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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Solar Energy Society
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Journal DOI :
The Korean Solar Energy Society
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Volume & Issues
Volume 33, Issue 6 - Dec 2013
Volume 33, Issue 5 - Oct 2013
Volume 33, Issue 4 - Aug 2013
Volume 33, Issue 3 - Jun 2013
Volume 33, Issue 2 - Apr 2013
Volume 33, Issue 1 - Feb 2013
Selecting the target year
Variability Characteristics Analysis of the Long-term Wind and Wind Energy Using the MCP Method
Hyun, Seung-Gun ; Jang, Moon-Seok ; Ko, Suk-Hwan ;
Journal of the Korean Solar Energy Society, volume 33, issue 5, 2013, Pages 1~8
DOI : 10.7836/kses.2013.33.5.001
Wind resource data of short-term period has to be corrected a long-term period by using MCP method that Is a statistical method to predict the long-term wind resource at target site data with a reference site data. Because the field measurement for wind assessment is limited to a short period by various constraints. In this study, 2 different MCP methods such as Linear regression and Matrix method were chosen to compare the predictive accuracy between the methods. Finally long-term wind speed, wind power density and capacity factor at the target site for 20 years were estimated for the variability of wind and wind energy. As a result, for 20 years annual average wind speed, Yellow sea off shore wind farm was estimated to have 4.29% for coefficient of variation, CV, and -9.57%~9.53% for range of variation, RV. It was predicted that the annual wind speed at Yellow sea offshore wind farm varied within
Comparison Analysis of Estimation Models of Hourly Horizontal Global Solar Radiation for Busan, Korea
Kim, Kee Han ; Oh, Kie-Whan ;
Journal of the Korean Solar Energy Society, volume 33, issue 5, 2013, Pages 9~17
DOI : 10.7836/kses.2013.33.5.009
Hourly horizontal global solar radiation has been used as one of significant parameters in a weather file for building energy simulations, which determines the quality of building thermal performance. However, as about twenty two weather stations in Korea have actually measured the horizontal global sola radiation, the weather files collected in other stations requires solar data simulation from the other meteorological parameters. Thus, finding the reliable complicated method that can be used in various weather conditions in Korea is critically important. In this paper, three solar simulation models were selected and evaluated through the reliability test with the simulated hourly horizontal global solar radiation against the actually measured solar data to find the most suitable model for the south east area of Korea. Three selected simulation models were CRM, ZHM, and MRM. The first two models are regression type models using site-fitted coefficients which are derived from the correlation between measured solar data and local meteorological parameters from the previous years, and the last model is a mechanistic type model using the meteorological data to calculate conditions of atmospheric constituents that cause absorption and scattering of the extraterrestrial radiation on the way to the surface on the Earth. The evaluation results show that ZHM is the most reliable model in this area, yet a complicated hybrid simulation methods applying the advantages of each simulation method with the monthly-based weather data is needed.
Loss Calculation Method of Grid-Connected Photovoltaic System
So, Jung-Hun ; Lim, Hyun-Mook ; Wang, Hye-Mi ; Jung, Young-Seok ; Ko, Suk-Whan ; Ju, Young-Chul ;
Journal of the Korean Solar Energy Society, volume 33, issue 5, 2013, Pages 18~23
DOI : 10.7836/kses.2013.33.5.018
This paper presents a simple but valid loss calculation method of grid-connected photovoltaic system based on normalized yield model. The proposed method can be represented as a quantitative value for five losses and performance of grid-connected photovoltaic system with three years monitored data. These results will indicate that it is useful to investigate various loss factors causing the performance obstruction, enhance the lifetime yield for changing meteorological conditions, and determine the optimal design and performance improvement of grid-connected photovoltaic system.
Workers' Possible Exposure Hazards in Solar Energy Industries
Jang, Jae-Kil ; Park, Hyunhee ;
Journal of the Korean Solar Energy Society, volume 33, issue 5, 2013, Pages 24~33
DOI : 10.7836/kses.2013.33.5.024
Renewable energy industries, including sola cell plants, has been ever increasing ones for reducing fossil fuel consumption and strengthening national energy policy. In this paper we tried to identify occupational health hazards in solar cell-related industries operated in Korea. Poly silicon, silicon ingot and wafer, solar cell and module are major processes for producing solar cells. Poly silicon operations may cause hazards to workers from metal silicon, silanes, silicon, hydro fluoric acid and nitric acid. Solar cells could not be constructed without using metals such as aluminum and silver, acids such as hydrofluoric acid and nitric acid, bases such as sodium hydroxide and potassium hydroxide, and solvent and phosphorus chloride oxide. Workers in module assembly process may exposed to isopropanol, flux, solders that contain lead, tin and/or copper. To prevent occupational exposure to these hazards, it is essential to identify the hazards in each process and educate workers in industries with proper engineering and administrative control measures.
