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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 32, Issue 6 - Dec 2012
Volume 32, Issue 5 - Oct 2012
Volume 32, Issue 4 - Aug 2012
Volume 32, Issue spc3 - Jun 2012
Volume 32, Issue 3 - Jun 2012
Volume 32, Issue 2 - Apr 2012
Volume 32, Issue 1 - Feb 2012
Selecting the target year
The Performance and Efficiency Analysis of a PVT System Compared with a PV module and a Solar collector
Euh, Seung-Hee ; Lee, Jeong-Bin ; Choi, Yun-Sung ; Kim, Dae-Hyun ;
Journal of the Korean Solar Energy Society, volume 32, issue 2, 2012, Pages 1~10
DOI : 10.7836/kses.2012.32.2.001
A photovoltaic/thermal (PVT)solar system is the solar technology that allows for simultaneous conversion of solar energy into both electricity and heat. This paper compared the performance of PVT system with a conventional PV module and solar collector and analyzed electrical and thermal efficiency of PVT system in terms of solar irradiance and inlet temperature of the working fluid. Based on the experimental data, thermal and electrical efficiencies of he glazed PVT system were57.9% and14.27% under zero reduced temperature condition which were lower by 13.6% than the solar thermal absorber plate and by 0.08% than the PV module respectively. For the unglazed PVT system it had lower thermal efficiency than the solar thermal absorber plate but higher electrical performance than the PV module due to the cooling effect by the working fluid. However, total efficiency of the glazed PVT system was72.2% which was higher than combined efficiencies of the solar collector and PV module. Besides, total efficiency of the PVT system would be much higher if calculated based on unit area.
Optimization of Stand-Alone Hybrid Power Systems Using HOMER Program
Yang, Su-Hyung ; Boo, Chang-Jin ; Kim, Ho-Chan ;
Journal of the Korean Solar Energy Society, volume 32, issue 2, 2012, Pages 11~18
DOI : 10.7836/kses.2012.32.2.011
Diesel fuel is expensive because transportation to remote areas adds extra cost, and it causes air pollution by engine exhaust. Providing a feasible economical and environmental solution to diesel generators is important. A hybrid system of renewable plants and diesel generators can benefit islands or other isolated communities and increase fuel savings. Renewable energy is, however, a natural source that produces a fluctuating power output. In this paper, hybrid power system of the marado lighthouse is proposed to supply stable power in the stand-alone hybrid power system. The proposed hybrid power system consists of the diesel generator, wind turbine, photovoltaic, fuel cell, and battery bank. To decrease the carbon emissions and find the optimization, the cost analysis of hybrid system is simulated using HOMER program and the optimized hybrid power system is designed.
An Experimental Study on Daily Efficiency of Solar Collector with Heating Loads of Solar Water Heating System
Lee, Kyoung-Ho ; Joo, Hong-Jin ; Yoon, Eung-Sang ; Kwak, Hee-Youl ;
Journal of the Korean Solar Energy Society, volume 32, issue 2, 2012, Pages 19~27
DOI : 10.7836/kses.2012.32.2.019
This paper describes an experimental study on efficiency of solar collector in solar water heating system connected to hourly water heating load. In general, the functional form of solar efficiency is expressed as a function of fluid temperature entering solar collector, ambient temperature, and solar irradiance. When energy saving from solar heating of water heating system is analyzed on along-term basis such as one year with given solar irradiance data, simplified analysis is more convenient han detailed system simulation for quick assessment. However, the functional form of the efficiency is not convenient for approximately simplified energy analysis because the inlet temperature can be obtained through a detailed system simulation. In the study, solar collector efficiency is obtained with various daily water heating load sand daily solar irradiance using experimental tests. The study also considers large residential buildings such as apartment buildings for application of solar water heating systems. From test results, it is found that daily solar collector efficiency is proportional to daily water heating loads and daily solar irradiance. The data obtained from the study can be utilized to find a functional relation between daily solar irradiance and daily heating load in stead of collector inlet temperature for application of solar collector efficiency to long-term approximated energy analysis of solar heating system.
