Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Solar Energy Society
Journal Basic Information
Journal DOI :
The Korean Solar Energy Society
Editor in Chief :
Volume & Issues
Volume 30, Issue 6 - Dec 2010
Volume 30, Issue 5 - Oct 2010
Volume 30, Issue 4 - Aug 2010
Volume 30, Issue 3 - Jun 2010
Volume 30, Issue 2 - Apr 2010
Volume 30, Issue 1 - Feb 2010
Selecting the target year
Energy Performance Evaluation of a Double-skin Facade with a Venetian Blind in Residential Buildings
Lee, So-Yeun ; Kang, Jae-Sik ; Kim, Kang-Soo ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 1~9
Apartment balcony has been remodeled since the government permitted remodeling in January 2006.But extended balcony has great impact on building heat gain and loss. Therefore It has problems such as increase of heating and cooling energy. So
solutions about window solar gain in summer is an urgent matter. The Purpose of this study is to evaluate energy performance of a blind in a double-skin facade in residential buildings by using EnergyPlus program. The results show that slat angles of
is best in energy performance if we do not consider daylight. Poorly daylighted living room needs electric light and it also causes high cooling load. On the other hand, the results show that the application of blinds controlled automatically is best for energy performance when we consider daylight. Blind slat angles of
have best performance when blinds are controlled in this angle throughout the day on a clear day in August. Blind slat angles of
have best performance when blinds
in this angle throughout the day on a cloudy day (more than 7 of total sky cover) in August.
Power Performance Testing and Uncertainty Analysis for a 3MW Wind Turbine
Kim, Keon-Hoon ; Hyun, Seung-Gun ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 10~15
The installed capacity of wind turbines in KOREA are growing and enlarging by the central government's support program. Thus, the importance of power performance verification and its uncertainty analysis are recognizing rapidly. This paper described the power testing results of a 3MW wind turbine and analysed an uncertainty level of measurements. The measured power curves are very closely coincide with the calculated one and the annual power production under the given Rayleigh wind speed distribution are estimated with the 3.6~12.7% of uncertainty but, in the dominant wind speed region as 7~8m/s, the uncertainty are stably decreased to 6.3~5.3%.
Analysis and comparison of initial performance degradation for single crystalline silicon solar cell under open and short circuit
Jung, Tae-Hee ; Kim, Tae-Bum ; Shin, Jun-Oh ; Yoon, Na-Ri ; Woo, Sung-Cheol ; Kang, Gi-Hwan ; Ahn, Hyung-Keun ; Han, Deuk-Young ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 16~21
It is well-known that Boron-doped Cz Si solar cells suffer light-induced degradation due to boron-oxygen defect which is responsible of a reduction in lifetime and hence efficiency. In this paper, we assume that PV solar cell has been connected with variable load to account the real operating condition and it shows different light-induced degradation of Si solar cell. To evaluate the effect of light-induced degradation for solar cell with various load, Single crystalline solar cells are connected with open and short circuits during light exposure. Isc-Voc curve evaluate light induced degradation of solar cells and the reason is explained as a change for serial resistance. From the results, Electrical characteristics of solar cells show better performance under short circuit conditions, after light exposure.
The Design of Digital Controller for Boost Converter on Photovoltaic System
Im, Ji-Hoon ; Choi, Ju-Yeop ; Song, Seung-Ho ; Choy, Ick ; Jeong, Seung-Hwan ; An, Jin-Ung ; Lee, Dong-Ha ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 22~27
In photovoltaic system, the specifications of solar array is changed as open circuit voltage and short circuit current because of cell temperature and solar radiation. A boost converter of this system connects between output of photovoltaic system and DC link capacitor of grid connected inverter as controlling duty ratio. Therefore to supply stable voltage to the grid, a boost converter is need to keep certain voltage output. Considering the capacitance and the resistance of boost converter, this paper designed proper digital controller.
