce 1ton in the solar power generation used main material polysilicon. In this way, the arising sludge there is not method recycling and it is all discarded. Therefore, in this research, cement is not used dynamic properties tries to be analyze inorganic binder based on blast furnace slag and polysilicon sludge ratio. The appropriate replacement ratio of the experimental result polysilicon sludge was to be 8%.

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Investigation of Firing Conditions for Optimizing Aluminum-Doped p+-layer of Crystalline Silicon Solar Cells

  • Lee, Sang Hee;Lee, Doo Won;Shin, Eun Gu;Lee, Soo Hong
    • Current Photovoltaic Research
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    • v.4 no.1
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    • pp.12-15
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    • 2016
  • Screen printing technique followed by firing has commonly been used as metallization for both laboratory and industrial based solar cells. In the solar cell industry, the firing process is usually conducted in a belt furnace and needs to be optimized for fabricating high efficiency solar cells. The printed-Al layer on the silicon is rapidly heated at over $800^{\circ}C$ which forms a layer of back surface field (BSF) between Si-Al interfaces. The BSF layer forms $p-p^+$ structure on the rear side of cells and lower rear surface recombination velocity (SRV). To have low SRV, deep $p^+$ layer and uniform junction formation are required. In this experiment, firing process was carried out by using conventional tube furnace with $N_2$ gas atmosphere to optimize $V_{oc}$ of laboratory cells. To measure the thickness of BSF layer, selective etching was conducted by using a solution composed of hydrogen fluoride, nitric acid and acetic acid. The $V_{oc}$ and pseudo efficiency were measured by Suns-$V_{oc}$ to compare cell properties with varied firing condition.

Development of Methane Decomposition Reactor for Hydrogen Production Using Solar Thermal Energy (수소생산을 위한 태양열 이용 메탄 분해 반응기 개발)

  • Kim, Haneol;Kim, Jongkyu
    • New & Renewable Energy
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    • v.17 no.2
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    • pp.40-49
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    • 2021
  • This paper explains the development process of methane decomposition to hydrogen and carbon black using solar thermal energy. It also demonstrates the advantages and disadvantages of five different reactors for each development stage, including the reactor's experimental results. Starting with the initial direct heating type reactor, the indirect heating type reactor was developed through five modifications. The 40-kWth solar furnace installed at the Korea Institute of Energy Research was used for the experiment. In the experiment using the developed indirect heating reactor, an 89.0% methane to hydrogen conversion rate was achieved at a methane flow rate of 40 L/min, obtained at about twice the flow rate compared to previous advanced studies.