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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
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Volume & Issues
Volume 2, Issue 4 - Dec 2006
Volume 2, Issue 3 - Sep 2006
Volume 2, Issue 2 - Jun 2006
Volume 2, Issue 1 - Mar 2006
Selecting the target year
Investigation of the surface structure improvement to reduce the optical losses of crystalline silicon solar cells
Lee Eun-Joo ; Lee Soo-Hong ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 4~8
Reduction of optical losses in crystalline silicon solar cells by surface modification is one of the most important issues of silicon photovoltaics. Porous Si layers on the front surface of textured Si substrates have been investigated with the aim of improving the optical losses of the solar cells, because an anti-reflection coating and a surface passivation can be obtained simultaneously in one process. We have demonstrated the feasibility of a very efficient porous Si AR layer, prepared by a simple, cost effective, electrochemical etching method. Silicon p-type CZ (100) oriented wafers were textured by anisotropic etching in sodium carbonate solution. Then, the porous Si layer were formed by electrochemical etching in HF solutions. After that, the properties of porous Si in terms of morphology, structure and reflectance are summarized. The surface morphology of porous Si layers were investigated using SEM. The formation of a porous Si layer about
thick on the textured silicon wafer result in an effective reflectance coefficient Reff lower than 5% in the wavelength region from 400 to 1000nm. Such a surface modification allows improving the Si solar cell characteristics.
A Study on the Integrated Prefab Building Materials Depending on the Cooling Type of PV Mocdule Backside
Yi So-Mi ; Lee Yong-Ho ; Hong Sung-Min ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 9~15
The application of photovoltaics into building as integrated building components has been paid more attention worldwide. Photovoltaics or solar electric modules are solid state devices, directly converting solar radiation into electricity; the process does not require fuel and any moving parts, and produce no pollutants. And the prefab building method is very effective because the pre- manufactured building components is simply assembled to making up buildings in the construction fields especially the sandwich panel. So, the purpose of this research is to integrated prefab building materials depending on the cooling type of PV modules. It is concluded that the prediction of BIPV system's performance should be based on the more accurate PV module temperature. From the basis of these results on the correlation of temperature and irradiation were obtained.
Installation and Performance Evaluation of 100kWp PV System in Tibet
Kim Seok-Ki ; Yun Jae-Ho ; Lee Jeong-Chul ; Ahn Se-Jin ; Yoon Kyung-Hoon ; Song Jin-Soo ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 16~22
This paper present the performance evaluation of PV systems installed at Tibet area of China in order to identity the key factors that determines system operation at a severe climate conditions and promote the cooperation of PV technology between Korea and China. The installed systems consist of 100kW on-grid connected PV systems, BOS(balance of systems), data acquisition and transmission equipments. The Korea side supplied the solar cell, BOS like as inverter, control box and monitoring system. And the Chinese side assembled solar module, constructed site and built control house. It has been shown that the average radiation per monthly from Tibet is 1.5 times larger than that from Mokpo. Also, radiation time from Tibet is 2hour higher than that from Korea.
Operation Modes of a Power Split Hybrid Electric Vehicle
Ahn Kuk-Hyun ; Cho Sung-Tae ; Lim Won-Sik ; Park Yeong-Il ; Lee Jang-Moo ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 23~27
The power split hybrid powertrain is considered to be one of the most prospective configuration for the hybrid electric vehicle (HEV). Toyota Prius, representing this type of vehicle, showed outstanding performances in fuel efficiency, emission reduction and acceleration. The excellence is largely due to the fact that it utilizes almost all operation modes of HEV. Those modes include ZEV (Zero Emission Vehicle) driving, idle stop, fuel cut-off, power assist, active charging, regenerative braking and so forth. In this paper, a few of the mode operations were simulated using AVL Cruise. Also, control logics to operate the powertrain in each mode were developed. The states of powertrain components were displayed and analyzed. By controlling the three components (engine, motor and generator), it was possible to run the powertrain in several hybrid operation modes.
