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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 4, Issue 4 - Dec 2008
Volume 4, Issue 3 - Sep 2008
Volume 4, Issue 2 - Jun 2008
Volume 4, Issue 1 - Mar 2008
Selecting the target year
Study on the Dissolution Behavior of Liquide
Hydrate Injected at the Intermediate Depth of the Ocean
Kim, Nam-Jin ; Park, Sung-Seek ; Seo, Hyan-Min ;
Journal of the Korean society for New and Renewable Energy, volume 4, issue 2, 2008, Pages 12~20
Calculations for the dissolution behavior of liquid CO2 droplets released in the East Sea and the Clipperton Clarion from a moving ship and a fixed pipeline have been carried out in order to estimate the CO2 dissolution characteristics in the ocean. The results show that the injection of liquid CO2 from a moving ship in a high temperature point is an effective method for dissolution. Also, it is noted that the ultimate plume generated from CO2 bubbles repeatsand shrinking due to the peeling from a fixed pipeline, and the presence of hydrate layer on a liquid CO2 droplet acts as a resistant layer in dissolving liquid CO2.
Biogas Production and Utilization Technologies from Organic Waste
Heo, Nam-Hyo ; Lee, Seung-Heon ; Kim, Byeong-Ki ;
Journal of the Korean society for New and Renewable Energy, volume 4, issue 2, 2008, Pages 21~30
Anaerobic digestion (AD) is the most promising method of treating and recycling of different organic wastes, such as OFMSW, household wastes, animal manure, agro-industrial wastes, industrial organic wastes and sewage sludge. During AD, i.e. degradation in the absence of oxygen, organic material is decomposed by anaerobes forming degestates such as an excellent fertilizer and biogas, a mixture of carbon dioxide and methane. AD has been one of the leading technologies that can make a large contribution to producing renewable energy and to reducing
and other GHG emission, it is becoming a key method for both waste treatment and recovery of a renewable fuel and other valuable co-products. A classification of the basic AD technologies for the production of biogas can be made according to the dry matter of biowaste and digestion temperature, which divide the AD process in wet and dry, mesophilic and thermophilic. The biogas produced from AD plant can be utilized as an alternative energy source, for lighting and cooking in case of small-scale, for CHP and vehicle fuel or fuel in industrials in case of large-scale. This paper provides an overview of the status of biogas production and utilization technologies.
The Optimum Control Study for Improving Efficiency of the Small Hydropower Generation in Water Pipe
Hong, Jeong-Jo ; Rim, Dong-Heui ; Kim, Soo-Sang ;
Journal of the Korean society for New and Renewable Energy, volume 4, issue 2, 2008, Pages 31~38
Using a surplus head in presented water supply pipes, we have studied to improve the operating efficiency of small hydro generator, which was chosen for a test model with 00 hydro power plant. With regard to power control and countermeasure of water hammer impact, Finally we have represented the optimal control method through the synthetical analysis of existing system symptoms, operation efficiency, the effect of water hammer impact and system configuration.
Partial Oxidation of Methane Over Ceria-promoted Catalysts Derived from Ni-substituted Hydrotalcite
Lee, Seung-Hwan ; Kim, Mi-So ; Kwak, Jung-Hun ; Lim, Tae-Hoon ; Nam, Suk-Woo ; Hong, Seong-Ahn ; Yoon, Ki-June ;
Journal of the Korean society for New and Renewable Energy, volume 4, issue 2, 2008, Pages 39~44
Partial oxidation of methane was carried out by ceria-promoted Ni-substituted hydrotalcite-derived catalysts (
-HTlc ; x=
) in a fixed-bed reactor. The Ce/Ni ratio of 0.3/3 in the catalyst showed the best catalytic activity but the Ce/Ni ratio became higher above 0.3/3, the catalyst became less active in short-term tests. No ceria promoted catalyst was started to decrease
conversion after 20 h but the Ce/Ni ratio 0.3/3 catalyst was kept its stability in long-term tests.
