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Practical models to estimate horizontal irradiance in clear sky conditions: Preliminary results

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  • Salazar, Germán A.
  • Hernández, Alejandro L.
  • Saravia, Luis R.

Abstract

The Argentinean Northwest (ANW) is a high altitude region located alongside Los Andes Mountains. The ANW is also one of the most insolated regions in the world due to its altitude and particular climate. However, the characterization of the solar resource in the region is incomplete as there are no stations to measure solar radiation continuously and methodically. With irradiance data recently having been measured at three sites in the Salta Province, a study was carried out that resulted in a practical model to quickly and efficiently estimate the horizontal irradiance in high altitude sites in clear sky conditions. This model uses the altitude above sea level (A) as a variable and generates a representative clearness index as a result (kt-R) that is calculated for each site studied. This index kt-R is then used with the relative optical air mass and the extraterrestrial irradiance to estimate the instantaneous clearness index (kt). Subsequently, the index kt-R is corrected by introducing the atmospheric pressure in the definition of relative optical air mass proposed by Kasten. The results are satisfactory as errors in the irradiance estimations with respect to measured values do not exceed 5% for pressure corrected air masses AMc<2. This model will be used in a feasibility study to locate sites for the installation of solar thermal power plants in the ANW. A prototype of a CLFR solar power plant is being built in the INENCO Campus, at the National University of Salta.

Suggested Citation

  • Salazar, Germán A. & Hernández, Alejandro L. & Saravia, Luis R., 2010. "Practical models to estimate horizontal irradiance in clear sky conditions: Preliminary results," Renewable Energy, Elsevier, vol. 35(11), pages 2452-2460.
    • Handle: RePEc:eee:renene:v:35:y:2010:i:11:p:2452-2460
    DOI: 10.1016/j.renene.2010.01.033
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    References listed on IDEAS

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    Cited by:

    1. Sarmiento, Nilsa & Belmonte, Silvina & Dellicompagni, Pablo & Franco, Judith & Escalante, Karina & Sarmiento, Joaquín, 2019. "A solar irradiation GIS as decision support tool for the Province of Salta, Argentina," Renewable Energy, Elsevier, vol. 132(C), pages 68-80.
    2. Salazar, Germán & Raichijk, Carlos, 2014. "Evaluation of clear-sky conditions in high altitude sites," Renewable Energy, Elsevier, vol. 64(C), pages 197-202.
    3. Salazar, Germán & Checura Diaz, Miguel S. & Denegri, María J. & Tiba, Chigueru, 2015. "Identification of potential areas to achieve stable energy production using the SWERA database: A case study of northern Chile," Renewable Energy, Elsevier, vol. 77(C), pages 208-216.
    4. Nollas, Fernando M. & Salazar, German A. & Gueymard, Christian A., 2023. "Quality control procedure for 1-minute pyranometric measurements of global and shadowband-based diffuse solar irradiance," Renewable Energy, Elsevier, vol. 202(C), pages 40-55.

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