A Study on the Estimating Solar Radiation in Korea Using Cloud Cover and Hours of Bright Sunshine
Jo, Dok-Ki ; Yun, Chang-Yeol ; Kim, Kwang-Deuk ; Kang, Young-Heack ;
Journal of the Korean Solar Energy Society, volume 32, issue 2, 2012, Pages 28~34
DOI : 10.7836/kses.2012.32.2.028
It is necessary to estimate the regression coefficients in order to predict the daily global radiation on a horizontal surface. Therefore many different equations have proposed to evaluate them for certain areas. In this work a new correlation has been made to predict the solar radiation for 16 different areas over Korea by estimating the regression coefficients taking into account cloud hours of bright sunshine. Particularly, the multiple linear regression model proposed shows reliable results for estimating the global radiation on a horizontal surface with monthly average deviation of-0.26 to +0.53% and each station annual average deviation of -1.61 to +1.7% from measured values.
A Study on the Solar Radiation Analysis for Components and Classified Wavelength in Korea
Jo, Dok-Ki ; Yun, Chang-Yeol ; Kim, Kwang-Deuk ; Kang, Young-Heack ;
Journal of the Korean Solar Energy Society, volume 32, issue 2, 2012, Pages 35~41
DOI : 10.7836/kses.2012.32.2.035
Knowledge of the solar radiation components and classified wavelength data are essential for modeling many solar photovoltaic systems. This is particularly the case for applications that concentrate the incident energy to attain high photo-dynamic efficiency achievable only at the higher intensities. In order to estimate the performance of concentrating PV systems, it is necessary to know the intensity of the beam radiation, as only this components can be concentrated, and The new PV cell can generate electricity from ultraviolet and infrared light as well as visible light. The Korea Institute of Energy Research(KIER) has began collecting solar radiation components data since January, 1988, and solar radiation classified wavelength data since November, 2008. KIER's solar radiation components and classified wavelength data will be extensively used by concentrating PV system users or designers as well as by research institutes. It is essential to utilize the solar radiation data as application and development of solar energy system increase. Consider able efforts have been made constructing a standard data base system from measure data.
Performance Analysis of Combined Passive Solar System for Building South Wall
Yun, Tae-Gyun ; Lee, Hyun-Soo ; Jang, Hyang-In ; Suh, Seung-Jik ;
Journal of the Korean Solar Energy Society, volume 32, issue 2, 2012, Pages 42~49
DOI : 10.7836/kses.2012.32.2.042
In this article, the author carried out a theoretical study on the application techniques of a new Combined Passive Solar System (hereinafter referred to as the CPSS) of direct gain and trombe walls to get quick morning heating and to prevent afternoon overheating for office building. The numerical model proposed in this study can be used for the performance analysis of the CPSS in the winter and summer. Heating and Cooling loads are analysed for building energy consumption reduction using this numerical model. The results indicate that CPSS in the winter and summer modes could provide profitable conditions for improvement of indoor thermal comfort control and energy saving. consequently, the application of CPSS will not lead to significant reductions in the auxiliary air conditioning demand but also realize the environmentally friendly building.
The analysis of the renewable energy supply ratio for the school building applied PV system
Kang, Su-Hyun ; Lee, Yong-Ho ; Hwang, Jung-Ha ; Cho, Young-Hum ;
Journal of the Korean Solar Energy Society, volume 32, issue 2, 2012, Pages 50~57
DOI : 10.7836/kses.2012.32.2.050
Recently the renewable energy has been used widely and the importance of renewable sources is bigger than before. And the government enforced a law to the public buildings to install the renewable energy facilities. The capacity of facilities was 5% of total construction cost until April 13, 2011. Since then, the government changed the law from 5% of total construction cost to 10% of predicted energy usage for the resonable use of the renewable energy facilities. In this study, the comparative analysis is conducted according to the law to the building installed PV system through the Energy Plus simulation. And the method for improving renewable energy supply ratio was analyzed using existing PV array. Adjusting the PV array angle is the best way to generate more electric power without additional fee. When applying the month optimum angle, 3,600kWh of electric power are more generated compared to the existing angle.
