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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 27, Issue 4 - Dec 2007
Volume 27, Issue 3 - Sep 2007
Volume 27, Issue 2 - Jun 2007
Volume 27, Issue 1 - Mar 2007
Selecting the target year
Operational Characteristics of Wind Turbine Generator Systems in Hangwon Wind Farm
Ko, Kyung-Nam ; Kang, Mun-Jong ; Huh, Jong-Chul ;
Journal of the Korean Solar Energy Society, volume 27, issue 1, 2007, Pages 1~9
This paper reveals both the operational situation and the cause of the error occurred in wind turbine generator system of Hangwon wind farm in Jeju island. The four wind turbines were selected for this work, and the monitored period was for six months. Wind resource in the wind farm was analyzed, and the estimated energy production was compared with the actual energy production. As a result, with a decrease of system error, the estimated energy production was in good agreement with the actual energy production. The errors occurring in components such as gearbox and hydraulic motor affected the Availability of the wind turbine. Also, poor external conditions such as a strong wind, lightning and gust caused a standstill of wind turbines.
A Study on the Analysis of Solar Radiation on Inclined Surfaces for the Installation of PV Systems
Jo, Dok-Ki ; Kang, Young-Heack ;
Journal of the Korean Solar Energy Society, volume 27, issue 1, 2007, Pages 11~17
The amount of incident rays over inclination according to direction has been widely utilized as important data in installing photovoltaic systems. This is because the performance of the photovoltaic systems in much affected by angle and direction of incident rays. Recognizing that factors mentioned above are of importance, actual experiment on the moving route of the sun have been performed in this research to obtain the angle of inclination with which the maximum incident rays can be absorbed. After all, the standard for designing highly optimized photovoltaic systems will be provided for designers and employees working in the photovoltaic module related industries.
The Study on the Reliability Enhancement for Solar Energy Resources Using the Data quality Management System in Korea (Focused on Data Error Analysis)
Jo, Dok-Ki ; Kang, Young-Heack ;
Journal of the Korean Solar Energy Society, volume 27, issue 1, 2007, Pages 19~27
The Data quality management system(DQMS) organizes and helps manage and process time sequence data usually collected in monitoring networks and programs. DQMS places particular emphasis on data qualify while maintaining a highly organized and convenient structure for data. It operates with in a flexible and powerful commercial relational data base environment which can readily link to other software platforms from local spreadsheets to network server. The Korea Institute of Energy Research(KIER) has been solar radiation data since May, 1991 for 16 different locations. KIER's new data is expected to be extensively used by designer and researchers of solar systems in lieu of unreliable old ones. Unfortunately, the quality of the data has not always been properly mentioned. The purpose of this study is to systematically identify errors in such data set using DQMS in an effort to rehabilitate error-ridden old data. DET successfully uncovered solar radiation data that had questionable quality.
Performance Comparison of Dish Solar Collector With Mirror Arrays & Receiver Shapes
Ma, Dae-Sung ; Kim, Yong ; Seo, Tae-Beom ;
Journal of the Korean Solar Energy Society, volume 27, issue 1, 2007, Pages 29~38
In order to analyze the performance comparison of dish solar collector with mirror arrays and receiver shapes, the radiative heat flux distribution inside the cavity receiver is numerically investigated. The solar irradiation reflected by dish solar collector is traced using the Monte-Carlo method. Five different dish solar collectors and three different cavity receivers are considered. A parabolic-shaped perfect mirror of which diameter is 1.5 m is considered as a reference dish solar collector and four different arrays of twelve identical parabolic-shaped mirror facets of which diameter are 0.4 m are used. Their reflecting areas, which are
, are the same. Three different cavity receiver shapes are dome, conical, and cylindrical. In addition, the radiative properties of the concentrating surfaces can vary the thermal performance of the cavity receiver so that variation of the surface reflectivity of each mirror is considered. Based on the calculation, the design information of dish solar collector for producing the electric power can be obtained. The results show that the dome type has the best performance in receiver shapes and the 2AND4 INLINE has the best performance in mirror arrays except perfect mirror.