The Comparative Study on Performance of PTC and Flat-plate Solar Collector
Kim, In-Hwan ; Hur, Nam-Soo ; Kim, Man-Seok ; Lee, Jung-Eun ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 28~33
Solar collectors to be applied are mainly flat-plate or vacuum tube collector which is used for hot water supply of house because of low heat value and low temperature. There are a necessity to expand applicable scope of solar collector into the industrial process heat source and air conditioner for coping with renewable energy policy of government and industrial trend. This study is to analysis the performance of PTC solar collector of concentrating type and flat-plate of non-concentrating. For this, temperature difference and heating value as insolation of air outside is measured from these two collectors mounted on 2-axial solar tracking system. It is investigated that temperature profile obtained from PTC solar collector is uniform and collecting heat per unit area is 6.8kcal/
min which is about 3 times with compare to flat-plate collector of 2kcal/
min. Also the amount of heat to be produced from PTC solar collector is 3 Mcal/
which is about 2 times with compare to flat-plate collector of 1.5Mcal/
as a result of operating these two collectors during one month. Therefore, it is obtained that heat collecting performance of PTC solar collector is superior to flat-plate.
A study on the calculation of greenhouse gas from the industry sector using bottom-up methodology
An, Jae-Ho ; Ahn, Sang-Jueon ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 34~43
Recently environmental regulations like the Kyoto Protocol, adopted in 1997, required the reduction of the greenhouse gas of 5.2% up to 1990 regulations. and 13th General Assembly in 2007, held in Bali of India, have agreed to duty reduction even in developing countries in 2013. Because of the lack of information about real process in small or middle size industries, most recent research omitted to calculate green house gas emissions from the industrial process. Bottom-up methodology will be applied for calculation of green house gasemission from industry sector to solve these problems in this research. Total amount from industry sector of Shicheung-City in 2007 was about 1,797,305 tons of greenhouse gas
and 3,049,403 tons of the greenhouse gas
calculated from industry sector of Ansan-City in 2007.
The Energy Performance Analysis of Large Scale Store Using Dynamic Thermal Analysis Simulation Program
Kim, Byoung-Soo ; Hong, Won-Pyo ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 44~49
The purpose of this study is to analyze the situation of energy consumption and its characteristics in large scale store. The related survey is carried out in large scale store to investigate the energy consumption and energy use trend of heating, cooling, hot water, lighting, ventilation, equipments and others. The area of large scale discount store is about
, located in Daejeon. For Annual Energy Analysis of building, We surveyed used energy for 1 year and simulated using a building energy simulation(TRNSYS 16). The results of this study are as follows. 1)The amount of annual total energy consumption are 18615.244MWh/yr(286.4KWh/
), The rate of heating, cooling and base energy(for hot water, lighting, ventilation, equipments, cooking and others) is 3054MWh/yr(47kWh/
) respectively. The total used energy is higher than others building in Korea. Especially, The energy consumption of large scale store is very depends on operating period and pattern such as space temperature, occupancy, lighting system, equipments operating schedule and etc.
Experimental Study on the Operating Characteristics of a Solar Hybrid Heat Pump System according to Indoor Setting Temperature
Kim, Won-Seok ; Cho, Hong-Hyun ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 50~58
Experimental study on the operating characteristics of a solar hybrid heat pump system according to indoor setting temperature were carried out during spring and winter season. The system was consisted of a concentric evacuated tube solar collector, heat medium tank, heat storage tank, and heat pump. As a result, the heating load was increased by 21.1% when the indoor setting temperature rose by 2oC for the same ambient temperature. Besides, the spring season had good outdoor conditions compared to the winter season, therefore the heating load was reduced and heat gain by collector increased, relatively. In case of the winter season, the solar fraction was shown less than 10% because the heat losses of system and space increased considerably. The solar fraction decreased significantly as the indoor setting temperature increased.
