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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Solar Energy Society
Journal Basic Information
Journal DOI :
The Korean Solar Energy Society
Editor in Chief :
Volume & Issues
Volume 25, Issue 4 - Dec 2005
Volume 25, Issue 3 - Sep 2005
Volume 25, Issue 2 - Jun 2005
Volume 25, Issue 1 - Mar 2005
Selecting the target year
single crystal thin film for solar cell development and its solar cell application
Lee, Sang-Youl ; Hong, Kwang-Joon ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 1~11
The stoichiometric mixture of evaporating materials for the
single crystal thin film was prepared from horizontal furnace. Using extrapolation method of X-ray diffraction patterns for the polycrystal
, it was found tetragonal structure whose lattice constant
, respectively. To obtain the
single crystal thin film,
mixed crystal was deposited on throughly etched GaAs(100) by the HWE(Hot Wall Epitaxy) system. The source and substrate temperature were
respectively. The crystalline structure of
single crystal thin film was investigated by the double crystal X-ray diffraction(DCXD). Hall effect on this sample was measured by the method of Van der Pauw and studied on carrier density and mobility depending on temperature. From Hall data, the mobility was likely to be decreased by impurity scattering in the temperature range 30 K to 100 K and by lattice scattering in the temperature range 100 K to 293 K. The temperature dependence of the energy band gap of the
obtained from the absorption spectra was well described by the Varshni's relation,
. The open-circuit voltage, short current density, fill factor, and conversion efficiency of
heterojunction solar cells under
illumination were found to be 0.51V,
, 0.76 and 14.3 %, respectively.
Study on Methane Steam Reforming utilizing Concentrated Solar Energy -Part 1. In search of the best reaction condition for steam reforming of methane-
Kim, Ki-Man ; Nam, Woo-Seok ; Han, Gui-Young ; Kang, Yong-Heack ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 13~19
The reaction of steam reforming of methane with commercial catalysts was conducted for thermochemical heat storage. The reaction conditions were investigated for temperature range of 700 to
and steam to carbon mole ratios between 3.0 and 5.0. The reactor was made of stainless steel and it's dimension was 12 cm inside diameter and 6cm long. The effects of space velocity and reactants mole ratio and temperature on the methane conversion and CO selectivity were examined. Optimum reaction condition was determined. There was not a significant difference of methane conversion and CO selectivity compared to conventional reactor.
Implementation of the 50kW Utility Interconnected Photovoltaic System Simulator
Jeong, Byeong-Ho ; Park, Jeong-Min ; Cho, Geum-Bae ; Baek, Hyung-Lae ; Chung, Soo-Bok ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 21~27
This paper summarizes the results of these efforts by offering a photovoltaic system structure in 50kW middle scale applications installed in Cho-sun University dormitory roof. The combination of photovoltaic system components are interconnected and system monitoring system will be summarized for the purpose of the increasing safety in this article. This paper describes configuration of utility interactive photovoltaic system which generated electric power supplies to dormitory. In order to installing the middle or large scale photovoltaic system, It must investigated the optimal design of system, compute quantity of power generation, economic rate of return and so on. In this paper represent 50kW utility photovoltaic system examination and developed simulation results. The performance of photovoltaic system has been evaluated and analyzed with simulation. The results obtained in this research will be much useful to prior investigation for installing utility interactive photovoltaic system.
A Classification of the Wind Turbine Accident
Yang, In-Sun ; Kim, Seok-Woo ; Kyong, Nam-Ho ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 29~35
Wind turbines can produce an unpolluted electricity getting energy only from the natural resource. It is one of the most economic power generating system among renewables up to now. Currently, ther are many wind turbines in operation world-wide under various external conditions. A wind turbine is composed of many machine components. So it is likely that the many accidents have been occurred in many wind turbines. In this paper, we reviewed "Wind turbine Accident data" of Caithness Windfarms Information Forum 2005. We classified this data and analyzed. The most of wind turbines in our country are foreign product. It is like that application it is possible with information which is important for wind farm operations and maintenance and for the wind turbine design and manufacturing.
