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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean society for New and Renewable Energy
Journal Basic Information
Journal DOI :
The Korean Society for New and Renewable Energy
Editor in Chief :
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
Computational Flow Analysis on Wind Profile Change Projected to a Wind Turbine Behind Saemangeum Seawall
Woo, Sang-Woo ; Kim, Hyun-Goo ;
Journal of the Korean society for New and Renewable Energy, volume 9, issue 1, 2013, Pages 6~11
DOI : 10.7849/ksnre.2013.9.1.006
Jeollabuk-do has announced a future plan for the Saemangeum Wind Farm which includes the installation of fourteen wind turbines in a single line, located 500m back from the Saemangeum Seawall. It is anticipated as a positive effect that, for sea breeze blowing toward land, the average wind speed could be accelerated and the wind speed distribution could be uniformized by dint of the seawall, an upstream structure of the turbines. At the same time it is also anticipated as a negative effect that the strength of wind turbulence could be increased due to the flow separation generated at the back end of the seawall. According to the results of the computational fluid dynamics analysis of this paper, it has been observed that, at the 50m zone on the road surface located at the uppermost part of the Saemangeum Seawall, the average wind speed has been accelerated by approximately 6~7% and that wind shear has been decreased by 70%, but this positive effect disappears in the zone situated beyond the 100m from the back end of the seawall. It has also been observed that flow separation exists to a limited extent only below the bottom of the blade-sweeping circle and, furthermore, does not extend very far downstream of the wind. As a conclusion, it can be said that the seawall neither positively nor negatively affects the proposed Saemangeum Seawall Wind Farm layout.
Calibration Equation for Nacelle Anemometer Derived by LIDAR Measurements
Kim, Hyun-Goo ; An, Hae-Joon ; Yang, Seung-Joo ; Park, Woo-Jae ; Kim, Seok-Woo ;
Journal of the Korean society for New and Renewable Energy, volume 9, issue 1, 2013, Pages 12~16
DOI : 10.7849/ksnre.2013.9.1.012
The nacelle anemometer mounted behind the blade roots of a wind turbine measures distorted wind speed comparable with free-stream wind because of the wake effects caused dependent upon the operation of the wind turbine and the rotation of its blades. The field campaign was carried out to measure free-stream wind speed at a height identical to the height of the nacelle anemometer by deploying a ground-based remote-sensing equipment, LIDAR. It is derived that a third-order polynomial equation for correcting wind speed measured by the nacelle anemometer to undistorted free-stream wind speed incident to a wind turbine. It is anticipated that the derived correction equation enables wind speed measured by the nacelle anemometer to be used as a precise input for a wind turbine performance test and for developing an active control logic.
Performance Measurement of the Eddy Current Heat Generator with Different Array of Permanent Magnets
Yun, Teak-Han ; Son, Young-Woo ; Lee, Jang-Ho ;
Journal of the Korean society for New and Renewable Energy, volume 9, issue 1, 2013, Pages 17~24
DOI : 10.7849/ksnre.2013.9.1.017
Eddy Current is one of ways to make heat using rotational energy of wind turbine rotor. Four difference arrays of permanent magnets around rotor surface are used to generate heat using eddy current in this study. For the evaluation of heating performance, new test rig is prepared to measure water flow and temperatures in the inlet and outlet of the eddy current heat generator. In the test, torque and rotational speed are also measured in the motor driven system, and evaluated if the torque is matched with it of wind turbine rotor or not. It will be shown that the eddy current heat generator can be applied to real urban wind energy systems in this study.
Fermentation of Pentose and Hexose Derived from Cellulosic Food Wastes by Mixed Yeast
Jeong, Seung-Mi ; Kim, Yong-Jin ;
Journal of the Korean society for New and Renewable Energy, volume 9, issue 1, 2013, Pages 25~32
DOI : 10.7849/ksnre.2013.9.1.025
It is indispensable to increase the conversion rate of a reducing sugars such as pentose and hexose derived from cellulosic wastes for a highly efficient bioethanol fermentation from food wastes. The saccharification liquid from cellulosic substrates such as vegetable food wastes contained lots of hexose like glucose and pentose like xylose. Since Saccharomyces-based yeasts could not convert xylose to bioethanol, Pichia stipitis which could directly ferment xylose to ethanol was chosen. After selecting Saccharomyces coreanus and P. stipitis, fermentation characteristics by mixture of two yeasts were investigated. As a result, it was verified the production of ethanol was enhanced by the co-fermentation, although there were somewhat differences between the fermentation characteristics by the aeration methods. Moreover, the consumption of pentose, hexose and disaccharide was obviously observed, and aeration in the process of fermentation seemed to stimulate the activity of P. stipitis.