Analysis on Turbulence Intensity Characteristics at Gimnyeong, Jejudo by Applying IEC 61400 Wind Turbine Standards
Kim, Hyun-Goo ; Jeong, Tae-Yoon ; Jang, Moon-Seok ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 59~65
Analysis on turbulence intensity profile depending on wind speed is an important process to set up design condition of wind turbine in terms of fatigue load. This paper tests goodness of fit of turbulence intensity empirical equations suggested by the IEC 61400 Standards with Jejudo Gimnyeong met-tower measurement, which is erected at a seashore. Therefore sea breeze and land breeze coexist. Sea breeze case showed apparent increasing trend of turbulence intensity in a high wind speed regime due to increase of sea surface roughness. However, neither inland wind turbine standard IEC 61400-1 nor offshore wind turbine standard IEC 61400-3 fit such a trend adequately. On the other hand, the modified empirical equation of turbulence intensity of IEC 61400-3 derived from Germany FINO1 application study by considering turbulence intensity behavior in a high wind speed regime showed good agreement with the measurement. Therefore, we can reconfirm and conclude that IEC 61400-3 Ed.1 legislated in 2009 needs to be modified.
A Study on the Wind Data Analysis and Wind Speed Forecasting in Jeju Area
Park, Yun-Ho ; Kim, Kyung-Bo ; Her, Soo-Young ; Lee, Young-Mi ; Huh, Jong-Chul ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 66~72
In this study, we analyzed the characteristics of wind speed and wind direction at different locations in Jeju area using past 10 years observed data and used them in our wind power forecasting model. Generally the strongest hourly wind speeds were observed during daytime(13KST~15KST) whilst the strongest monthly wind speeds were measured during January and February. The analysis with regards to the available wind speeds for power generation gave percentages of 83%, 67%, 65% and 59% of wind speeds over 4m/s for the locations Gosan, Sungsan, Jeju site and Seogwipo site, respectively. Consequently the most favorable periods for power generation in Jeju area are in the winter season and generally during daytime. The predicted wind speed from the forecast model was in average lower(0.7m/s) than the observed wind speed and the correlation coefficient was decreasing with longer prediction times(0.84 for 1h, 0.77 for 12h, 0.72 for 24h and 0.67 for 48h). For the 12hour prediction horizon prediction errors were about 22~23%, increased gradually up to 25~29% for 48 hours predictions.
A Study on Development of Power Analysing Device for PV Module
Moon, Chae-Joo ; Kwak, Seung-Hun ; Jang, Yeong-Hak ; Kim, Tae-Gon ; Kim, Eui-Sun ; Kim, Tae-Hyun ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 73~80
This study was conducted to estimate the relative performance of modules with changed characteristics due to long term exposure to the outdoor environment, with a specially made test device for simultaneous measurement of real time power output from the photovoltaic array, taking into account the inclined panel, direct irradiation, power being generated, temperature as well as the optimal analysis timing. In terminology description, M is an abbreviation of module and Group A, Group B are 10 modules series connection (1~10 of M), (11~20 of M) for each of them respectively. The overall mean voltage difference of M-18 with the lowest power output and M-14 with the highest output is-2.13V and it was identifiable that voltage difference was more concentrated to Group B. In addition, in case of M-2 and M-7, M-8, when compared with M-14, the overall mean voltage difference was -0.92V, -1.56 and -0.91V respectively showing the more concentration to Group A. When the temperature of module went up by
, the mean voltage was reduced by 0.35V. For current, Group A was lower than Group B by-0.022A and the ratio of each group was 49.68% and 50.32% respectively, presumably the module with deteriorated properties were more concentrated to Group A relatively. From the comparison of relations with the comprehensive accumulation, M-2, M-7, M-8, M-16 and M-18 were those with deterioration of performance to the worst, thereby requiring precision examination. In comparative efficiency, M-14 was the most excellent one as 12.19% while M-18 as 10.53% was identified that its efficiency was comparatively rapidly reduced.
Feasibility Analysis of a Wood Bioenergy System in an Apartment Complex
Ko, Myeong-Jin ; Choi, Mi-Young ; Choi, Doo-Sung ; Chang, Jae-Dong ; Kim, Yong-Shik ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 81~88
This study compared the feasibility of utilizing a wood bioenergy system over a conventional central heating and cooling system and a cogeneration system in an apartment complex. The performance of the three systems were compared in the following areas: energy consumption, environmental impact(output of CO2, CH4, and N2O), and life cycle cost. The results showed that energy performance of the wood bioenergy system was similar to the conventional central system (just a 1% improvement) but the cogeneration system showed a 12% reduction in energy consumption compared to the conventional system. In terms of environmental impact, the bioenergy system reduced pollutants by 50% while the cogeneration system reduced pollutants by 30% compared to the conventional system. Life cycle cost analysis indicated bioenergy and cogeneration to have an 8% and 19% improvement over the conventional system. The findings of the study suggest that it is both economically and environmentally beneficial to use a wood bioenergy system in place of a conventional central heating and cooling system in apartment complexes.