A study on the solar assisted heating system with refrigerant as working fluid
Kim, Ji-Young ; Ko, Gawng-Soo ; Park, Youn-Cheol ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 37~44
An experimental study was conducted to analyze performance of a heating system with variation of control logic of the system. The system uses a solar as heat source and composed with heat pump that uses R-22 as working fluid. The difference between the developed system and the commercially available heating system is working fluid. The solar assisted heating system which was widely distributed in the market uses water as a working fluid. It could be freezing in case of the temperature drops down under freezing point. The anti-freezing fluids such as methyl-alcohol or ethylene-glycol are mixed with the water to protect the freezing phenomena. However, the system developed in this study uses a refrigerant as a working fluid. It makes the system to run under zero degree temperature conditions. Another difference of the developed system compare with commercial available one is auxiliary heating method. The developed system has removed an auxiliary electric heater that has been used in conventional solar assisted heating system. Instead of the auxiliary electric heater, an air source heat exchanger which generally used as an evaporator of a heat pump was adapted as a backup heating device of the developed system. As results, an efficiency of the developed system is higher than a solar assisted heat pump with auxiliary electric heater. The merit of the developed system is on the performance increment when the system operates at a lower solar energy climate conditions. In case of the developed system operates at a normal condition, COP of the solar collector driven heat pump is higher than the air source heat exchanger driven heat pump's.
A Study of Architectural Space Design Method Considering Daylight Penetration Control - Focusing on the Spaces for Exhibition -
Tae, Won-Jin ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 45~51
Appling natural light to the spaces for the exhibition requires the compromises between the expectations of visitors whom are preferable to perceive the details of the works of art, and preservation of light sensitive artworks of least exposure to light. To solve the compromises, it requires a careful planing to control the penetration of the daylight by physical and mechanical devices such as diffusive glasses and blinds. The control of light penetration can also be achieved by providing spaces inside and outside of the building. The aim of this study is suggest the conceptual methods to control the daylight by space design. Museums and galleries using daylight were investigated how the daylight is controlled by the integrated spaces in the exhibition spaces. This study presents nine ways of controlling daylight penetration by space design.
The optimal window system of office buildings considering energy efficiency
Yoo, Ho-Chun ; Oh, Young-Ho ; Park, Seung-Kil ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 53~60
The purpose of this study is to improve energy efficiency of windows in office buildings through the evaluation of their heating, cooling and illumination load. Energy efficiency is influenced by window size which is determined at the early stage of building design. The process of this study is as follows. First, energy performance is analysed according to the various rates of windows through computer simulation (ECOTECT). Then, the annual heating, cooling and illuminating loads according to the different window sizes are compared one another. Results indicated that the optimal window size considering energy efficiency is 50% of the surface area. When the window size is 50% of the surface area, annual maintenance expense is also smallest. Since the cost of cooling is larger than that of heating, too low indoor air temperature in summer is unfavorable based on the reasonable annual maintenance expenses.
Experimental Study on Airtightness Performance of the House with High Levels of Insulation and Airtight Construction
Shin, U-Cheul ; Yoon, Jong-Ho ; Baek, Nam-Choon ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 61~67
The purpose of this study is to evaluate the air tightness of Zero Energy Solar House(ZeSH) and to propose the construction improvement of junctions and penetrations where air infiltration was identified. Air leakage rate were measured by means of blower door test in accordance with ASTM E779-87. The results showed that ZeSH has an excellent airtightness with ACH50/20 (air change per hour at a pressure difference of 50 Pa between inside outside) of 0.34hr-1 and leakage class E by normalized leakage area of ASHRAE.
