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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 31, Issue 6 - Dec 2011
Volume 31, Issue 5 - Oct 2011
Volume 31, Issue 4 - Aug 2011
Volume 31, Issue 3 - Jun 2011
Volume 31, Issue 2 - Apr 2011
Volume 31, Issue 1 - Feb 2011
Selecting the target year
Modeling of Water Transportation in Dynamic Load Proton Exchange Membrane (PEM) Fuel Cell Power Generator
Agung, Bakhtiar ; Choi, Kwang-Hwan ; Kim, Young-Bok ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 1~7
DOI : 10.7836/kses.2011.31.2.001
Experimental Study on Influence of Flow Rate Ratio in a Dehumidifier with a Solar Desiccant Apparatus
Choi, Kwang-Hwan ; Rokhman, Fatkhur ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 8~15
DOI : 10.7836/kses.2011.31.2.008
Analysis of various MPPT algorithms for PCS
Shim, Jae-Hwe ; Yang, Seung-Dae ; Jung, Seung-Hwan ; Choi, Ju-Yeop ; Choy, Ick ; An, Jin-Ung ; Lee, Dong-Ha ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 16~21
DOI : 10.7836/kses.2011.31.2.016
Since the maximum power operating point(MPOP) of PCS alters with changing atmospheric conditions temperature conditions shadow conditions it is important to operate for PCS to keep maximum power point tracking(MPPT) continuously. This paper presents the results of modeling PV system by PSIM simulator and investigates the influence on the PV system from aspect of power quality i.e. voltage drop. This paper investigates four MPPT algorithms; Perturbation & Observation(P&O) Improved P&O Incremental Conductance(Incond) Differential coefficient method simulated with irradiation temperature change and shadow conditions.
Loss analysis to the various kinds of core for PCS inductor and transformer
Yang, Seung-Dae ; Shim, Jae-Hwe ; Choi, Ju-Yeop ; Song, Seung-Ho ; Choy, Ick ; An, Jin-Ung ; Lee, Dong-Ha ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 22~30
DOI : 10.7836/kses.2011.31.2.022
In recently, inductor and transformer is the common device using widely in the photovoltaic system and power electronics. Therefore, each inductor and transformer has different core loss and iron loss depending on the size and kinds of core materials, it is important to analyze loss characteristics for better transformer efficiency. This paper offers an efficiency calculation method for PCS inductor and transformer loss, and different kinds of core materials are analyzed for optimized PCS design.
Energy Efficient LED Lighting Design to utilize the Sun Light
Jeong, Hak-Geun ; Han, Soo-Bin ; Jang, Cheol-Yong ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 31~36
DOI : 10.7836/kses.2011.31.2.031
LED is expected as an environmentally friendly next generation light source with its good reliability and long lifetime. The light sources for illumination have a variety of applications in the indoor and outdoor, and the variation of optical power and color rendering of the light source limits their applications. Therefore, it is necessary to research the LED lamp and its luminaire to minimize the variation of dynamic characteristics and to improve the color rendering due to that illuminating environment. Daylight is very good light source to human and can be used as primary or a secondary light source with benefits of energy, productivity and health.This paper presents the design method of LED lighting system to improve poor property in terms of CR(color redering) characteristic to use daylight effectively.
The Development of Photovoltaic Resources Map Concerning Topographical Effect on Gangwon Region
Jee, Joon-Bum ; Zo, Il-Sung ; Lee, Kyu-Tae ; Lee, Won-Hak ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 37~46
DOI : 10.7836/kses.2011.31.2.037
The GWNU (Gangnung-Wonju national university) solar radiation model was developed with radiative transfer theory by Iqbal and it is applied the NREL (National Research Energy Laboratory). Input data were collected and accomplished from the model prediction data from RDAPS (Regional Data Assimilated Prediction Model), satellite data and ground observations. And GWNU solar model calculates not only horizontal surface but also complicated terrain surface. Also, We collected the statistical data related on photovoltaic power generation of the Korean Peninsula and analyzed about photovoltaic power efficiency of the Gangwon region. Finally, the solar energy resource and photovoltaic generation possibility map established up with 4 km, 1 km and 180 m resolution on Gangwon region based on actual equipment from Shinan solar plant,statistical data for photovoltaic and complicated topographical effect.
Thermal Performance Assessment of Insulated door by experiment.