A Study on the Perfomance Analysis of Low Energy Cooling Systems in Office building
Park, Chang-Bong ; Rhee, Eon-Gu ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 89~94
A large portion of the energy cost of a building is cooling and heating to maintain a comfortable indoor environment. Air conditioning is now one of the important parts in the building design, as increase in energy consumption and pollutant emission in energy conversion process. In this study, elements that affects the energy consumption of model building are identified and the perfomance analysis of the alternative a Low Energy Cooling Systems considering characteristics of model building and energy saving performance is analyzed. In this study, elements that affect the energy consumption of office building are identified and energy saving performance of the alternative air conditioning system is analyzed. As a result, applied to earn and suggest basic data for energy saving measures. In this study, EnergyPlus simulation program was used to evaluate the energy load when alternative Low Energy Cooling Systems are applied to the model building. The reliability of simulation program is verified by comparing actual energy load from operation data of building management office and predicted energy load using simulation program. For Low Energy Cooling System application which considers the purpose and characteristics of the building, reasonable and energy-saving air conditioning method obtained by analyzing energy consumption elements for each expected air conditioning methods is used to deduct result of this study.
Performance Estimation Method of Grid-Connected Photovoltaic System
So, Jung-Hun ; Lee, Bong-Seob ; Yoo, Jin-Su ; Hwang, Hye-Mi ; Yu, Gwon-Jong ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 95~101
This paper presents performance estimation approach of grid-connected photovoltaic(PV) system to predict energy yield from irradiance to PV system using normalized yield model for changing meteorological conditions. The accuracy and validity of proposed performance estimation method is identified by compared measured with estimated yield using monitored data. These results will indicate that it is useful to estimate various loss factors causing the system performance obstruction and enhance the lifetime yield of PV system.
Analysis of Power Variation and Design Optimization of a-Si PV Modules Considering Shading Effect
Shin, Jun-Oh ; Jung, Tae-Hee ; Kim, Tae-Bum ; Kang, Ki-Hwan ; Ahn, Hyung-Keun ; Han, Deuk-Young ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 102~107
a-Si solar cell has relatively dominant drift current when compared with crystalline solar cell due to the high internal electric field. Such drift current make an impact on the PV module in the local shading. In this paper, the a-Si PV module output characteristics of shading effects was approached in terms of process condition, because of the different deposition layer of thin film lead to rising the resistance. We suggested design condition to ensure the long-term durability of the module with regard to the degradation factors such as hot spot by analyzing the module specification. The result shows a remarkable difference on module uniformity for each shading position. In addition, the unbalanced power loss due to power mismatch of each module could intensify the degradation.
The study of the solar radiation emitted per hour in Incheon applied in load calculation programs
Yoo, Ho-Chun ; Lee, Seon-Dong ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 108~117
Although many researches of simulation programs to predict climate under the current climate change have been performed but more detailed studies of weather date which might influence the load of buildings seem insufficient. In this study, in Incheon are analyzed IES (Integrated Environmental Solutions)6.0, Ecotect 2010, EnergyPlus v4.0's IWEC file and ISO-TRY, the Korean standard weather data provided by the Korean Solar Energy Society for direct normal radiation which is used in load calculation programs. The results show that the radiation of the programs is the same as that of direct normal radiation per month but has a mere difference, compared with the radiation per hour and IWEC has also 77.12% when compared with ISO-TRY, meaning that it could affect load values of buildings when applied to them. And in case of ISO-TRY, it could be judged that the application of test reference year applied by the data measured has higher reliability than IWEC file.