A Study on the Economic Evaluation with Super-Micro Fuel Cell Home Cogeneration System by Varying the Floor Area of House
Roh, Chul-Woo ; Kim, Min-Soo ;
Journal of the Korean society for New and Renewable Energy, volume 4, issue 2, 2008, Pages 45~51
The fuel cell system is environment-friendly and energy efficient system. Especially, the fuel cell cogeneration systems providing heat and electricity to buildings have been developed and applied to a lot of sites in the world to cope with the global warming and
emission problem. This paper presents the result of study on the economic evaluation with super-micro fuel cell (SMFC) cogeneration system by varying the floor area (
) of the house, whose system capacity ranges from 0.10 kWe to 0.50 kWe. The electricity demand, heat demand, saved energy cost, and the simple pay-back period have been simulated for the various capacities of fuel cell cogeneration system. As a result, this study suggests the fuel cell system’s capacity decision strategy for a given house area. Contrary to conventional design assumptions, the smaller capacity fuel cell cogeneration system is appropriate for the house of large floor area to defense the progressive electricity tax, and the larger capacity fuel cell cogeneration system is appropriate for the house of small floor area to sell the electricity.
A Study on the Feasibility of the Three Prospective Types of HEV
Lee, Dong-Jun ; Lee, Ye-Ji ; Heo, Eun-Nyeong ;
Journal of the Korean society for New and Renewable Energy, volume 4, issue 2, 2008, Pages 52~60
More people have become interested in hybrid vehicles - which have been heralded as environmentally friendly automobiles - recently as the opening of domestic hybrid vehicle market draws near. Since gasoline, diesel and LPG hybrid vehicles will be produced, a need exists to conduct economic feasibility study of each vehicle type. This research analyzed projected benefits of these hybrid vehicles based on the 1600cc model. There are two categories of benefits: 1) reduced fuel costs for the owners of the vehicles; and 2) reduced environmental pollution cost. We conducted a sensitivity analysis and estimated the domestic consumer fuel costs based on the international oil prices of 100USD, 150USD, and 200USD per barrel. The analysis showed savings of 2 to 4 million Won in fuel cost and 1 to 2 million Won in environmental pollution cost; therefore, the hybrid vehicles are not economically feasible if they are between 3 to 5 million Won more expensive than the conventional internal combustion engine vehicles.
The Economic Aspect of Gas Hydrate Development
Kim, Hwa-Young ; Lee, Dong-Jun ; Heo, Eun-Nyeong ;
Journal of the Korean society for New and Renewable Energy, volume 4, issue 2, 2008, Pages 61~67
The price to import natural gas continues to rise, as well as the rate of its domestic consumption. This research examined the economic feasibility of domestically developing and producing gas hydrate to substitute imported natural gas. Today, the industry still lacks the technology to commercially produce gas hydrate. However, if the gas hydrate is able to be commercially produced domestically and replace imported natural gas, the annual economic benefit for the Republic of Korea would be 211 - 833 USD/ton. Gas hydrate is rated as a high value investment by the gas industry since the potential annual profit can reach over 150USD/ton. The commercial value of gas hydrate development will increase as long as the natural gas market continues to expand and its consumption increase remains steady. With further development of technology, one can anticipate an even higher expected return on the investment.
A Novel Analysis Of Amorphous/Crystalline Silicon Heterojunction Solar Cells Using Spectroscopic Ellipsometer
Ji, Kwang-Sun ; Eo, Young-Ju ; Kim, Bum-Sung ; Lee, Heon-Min ; Lee, Don-Hee ;
Journal of the Korean society for New and Renewable Energy, volume 4, issue 2, 2008, Pages 68~73
It is very important that constitution of good hetero-junction interface with a high quality amorphous silicon thin films on very cleaned c-Si wafer for making high efficiency hetero-junction solar cells. For achieving the high efficiency solar cells, the inspection and management of c-Si wafer surface conditions are essential subjects. In this experiment, we analyzed the c-Si wafer surface very sensitively using Spectroscopic Ellipsometer for <
> and u-PCD for effective carrier life time, so we accomplished <
> value 43.02 at 4.25eV by optimizing the cleaning process which is representative of c-Si wafer surface conditions very well. We carried out that the deposition of high quality hydrogenated silicon amorphous thin films by RF-PECVD systems having high density and low crystallinity which are results of effective medium approximation modeling and fitting using spectroscopic ellipsometer. We reached the cell efficiency 12.67% and 14.30% on flat and textured CZ c-Si wafer each under AM1.5G irradiation, adopting the optimized cleaning and deposition conditions that we made. As a result, we confirmed that spectroscopic ellipsometry is very useful analyzing methode for hetero-junction solar cells which need to very thin and high quality multi layer structure.