Jang, Cheol-Yong ; Kim, Chi-Hoon ; Ahn, Byung-Lip ; Hong, Won-Hwa ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 47~52
DOI : 10.7836/kses.2011.31.2.047
Currently, Exterior wall's U-value about building envelope is 0.36 W/
(Central Region), but window's one is 2.1 W/
according to air gap of glazing, filling gas, coating and type of windows. The door"s one is 1.6~5.5 W/
depending on material and configuration of door. As such, energy loss per unit of door is considerably larger like windows. The door for the recognition was relatively low because energy loss through the door is relatively small compared to window area. In this paper, thermal performance was analyzed through simulation targeting the door which has thermal break that can improve the insulation performance and doesn't have one. As a results of simulations, case1 was calculated as the average of 1.63 w/m2k and case 2 was calculated as the average of 4.14 w/m2k. The thermal performance of door depends on the type and condition of insulations. As a results of final simulations, Case1 was calculated as 1.06 w/m2k and Case2 was calculated as 1.27 w/m2k. As a results of the experiments, thermal performance of case 1 was measured as 1.28 w/m2k. Error between experiments and simulations is considered problems encountered when creating the samples. The effect of door frame on the overall thermal performance is slight because it's a small proportion of the door frame.
Design of Structure of Heliostat Reflective Surface for 200kW Tower Type Solar Thermal Power Plant
Park, Young-Chil ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 53~62
DOI : 10.7836/kses.2011.31.2.053
Heliostat in the tower type solar thermal power plant is a sun tracking mirror system to reflect the solar energy to the receiver and the optical performance of it affects to the efficiency of whole power plant most significantly. Thus a proper design of structure of the heliostat reflective surface could be the most important step in the construction of such power plant. The work presented here is a design of structure of optical surface of heliostat, which will be used in 200kW solar thermal power plant. The receiver located at 43(m) high from ground in tower has
(m) rectangular shape. We first developed the software tool to simulate the energy concentration characteristics of heliostat using the ray tracing technique. Then, the shape of heliostat reflective surface is designed with the consideration of heliostat's energy concentration characteristics, production cost and productivity. The designed heliostat's reflective surface has a structure formed by canting four of
(m) rectangular flat plate mirror facet and the center of each mirror facet is located on the spherical surface, where the spherical surface is formulated by the mirror facet mounting frame.
Comparative Validation of WindCube LIDAR and Remtech SODAR for Wind Resource Assessment - Remote Sensing Campaign at Pohang Accelerator Laboratory
Kim, Hyun-Goo ; Chyng, Chin-Wha ; An, Hae-Joon ; Ji, Yeong-Mi ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 63~71
DOI : 10.7836/kses.2011.31.2.063
The remote-sensng campaign was performed at the Pohang Accelerator Laboratory where is located in a basin 6km inland from Yeongil Bay. The campaign aimed uncertainty assessment of Remtech PA0 SODAR through a mutual comparison with WindCube LIDAR, the remote-sensing equipment for wind resource assessment. The joint observation was carried out by changing the setup for measurement heights three times over two months. The LIDAR measurement was assumed as the reference and the uncertainty of SODAR measurement was quantitatively assessed. Compared with LIDAR, the data availability of SODAR was about half. The wind speed measurement was fitted to a slope of 0.94 and
of 0.79 to the LIDAR measurement. However, the relative standard deviation was about 17% under 150m above ground level. Therefore, the Remtech PA0 SODAR is judged to be unsuitable for the evaluation of wind resource assessment and wind turbine performance test, which require accuracy of measurement.
Prediction of Annual Energy Production of Gangwon Wind Farm using AWS Wind Data
Woo, Jae-kyoon ; Kim, Hyeon-Gi ; Kim, Byeong-Min ; Paek, In-Su ; Yoo, Neung-Soo ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 72~81
DOI : 10.7836/kses.2011.31.2.072
The wind data obtained from an AWS(Automated Weather Station) was used to predict the AEP(annual energy production) of Gangwon wind farm having a total capacity of 98 MWin Korea. A wind energy prediction program based on the Reynolds averaged Navier-Stokes equation was used. Predictions were made for three consecutive years starting from 2007 and the results were compared with the actual AEPs presented in the CDM (Clean Development Mechanism) monitoring report of the wind farm. The results from the prediction program were close to the actual AEPs and the errors were within 7.8%.