A Study on Evaluation of the Building Energy Rating depending on the Thermal Performance of Balcony Window with Low-E glazing
Lee, Na-Eun ; Ahn, Byung-Lip ; Jang, Cheol-Yong ; Leigh, Seung-Bok ;
Journal of the Korean Solar Energy Society, volume 32, issue 2, 2012, Pages 58~63
DOI : 10.7836/kses.2012.32.2.058
As the exterior of building has been considered one of th important parts, the use of glass that is suitable to express various appearances gets raised. However, windows have 6~7times lower insulating performance than insulated walls. Lately, highly efficient windows are required as the needs for reduction of energy consumption come to the force. Therefore, Nowadays more people use cooling systems in summer, more the use of Low-E glazing is increasing. Because it is good to block Solar Radiant Energy which can cause much of heat loss while cooling system is working. This study measures U-value of the double Low-E glazing window and commonly used single Low-E glazing window. And then the effect of each window on the efficiency rating has been analyzed applying to the certification system of the building energy efficiency rating which has implemented.
The Study on the Optimal Angle of the Solar Panel using by Solar Radiation Model
Jee, Joon-Bum ; Choi, Young-Jean ; Lee, Kyu-Tae ;
Journal of the Korean Solar Energy Society, volume 32, issue 2, 2012, Pages 64~73
DOI : 10.7836/kses.2012.32.2.064
The angle of solar panels is calculated using solar radiation model for the efficient solar power generation. In ideal state, the time of maximum solar radiation is represented from 12:08 to 12:40 during a year at Gangneung and it save rage time is12:23. The maximum solar radiation is 1012
inc lear sky and cloudy sky, respectively. Solar radiation is more sensitive to North-South (N-S) slope angle than East-West (E-W) azimuth angle. Daily solar radiation on optimum angle of solar panel is higher than that on horizontal surface except for 90 days during summer. In order to apply to the real atmosphere, the TMY (typical meteorological Year) data which obtained from the 22 solar sites operated by KMA(Korea Meteorological Administration) during 11 years(2000 to 2010) is used as the input data of solar radiation model. The distribution of calculated solar radiation is similar to the observation, except in Andong, where it is overestimated, and in Mokpo and Heuksando, where it is underestimated. Statistical analysis is performed on calculated and observed monthly solar radiation on horizontal surface, and the calculation is overestimated from the observation. Correlationis 0.95 and RMSE (Root Mean Square Error) is10.81 MJ. The result shows that optimum N-S slope angles of solar panel are about
lower than station latitude, but E-W slope angles are lower than
. There are three types of solar panels: horizontal, fixed with optimum slope angle, and panels with tracker system. The energy efficiencies are on average 20% higher on fixed solar panel and 60% higher on tracker solar panel than compared to the horizontal solar panel, respectively.
Optimum Blind Control to Prevent Glare Considering Potential Time Error
Seong, Yoon-Bok ;
Journal of the Korean Solar Energy Society, volume 32, issue 2, 2012, Pages 74~86
DOI : 10.7836/kses.2012.32.2.074
For the improvement of environmental comfort in the buildings with the blind control, the objective of this study is to prevent the direct glare caused by the daylight inlet. During the process of solar profile prediction, time are significant factors that may cause error and glare during the blind control. This research proposes and evaluates the correction and control method to minimize prediction error. For the local areas with different longitude and local standard meridian, error occurred in the process of the time conversion from local standard time to apparent solar time. In order to correct error in time conversion, apparent solar time should be recalculated after adjusting the day of year and the equation of time. To solve the problems by the potential time errors, control method is suggested to divide the control sections using the calibrated fitting-curve and this method is verified through simulations. The proposed correction and control method, which considered potential time errors by loop lop leap years, could solve the problems about direct glare caused by daylight inlet on the work-plane according to the prediction errors of solar profile. And also these methods could maximize daylight inlet and solar heat gain, because the blocked area on windows could be minimized.
