• 제목/요약/키워드: Alternative energy source

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A novel ceramic GEM used for neutron detection

  • Zhou, Jianrong;Zhou, Xiaojuan;Zhou, Jianjin;Jiang, Xingfen;Yang, Jianqing;Zhu, Lin;Yang, Wenqin;Yang, Tao;Xu, Hong;Xia, Yuanguang;Yang, Gui-an;Xie, Yuguang;Huang, Chaoqiang;Hu, Bitao;Sun, Zhijia;Chen, Yuanbo
    • Nuclear Engineering and Technology
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    • v.52 no.6
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    • pp.1277-1281
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    • 2020
  • A novel ceramic Gas Electron Multiplier (GEM) has been developed to meet the demand of high counting rate for the neutron detection which is an alternative to 3He-based detector at China Spallation Neutron Source (CSNS). An experiment was performed to measure the neutron transmittance of ceramic-GEM and FR4-GEM at the small angle neutron scattering (SANS) instrument. The result showed the ceramic-GEM has higher transmittance and less self-scattering especially for cold neutrons. One single ceramic GEM could give a gain of 102-104 in the mixture gas of Ar and CO2 (90%:10%) and its energy resolution was about 27.7% by using 55Fe X ray of 5.9 keV. A prototype has been developed in order to investigate the performances of the ceramic GEM-based neutron detector. Several neutron beam tests, including detection efficiency, spatial resolution, two-dimensional imaging, and wavelength spectrum, were carried out at CSNS and China Mianyang Research Reactor (CMRR). The results show that the ceramic GEM-based neutron detector is a good candidate to measure the high intensity neutrons.

PERSPECTIVES OF NUCLEAR HEAT AND HYDROGEN

  • Lee, Won-Jae;Kim, Yong-Wan;Chang, Jong-Hwa
    • Nuclear Engineering and Technology
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    • v.41 no.4
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    • pp.413-426
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    • 2009
  • Nuclear energy plays an important role in world energy production by supplying 6% of the world's current total electricity production. However, 86% of the energy consumed worldwide to produce industrial process heat, to generate electricity and to power the transportation sector still originates in fossil fuels. To cope with dwindling fossil fuels and climate change, it is clear that a clean alternative energy that can replace fossil fuels in these sectors is urgently required. Clean hydrogen energy is one such alternative. Clean hydrogen can play an important role not only in synthetic fuel production but also through powering fuel cells in the anticipated hydrogen economy. With the introduction of the high temperature gas-cooled reactor (HTGR) that can produce nuclear heat up to $950^{\circ}C$ without greenhouse gas emissions, nuclear power is poised to broaden its mission beyond electricity generation to the provision of nuclear process heat and the massive production of hydrogen. In this paper, the features and potential of the HTGR as the energy source of the future are addressed. Perspectives on nuclear heat and hydrogen applications using the HTGR are discussed.

Development of Renewable Energy Source in Mongolia: Biodiesel (몽골지역의 신재생에너지 발굴: 바이오디젤)

  • Hong, Yeon Ki
    • Journal of Institute of Convergence Technology
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    • v.3 no.1
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    • pp.9-14
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    • 2013
  • Recently, the development of renewable energy sources in Mongolia has been needed due to climate change and air pollution in Ulaanbaatar as rapid economic growth. Biodiesel can be considered as an alternative fuel for petroleum based diesel in order to decrease air pollution in Ulaanbaatar because of its no emission of particle materials from internal combustion engine in automobile. Rapeseed oil having low cloud point and pour point was suggested as a promising raw material for biodiesel production in Mongolia. Considering high population density and severe air pollution by particle materials and SOx in Ulaanbaatar, prior supplying site of biodiesel in Mongolia was the capital region including Ulaanbaatar. In the production of biodiesel in Mongolia, adsorption process was a effective alternative to washing process for the removal of residual alkali catalyst and reactants due to long winter time in Mongolia. For the stable supply of biodiesel, subsidy and no tax policy is needed in the early stage of biodiesel supply in Mongolia.

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Exhaust Emissions Characteristics of a Small Diesel Engine using Rice-bran Oil (미강유 적용 소형 디젤엔진의 배기배출물 특성)

  • 나우정;유병규;정진도
    • Journal of Biosystems Engineering
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    • v.23 no.2
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    • pp.125-134
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    • 1998
  • It seems possible, by use of vegetable oils, to solve the pollution problem caused by the exhaust gas from diesel-engine vehicles. Recently vegetable oils has received considerable attention as an alternative and clean energy source to the foreseeable depletion of world oil supplies. The objective of this study is to experimentally investigate the characteristics of exhaust emissions of a small diesel engine using light oil, rice-bran oil, heated rice-bran oil, rice-bran oil treated with ultrasonic energy. SO$_2$ emission from the pure and the treated rice-bran oils was not detected at speeds hgher than 1,800 rpm while that from the light oil was detected at all the speeds at 4/4 load. NOx emission form these vegetable oils was generally higher compared to that from the light oil for most of the test conditions. tendency opposite to that of NOx emission. The data obtained in this experiment may be applicable for the desist of small diesel engine using the alternative fuels.

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Analysis of Hydraulics Power according to Changable Design Conditions for Francis Turbines (프란시스 수차의 설계조건 변동에 따른 수력학적 해석)

  • Choi, J.S.;Kim, I.S.;Moon, C.J.;Kim, O.S.
    • Proceedings of the KIPE Conference
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    • 2005.07a
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    • pp.690-692
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    • 2005
  • Among many other alternative energy resources, small scale hydropower has been brought into attention as a reliable source of energy today, which had been relatively neglected since 1960s. Present low head of Francis turbines and small scale hydro turbines, however, have limitations in the minimum required head and flow rate for efficient operation. This study attempts to develope the Francis turbine which is expected to run efficiently even in very low head and small flow rate, so that the limitations on the conventional small scale hydropower could be alleviated and competition with other alternative energy sources in the changable design conditions could be attained. The Francis turbine of a new concept was designed based on changable design conditions, hydrodynamics and theory of power transmission.

