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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean society for New and Renewable Energy
Journal Basic Information
Journal DOI :
The Korean Society for New and Renewable Energy
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Volume & Issues
Volume 9, Issue 4 - Dec 2013
Volume 9, Issue 3 - Sep 2013
Volume 9, Issue 2 - Jun 2013
Volume 9, Issue 1 - Mar 2013
Selecting the target year
Microwave-Assisted Acid-Hydolysis of Laminaria Japonica and its Ethanol Productivity: Comparison with Conventional Heating
Song, Myoung-Ki ; Na, Choon-Ki ;
Journal of the Korean society for New and Renewable Energy, volume 9, issue 2, 2013, Pages 5~14
DOI : 10.7849/ksnre.2013.9.2.005
The efficiency of microwave-assisted acid hydrolysis of seaweeds for the production of ethanol was investigated and its effect on hydrolysis into reducing sugar and fermentation into ethanol evaluated as compared with those by conventional heating. A brown seaweed, Laminaria japonica (10-100g/L) was hydrolysed under dilute acidic condition (0.5N
) with two sorts of heating: microwave irradiation for
and conventional heating for 10-60min. Microwave-assisted hydrolysis was shown to be more efficient. A similar range of reducing sugar and ethanol yields as with the conventional autoclave heating procedure(
) was observed, but it was obvious that production of ethanol from microwave-assisted hydrolysis had a 3 times faster reaction rate leading to very short production times, lower energy consumption/loss than from the conventional heating mode, and higher biomass loading without significant reducing ethanol yield, thus microwave-assisted acid hydrolysis is a potential alternative method for more effective hydrolysis of Laminaria japonica.
Analysis of Very High Resolution Solar Energy Based on Solar-Meteorological Resources Map with 1km Spatial Resolution
Jee, JoonBum ; Zo, Ilsung ; Lee, Chaeyon ; Choi, Youngjean ; Kim, Kyurang ; Lee, KyuTae ;
Journal of the Korean society for New and Renewable Energy, volume 9, issue 2, 2013, Pages 15~22
DOI : 10.7849/ksnre.2013.9.2.015
The solar energy are an infinite source of energy and a clean energy without secondary pollution. The global solar energy reaching the earth's surface can be calculated easily according to the change of latitude, altitude, and sloped surface depending on the amount of the actual state of the atmosphere and clouds. The high-resolution solar-meteorological resource map with 1km resolution was developed in 2011 based on GWNU (Gangneung-Wonju National University) solar radiation model with complex terrain. The very high resolution solar energy map can be calculated and analyzed in Seoul and Eunpyung with topological effect using by 1km solar-meteorological resources map, respectively. Seoul DEM (Digital Elevation Model) have 10m resolution from NGII (National Geographic Information Institute) and Eunpyeong new town DSM (Digital Surface Model) have 1m spatial resolution from lidar observations. The solar energy have small differences according to the local mountainous terrain and residential area. The maximum bias have up to 20% and 16% in Seoul and Eunpyung new town, respectively. Small differences are that limited area with resolutions. As a result, the solar energy can calculate precisely using solar radiation model with topological effect by digital elevation data and its results can be used as the basis data for the photovoltaic and solar thermal generation.
A Study on Feasibility of the Phosphoric Paste Doping for Solar Cell using Newly Atmospheric Pressure Plasma Source
Cho, I-Hyun ; Yun, Myoung-Soo ; Jo, Tae-Hoon ; Rho, Junh-Young ; Jeon, BuII ; Kim, In-Tae ; Choi, Eun-Ha ; Cho, Guang-Sup ; Kwon, Gi-Chung ;
Journal of the Korean society for New and Renewable Energy, volume 9, issue 2, 2013, Pages 23~29
DOI : 10.7849/ksnre.2013.9.2.023
Furnace and laser is currently the most important doping process. However furnace is typically difficult appling for selective emitters. Laser requires an expensive equipment and induces a structural damage due to high temperature using laser. This study has developed a new atmospheric pressure plasma source and research atmospheric pressure plasma doping. Atmospheric pressure plasma source injected Ar gas is applied a low frequency (a few 10 kHz) and discharged the plasma. We used P type silicon wafers of solar cell. We set the doping parameter that plasma treatment time was 6s and 30s, and the current of making the plasma is 70 mA and 120 mA. As result of experiment, prolonged plasma process time and highly plasma current occur deeper doping depth and improve sheet resistance. We investigated doping profile of phosphorus paste by SIMS (Secondary Ion Mass Spectroscopy) and obtained the sheet resistance using generally formula. Additionally, grasped the wafer surface image with SEM (Scanning Electron Microscopy) to investigate surface damage of doped wafer. Therefore we confirm the possibility making the selective emitter of solar cell applied atmospheric pressure plasma doping with phosphorus paste.
