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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 35, Issue 6 - Dec 2015
Volume 35, Issue 5 - Oct 2015
Volume 35, Issue 4 - Aug 2015
Volume 35, Issue 3 - Jun 2015
Volume 35, Issue 2 - Apr 2015
Volume 35, Issue 1 - Feb 2015
Selecting the target year
Prediction of Energy Production of China Donghai Bridge Wind Farm Using MERRA Reanalysis Data
Gao, Yue ; Kim, Byoung-su ; Lee, Joong-Hyeok ; Paek, Insu ; Yoo, Neung-Soo ;
Journal of the Korean Solar Energy Society, volume 35, issue 3, 2015, Pages 1~8
DOI : 10.7836/kses.2015.35.3.001
The MERRA reanalysis data provided online by NASA was applied to predict the monthly energy productions of Donghai Bridge Offshore wind farms in China. WindPRO and WindSim that are commercial software for wind farm design and energy prediction were used. For topography and roughness map, the contour line data from SRTM combined with roughness information were made and used. Predictions were made for 11 months from July, 2010 to May, 2011, and the results were compared with the actual electricity energy production presented in the CDM(Clean Development Mechanism)monitoring report of the wind farm. The results from the prediction programs were close to the actual electricity energy productions and the errors were within 4%.
The Steady-State Characteristic Analysis of 2MW PMSG based Direct-Drive Offshore Wind Turbine
Shin, Pyungho ; Choi, Jungchul ; Yoo, Chul ; Kim, Daejin ; Kyong, Namho ; Ko, Heesang ;
Journal of the Korean Solar Energy Society, volume 35, issue 3, 2015, Pages 9~16
DOI : 10.7836/kses.2015.35.3.009
In order to support various studies for assessment of onshore and offshore wind turbine system including foundations, the land-based version of 2MW PMSG direct drive wind turbine has been analyzed using HAWC2 that account for the coupled dynamics of the wind inflow, elasticity, and controls of the turbine. this work presents the steady-state response of the system and natural frequency of the first thirteen structure turbine modes as a function of wind speed. Rotor, generator speeds, pitch angle, power production, thrust force, deflections of tower and blade are compared for one case below and one case above the rated wind speed.
Wake Losses and Repositioning of Wind Turbines at Wind Farm
Park, Kun-Sung ; Ryu, Ki-Wahn ; Kim, Hyun-Goo ;
Journal of the Korean Solar Energy Society, volume 35, issue 3, 2015, Pages 17~25
DOI : 10.7836/kses.2015.35.3.017
The main objective of this study is to predict the wind power generation at the wind farm using various wake models. Modeling of wind farm is a prerequisite for prediction of annual energy production at the wind farm. In this study, we modeled 20 MW class Seongsan wind farm which has 10 wind turbines located at the eastern part of Jeju Island. WindSim based on the computational fluid dynamics was adopted for the estimation of power generation. The power curve and thrust coefficient with meteorology file were prepared for wind farm modelling. The meteorology file was produced based on the measured data of the Korea Wind Atlas provided by Korea Institute of Energy Research. Three types of wake models such as Jensen, Larsen, and Ishihara et al. wake models were applied to investigate the wake effects. From the result, Jensen and Ishihara wake models show nearly the same value of power generation whereas the Larsen wake model shows the largest value. New positions of wind turbines are proposed to reduce the wake loss, and to increase the annual energy production of the wind farm.
A Study on the Supply obligations allotment rate of New Renewable Energy in Indoor Gymnasiums with the Application of a Daylighting System
Park, Yun-Ha ; Lee, Yong-Ho ; Cho, Young-Hum ; Hwang, Jung-Ha ;
Journal of the Korean Solar Energy Society, volume 35, issue 3, 2015, Pages 27~39
DOI : 10.7836/kses.2015.35.3.027
Under the goal of analyzing the compulsory supply share of new renewable energy according to the application of a daylighting system to indoor gymnasiums, this study conducted analysis of energy consumption and operation schedule at three indoor gymnasiums in the nation through a survey. The investigator did an Energy Plus simulation on Building A based on the analysis results and analyzed the supply share of new renewable energy in the saving effects of lighting energy according to the application of a daylighting system. As a result, When 92 prism daylighting system were installed in the upper ceiling of a stadium, they were able to meet the criteria for the minimum illumination for official games(Min : 600㏓) and optimum illumination for general games and recreations, thus saving lighting energy during the daytime(09:00~17:00). The resulting saving effects of lighting energy amounted to 44.4% for official games, 57.6% for general games, and 66.7% for recreations. In addition, the daylighting systems had a compulsory supply share of new renewable energy at 2.04% for official games, 2.75% for general games, and 2.62% for recreations, recording an average compulsory supply share of 2.5%.
A Case Study on the Design Variables Evaluation of Green Roof System effecting on Building Energy Conservation
Choi, Jeong-Min ;
Journal of the Korean Solar Energy Society, volume 35, issue 3, 2015, Pages 41~48
DOI : 10.7836/kses.2015.35.3.041
This study is to find out the major design variables of Green roof system effecting on the building energy consumption. Therefore, in three categories of green roof system, namely, foliage layer, soil layer and irrigation, 10 design variables are selected and simulated with one-story case building. Simulation is carried out with Design Builder and EnergyPlus. Finally, it was found out the effects of major variables affecting on the building heating and cooling energy and how they are affecting on the heating and cooling seasons respectively.