Development of 10 kW Dish-Stirling System for Commercialization and Analysis of Operating Characteristics
Kim, Jong-Kyu ; Lee, Sang-Nam ; Kang, Yong-Heack ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 118~124
In order to develop commercial model of 10kW dish-Stirling solar thermal power system, modification for the exiting facility was taken for a year as a Leading Project in KIER. During the project, solar tracking system, control and monitoring system and high durability reflector were developed and long term operation were performed. The solar tracking system was tested for four months to investigate the degree of precision and adapted to the control system for an actual operation from October in 2009. The sun tracking accuracy of
mrad using modified control system was obtained and the system operated successfully during the experimental period. The monitoring system displays engine pressure, electric generation amounts, generator RPM, receiver temperatures, and etc. from Stirling engine and weather data of Direct Normal Irradiation, Horizontal Global Insolation, wind speed & direction, and atmosphere temperature from weather station. According to the operating results in a clear sky day, electric power of 6,890 W was generated at the DNI value of 850 W/
and the averaged solar-to-electricity efficiency during a whole day reached to 18.99%. From the overall operating results, linear power generation trend could be observed with increasing DNI value. The solar-to-electricity efficiency achieved to 19% around the DNI value of 700 W/
and increased to 20% when the DNI value goes up to 900 W/
Evaluation of Electric and Thermal Characteristics of Photovoltaic Module under Various Temperature and Irradiance Conditions
Kim, Kyung-Soo ; So, Jung-Hun ; Kang, Gi-Hwan ; Yu, Gwon-Jong ; Yoon, Soon-Gil ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 125~130
Normally, PV system is designed using local weather condition like lowest and highest temperature and irradiance. But this might give misleading results because it is not realistic data of PV module itself. To give more specific description of PV system, we tested photovoltaic(PV) modules' temperature, irradiance and maximum power generation characteristics from January to December in 2008 for 3kW PV system. From this, we could deeply analyze the accumulation temperature, electrical characteristics of PV module in various condition. So precise approach to PV system design can be done. The detail description is specified as the following paper.
A Study on Electric Capacity and CO
by the Roof Top PV System of the Industrial Building in Korea
Kim, Ji-Su ; Lee, Eung-Jik ; Hwang, Jung-Ha ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 131~136
The purpose of this study is to provide foundational data for expansion of solar generation in building application, a clean energy, by introducing applicability of solar power generation system on roofs of industrial buildings and computing expected amounts of power and carbon dioxides reduction. As methodologies of this study, after reviewing 120,000 domestic factories to verify the BIPV feasibility for industrial building sthrough theoretical considerations of solar generation system, we calculated BIPV application methods and subsequent expected power generation quantity and carbon dioxide reductions through roof type analysis. we analyzed four cases of expected power generation amounts of solar batteries according to application methods, and when considering that the main type of roofs are slant roofs according to the investigation result about roof forms of domestic industrial complexes, we believe that the module angle of a slant roof around
(case3) is most suitable for the application. Finally, we came up with 517,944[TOE] as the corresponding petroleum tonnage based on this computed expected power generation amount and the amount of 1,214,836[
] carbon dioxide reductions by calculating them by energy sources.
Analysis of the ejector for low-pressure evaporative desalination system using solar energy
Hwang, In-Seon ; Joo, Hong-Jin ; Kwak, Hee-Youl ;
Journal of the Korean Solar Energy Society, volume 30, issue 6, 2010, Pages 137~143
In this study, the ejector design was modeled using Fluent 6.3 of FVM(Finite Volume Method) CFD(Computational Fluid Dynamics) techniques to resolve the flow dynamics in the ejector. A vacuum system with the ejector has been widely used because of its simple construction and easy maintenance. Ejector is the main part of the desalination system, of which designs determine the efficiency of system. The effects of the ejector was investigated geometry and the operating conditions in the hydraulic characteristics. The ejector consists mainly of a nozzle, suction chamber, mixing tube(throat), diffuser and draft tube. Liquid is supplied to the ejector nozzle, the fast liquid jet produced by the nozzle entrains and the non condensable gas was sucked into the mixing tube. In the present study, the multiphase CFD modeling was carried out to determine the hydrodynamic characteristics of seawater-air ejector. Two-dimensional geometry was considered with the quadrilateral-mashing scheme. The gas suction rate increases with increasing Motive flow circulating rate.