A Study of Characterization of Multi-Crystalline Silicon Solar Cell Module using by RIE and Wet Texturing for BIPV
Seo, Il-Won ; Yun, Myung-Soo ; Jo, Tae-Hoon ; Son, Chan-Hee ; Cha, Sung-Ho ; Lee, Sang-Du ; Kwon, Gi-Chung ;
Journal of the Korean society for New and Renewable Energy, volume 9, issue 2, 2013, Pages 30~39
DOI : 10.7849/ksnre.2013.9.2.030
Multi-crystalline silicon solar cells is not exist a specific crystal direction different from single crystalline silicon solar cells. In functional materials, therefore, isotropic wet etching of mc-Si solar cell is easy the acid solution rather than the alkaline solution. The reflectance of wet texturing process is about 25% and the reflectance of RIE texturing process is achieved less than 10%. In addition, wet texturing has many disadvantages as well as reflectance. So wet texturing process has been replaced by a RIE texturing process. In order to apply BIPV, RIE and wet textured multi-crystalline silicon solar cell modules was manufactured by different kind of EVA sheet. Moreover, in case of BIPV, the short circuit current characteristics according to the angle of incidence is more important, because the installation of BIPV is fixed location. In this study, we has measured SEM image and I-V curve of RIE and wet textured silicon solar cell and PV module. Also we has analyzed quantum efficiency characteristics of RIE and wet textured silicon solar cell for PV modules depending on incidence angle.
A Case Study on the Technology Tree Methodology of Energy R&D
Kang, Geun Young ; Yun, Ga-Hye ; Kim, Donghwan ;
Journal of the Korean society for New and Renewable Energy, volume 9, issue 2, 2013, Pages 40~50
DOI : 10.7849/ksnre.2013.9.2.040
Government spending on research and development increased continuously is much more important to decision-making methodology for rational investment. Rely on a group of minority experts in the application of a general methodology, a tipping effect occur in specific technology field or difficult balanced procedure and objective control to maintain. This paper presents a qualitative-quantitative methodology to avoid such risks by utilizing Technology-Tree pertaining to energy R&D planning of the government Energy Technology Development program. Especially Energy Technology Development program "energy storage system" is applied to the analysis of Technology-Tree, mapping and analysis of existing government-supported projects during the recent 5 years, is derived essential missing elements of the technology value chain. This study suggests that significant evidence is utilized for improving efficiency of government R&D budget considering the importance of technology, domestic research-based and so forth, could be used to implement the R&D project planning.
A Detection Method of Grid Voltage for Grid Support Operation of an Inverter-based Renewable Energy Generation System
Ahn, Hyun-Chul ; Song, Seung-Ho ;
Journal of the Korean society for New and Renewable Energy, volume 9, issue 2, 2013, Pages 51~57
DOI : 10.7849/ksnre.2013.9.2.051
The Grid code is being strengthen as increase of renewable energy ratio. Especially, the grid connection regulations are continuously being updated for stable operation of power grids. Static grid support and Dynamic grid support must make an accurate measure at Grid connected point because they needs control algorithm individually. It has to exactly measure voltage including switching ripple at the output of the inverter generating system. In addition, it is necessary to have an accurate voltage measurement when the situation rapidly changing the grid impedance is caused by the input of serial impedance of transformer and line impedance as well as Grid Fault Device. In this paper, We propose a new detection method of grid voltage to calculate accurately the r.m.s voltage of the grid connection point along the standard required by the low voltage regulation. We verified performance through simulation grid fault device.