A Study on the Performance of Ground Source Heat Pump System
Lee, Se-Kyoun ; Woo, Joung-Son ; Ro, Jeong-Geun ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 69~76
The performance of water-to-water heat pump system coupled with the ground source vertical heat exchanger is presented in this paper. The CAP program of Florida Heat Pump Co. is used to predict the heat pump performances while the EED program calculates the borehole fluid temperature. It is shown that COPH increases with decreasing the temperature of output water for the operation of heating mode and COPR increases with increasing temperature of output water for the operation of cooling mode. The value of specific heat extraction rate must be moderate to insure the reasonable installation cost of borehole system. With
the average COPH increase is estimated as about
range) while with
the estimation of COPR increase is about
range) at the specific heat extraction rate of 30W/m.
A Study on the Application of Fixed-concentrated PV Module Hybrid Panel for BIPV
Seo, Yu-Jin ; Huh, Chang-Su ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 77~83
The verified thermal efficiency, thermal capacity confirmed the effects of the cooling system. Therefore, it is useful for preventing the PV cell temperature rising when solar radiation accumulates in summer. When adopting a hybrid panel for the BIPV system, the affected areas include the vertical outside walls facing the south, southeast, and southwest on the curtain walls excluding windows. The standards on replace aluminum panel which were the popular exterior material were investigated, Designing practice made sure that it could be manufactured in various sizes, and confirmed the most proper method to install a hybrid panel in the BIPV system.
Performance Evaluation of Fixed-concentrated Photovoltaic/Thermal Hybrid Panel using Reflector
Seo, Yu-Jin ; Huh, Chang-Su ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 85~92
One of the most effective methods for utilizing solar energy is to combine thermal solar and optical energy simultaneously using a hybrid panel. Many systems using various kinds of photovoltaic panels have already been constructed. But utilizing solar energy by means of a hybrid panel with concentrator has not been to be attempted yet. Normally if sunlight is directed on the solar cell, and there is no increase in temperature, the absorption energy of each cell will increase per unit area. In a silicon solar cell. however, cell conversion efficiency decreases according to the increasing temperature. Therefore, to maintain cell conversion efficiency under normal condition, it is necessary to keep the cell at operating temperature. we design and make new hybrid panel with cooling system to prevent increasing of temperature on cell, collect effectively thermal energy. We compared performance of new hybrid panel with PV module and thermal panel. We also evaluated conversion efficiency, electric power and thermal capacity and confirmed cooling effect from thermal absorption efficiency.
An Analysis of Illuminance Distribution in Fine Art Museum with Girdle Skylight Type
Choi, Man-Jin ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 93~100
Character and illuminance distribution of daylighting is very important for the architectural plan in museum. Those data show bases for exhibition space design with daylighting and play a decisive role in visual perception of articles and space aesthetic. The goal of this paper was therefore to analyze the illuminance distribution in fine art museum with 3 typical girdle skylight types which are devided according to the art of protection from glare. This Experiment proved that they had a striking contrast with regard to the ratio of daylight illumination and illuminance distribution in spite of the same purpose of those development. The girdle skylight with a translucent glass showed the strongest value of the ratio of daylight illumination, but inequable illuminance distribution in space, excepting the area of the wall. However, the latticed reflector of light refracted daylight in the direction of wall and made illuminance distribution very equable in whole space. The ratio of daylight illumination at the girdle skylight which was located at the verge of the ceiling, was highest at the upper part of the wall and was reduced gradually from there, by way of the middle and under part of the wall, to the center of space.