Performance Analysis of Anti-islanding Function for Grid-connected PV Inverter Systems under Parallel Connections
Jung, Young-Seok ; Yu, Byung-Gyu ; Kang, Gi-Hwa ;
Journal of the Korean Solar Energy Society, volume 33, issue 5, 2013, Pages 34~40
DOI : 10.7836/kses.2013.33.5.034
Islanding phenomenon of photovoltaic system is undesirable because it leads to a safety hazard to utility service personnel and may cause damage to power generation and power supply facilities as a result of unsynchronized re-closure. Anti-islanding protection is an important technical requirement for grid-connected PV system. Until now, various anti-islanding methods for detecting and preventing islanding of photovoltaic and other distributed generations have been proposed. Most of them are focusing on the anti-islanding performance of single PV system according to the related international and domestic standard test procedures. There are few studies on the islanding phenomenon for multiple photovoltaic operation in parallel. This paper presents performance analysis of anti-islanding function for grid-connected PV inverter systems when several PV inverters are connected in parallel.
Reassessment of Economic Feasibility for a Wind Farm on Jeju Island Considering Variable Jeju SMP
Kim, Hyo-Jeong ; Ko, Kyung-Nam ; Huh, Jong-Chul ;
Journal of the Korean Solar Energy Society, volume 33, issue 5, 2013, Pages 41~50
DOI : 10.7836/kses.2013.33.5.041
Economic feasibility study using weighted average variable Jeju System Marginal Price, SMP, was conducted for Gasiri wind farm of Jeju Island. To predict the variable Jeju SMP, generator share ratio for SMP was calculated from the real time wind power production and the power demand data for years. Also, sensitivity analysis on Net Present Value, NPV, and Benefit/Cost Ratio, B/C ratio, were performed to clarify which factors are more important in assessing economic feasibility. The result shows that the Gasiri wind farm has a minimum of 110 billion won and a maximum of 132 billion won difference between fixed and variable SMP. Also, Capacity Factor, C.F., had the highest sensitivity for NPV, followed by SMP. Accordingly, when economic analysis for a potential wind farm site is carried out, the variable SMP as well as C.F. should be considered for more accurate assessment of the wind farm.
Evaluating Reliability of Rooftop Thermal Infrared Image Acquired at Oblique Vantage Point of Super High-rise Building
Ryu, Taek-Hyoung ; Um, Jung-Sup ;
Journal of the Korean Solar Energy Society, volume 33, issue 5, 2013, Pages 51~59
DOI : 10.7836/kses.2013.33.5.051
It is usual to evaluate the performance of the cool roof by measuring in-site rooftop temperature using thermal infra-red camera. The principal advantage of rooftop thermal infrared image acquired in oblique vantage point of super high-rise building as a remote sensor is to provide, in a cost-effective manner, area-wide information required for a scattered rooftop target with different colors, utilizing wide view angle and multi-temporal data coverage. This research idea was formulated by incorporating the concept of traditional remote sensing into rooftop temperature monitoring. Correlations between infrared image of super high-rise building and in-situ data were investigated to compare rooftop surface temperature for a total of four different rooftop locations. The results of the correlations analyses indicate that the rooftop surface temperature by the infrared images of super high-rise building alone could be explained yielding
values of 0.951. The visible permanent record of the oblique thermal infra-red image was quite useful in better understanding the nature and extent of rooftop color that occurs in sampling points. This thermal infrared image acquired in oblique vantage point of super high-rise made it possible to identify area wide patterns of rooftop temperature change subject to many different colors, which cannot be acquired by traditional in-site field sampling. The infrared image of super high-rise building breaks down the usual concept of field sampling established as a conventional cool roof performance evaluation technique.
