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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 7, Issue 4 - Dec 2011
Volume 7, Issue 3 - Sep 2011
Volume 7, Issue 2 - Jun 2011
Volume 7, Issue 1 - Mar 2011
Selecting the target year
Design Study of Fuel Supply System for 5MW-class Bio Gasturbine by Using Food Waste Water
Hur, Kwang-Beom ; Park, Jung-Keuk ; Yun, Eun-Young ; Lee, Jung-Bin ;
Journal of the Korean society for New and Renewable Energy, volume 7, issue 2, 2011, Pages 10~17
DOI : 10.7849/ksnre.2011.7.2.010
Korea is the 11th largest energy consumption country and 96% of its total energy consumption depends on imports from overseas. Therefore it is a very important task to secure renewable energy sources which can reduce both the carbon-dioxide emission and dependency on overseas energy imports. Among the various renewable energy sources, organic wastes are important sources. In Korea, 113 million toe of methane is generated from organic wastes annually, but only 3.7% is effectively used for energy conversion. Thus, it is very important to make better use of organic wastes, especially for power generation. The goals of this project are to develope the fuel supplying system of Bio Gasturbine (GT) for 5MW-class co-generation system. The fuel supplying system mainly consists of
removal system, Bio Gas compression system, Siloxane removal system and moisture separating systems. The fuel requirement of 5MW-class GT is at around 60% of
(<30 ppm), Siloxane(<10 mg/
) and supply pressure (> 25 bar) from biogas compressor. Main mechnical charateristics of Bio Gasturbine system have the specific performance; 1) high speed turbine speed (12,840 rpm) 2) very clean emmission NOx (<50 ppm) 3) high efficiency of energy conversion rate. This paper focuses on the development of design technology for food waste biogas pretreatment system for 5MW-class biogas turbine. The study also has the plan to replace the fuel of gas turbine and other distributed power systems. As the increase of bioenergy, this system help to contribute to spread more New & Renewable Energy and the establishment of Renewable Portfolio Standards (RPS) for Korea.
On Determining the Size and the Timing of the Capacity Expansion in PV Module Manufacturing: Management Flexibility in Real Options Model
Kim, Kyung-Nam ; SonU, Suk-Ho ;
Journal of the Korean society for New and Renewable Energy, volume 7, issue 2, 2011, Pages 18~27
DOI : 10.7849/ksnre.2011.7.2.018
Management flexibility to adapt its future actions in response to altered future market conditions can expand the value of an investment opportunity by improving its upside potential without the change in the downside losses. Module manufacturers in solar industry continuously have to decide how much and when its production capacity should be expanded with regards to the demand in the global markets. Either over- or under-investment can cause sunk and/or opportunity costs to the module manufacturers. Option of exercising the additional investments only on favorable opportunities can increase total value of the investment. This paper analyzes the case which shows that the expansion of production capacity with more expandibility can have more value than the rigid plan of capacity expansion. The expansion option value is equivalent to KRW 38.286 billion, thus switching the negative NPV of the initial investment opportunity into the positive value. High volatility and the high growth in the cashflows as the major business features of the renewable energy provide condition where real options can play the crucial role in increasing the investment value as well as in determining the size and timing of capacity expansion in the course of capital budgeting process.
The Long-term Operating Evaluation of the Grid Connected Photovoltaic System
Kim, Eui-Hwan ; Kang, Seng-Won ; Kim, Jae-Eon ;
Journal of the Korean society for New and Renewable Energy, volume 7, issue 2, 2011, Pages 28~35
DOI : 10.7849/ksnre.2011.7.2.028
Recently, photovoltaic systems have been devolved into much larger systems up to MW-scale. Photovoltaic industry participants give their focus on power generation capability of photovoltaic modules because their benefits can be decided from the amount of generation. The information on long-term performance change of photovoltaic modules helps to estimate the amount of power generation and evaluate the economic cost-benefits. Long-term performance of a PV system has been analyzed with operation data for 12 years from 1999 to 2010. In the first year, the amount of yearly power generation was 57.7 MWh with 13.2% capacity factor. In 2007, the amount of yearly generation was 44.3 MWh with 10.14% capacity factor, and in 2010, the amount was decreased down to 38.1 MWh with 8.7% capacity factor. The result means that long-term capacity factor has been 4.5% decreased for 12 years and that the amount of generation has been decreased 34.0% for 12 years which is 2.8 % per year. The latter capacity factor has been decreased faster than 0.20%, the average rate for 10 years. The performance decrease of the PV system is meant to be accelerated. The decrease of performance and utilization is due to aged deterioration of photovoltaic modules and lowering conversion efficiency of PCS.
