Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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Temperature Correction of Solar Radiation on Clear Sky Using by Modified Pyranometer

특수일사계를 이용한 맑은 날 일사량의 온도 보정

  • Zo, Il-Sung (Research Institute for Radiation-Satellite, Gangneung-Wonju National University) ;
  • Jeong, Myeong-Jae (Department of Atmospheric & Environmental Sciences, Gangneung-Wonju National University) ;
  • Lee, Kyu-Tae (Department of Atmospheric & Environmental Sciences, Gangneung-Wonju National University) ;
  • Jee, Joon-Bum (Weather Information Service Engine, Hankuk University of Foreign Studies) ;
  • Kim, Bu-Yo (Department of Atmospheric & Environmental Sciences, Gangneung-Wonju National University)
  • 조일성 (강릉원주대학교 복사-위성연구소) ;
  • 정명재 (강릉원주대학교 복사-위성연구소, 강릉원주대학교 대기환경과학과) ;
  • 이규태 (강릉원주대학교 복사-위성연구소, 강릉원주대학교 대기환경과학과) ;
  • 지준범 (한국외국어대학교 차세대도시농림융합기상사업단) ;
  • 김부요 (강릉원주대학교 대기환경과학과)
  • Received : 2014.10.22
  • Accepted : 2015.02.11
  • Published : 2015.02.28
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Abstract

Pyranometer have many uncertainty factors (sensitivity function, thermal offset, other spectral effect, geometric, environment, and equipment etc.) than pyrheliometer. The solution for most of the uncertainty factors have been researched, but the problem for thermal offset is being continued research so far. Under the clear sky, due to the thermal offset of pyranometer, the diffuse and global radiation have been negative value for the nighttime and lower value for the daytime, respectively. In order to understand the uncertainty of the thermal offset effect, solar radiation are observed and analyzed using Ji and Tsay method and data from modified pyranometer. As a result of performing temperature correction using the modified pyranometer, the slope (dome factor; k) and intercept ($r_0$) from a linear regression method are 0.064 and $3.457g{\cdot}m^{-2}{\cdot}k^{-1}$, respectively. And the solar radiation is decreased significantly due to the effect of thermal offset during nighttime. The solar radiation from modified pyranometer increased approximately 8% higher than its observed by general pyranometer during daytime. By the way, these results did not generalize because its result is for only single case in clear sky. Accordingly, it is to required for accurate results obtained by the various cases (clear, cloudy and rainy) with longterm observations.

Keywords

References

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