The Development of the Lens of the Optical System for High Concentration Solar PV System
Ryu, Kwang-Sun ; Cha, Won-Ho ; Shin, Goo-Hwan ; Cho, Hee-Keun ; Kim, Young-Sik ; Kang, Seong-Won ; Kang, Gi-Hwan ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 82~88
DOI : 10.7836/kses.2011.31.2.082
The artificial increase in the solar intensity incident on solar cells using lenses or mirrors can allow solar cells to generate equivalent power with a lower cost. There are two types of concentration optics for solar energy conversion. One is to use mirrors, and the other is to use Fresnel lenses. The gains that can be achieved with a Fresnel lens or a parabolic mirror are compared. The result showed the gains are comparable and the two configurations were developed competitively. In application areas of Fresnel lenses as solar concentrators, several variations of design were devised and tested. Some PV systems still use commercially available flat Fresnel lenses as concentrators. A convex linear Fresnel lens to improve the concentration ratio and the efficiency is devised and flat linear Fresnel lens in thermal energy collection is utilized. In this study, we designed and optimized flat Fresnel lens and the 'light pipe' to develop 500X concentrated solar PV system. In the process, we compare the transmission efficiencies according to groove types. We performed rigorous ray tracing simulation of the flat Fresnel lenses. The computer aided simulation showed the 'grooves in case' has the better efficiency than that of 'grooves out case'. Based on the ray-trace results we designed and manufactured sample Fresnel lenses. The optical performance were measured and compared with ray-trace results. Finally, the optical efficiency was measured to be above 75%. All the design and manufacturing were performed based on that InGaP/InGaAs/Ge triple junction solar cell is used to convert the photon energy to electrical power. Field test will be made and analyzed in the near future.
Energy Performance Variation of Solar Water Heating System by LCC Optimization in an Office Building
Ko, Myeong-Jin ; Choi, Doo-Sung ; Chang, Jae-Dong ; Kim, Yong-Shik ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 89~98
DOI : 10.7836/kses.2011.31.2.089
This study examined the energy performance according to the main design parameters of a solar water heating system for an office building using the life cycle cost (LCC) optimization simulations. The LCC optimization simulations of the system were conducted with TRNSYS and GenOpt employing the Hooke-Jeeves algorithm for cases where water temperature was
. The results showed that for water temperature at
the global radiation incident on the collector could be decreased by 16.98% and 28.52%, collector useful energy gain could be decreased by 15.04% and 22.59%, energy to load from storage tank could be decreased by 10.86% and 18.06% and AH energy to load could be increased by 16.86% and 38.50% respectively compared to a non-optimized system. The annual average collection efficiency of the collector was increased by 0.88% for
and 2.78% for
because of increase of collector slope and decrease of the mass flow rate per collector area. The annual average efficiency of the system was increased by 1.74% and 3.47% compared to the basis system. However, the annual solar fraction of the system was decreased by 6.68% for
and 11.26% for
due to decrease of collector area and storage tank volume.
Estimation of Solar Radiation Distribution in Korea Using a Satellite
Jo, Dok-Ki ; Yun, Chang-Yeol ; Kim, Kwang-Deuk ; Kang, Young-Heack ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 99~106
DOI : 10.7836/kses.2011.31.2.099
Since the solar energy resource is the main input for sizing any solar photovoltaic system, it is essential to utilize the solar radiation data as an application and development of solar energy system increase. It will be necessary to understand and evaluate the insolation data. The Korea Institute of Energy Research(KIER) has begun collecting horizontal global insolation data since May, 1982 at 16 different locations in Korea and for the more detailed analysis, images taken by geostationary satellite may be used to estimate solar irradiance fluxes at earth"s surface. It is based on the empirical correlation between a satellite derived cloud index and the irradiance at the ground. From the results, the measured data has been collected at 16 different stations and estimated using satellite at 23 different stations over the South Korea from 1982 to 2009. The Result of analysis shows that the annual-average daily global radiation on the horizontal surface is 3.56 kWh/
/day and estimated solar radiation fluxes show reliable results for estimating the global radiation with average deviation of -7.27 to +3.65% from the measured values.
A Study for the Effect on the Uncertainty of Power Performance Testing of Windturbine by a Site Calibration
Kim, Keon-Hoon ; Hyun, Seung-Gun ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 107~112
DOI : 10.7836/kses.2011.31.2.107
A comparison study between two performance testing results, one is on the site calibration not needed and the other is needed, was proceeded for the understanding on the effect of site calibration on the complex terrain. As a result, it is revealed that all of uncertainty components is effected by the topographical features dramatically. And the maximum difference of uncertainty reached at around 8% of rated capacity of wind turbine. So, the site calibration is an effective method to remove the variable wind effect by the ground complexity and must be proceeded before the power performance testing of a wind turbine.