Analysis of Solar Simulator's Uncertainty Factor for Maximum Output Power Test of Photovoltaic Module
Kang, Gi-Hwan ; Kim, Kyung-Soo ; Park, Chi-Hong ; Yu, Gwon-Jong ; Ahn, Hyung-Keun ; Han, Deuk-Young ;
Journal of the Korean Solar Energy Society, volume 27, issue 1, 2007, Pages 39~45
In this paper, we analyzed the elements of measurement uncertainty on electrical performance test which are the most important things in photovoltaic module performance test. Repeating the performance test by 6 men, the measurement uncertainty could be calculated. In this experiment, Solar Simulator (A-Class pulse type) used for domestic certificate test of PV module is Pasan IIIb (Balval, Switzerland). The possible elements of the measurement uncertain that could effect electrical performance test of PV module are reference cell, spectrum correction, error from measurement repetition, test condition, stability and uniformity of artificial solar simulator. To find the measurement uncertainty, 6 men repeated the test by 10 times. And the results were that numerical average value was 124.44W and measurement uncertainty was
with 95% confidence level for 125W PV module(KD-5125).
A Study of Performance Characteristics on Hybrid Heat Pump System with Solar Energy as Heat Source
Park, Youn-Cheol ; Kim, Ji-Young ; Ko, Gwan-Soo ;
Journal of the Korean Solar Energy Society, volume 27, issue 1, 2007, Pages 47~54
Interests on renewable energy are increased due to oil price and environmental problems aroused from the fossil energy usage. In this study, performances of a solar assisted hybrid heat pump system are analyzed by experimental method. The developed system could runs at two types of operating mode. When the storage temperature is higher than the set temperature, the stored hot water in storage tank is supplied to the load directly. On the other hand, when the storage temperature lower than the set temperature, the water inside of the storage tank is used as heat source of the heat pump. In this study, the system control temperature for the alternation of the operating mode is set to
of the storage tank outlet. As results, it is founded that the COP of the developed heat pump system shows between 3.0 and 3.5. It is resonable performance for the heating system with a renewable energy as secondary heat source. The solar collect used in this study could supplies heat to the storage tank at over 400 W/m2 solar intensity. If the irradiation is lower than the 400 W/m2, the circulation pump stored and it could not supply heat to the storage tank. It is found that the difference temperature between the outlet of the storage tank and collector is
. Even though, the extended study should be conducted to get a optimum performance of the developed system with various operating condition and control strategies.
Basic Design and Dynamic Simulation of Large Scale Solar Thermal Power Plant
Kim, Jong-Kyu ; Kang, Yong-Heack ; Kim, Jin-Soo ; Yoon, Hwan-Ki ; Yu, Chang-Kyun ; Lee, Sang-Nam ;
Journal of the Korean Solar Energy Society, volume 27, issue 1, 2007, Pages 55~61
This paper describes the procedure and calculation results of basic design and transient variation of performance of 1 MWe large scale solar thermal power plant (STPP) by using the commercial software of THERMOFLEX and TRNSYS, respectively. In order to simulate the transient variation of STPP, the results of basic design are necessary. The design standard of the STPP is 1 MWe generation with solar only at high DNI condition and then 0.6 MWe output power for 1 hour using stored energy when the DNI becomes lower unable to operate normally. The results of basic design show the important design data of flow rates, water/steam conditions at each equipments and the estimated efficiency of STPP. In addition, dynamic simulation results of STPP are predicted and plotted for one year and three different days weather data of Daejeon.
