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Comparative Analysis of Decomposition Models with Site-fitted Coefficients for Seoul

서울지역 지역계수가 적용된 직산분리 모델의 성능 비교

  • Seo, Dong-Hyun (Department of Architectural Engineering, Chungbuk National University) ;
  • Kim, Hye-Jin (Department of Architectural Engineering, Chungbuk National University)
  • 서동현 (충북대학교 건축공학과) ;
  • 김혜진 (충북대학교 건축공학과)
  • Received : 2019.05.27
  • Accepted : 2019.06.27
  • Published : 2019.06.30

Abstract

Decomposition models are essential in TMY development and solar energy system design. Up until recently, only a few decomposition model related researches are implemented in Korea due to lack of measured direct normal solar irradiance. In contrast, numerous researches have been conducted in various countries, and some quasi-universal composition models have been recommended by several papers. In this research, three decomposition models - Watanabe model, Reindl-2 model and Engerer1 model - are selected and their site-fitted coefficients are developed using measured direct normal solar irradiance in Seoul. R-squared, RMSE, MBE of the site-fitted models are compared with the case of original coefficients and then each other. The comparison result shows that the Reindl-2 model with site-fitted coefficients is best suitable for Seoul. Further researches will be conducted to find the best model using more various measured data of Korean cities and site-fitting methods.

Keywords

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Fig. 1 Verification of Io calculation result against Sandia Method

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Fig. 2 Verification of sin h calculation result against NOAA Method

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Fig. 3 Diagram of site-fit coefficient estimate process

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Fig. 4 Comparative scatter plots of Watanabe Model

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Fig. 5 Comparative scatter plots of Reindl-2 Model

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Fig. 6 Scatter plot Engerer1 Model

Table 1 Features of Measured GHI & DNI data

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Table 2 Site-fitted coefficient of Seoul by Watanabe Model

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Table 3 Site-fitted coefficient of Seoul by Reindl-2 Model

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Table 4 Comparison of Estimation results of Seoul Decomposition models

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