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   <ow:Publication rdf:about="oai:digibug.ugr.es:10481/61752">
      <dc:title>Empirical Models for the Estimation of Solar Sky-Diffuse Radiation. A Review and Experimental Analysis</dc:title>
      <dc:creator>Etxebarria Berrizbeitia, Saioa</dc:creator>
      <dc:creator>Jadraque Gago, Eulalia</dc:creator>
      <dc:creator>Muneer, Tariq</dc:creator>
      <dc:subject>Solar radiation</dc:subject>
      <dc:subject>Diffuse ratio</dc:subject>
      <dc:subject>Clearness index</dc:subject>
      <dc:subject>Monthly-averaged hourly</dc:subject>
      <dc:description>Accurate solar radiation data are essential for the development of solar energy application&#xd;
systems. The limited availability of solar radiation data, and especially diffuse irradiance values,&#xd;
makes it vital to develop models to estimate these data. The development of estimation models&#xd;
has been the objective of many studies. This paper presents an extended review of the diffuse ratio&#xd;
(k) vs. clearness index (kt) annual, monthly, daily, and hourly frequency regression models. It is&#xd;
however interesting to note that there is a dearth of such knowledge for diffuse ratio–clearness index&#xd;
regressions that are based on averaged data. Monthly-averaged daily global irradiation data are&#xd;
now easily available from the NASA website for any global location. Using existing models, it is&#xd;
possible to decompose the daily to averaged-hourly global irradiation values. The missing link so&#xd;
far has been hourly averaged diffuse irradiation. This article presents regression equations which&#xd;
could be used to estimate that information. For this purpose, hourly global and diffuse irradiation&#xd;
data was pooled from 19 different locations to obtain three latitude-dependent regression models&#xd;
relating the monthly-averaged hourly diffuse ratio (k) to the clearness index (kt). The results show&#xd;
a high relationship between both variables. These regression equations could be used to estimate&#xd;
the averaged diffuse irradiation values from averaged global irradiation values, which are more&#xd;
easily available.</dc:description>
      <dc:date>2020-05-04T11:45:31Z</dc:date>
      <dc:date>2020-05-04T11:45:31Z</dc:date>
      <dc:date>2020-02-06</dc:date>
      <dc:type>journal article</dc:type>
      <dc:identifier>Berrizbeitia, S. E., Jadraque Gago, E., &amp; Muneer, T. (2020). Empirical Models for the Estimation of Solar Sky-Diffuse Radiation. A Review and Experimental Analysis. Energies, 13(3), 701.</dc:identifier>
      <dc:identifier>http://hdl.handle.net/10481/61752</dc:identifier>
      <dc:identifier>10.3390/en13030701</dc:identifier>
      <dc:language>eng</dc:language>
      <dc:rights>http://creativecommons.org/licenses/by/3.0/es/</dc:rights>
      <dc:rights>open access</dc:rights>
      <dc:rights>Atribución 3.0 España</dc:rights>
      <dc:publisher>MDPI</dc:publisher>
   </ow:Publication>
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