Measurement of Classroom Air Quality in large cities in summer
Kim, Yun-Deok ;
Journal of the Korean Solar Energy Society, volume 27, issue 1, 2007, Pages 63~74
Together with the concern about the indoor all quality as sick house syndrome, the Ministry of Environment announced "Indoor Air Quality Control Law for the Multi Purpose Facility," which made the interests to be focused in the urgent understanding of current condition and preparation of measures about the indoor air pollution. In Dec 2005, the law was revised to obligatorily notify the amount of Formaldehyde and Volatile Organic Compounds in the case of newly constructed apartments with more than 100 houses. School also have its own indoor air quality guideline, Indoor air quality in school is very important because, children who very weak to indoor pollutants reside long time in there. The purpose of this paper is to survey indoor air qualify in school by field measurement. Field measurements were performed in 11 schools which were selected from 3 major cities(Incheon, Dae-jeon, chuncheon) in korea, during July, 2004. Totally concentration of Indoor pollutants were determined in 27 classroom. Target air pollutants were TVOC, formaldehyde, dust, CO, CO2 and NO2. For the result of this investigation, Indoor air quality in classroom was very poor and it was found that some pollutants (TVOC, float bacteria) exceed the guideline.
Steam reforming of methane in a solar receiver reactor
Kim, Ki-Man ; Han, Gui-Young ; Seo, Tae-Beom ; Kang, Yong-Heack ;
Journal of the Korean Solar Energy Society, volume 27, issue 1, 2007, Pages 75~81
Steam reforming of methane using Xe-arc solar simulator was studied for the application of concentrated solar energy into chemical reaction. The reactor, a volumetric absorber, consisted of a porous ceramic foam disk coated with commercial reforming catalyst. Operating temperature was in the range of
and the excess steam ratio to methane was from 3.0 to 5.0. At the steady-state condition, the conversion of methane Increased with temperature in the range of 15 % - 30 % and the experimentally determined conversion was found to be close to theoretical equilibrium conversion. It was also found that the CO selectivity slightly decreased with excess steam ratio. Finally, the conversion of methane decreased significantly with space velocity of reactants.
A Study on the Energy Performance Evaluation of Window System with the Balcony Types of Apartments
Yoon, Jong-Ho ; An, Young-Sub ; Kim, Byoung-Soo ; Hwang, Sang-Kun ;
Journal of the Korean Solar Energy Society, volume 27, issue 1, 2007, Pages 83~90
Apartment balcony has been indiscreetly remodeled since the government permitted remodeling on January 2006. But remodeled balcony has a few problems such as increase of heating energy, surface condensation and cold draft. The reason of thermal problem is mainly caused by the window system in a extended balcony. The purpose of this study is to analyze heating and cooling energy and propose the efficient window types for the extended balcony area of a apartment building. 4 types of window system which have fairly high U value in Korea are investigated as follows ; double clear glass, double low-e glass, triple clear glass and triple low-e glass. Comparing double clear 91ass with double low-e glass, triple clear glass and triple low-e glass, simulation results show that 10%, 7% and 15% saving of total primary energy can be expected.
A Fundamental Study of BIPV System Functioned as Solar Collector for Building Application
Min, Sung-Hye ; Suh, Seung-Jik ;
Journal of the Korean Solar Energy Society, volume 27, issue 1, 2007, Pages 91~98
Perimeter zone is one of the weakest area in buildings and it makes an increase of heating and cooling loads, in addition to condensation or discomfort with cold-draft to residents in winter. Because of this, it needs to be reinforced by active systems. However, they use fossil fuel, and ultimately greenhouse effect is urged. Thus, we proposed BIPV system functioned as solar collector which can substitute active system. As an fundamental stage, heat balance equation in steady-state by Fortran was used not only, in winter for pre-heating effect and electric power capacity during the day, but also in summer, for the latter during the day and sky radiation effect during the night. Especially, we should have considered shading on PV by IES Suncast, since even a little bit of it makes the efficiency too low for the PV modules to work. As a result, in summer day, the PV panel should be tiled in 70 degrees to gain the most electric power. Moreover, we could verify that this model makes higher temperature and heat flux under 0.02 m/s. On the other hand, the PV had the high efficiency with high velocity because of cooling effect behind the PV. Therefore, we should regard the air current distribution later on.