An experimental study of heat transfer in a submerged water jet
Ohm, Ki-Chan ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 101~110
An experimental study of heat transfer of submerged water jet impinging normally on a flat plate is presented. Heat transfer measurements obtained with Reverse cone type nozzle(Rcone) were compared to those obtained with Cone type nozzle(Cone) and Square edged type nozzle(Vert) of the same diameter(D=8mm) for different jet velocities in the range of
and various nozzle-to target spacings(
). The local Nusselt number profiles exhibited a sharp drop for
and 2nd, 3rd peaks revealed at r/D=2, 3 respectively, followed by a slower decrease there after. The peaks were weakened with increasing the nozzle-to target spacing and decreasing the jet velocity. The stagnation Nusselt number of the Reverse cone type nozzle was larger than those of the other two nozzles for H/D=2. 10, but Cone type nozzle had the highest value for
. Also average Nusselt number of the Reverse cone type nozzle was higher than those of the other two nozzles at
, except for
A Study on the Micro-climate of the City to Construct Wind Ways
Jeon, Ji-Hyeon ; Park, Seok-Bong ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 111~118
The purpose of this study is to address the progress of the heat island phenomenon and the scheme to decrease in heat island phenomenon through analysis of micro-climates according to land use and make a plan to construct wind ways. The result is: 1) Analysis of temperature and humidity at 6 spots for 24 hours showed that heat island phenomenon was considerably intense around center road of Gwangju and can be mild through making lakes and green zones. 2) Analysis of the direction and velocity of the wind at 2 spots for 24 hours showed that the direction of the wind at the center of Gwangju was SSW(South-South-West) and average velocity of the it was
. To make the inflow of the low-temperature air current from Mt. Mudeung into the city through Gwangju river, efficient management of Gwangju riverside parks should be considered for Gwangju river itself to be wind way. 3) Analysis of mobile temperature measurement on 3 courses for 24 hours showed that the low-temperature air current of Mt. Mudeung and a micro-climate of Gwangju river can lighten thermal storage phenomena of the city in that the temperature was lowest at Gwangju riverside. These outcome is from a day term measurement. So, to figure out accurate condition of heat island phenomenon in Gwangju City, it is needed to have long term measurements and accumulation of those information.
A Study on the Optimum Slope of the Roof for Minimum Cooling Load
Tae, Won-Jin ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 119~123
The main purpose of this study is to define an optimum slope of the roof that demands minimum cooling load of the building, when the roof is affected by the solar and wind energy. Two different roof shapes were chosen: hip, gabled. The cooling load of building having those roof shapes was calculated through the computer simulation, using DOE program. For the simulation, the angle of the roof and angle of the orientation was changed. In the conclusion of this paper, an optimum slope of the roof which causes minimize cooling load is presented according to the roof shape and orientation. The result of this study could provide a practical design guideline for determining the roof angle for various climatic conditions.
Evaluation of Indoor Thermal Environment of Houses using for heating in winter
Park, Seok-Bong ; Lee, Hyun-Woo ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 125~131
This study identified satisfaction with gas heating and indoor thermal environment, targeting houses using gases for heating. 1) Thermal environment is relatively satisfactory except that indoor humidity is low. 2) A question that indoor temperature has to be decreased for saving energy was given and about two thirds of the respondents answered that temperature has to be lowered. When they were asked how to save energy 57% answered that they put on more clothes and 27% answered that they lower indoor temperature If consistent promotion on energy saving is implementer it's believed that energy can be effectively saved. 3) People wear simple clothes when they stay indoor because they think it is comfortable. However, for energy saving. they gave to wear warm clothes though they stay indoor.
Experimental Study on Removal Characteristics of Indoor Suspended Particulates by Ventilation.
Kang, Tae-Wook ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 133~139
In this paper, the ventilation performance of suspended particulates in indoor side was investigated by step-down method. Experiments were performed in function of mechanical ventilation types and locations of supply and extract air. The type 2 ventilation system shows the highest removal characteristics rather than other 2 types. It means that the displacement ventilation has also good decay rates of concentration compared to mixing ventilation.
Performance Improvement Justification of a Concentrating Photovoltaic(CPV) System over a non-concentrating PV system
Naveed, Ahmed T ; Kang, Eun-Chul ; Lee, Eui-Joon ;
Journal of the Korean Solar Energy Society, volume 25, issue 4, 2005, Pages 141~153