Lightning Characteristics and Lightning Rate Evaluation of Wind Farm by Lightning of Jeju Island for 2008-2012
Han, Ji-Hoon ; Ko, Kyung-Nam ; Huh, Jong-Chul ;
Journal of the Korean Solar Energy Society, volume 33, issue 5, 2013, Pages 60~68
DOI : 10.7836/kses.2013.33.5.060
This paper presents the characteristics of lightning over established and scheduled wind farms of Jeju island as well as over specific range of entire Jeju Island. The lightning data for 5 years from 2008 to 2012 was obtained from IMPACT ESP which detects lightning. Lightning frequency, lightning strength and regional lightning events were analyzed in detail, and then the lightning maps of Jeju Island were created. The evaluation of lightning rate was made for all the wind farms of this study. Damage to wind turbines by lightning was found in the existing wind farms. As a result, the eastern part of Jeju Island had more lightning frequency than the western part of the Island. Also, the evaluation of lightning rate was good for all established and scheduled wind farms of Jeju Island. Hankyung is the best place for lightning safety, while precaution should be taken against lightning damage in Kimnyung. Lightning damage to wind turbines occurred in Samdal and Haengwon wind farms, which had the first and the second highest lightning rate of the five existing wind farms.
The PV MPPT & Charge and Discharge Algorithm for the Battery Included Solar Cell Applications
Kim, Seung-Min ; Park, Bong-Hee ; Choi, Ju-Yeop ; Choy, Ick ; Lee, Sang-Chul ; Lae, Dong-Ha ;
Journal of the Korean Solar Energy Society, volume 33, issue 5, 2013, Pages 69~75
DOI : 10.7836/kses.2013.33.5.069
To increase the efficiency of the photovoltaic, almost photovoltaic appliances are controlled by Maximum Power Point Tracking(MPPT). Existing most of the PV MPPT techniques have used power which multiplies sensed output current and voltage of the solar cell. However, these algorithms are unnecessarily complicated and too expensive for small and compact system. The other hand, the proposed MPPT technique is only one sensing of the MPPT converter's output current, so there is no need to insert another sensors of battery side. Therefore, this algorithm is simpler compared to the traditional approach and is suitable for low power solar system. Further, the novel proper charge/discharge algorithm for the battery with PV MPPT is developed. In this algorithm, there is CC battery charge mode and load discharge mode of the PV cell & battery dual. Also we design current control to regulate allowable current during the battery charging. The proposed algorithm will be applicable to battery included solar cell applications like solar lantern and solar remote control car. Finally, the proposed method has been verified with computer simulation.
A Study on Analysis of Space Evaluation Using the Luminance Distribution Images
Han, Sang-Pil ; Kim, Jong-Youn ; Cho, Nam-Cheol ; Yi, Yong-Kyu ; Kim, Nam-Jin ;
Journal of the Korean Solar Energy Society, volume 33, issue 5, 2013, Pages 76~81
DOI : 10.7836/kses.2013.33.5.076
In our former study, we proposed that the AC-Model might be applied to various conditions. And we also introduced the method for daylighting that it was possible to reduce discomfort glare and to improve visual impressions as the supplementary type and blind-control type on the compound lighting. The purpose of this study was to examine the relationship between physical elements and psychological evaluation of lighting space. The study was made using an full-size space, which were equipped with various luminaries. We investigated the relationship between subjective evaluation and characteristics of light distribution and showed the high correlation between the evaluation rating and luminance distribution over whole room.
The Experimental Research for the Use Characteristics of the Passive and Active type Domestic Solar Hot Water Systems
Lee, Dong-Won ; Kwak, Hee-You ;
Journal of the Korean Solar Energy Society, volume 33, issue 5, 2013, Pages 82~88
DOI : 10.7836/kses.2013.33.5.082
There are the stirring test and drain test in the daily performance test to determine the thermal performance of a domestic solar hot water system. The drain test is a test that measures the discharge heating rate while drain the hot water from the top of the storage tank and supply the city water to the bottom of the tank. From the perspective of the user, this drain test is more effective than the stirring test. In this study, the thermal performance were compared through the drain test for a passive type and an active type domestic solar hot water systems consisting of the same storage tank and collectors. At this point, a passive type was used the horizontal storage tanks, and an active type was used vertical storage tank. In the drain test, when the hot water drained up to the reference hot water temperature, an active type which have vertical storage tank represents excellent daily performance than a passive type which have horizontal storage tank regardless of weather conditions. The reason for this is because the vertical storage tank is advantageous to thermal stratification in the tank. After the drain test, the residual heat for the horizontal storage tank was much more than the vertical storage tank, but in the next day the amount of discharged heat were less than the those of vertical storage tank neither. Thus, the solar water heating system which have horizontal storage tank should be adopted preheating control method rather than separate using control method when connected with auxiliary heat source device.