Evaluation on the lighting performance of a dynamic LED lighting system
Kim, Hyo-In ; Kim, Jeong-Tai ; Yun, Geun-Young ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 113~119
DOI : 10.7836/kses.2011.31.2.113
LED lighting has received much attention in recent years due to its high energy efficiency and environmental friendliness. As the color of light can be obtained by adjusting the light intensity of LEDs, the quality of visual environment can be improved. The aims of this study are to develop a wavelength adjustable LED lighting system and to examine its lighting performances. The LED lighting system and experimental cell for assessment of the lighting performance were constructed. This LED lighting system is able to materialize the various spectral power distribution and color temperature of light through the control of the four dimmers. Up to
kinds of light combinations are possible. The range of illuminance on workplane were measured as 7~1,831 ㏓. Improvement of psychological and physical functions for occupants can be expected according to control of lighting performances.
Efficiency analysis of the boost converter using power balance condition
Lee, Kook-Sun ; Choy, Ick ; Choi, Ju-Yeop ; Song, Seung-Ho ; An, Jin-Ung ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 120~127
DOI : 10.7836/kses.2011.31.2.120
Solar array has the following nonlinear characteristic, such as whose output current increases, output voltage is reduced. For this reason, boost converter with solar array system is always controlled to remain on the maximum power point of the solar array. In this case, we are not focused on the output of the solar array and not consider efficiency of the boost converter, which is assumed reliable. But efficiency of the converter also should be considered, which affects the total efficiency of the overall solar energy system. In this paper, efficiency calculation of the boost converter using power balance method is proposed, which will be used for a powerful reference before hardware realization.
An Analysis of Performance Assessment Factors of Indoor Environmental Quality in Multi-Family Housing Using Post Occupancy Evaluation
Lee, Si-Nae ; Park, Jin-Chul ; Rhee, Eon-Ku ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 128~134
DOI : 10.7836/kses.2011.31.2.128
The objective of this study is to analyze the major factors of indoor environment that affect the satisfaction of the occupancy in multi-family residential buildings. The results of this study can contribute to improving the comfort of the residents effectively as they are applied preferentially at the design and construction stages. The indoor environment factors investigated for the analysis included thermal, light, air and the acoustic environment. The individual factors were derived from the 'indoor environment' assessment indices of the green building certificate systems of various countries. Based on these, a questionnaire was prepared to conduct the Post Occupancy Evaluation. The survey results were statistically analyzed.
A Study on the Optimum Application Method of Solar Thermal System to reduce Thermal Load and Carbon Emission in Apartment Building
Yoon, Jong-Ho ; Sim, Se-Ra ; Shin, U-Cheul ; Baek, Nam-Chun ; Kwak, Hee-Yul ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 135~142
DOI : 10.7836/kses.2011.31.2.135
Architectural market in the world is trying to develop Zero Carbon Buildng that doesn"t use fossil fuel. Residential building that thermal load such as heating and domestic hot water is over 70% in energy consumption is easy to make Zero Carbon Building compared with office building that is mainly electric load. So, As a preliminary for analyzing the effect of Solar thermal system in the building, an annual energy consumption of residential building and total heat loads are calculated. Based on this result, three alternatives of solar thermal system for hot water and heating are applied in the building while installation area is increasing. Solar thermal system is applied on balcony and roof of apartment building as the way to reduce thermal load. In the first case that solar thermal system for hot water is applied on the balcony, optimum installation area is
. And you could install
of this system in the roof that angle is
. In the second case of solar thermal system for heating and hot water, you can install
on the roof. As a result of economic evaluation, the most economical application method is to install
of solar thermal system for only hot water on the roof of the building. At that time, you can payback the initial investing cost within 10 years. And carbon emission of this method can be reduced until about 4 ton per year.
Thermal Performance Analysis for Optimal Operation of Solar Hot Water System
Shin, U-Cheul ; Yoon, Jong-Ho ; Baek, Nam-Choon ; Kwak, Hee-Yeul ;
Journal of the Korean Solar Energy Society, volume 31, issue 2, 2011, Pages 143~147
DOI : 10.7836/kses.2011.31.2.143
On-off differential controller is one of the very important component which has influence on the system performance of the solar hot water system. In this study, it was analysed the influence of "on-off" setting temperature on the system efficiency and the electrical consumption by circulation pump. This study was performed by computer simulation using TRNSYS program. The simulation system was developed in this study was verified the its reliability by the experimental results.