Study on Review Sustainability Criteria and Key Approaches for Biofuel
Kim, Jae-Kon ; Yim, Eui-Soon ; Jung, Choong-Sub ;
Journal of the Korean society for New and Renewable Energy, volume 9, issue 1, 2013, Pages 33~43
DOI : 10.7849/ksnre.2013.9.1.033
The objective of this paper is to provide a review on the latest development on the main initiative and approaches for the sustainability criteria for biofuels. A large number of national and international initiative lately experienced rapid development in the review of the biofuels targets announced in the European Union (EU), United States (US) and other countries worldwide. The global biofuel targets are likely to have a strong impact on land use and agricultural markets. Although biofuels production provides new options for using agricultural crops, there are environmental, social and economic concerns associated with biofuel production. The diversity of feedstock, large number of biofuels pathway an their complexity lead to a high uncertainty over the greenhouse gas (GHG) performances of biofuels, in terms of GHG emission reductions compared to the fossil fuels, expecially if land use change is involved. This paper describes an overview of current status of ongoing certification initiative in Europe and worldwide for biofuels sustainability. It also provides mandatory requirements as part of an sustainability scheme in EU, United Kingdom, US and international approaches and should be reviewed to introduce based on global trends in Korea.
Analysis of the Characteristics of the Tidal Current Power Generation System Using PMSG and Water Tunnel
An, Won-Young ; Lee, Seok-Hyun ; Kim, Gun-Su ; Lee, Kang-Hee ; Jo, Chul-Hee ;
Journal of the Korean society for New and Renewable Energy, volume 9, issue 1, 2013, Pages 44~50
DOI : 10.7849/ksnre.2013.9.1.044
In order to analyze the characteristics of tidal current power generation system, we measured the output power according to the stream velocity by a water tunnel system and a simulation in MATLAB/Simulink. The water tunnel system consisted of impeller tidal flow transducer and PMSG with rotor in the water. The simulation consisted of PMSG, the tidal current turbine, and back-to-back converter. Also, we simulated the characteristics of output power according to the change of blade length and angular velocity.
Ammonia Decomposition Over Tantalum Carbides of Hydrogen Fuel Cell
Choi, Jeong-Gil ;
Journal of the Korean society for New and Renewable Energy, volume 9, issue 1, 2013, Pages 51~59
DOI : 10.7849/ksnre.2013.9.1.051
Tantalum carbide crystallites which is to be used for
fuel cell has been synthesized via a temperature-programmed reduction of
. The resultant Ta carbide crystallites prepared using two different heating rates and space velocity exhibit the different surface areas. The
uptake has a linear relation with surface area, corresponding to an oxygen capacity of
. Tantalum carbide crystallites are very active for hydrogen production form ammonia decomposition reaction. Tantalum carbides are as much as two orders of magnitude more active than Pt/C catalyst (Engelhard). The highest activity has been observed at a ratio of
, suggesting the presence of electron transfer between metals and carbon in metal carbides.
An Experimental Study on the Estimation of Wind Force Coefficient of Floating Type Photovoltaic Energy Generation System
Lee, Young-Geun ; Lee, Nam-Hyung ; Joo, Hyung-Joong ; Yoon, Soon-Jong ;
Journal of the Korean society for New and Renewable Energy, volume 9, issue 1, 2013, Pages 60~68
DOI : 10.7849/ksnre.2013.9.1.060
In recent years, green house effect related natural disasters occur throughout the world. Carbon dioxide, mainly comes from the fossil fuel burning, is suspected to be the cause of green house effect. To reduce the emission of carbon dioxide, we need to find alternative energy resources such as photovoltaic energy. In this paper, the basic characteristics of wind force coefficient on a PV panel installed on the floating type PV energy generation system are investigated though the two-dimensional wind tunnel tests. Test variables included the angle of PV panel, direction of wind, number of rows of PV panel and attached or not attached frame. Based on the results obtained through the wind tunnel tests, it was found that the wind force coefficient can be used as a preliminary data in the design of the structure.