Technical Development Status and Market Prospects for High Altitude Wind Power Generation System
Kang, Seung-Won ; Gil, Doo-Song ; Park, Dong-Su ; Jung, Won-Seoup ; Kim, Eui-Hwan ;
Journal of the Korean society for New and Renewable Energy, volume 7, issue 2, 2011, Pages 36~42
DOI : 10.7849/ksnre.2011.7.2.036
The wind speed at the altitude around 300 m is much higher and less variable than at the altitude around 80 m which is the same height of the MW class tower turbine's hub height. The wind power density is increased 0.37 W/
per meter at the altitude around 6 to 7 km and 0.25 W/
per meter at the altitude around 80 to 500 m. There are two types of power generation systems using lifting bodies. The one is that The generator is installed in the ground station and stretched into the lifting body through the tether. The other is that the generator is installed in the lifting body and stretched into the ground station through the tether. Many kinds of lifting bodies are also researched in the world, called kites, wings, single or twin aerostat, and so on. This article introduced the technical development status and the market prospects of the high altitude wind power generation system all over the world in detail.
Comparative Validation of WindCube LIDAR and Scintec SODAR for Wind Resource Assessment - Remote Sensing Campaign at Jamsil
Kim, Hyun-Goo ; Kim, Dong-Hyuk ; Jeon, Wan-Ho ; Choi, Hyun-Jeong ;
Journal of the Korean society for New and Renewable Energy, volume 7, issue 2, 2011, Pages 43~50
DOI : 10.7849/ksnre.2011.7.2.043
The only practical way to measure wind resource at high-altitude over 100 m above ground for a feasibility study on a high-rise building integrated wind turbine might be ground-based remote sensing. The remote-sensing campaign was performed at a 145 m-building roof in Jamsil where is a center of metropolitan city Seoul. The campaign aimed uncertainty assessment of Leosphere WindCube LIDAR and Scintec MPAS SODAR through a mutual comparison. Compared with LIDAR, the data availability of SODAR was about 2/3 at 550 m altitude while both showed over 90% under 400 m, and it is shown that the data availability decrease may bring a distortion of statistical analysis. The wind speed measurement of SODAR was fitted to a slope of 0.92 and
of 0.90 to the LIDAR measurement. The relative standard deviation of wind speed difference and standard deviation of wind direction difference were evaluated to be 30% and 20 degrees, respectively over the whole measurement heights.
Measurement and Analysis of Wind Energy Potential in Kokunsando of Saemankeum
Shim, Ae-Ri ; Choi, Yeon-Sung ; Lee, Jang-Ho ;
Journal of the Korean society for New and Renewable Energy, volume 7, issue 2, 2011, Pages 51~58
DOI : 10.7849/ksnre.2011.7.2.051
Saemankeum is well known for its high speed wind, and it is known that the blueprint of a future city around Saemankeum, including new industrial complex, has been planned. As a result, large-scale offshore wind farm, on the basis of the measurement of wind resource for a long time, can be considered, so that generated electricity can be used to meet the energy demand near the wind farm. Wind speed in Kokunsando of Saemankeum is measured and analyzed with its statistical distribution and wind directions. The probability of wind power resource over Kokunsando of Saemangeum is reviewed with the measured data in one island of Kokunsando. According to measured data, the shape and scale factor of Weibull distribution of wind speed are obtained, and then power density is analyzed as well. Through this study, it is clear that the Saemangeum area has a fluent and abundant wind power source to develop the wind farm in Korea.
Study on the Aerodynamics and Control Characteristics of 5 MW Wind Turbine
Tai, Fengzhu ; Kang, Ki-Won ; Lee, Jang-Ho ;
Journal of the Korean society for New and Renewable Energy, volume 7, issue 2, 2011, Pages 59~69
DOI : 10.7849/ksnre.2011.7.2.059
5MW wind turbine is regarded as a promising system for offshore wind farms in the western sea of Korean. And the wind turbine is developed in many companies but not much information is known about it. In this study, aerodynamics and control characteristics depending on several control methods is reviewed on 5MW wind turbine, in which configuration data of the turbine are used from the previous study of NREL. For the calculations, GH_Bladed, which is certificated software by GL, is used and compared with data from FAST code of NREL. This study shows that how much power production, and aerodynamic performances and loads can be obtained with different controls in the operation of 5MW wind turbine, which is expected to be useful in the design of the wind turbine system.