Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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Beam and Diffuse to Global Solar Irradiation Correlation Coefficients for Daejeon

대전지역 직달 및 산란과 전일사 상관계수

  • Lee, Kwan-Ho (School of Building & Environment Design, Ulsan College) ;
  • Song, Doo-Sam (Department of Architectural Engineering, Sungkyunkwan University)
  • 이관호 (울산과학대학교 공간디자인학부) ;
  • 송두삼 (성균관대학교 건축공학과)
  • Received : 2019.06.04
  • Accepted : 2019.06.28
  • Published : 2019.08.30
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Abstract

The total solar irradiation on horizontal surfaces is separated into the beam and diffuses components. Although horizontal global irradiance is a commonly measured parameter for many sites, horizontal diffuse irradiance is not so readily obtainable. For such sites that measure global irradiation alone, a simple but reasonably accurate method is required to estimate diffuse irradiance from its global counterpart. This study investigates the applicability of correlation coefficients models correlating hourly diffuse and beam fraction and hourly clearness index in Daejeon. The three diffuse to global correlation coefficients models (Orgill and Holland model, CIBSE Guide J model, and Erbs et al. model) are selected and the three modified beam to global correlation coefficients models are generated. MBE, RMSE, r-squared of Daejeon and Daejeon boundary site-fitted models are compared with the case of original coefficients. The comparison result shows that the beam and diffuse to global solar irradiation correlation coefficients models with boundary site-fitted coefficients are best suitable for Daejeon. Further researches will be conducted to find the boundary site-fitting method using measured data of other cities and correlation coefficients models using solar altitude, cloud cover, and sunshine duration.

Keywords

References

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