Contact Resistance Analysis of High-Sheet-Resistance-Emitter Silicon Solar Cells
Ahn, Jun-Yong ; Cheong, Ju-Hwa ; Do, Young-Gu ; Kim, Min-Seo ; Jeong, Ji-Weon ;
Journal of the Korean society for New and Renewable Energy, volume 4, issue 2, 2008, Pages 74~80
To improve the blue responses of screen-printed single crystalline silicon solar cells, we investigated an emitter etch-back technique to obtain high emitter sheet resistances, where the defective dead layer on the emitter surface was etched and became thinner as the etch-back time increased, resulting in the monotonous increase of short circuit current and open circuit voltage. We found that an optimal etch-back time should be determined to achieve the maximal performance enhancement because of fill factor decrease due to a series resistance increment mainly affected by contact and lateral resistance in this case. To elucidate the reason for the fill factor decrease, we studied the resistance analysis by potential mapping to determine the contact and the lateral series resistance. As a result, we found that the fill factor decrease was attributed to the relatively fast increase of contact resistance due to the dead layer thinning down with the lowest contact resistivity when the emitter was contacted with screen-printed silver electrode.
Optimization of Cement Manufacturing Process for Heat Source Application of Automobile Shredder Residue
Oh, Sea-Cheon ; Kwon, Woo-Teck ; Kim, Soo-Ryong ;
Journal of the Korean society for New and Renewable Energy, volume 4, issue 2, 2008, Pages 81~86
Rotary kiln in cement work has been evaluated for a wide variety of organic wastes such as wood, used tyres, plastic wastes and automobile shredder residue (ASR). However the presence of chlorine hampers the use of ASR as fuel in rotary kiln. Therefore, the behavior characteristics of chlorine components in rotary kiln should be considered to develop an effective method for ASR treatment to recovery energy resources. The aim of this paper is to present the chlorine control system applied to a cement manufacturing process for ASR use as an alternative fuel. In this work, the simulation of bypass unit and cyclones for chlorine control in rotary kiln has been studied and compared with the operation results of field test.
Wind Tunnel Test for Scaled Wind Turbine Model (Scale effect correction)
Cho, Tae-Hwan ; Kim, Yang-Won ; Park, Young-Min ; Chang, Byeong-Hee ;
Journal of the Korean society for New and Renewable Energy, volume 4, issue 2, 2008, Pages 87~93
Wind tunnel test for the 12% scaled model of NREL Phase VI wind turbine was conducted in KARI low speed wind tunnel for
. The 1st and 2nd test was designed to find out the wind tunnel test method for the blade manufacturing accuracy and surface treatment method by using the composite and aluminum blades. And the 3rd test was designed to study the scale effect. The chord extension method which was used for Bo-105 40% scaled model was adapted for scale effect correction. Test results shows that the chord extension method works well for the torque slope but the maximum torque for scaled model is about 8% below than the real scale model. New correction method to correct this offset was proposed.
Experimental Investigation on the Change of Water Discharge Capability of Sluice Caisson for Tidal Power Plant Placed on the Rubble Mound
Lee, Dal-Soo ; Oh, Sang-Ho ; Lee, Jin-Hak ; Park, Woo-Sun ; Cho, Hyu-Sang ; Eum, Hyun-Min ;
Journal of the Korean society for New and Renewable Energy, volume 4, issue 2, 2008, Pages 94~104
The change of water discharge capability of sluice caisson for tidal power plant according to installation of the rubble mound was investigated by performing laboratory experiment. The experiment was carried out in an open channel flume with a great care to measure flow rate and water level in the flume accurately. Eight different sluice caisson models were used in the experiment. The water discharge capabilities of seven sluice models decreased with respect to the placement of the rubble mound, while increased for only one sluice model. On average, the values of discharge coefficient decreased by approximately 10% when the sluice models were placed on the rubble mound. It is concluded that the shape of the rubble mound can affect the water discharge capability of the sluice caisson, so that its shape should be significantly considered in the design of the sluice caisson, especially when it is deployed in a site of relatively deeper depth.