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Analysis of Hydraulics Power Characteristics According to Changable Design Conditions for Francis Turbines (프란시스 터어빈의 설계조건 변동에 따른 수력학적 특성해석)

  • Kim, O.S.;Choi, J.S.;Kim, I.S.
    • Journal of Power System Engineering
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    • v.9 no.3
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    • pp.39-43
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    • 2005
  • Among many other alternative energy resources, small scale hydropower has been brought into attention as a reliable source of energy today, which had been relatively neglected since 1960s. Present low head of Francis turbines and small scale hydroturbines, however, have limitations in the minimum required head and flow rate for efficient operation. This study attempts to develope the Francis turbine which is expected to run efficiently even in very low head and small flow rate, so that the limitations on the conventional small scale hydropower could alleviated and competition with other alternative energy sources in the changable design conditions could attained. The Francis turbine of a new concept was designed based on changable design conditions, hydrodynamics and theory of power transmission. The result of the study shows that two stages runner is more efficient, cheaper in construction, faster responding, and easier maintaining than single stage runner of Francis turbine

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The Field Test of bankfiltration(including alluvial and riverbed deposits) Source Heat Pump Cooling & Heating System (강변여과수(충적층 및 하상)를 이용한 열펌프 냉난방시스템의 실증연구)

  • Hwang, Ki-Sup;Jung, Woo-Sung;Ahn, Young-Sub
    • Proceedings of the SAREK Conference
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    • 2006.06a
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    • pp.1186-1190
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    • 2006
  • Rising in important of alternative energy due to the recenfly high oil price and environment problem. Application of alternative energy has become higher than before. In this study, facility test of Geothermal energy to bankfiltration was examined appliying changwon pumping well. Initial installation cost was efficiently saved by connecting a heat pump system to pumping well in changwon bankfiltration site. A falling-off in efficiency of heat pump was free due to the bankfiltration that is rare for the temperature fluctuation. Therefore, Heat soure as bankfiltration system solve the existing facilities problems of geothermal heat pump system.

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High Efficiency DC-DC Converter for Fuel Cell System (연료전지 계통 연계형 고효율 DC-DC 컨버터)

  • Oh, Eun-Tae;Yoon, Soo-Young;Lee, Yoon-Jae;You, Gwang-Min;Chae, Hyung-Jun;Han, Byung-Moon;Lee, Jun-Young
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.12
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    • pp.2410-2415
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    • 2009
  • Studying for environmental friendly and efficient energy source is now actively under way on because problems like environmental pollution and exhaust of natural resources are in issue. Fuel Cell which is an alternative energy source has low voltage and high current characteristic, therefore boost up voltage converter and DC-AC converter is required to use as a common power source. In this paper, DC-DC converter which has high efficient and high power density is proposed and verified by experimental result.

Evaluation on the Cooling Performance of Geothermal-energy Using Heat Pump System in Mixed-use Residential Building (주상복합 건축물에 적용된 지열이용 히트펌프 시스템의 냉방성능 평가)

  • Kim, Yong-Shik;Kim, Jung-Heon;Hwang, Kwang-Il
    • Journal of the Korean Solar Energy Society
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    • v.26 no.4
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    • pp.9-16
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    • 2006
  • Geothermal-energy has been getting popular as a natural energy source for green buildings these days. Public building with gross area more than $3000m^2$, planned after March, 2005, should spend about 5% of total building cost for equipment run by natural energy source (e.g. geothermal, solar heat, solar power, etc) according to renewable energy promotion law in Korea. As a result geothermal-energy using heat pump system is emerging as a effective alternative for realistic and economic plan although design guidelines and construction code for the system is in progress and technical data is far from sufficient. The quantitative analysis on the performance of geothermal-energy using heat pump system is insufficient for appropriate design of it. In this paper, cooling performance of geothermal-energy using heat pump system of residential and retail etc. mixed-use building has been analyzed on the basis of temperature comparison between inlet and outlet of heat exchangers of the operating system. Additionally, dry-bulb temperature and relative humidity have been measured and analyzed together as an index of indoor thermal environment.

Solid Waste from Swine Wastewater as a Fuel Source for Heat Production

  • Park, Myung-Ho;Kumar, Sanjay;Ra, ChangSix
    • Asian-Australasian Journal of Animal Sciences
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    • v.25 no.11
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    • pp.1627-1633
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    • 2012
  • This study was to evaluate the feasibility of recycling the solids separated from swine wastewater treatment process as a fuel source for heat production and to provide a data set on the gas emissions and combustion properties. Also, in this study, the heavy metals in ash content were analyzed for its possible use as a fertilizer. Proximate analysis of the solid recovered from the swine wastewater after flocculation with organic polymer showed high calorific (5,330.50 kcal/kg) and low moisture (15.38%) content, indicating that the solid separated from swine wastewater can be used as an alternative fuel source. CO and NOx emissions were found to increase with increasing temperature. Combustion efficiency of the solids was found to be stable (95 to 98%) with varied temperatures. Thermogravimetry (TG) and differential thermal analysis (DTA) showed five thermal effects (four exothermic and one endothermic), and these effects were distinguished in three stages, water evaporation, heterogeneous combustion of hydrocarbons and decomposition reaction. Based on the calorific value and combustion stability results, solid separated from swine manure can be used as an alternative source of fuel, however further research is still warranted regarding regulation of CO and NOx emissions. Furthermore, the heavy metal content in ash was below the legal limits required for its usage as fertilizer.