Numerical Analysis of Wind Turbine Scale Effect by Using Computational Fluid Dynamics
Park Young-Min ; Chang Byeong-Hee ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 28~36
Numerical analysis of wind turbine scale effect was performed by using commercial CFD code, Fluent. For the numerical analysis of wind turbine, the three dimensional Navier-Stokes solver with various turbulence models was tested. As a turbulence mode, the realizable k-e turbulence model was selected for the simulation of wind turbines. To validate the present method, performance of NREL (National Renewable Energy Laboratory) Phase VI wind turbine model was analyzed and compared with its wind tunnel test and blind test data. Using the present method, numerical simulations for various size of wind tunnel models were carried out and characteristics were analyzed in detail. For wind tunnel test model, the size of nacelle may not be scaled down precisely because of available motor. The effect of nacelle size was also computed and analyzed though CFD simulation. The present results showed the good correlations in pre-stall region but much to be improved in post-stall region. In 2006 and 2007, the performance and the scale effect of standard wind turbine model will be tested in KARI(Korea Aerospace Research Institute) LSWT(Low Speed Wind Tunnel) and the present results will be validated with the wind tunnel data.
Development of the Wind Power Forecasting System, KIER Forecaster
Kim Hyun-Goo ; Lee Yung-Seop ; Jang Mun-Seok ; Kyong Nam-Ho ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 37~43
In this paper, the first forecasting system of wind power generation, KIER Forecaster is presented. KIER Forecaster has been constructed based on statistical models and was trained with wind speed data observed at Gosan Weather Station nearby Walryong Site. Due to short period of measurements at Walryong Site for training the model, Gosan wind data were substituted and transplanted to Walryong Site by using Measure-Correlate-Predict(MCP) technique. The results of One to Three-hour advanced forecasting models are consistent with the measurement at Walryong site. In particular, the multiple regression model by classification of wind speed pattern, which has been developed in this work, shows the best performance comparing with neural network and auto-regressive models.
Operation Characteristics of 500W Class Anode Support Planar SOFC Stack
Lim Tak-Hyoung ; Song Rak-Hyun ; Shin Dong-Ryul ; Yang Jung-Il ; Jeong Hun ; Vinke I.C. ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 44~49
A Study on the Performance Evaluation of Double-Layered Catayst MEA
Kim Hong-Gun ; Kang Sung-Soo ; Kwac Lee-Ku ; Kang Young-Woo ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 50~59
An experimental and numerical study is carried out to investigate the performance and the efficiency humidifying Membrane Electrolyte Assembly and having the double-layered catalyst in a fuel cell system which is taken into account the physical and thermal concept. Based on the principals of the problem, the equation of electronic charge conservation equation, gas-phase continuity equation, and mass balance equation are used for the numerical calculation. A unit cell for
MEA is assembled and measured for finding better operational situation. After finding the optimal condition, 10 cell stacked PEMFC is fabricated. For the performance evaluation, V-I and power curves are examined in detail by changing the condition of humidity, temperature, pressure, thickness of catalyst and oxidant. It is found that the power is maximized around 500W at 80A.
Design of adsorption bed for Compact H2 PSA process
Lee Jang-Jae ; Lee Sang-Jin ; Moon Jong-Ho ; Choi Dae-Ki ; Lee Chang-Ha ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 60~68
Thermochemical hydrogen production utilization of M-ferrite (M=Co,Ni,Mn)
Cho Mi-Sun ; Kim Woo-Jin ; Woo Sung-Woong ; Park Chu-Sik ; Kang Kyoung-Soo ; Choi Sang-Il ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 69~74
Heat transfer enhancement of metal hydride
for hydrogen storage
Bae Sang-Chul ; Yang Yang ; Masanori Monde ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 75~80
The effective thermal conductivities of
[TL-492] with hydrogen and helium have been examined. Experiment results show that pressure has great influence on effective thermal conductivity in low pressure range [below 0.5 MPa]. And that influence decreases rapidly with increase of gas pressure. The reason is at low pressure, the mean free path of gas becomes greater than effective thickness of gas film which is important to the heat transfer mechanism in this research. And, carbon fibers have been used to try to enhance the poor thermal conductivity of TL-492. Three types of carbon fibers and three mass fractions have been examined and compared. Naturally, the highest effective thermal conductivity has been reached with carbon fiber which has highest thermal conductivity, and highest mass fraction. This method has acquired 4.33 times higher thermal conductivity than pure metal hydrides with quite low quantity of additives, only 0.99 wt% of carbon fiber. This is a good result comparing to other method which can reach higher effective thermal conductivity but needs much higher mass fraction of additives too.