Prediction of Wind Shear Exponent in Complex Terrain
Kim, Hyeon-Gi ; Kim, Byeong-Min ; Kim, Jin-Han ; Paek, In-Su ; Yoo, Neung-Soo ;
Journal of the Korean Solar Energy Society, volume 32, issue 2, 2012, Pages 87~94
DOI : 10.7836/kses.2012.32.2.087
In this study, we found a relationship between wind shear exponent,
, and a few factors such as the wind speed,
, ruggedness index(
), and the Weibull shape parameter,
of sites in complex terrain in Korea. Wind shear exponents in main wind directions were calculated using wind speed data measured for one year from various heights of eleven meteorological masts in Gangwon province. It was found from the analysis that the reciprocal of the wind shear exponent can be expressed by an exponentially decaying function with respect to a multiple of
. This result is considered useful to be used to characterize wind characteristics of specific sites in complex terrain in Korea with limited information.
Evaluating the Output of Small-size Wind Power Generators Using Weibull Data
You, Ki-Pyo ; Kim, Young-Moon ;
Journal of the Korean Solar Energy Society, volume 32, issue 2, 2012, Pages 95~104
DOI : 10.7836/kses.2012.32.2.095
This study purposed to predict wind energy for small size wind power generators at 50m above the ground in each area using mean wind speed data for 10 minutes collected from 2001 to 2011 by meteorological data in large cities having over 60% of 15 story (50m) or higher apartments including Seoul, Daejeon, Gwangju and Daegu representing the inland region, and Busan, Incheon and Ulsan representing the coastal region. In the results of analysis, we confirmed close agree ment between observatory weather data and probability density distribution obtained using Weibull's parameters, and this suggests that Weibull's parameter is applicable to the estimation of wind energy. Hourly output energy using the mean wind speed for 10 minutes and output energy obtained from Weibull's parameter showed an error less than 5%, and thus it was found that wind energy can be evaluated using Weibull's modulus.
A Comparative Study on the Characteristics of Thermoacoustic Laser for Applying Solar Energy
Park, Sung-Seek ; An, Eoung-Jin ; Oh, Seung-Jin ; Chun, Won-Gee ; Kim, Nam-Jin ;
Journal of the Korean Solar Energy Society, volume 32, issue 2, 2012, Pages 105~112
DOI : 10.7836/kses.2012.32.2.105
The conversion of solar energy into acoustic waves is experimentally studied. Measurements were made on the Sound Pressure Level (SPL), frequency, onset time and the temperature gradient across the stack. A pyrex resonance tube is used with a honey-comb structure ceramic stack along with Ni-Cr and Cu wires. An AL1 acoustical analyzer was used to measure the SPL and frequency of acoustic waves whereas K-type thermocouples were hired to estimate temperature gradients. For a resonance tube of 100 mm, no acoustic waves were generated with a power input of 25W. By increasing its length to 200 mm, however, maximum SPLs of 96.4 dB, 106.3 dB and 112.8 dB were detected for the tubes of 10mm,20mm and 30mm in IDs and their respective stack positions of 70mm, 60mm and 50mm from the closed end.
A study on the effect that the green roof has on the performance of PV module
Yoo, Dong-Cheol ; Lee, Eung-Jik ;
Journal of the Korean Solar Energy Society, volume 32, issue 2, 2012, Pages 113~119
DOI : 10.7836/kses.2012.32.2.113
This study aims to examine the effect of the combined application of green roof and PV system on the PV efficiency by measuring the temperature and performance of PV module in order to reduce the temperature on the roof using roof planting system and determine the potential of efficient increase in solar-light power generation. In the experimental methodology, either monocrystalline or polycrystalline PV module was installed in green roof or non-green roof, and then the surface temperature of PV was measured by TR-71U thermometer and again the performance, module body temperature, and conversion efficiency were measured by MP-160, TC selector MI-540, and PV selector MI-520, respectively. As a result, the average body temperature of monocrystalline module was lower by
in green roof than in non-green roof; that of polycrystalline module was lower by
in green roof than in non-green roof. In the difference of generation, the electricity generation of monocrystalline module in green roof was 46.13W, but that of polycrystalline module was 68.82 W, which indicated that the latter produced 22.69W more than the former.