Design Factor Calculation and Analysis of Grid-Connected Photovoltaic System
So, Jung-Hun ; Hwang, Hye-Mi ; Jung, Young-Seok ; Ko, Suk-Whan ; Ju, Young-Chul ; Lim, Hyun-Mook ;
Journal of the Korean Solar Energy Society, volume 33, issue 5, 2013, Pages 89~94
DOI : 10.7836/kses.2013.33.5.089
This paper presents a simple but valid design factor calculation method of grid-connected photovoltaic system using normalized yield model. The proposed calculation method can be represented as a quantitative value about five design factors from irradiance to system output power. The validity of this method is identified by analyzing design factor with three years monitored data. These results will indicate that it is useful to determine the optimal design and selection of grid-connected photovoltaic system to meet different user purposes and enhance long-term reliability and stability of grid-connected photovoltaic system.
A Study on the Optimization of New Renewable Energy Systems in Public-Purpose Facilities
Lee, Yong-Ho ; Seo, Sang-Hyun ; Cho, Young-Hum ; Hwang, Jung-Ha ;
Journal of the Korean Solar Energy Society, volume 33, issue 5, 2013, Pages 95~104
DOI : 10.7836/kses.2013.33.5.095
This study set out to devise an optimized system to take into account life cycle cost(LCC) and ton of carbon dioxide(
) by applying the weighted coefficient method(WCM) to "public-purpose" facility buildings according to the mandatory 5% and 11% of new renewable energy in total construction costs and anticipated energy consumption, respectively, based on the changes of the public obligation system. (1) System installation capacity is applied within the same new renewable energy facility investment according to the mandatory 5% of new renewable energy in total construction costs. Both LCC and
recorded in the descending order of geothermal, solar, and photovoltaic energy. The geothermal energy systems tended to exhibit an excellent performance with the increasing installation capacity percentage. (2) Optimal systems include the geothermal energy(100%) system in the category of single systems, the solar energy(12%)+geothermal energy(88%) system in the category of 2-combined systems, and the photovoltaic energy(12%)+solar energy(12%)+geothermal energy(76%) system and the photovoltaic energy(12%)+solar energy(25%)+geothermal energy(63%) system in the category of 3-combined systems. (3) LCC was the highest in the descending order of photovoltaic, geothermal and solar energy due to the influences of each energy source's correction coefficient according to the mandatory 11% of new renewable energy in anticipated energy consumption. The greater installation capacity percentage photovoltaic energy had, the more excellent tendency was observed.
recorded in the descending order of geothermal, photovoltaic and solar energy with the decreasing installation capacity of photovoltaic energy. The greater installation capacity percentage a geothermal energy system had, the more excellent tendency it demonstrated. (4) Optimal systems include the geothermal energy(100%) system in the category of single systems, the photovoltaic energy(62%)+geothermal energy(38%) system in the category of 2-combined systems, and the photovoltaic energy(50%)+solar energy(12%)+geothermal energy(38%) system and the photovoltaic energy(12%)+solar energy(12%)+geothermal energy(76%) system in the category of 3-combined systems.
A Basic Study on the Effect of the Wind Pressure according to Form on the Flat Roof mounted PV System
Yun, Doo-Young ; Lee, Eung-Jik ;
Journal of the Korean Solar Energy Society, volume 33, issue 5, 2013, Pages 105~112
DOI : 10.7836/kses.2013.33.5.105
The new renewable energy became popular as a clean and sustainable alternative energy under the circumstances that the entire world is facing severe abnormal climate due to the use of fossil fuel, and among which, solar energy can be obtained anywhere and is not difficult to apply it into the existing buildings, which makes it possible to be widely distributed. However, as PV module is installed into a single plate system, it shows structural weaknesses which are vulnerable to wind load and give loss to design elements in external appearance. Accordingly, this study planned one-step parallel system to complement the problems occurring from a single plate system and used STAR-CCM+ V.8 made by CD-Adapco, a computational fluid dynamics(CFD) simulation tool to measure wind load stability and support based on the design standards for a single plate system and one-step parallel system. Building height was limited to less than 10m and wind speed was given when increasing from 35m/s to 50m/s by 5m/s on PV system installed into the flat roof. In this case, our analysis suggested that step-one parallel system was in class 7-9 according to Beaufort's wind power classification, which did not have an impact on the fixed PV system, and the single plate system is considered to cause risks in designing wind speed in central districts because it is more than wind power class 12.