• Title/Summary/Keyword: Solar Irradiation

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A Basic Study to Predict Solar Insolation using Meteorological Observation Data in Korea (국내 기상 측정결과를 이용한 일사량 예측 방법 기초 연구)

  • Hwangbo, Seong;Kim, Hayang;Kim, Jeongbae
    • Journal of Institute of Convergence Technology
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    • v.4 no.2
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    • pp.27-33
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    • 2014
  • To well design the solar energy system using solar energy, the correlation to calculate solar irradiation is basically needed. So, this study was performed to reveal the relationships between the solar irradiation and four meteorological observation data(dry bulb temperature, relative humidity, sunshine duration, and cloud cover) which are different from previous other researches. And then, we finally proposed the first order non-linear correlation from the measured solar irradiation using four meteorological observation data with MINITAB. To show the deviation of the solar irradiation between measured and calculated, this study compared using the daily total solar irradiance and the maximum peak value. From those results, the calculation error was estimated about maximum 25.4% for the daily total solar irradiance. The error of the solar irradiation between measured and calculated was made from the curve fitting error. So, solar irradiation prediction correlation with higher accuracy can be obtained using 2nd or higher order terms with four meteorological observation data.

Performance comparisons of the glass evacuated tube solar collectors of different absorber tubes (진공관형 태양열 집열기의 흡수관 형상 변화에 따른 성능 비교)

  • Kim, Yong;Seo, Tae-Beom;Yun, Seong-Eun;Kim, Young-Min
    • New & Renewable Energy
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    • v.2 no.1 s.5
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    • pp.56-65
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    • 2006
  • The thermal performance of glass evacuated tube solar collectors are numerically and experimentally investigated. Four different shapes of solar collectors are considered and the performances of these solar collectors are compared. Dealing with a single collector tube, the effects of not only the shapes of the absorber tube but also the incidence angle of solar irradiation (beam irradiation) on thermal performance of the collector are studied. However, the solar irradiation consists of the beam irradiation as well as the diffuse irradiation. Also, the interference of solar irradiation and heat transfer interaction between the tubes exist in an actual solar collector, These effects are considered in this study experimentally and numerically. The accuracy of the numerical model is verified by the experimental results. The result shows that the thermal performance of the absorber used a plate fin and U-tube is the best.

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Comparative analysis of the global solar horizontal irradiation in typical meteorological data (표준기상데이터의 일사량 데이터 비교 분석)

  • Yoo, Ho-Chun;Lee, Kwan-Ho;Kang, Hyun-Gu
    • Journal of the Korean Solar Energy Society
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    • v.29 no.6
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    • pp.102-109
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    • 2009
  • The research on meteorological data in Korea has been carried out but without much consistency and has been limited to some areas only. Of relatively more importance has been the area in the utilization of the solar energy, however, the measurement of the global solar horizontal irradiation has been quite limited. In the current study, the actually measured value of the global solar horizontal irradiation from the meteorological data and the theoretically calculated value of the global solar horizontal irradiation from the cloud amount will be analyzed comparatively. The method of analysis will employ the standard meteorological data drafted by the Korean Solar Energy Society, the standard meteorological data from the presently used simulation program and the corresponding results have been compared with the calculated value of the global solar horizontal irradiation from the cloud amount. The results of comparing the values obtained from MBE(Mean Bias Error), RMSE(Root Mean Squares for Error), t-Statistic methods and those from each of the standard meteorological data show that the actually measured value of the meteorological data which have been converted into standard meteorological data with the help of the ISO TRY method give the monthly average value of the global solar horizontal irradiation. These values compared with the monthly average value from the IWEC from the Department of Energy of the USA show that the value of the global solar horizontal irradiation in the USA is quite similar. In the case of the values obtained from calculation from the cloud amount, the weather data provided by TRNSYS, except only slight difference, which means that the actually measured values of the global solar horizontal irradiation are significant. This goes to show that in the case of Korea, the value of the global solar horizontal irradiation provided by the Korea Meteorological Administration is will be deemed correct.

One-time measurement of irradiation intensity of Solar Simulator using cds photo-sensors (cds 광전소자(光電素子)를 이용한 인공태양(人工太陽) 일사강도(日射强度)의 동시측정(同時測定))

  • Bai, K.;Cho, S.H.;Lee, N.H.;Auh, P.C.M.
    • Solar Energy
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    • v.5 no.2
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    • pp.28-34
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    • 1985
  • There are two kinds of irradiation intensity deviation, depending on time and position, on illuminated plane when thermal performance of solar collector is tested by using solar simulator. In this study we measured only position deviation of irradiation intensity using 45-cds photosensors and data acqusition system and found the point of average value. By this result we can improve the accuracy of irradiation measurement in indoor test of solar collector.

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Absorbing Rate of Solar Irradiation on Glass Evacuated Tube Collectors Depending on the Absorbing Tube Shape (진공관형 태양열 집열기의 집열관 형상에 따른 태양 복사 에너지 흡수량의 변화)

  • Seo, Tae-Beom;Kang, Hee-Dong;Kim, Yong
    • Journal of the Korean Solar Energy Society
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    • v.25 no.1
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    • pp.35-44
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    • 2005
  • The absorbing rate of solar irradiation on the surface of an absorbing tube in a glass evacuated solar collector is numerically investigated. Four different shapes of the absorbing tubes are considered, and the absorbed solar irradiation on the surface is calculated for several distances between the absorbing tubes and the incidence angle of solar beam radiation. From the calculation, it is known that the absorbing rate of solar irradiation on the tube surfaces depends upon the shape and the arrangement of absorbing tube and the incidence angle.