The Comparison of Operating Characteristics of SVC and STATCOM for Compensating the Reactive Power in the Jeju Power System
LEE, SEUNGMIN ; Kim, Eel-Hwan ; Kim, Ho Min ; Oh, Sung-Bo ; LEE, DOHEON ;
Journal of the Korean Solar Energy Society, volume 35, issue 3, 2015, Pages 49~56
DOI : 10.7836/kses.2015.35.3.049
This paper presents a comparative operating characteristics of static var compensator(SVC) and static synchronous compensator(STATCOM) for compensating the reactive power in the Jeju power system. There are two kinds of reactive power compensating systems, which are active and passive system in the applications of the line commutated converter type high voltage direct current (LCC-HVDC). In the Jeju power system, two STATCOMs as active compensating system have been operating. Even though STATCOM has good performance compared with SVC, economical efficiency of former system is not good to the latter system. So, it is necessary to examine the performance and economical efficiency depend on the intention before appling the system. To compare the operating characteristics of two systems in the Jeju power system, simulations have been carried out for case studies that both of the HVDC system have transient state by using PSCAD/EMTDC program.
An Operation Strategy of Udo Island Power System with the Introducing ESS
LEE, DOHEON ; Kim, Eel-Hwan ; Kim, Ho Min ; Oh, Sung-Bo ; LEE, SEUNGMIN ;
Journal of the Korean Solar Energy Society, volume 35, issue 3, 2015, Pages 57~63
DOI : 10.7836/kses.2015.35.3.057
This paper presents a solution by introducing energy storage system(ESS) to solve an annual blackout due to a typhoon or electrical failure in Udo Island. This island is now receiving electrical power through undersea cables from the Jeju Island. During blackout period, ESS will supply the electricity. And it is necessary to estimate the ESS capacity and control the transient state for the operation of stable power system. For the verification of proposed method, ESS capacities have been estimated according to base load and the minimum capacity of only home appliance in Udo Island. Also, in case of restoring from the fault, the algorithm for synchronization is proposed. Finally, the simulation results by using the PSCAD/EMTDC program will show the feasibility.
Optical Characterization of a High-Flux Solar Thermal Simulator
Chai, Kwan-Kyo ; Lee, Hyun-Jin ; Yoon, Hwan-Ki ; Kim, Jong-Kyu ; Kang, Yong-Heack ; Lee, Sung-Wook ;
Journal of the Korean Solar Energy Society, volume 35, issue 3, 2015, Pages 65~71
DOI : 10.7836/kses.2015.35.3.065
A solar thermal simulator is suitable for indoor experiments of solar receivers and reactors when solar insolation and weather conditions are not favorable. Moreover, due to the easy control of electric power input, the solar thermal simulator allows the adjustment of power input incident on solar receivers and reactors and thus the implementation of accurate experiments. We manufactured a solar simulator, which is comprised of three sets of a xenon lamp and an elliptical reflector. In order to serve as a test facility, optical characterization of the solar simulator via radiation heat flux measurement is a critical prerequisite. We applied the flux mapping method to measuring the heat flux distribution of the three lamps. We presented the measurement results in terms of the heat flux distribution, the peak heat flux, the power distribution, the maximum power, and the efficiency for electric power conversion into radiation power. Characterization results show that our solar simulator provides the peak heat flux of
, the maximum power of 16.9 kW, and the conversion efficiency of 45%, additionally with a 10% operation margin for output increase.
A Study on Thermal Storage Performance and Characteristics of Daily Operation of a Hybrid Solar Air-Water Heater
Choi, Hwi-Ung ; Rokhman, Fatkhur ; Yoon, Jung-In ; Son, Chang-Hyo ; Choi, Kwang-Hwan ;
Journal of the Korean Solar Energy Society, volume 35, issue 3, 2015, Pages 73~79
DOI : 10.7836/kses.2015.35.3.073
In this study, a thermal storage performance and characteristics of daily operation were investigated when the air and the liquid were heated simultaneously by a hybrid solar air-water heater that can make hot water as well as heated air. The hybrid solar air-water heater is kind of a flat plate solar collector that can make hot water and heated air by installing air channel beneath absorber plate of traditional flat plate solar collector for hot water. As a result of daily operation, maximum water temperature reached in a thermal storage was shown
on 73kg/h of air mass flow rate and about
on 176kg/h of air mass flow rate. Thus, the necessity of heating water in thermal storage by operating only liquid side was confirmed when the temperature of liquid in thermal storage is lower than we need. In case of efficiency investigated on daily operation, the thermal efficiency of the liquid side was decreased with increment of the inlet liquid temperature and decrement of the solar radiation, but efficiency of the air side was increased with increment of inlet liquid temperature difference as the traditional solar air heater. Total thermal efficiency of the collector was shown from 65.85% to 78.23% and it was decreased with increment of the inlet liquid temperature and decrement of solar radiation same as the traditional system.
Predicted Cooling Performance of Single Finned Heat Dissipating Block for Economic Assessment of LED Module Markings in Standards
Huh, Young-Joon ; Song, Myung-Ho ;
Journal of the Korean Solar Energy Society, volume 35, issue 3, 2015, Pages 81~91
DOI : 10.7836/kses.2015.35.3.081
LED has received intensive research attention due to its long life, high efficacy, fast response and wide colour availability, and has secured extensive application areas. However, LED chips within the modules convert only fraction of electric energy into light, and majority of supplied energy needs to be dissipated as heat, which challenges in the performance and life of the LED modules. IEC 62717 specifies the performance requirements for LED modules together with the test methods and conditions. The present study examined the influence of different design parameters on performance temperature through series of experiments and numerical simulations. The economic means to change the module performance temperature during the measurement of mandatory markings were suggested based on predicted cooling performances.