Output Characteristic Analysis of Small Hydropower Plant
Park Wan-Soon ; Lee Chul-Hyung ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 81~85
The output performance characteristics for surveyed sites were analyzed, using developed model. It consists of two main parts, the deciding flow duration characteristic of river and performance prediction model to estimate the output characteristics of small hydropower plants. As a result, It was found that the flowrate concerning with 25% of time ratio on flow duration curve can be selected to design flowrate of small hydropower plants, and the output characteristics of small hydropower plants having overflow dam are different from large scale hydropower plants.
Heat Transfer Performance of Pond loop type Heat Exchanger for Ground Source Heat Pump using Extruding Ground Wafer
Park Geun-Woo ; Kim Jin-Sang ; Lee Eung-Youl ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 86~93
Experimental Investigation on the Enhancement of Gas Hydrate Formation for tile Solid Transportation of Natural Gas
Kim Nam-Jin ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 94~101
] solid hydrate contains up to
of natural gas, depending on pressure and temperature. Such large volume of natural gas hydrate can be utilized to store and transport large quantity of natural gas in a stable condition. So, in the present investigation, experiments carried out for the formation of natural gas hydrate governed by pressure, temperature, and gas compositions, etc.. The results show that the equilibrium pressure of structure II natural gas hydrate) is approximately 65% lower and the solubility is approximately three times higher than structure I methane hydrate). Also, the subcooling conditions of the structure I and II must be above 9K and 11K in order to form hydrate rapidly regardless of gas components, but the pressure increase is more advantageous than the temperature decrease in order to increase the gas consumption. And utilizing nozzles for spraying water in the form of droplets into the natural gas dramatically reduces the hydrate formation time and increases its solubility at the same time.
Investigation on the Practical Use of Gas Hydrate in Gas Industry
Kwon Ok-Bae ; Sin Chang-Hun ; Park Seung-Su ; Han Jeong-Min ; Lee Jeong-Hwan ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 102~107
In Japan, research and development were undertaken on gas hydrate-side industrial processes associated with power generation system connections that may particularly be necessary to develop gas hydrated technology-based industrial systems. In so doing, data and engineering technologies useful n formulating guidelines on design of practical process were accumulated. In addition, basic research into theoretical evidence were carried out to promote and support the development of technological elements for those processes. In basic research designed to promote and support the research and development of elemental technologies, microanalyses were conducted to understand the decomposition mechanism of mixed gas hydrate. Moreover, measurement technologies that can be applied in industrial processes, such as numerical analyses and concentration measurement, were examined. Japan has developed a highly efficient gas hydrate formation process using micro-bubbles with a tubular reactor. Higher formation rate over conventional systems has been obtained by the process. As mentioned above, the technical problems were clarified and the economics were studied from a view point of the NGH technology in this study. The results can be applied for utilization and must contribute to popularization of gas hydrate production.
The Analysis on Power Development Options in Remote Islands and It's Implementation
Rhee Chang-Ho ; Jo In-Seung ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 108~117
This paper focus on power development options for remote islands. Recently, in accordance with progress in distributed generation technologies including renewable energy sources, many options are possible as power development option for island. At first we estimate generation cost by generation technology then recommend and suggest some countermeasures and implementation for institutional improvement.
Process Development of Pyrolysis Liquefaction for Waste Plastics
Nho Nam-Sun ; Shin Dae-Hyun ; Park Sou-Won ; Lee Kyong-Hwan ; Kim Kwang-Ho ; Jeon Sang-Goo ; Cho Bong-Gyu ;
Journal of the Korean society for New and Renewable Energy, volume 2, issue 2, 2006, Pages 118~125
The target of this work was the process development of demonstration plant to produce the high quality alternative fuel oil by the pyrolysis of mixed plastic waste. In the first step of research, the bench-scale units of 70 t/y and the pilot plant of 360 t/y had been developed. Main research contents in this step were the process performance test of pilot plant of 360 ton/year and the development of demonstration plant of 3,000 t/y, which was constructed at Korea R & D Company in Kimjae City. The process performance of pilot plant of 360 t/y showed about 80% yield of liquid product, which was obtained by both light gas oil(LGO) and heavy gas oil(HGO), The boiling point range distribution of LO product that was mainly consisting of olefin components in PONA group appeared at between that of commercial gasoline and kerosene. On the other hand, HO product was mainly paraffin and olefin components and also appeared at upper temperature distribution range than commercial diesel. Gas product showed a high fraction of
product like LPG composition, but also a high fraction of
and CO by probably a little leak of process.