Applicability of the Solar Irradiation Model in Preparation of Typical Weather Data Considering Domestic Climate Conditions (표준기상데이터 작성을 위한 국내 기후특성을 고려한 일사량 예측 모델 적합성 평가)

  • Shim, Ji-Soo;Song, Doo-Sam
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.28 no.12
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    • pp.467-476
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    • 2016
  • As the energy saving issues become one of the important global agenda, the building simulation method is generally used to predict the inside energy usage to establish the power-saving strategies. To foretell an accurate energy usage of a building, proper and typical weather data are needed. For this reason, typical weather data are fundamental in building energy simulations and among the meteorological factors, the solar irradiation is the most important element. Therefore, preparing solar irradiation is a basic factor. However, there are few places where the horizontal solar radiation in domestic weather stations can be measured, so the prediction of the solar radiation is needed to arrive at typical weather data. In this paper, four solar radiation prediction models were analyzed in terms of their applicability for domestic weather conditions. A total of 12 regions were analyzed to compare the differences of solar irradiation between measurements and the prediction results. The applicability of the solar irradiation prediction model for a certain region was determined by the comparisons. The results were that the Zhang and Huang model showed the highest accuracy (Rad 0.87~0.80) in most of the analyzed regions. The Kasten model which utilizes a simple regression equation exhibited the second-highest accuracy. The Angstrom-Prescott model is easily used, also by employing a plain regression equation Lastly, the Winslow model which is known for predicting global horizontal solar irradiation at any climate regions uses a daily integration equation and showed a low accuracy regarding the domestic climate conditions in Korea.

The degradation of EVA for the protection of solar cell by UV-rays irradiation (자외선 조사에 따른 태양전지 보호용 EVA의 열화)

  • 김규조;연복희;김승환;김완태;허창수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.177-180
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    • 2000
  • We studied the degradation of EVA for the protection of solar cell by UV-rays irradiation. We investigated the reduction of electrical efficiency, photo transmmitance and degradation of EVA by UV-rays irradiation. We utilized the UV irradiation equiped with fluorescent 313nm UV lamp and radiated for 400 hours. For the chemial analysis, we used the UV-vis spectrometer, XPS and examined the degradation mechanism by UV irradiation. It is found that the discolored phenomena, the decrease of photo transmmitance and oxidation reaction is occured by UV irradiation on the EVA sample for the protection of solar cell.

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Analysis and Calculation of Global Hourly Solar Irradiation Based on Sunshine Duration for Major Cities in Korea (국내 주요도시의 일조시간데이터를 이용한 시간당전일사량 산출 및 분석)

  • Lee, Kwan-Ho;Sim, Kwang-Yeal
    • Journal of the Korean Solar Energy Society
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    • v.30 no.2
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    • pp.16-21
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    • 2010
  • Computer simulation of buildings and solar energy systems are being used increasingly in energy assessments and design. This paper discusses the possibility of using sunshine duration data instead of global hourly solar irradiation (GHSI) data for localities with abundant data on sunshine duration. For six locations in South Korea where global radiation is currently measured, the global radiation was calculated using Sunshine Duration Radiation Model (SDRM), compared and analyzed. Results of SDRM has been compared with the measured data on the coefficients of determination (R2), root-mean-square error (RMSE) and mean bias error (MBE). This study recommends the use of sunshine duration based irradiation models if measured solar radiation data is not available.

Prediction Correlation of Solar Insolation using Relationships between Meteorological Data and Solar Insolation in 2012 (2012년 기상관측 결과와 한국형 수평면전일사량 예측식(I))

  • Kim, Ha-Yang;Kim, Jeongbae
    • Journal of the Korean Solar Energy Society
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    • v.36 no.1
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    • pp.1-9
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    • 2016
  • To well design the solar energy system, the correlation to calculate and predict solar irradiation is basically needed. So, this study was performed to reveal the relationships between the solar irradiation and four meteorological observation data(dry-bulb temperature, relative humidity, duration of sunshine, and amount of cloud) that didn't show from previous any other researches. And then, we finally proposed the various order non-linear correlation from the measured solar irradiation and four meteorological measurement data using MINITAB. To show the deviation and accuracy of the solar irradiation between measured and calculated, this study compared for the daily total solar insolation. From those results, the calculation error could well predicted about maximum 97% for the daily total solar insolation. But, the coefficients of the proposed correlations didn't show any relationships. So, needs more studies to make the proper one correlation for the country.

The analysis of amount of solar irradiation of vertical and horizontal surface per azimuth (방위별 수직면, 수평면 일사량에 관한 연구)

  • Yoo, Ho-Chun;Shin, In-Hwan;Hwang, Hyun-Suk
    • 한국태양에너지학회:학술대회논문집
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    • 2011.11a
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    • pp.274-277
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    • 2011
  • We measured a solar irradiation of vertical and horizontal surface per azimuth in southern area of Korea using pyrheliometer. In comparison with the provided data from ASHRAE and CIBSE, the average amount of solar irradiation has much variation of 10 to 150% in reference with north direction. In the clear day, the measured value has much difference with the value of ASHRAE and there is similar trend in case of CIBSE. The reason why amount of irradiation of clear day is differ from the average value, is able to be assumed that the value of ASHRAE and CIRSE is made of assumption based on clear days. The result of analysis of ASHRAE and CIBSE values according to the amount irradiation value for vertical and horizontal surface per azimuth using the MBE, RSME, and t-Statistic show that the CIBSE value has more reliability for the MBE, RMSE, and t-Statistic values than ASHRAE value.

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