caa a22 4500 445799579 CHVBK 20180317145136.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s00704-010-0284-9 doi (NATIONALLICENCE)springer-10.1007/s00704-010-0284-9 Validation of a method to estimate direct normal irradiance of UVA and PAR bands from global horizontal measurements for cloudless sky conditions in Valencia, Spain, by a measurement campaign [Elektronische Daten] [María-Antonia Serrano, José Boscà] A method is proposed to provide measurement of direct normal solar irradiance of bands with wavelength ranges (315-400nm, 400-700nm) from measurements of global horizontal band irradiance for cloudless sky conditions in Valencia. Global and normal direct irradiance data for every air mass were obtained by applying the SMART2 model to the atmosphere of Valencia. The direct normal to global irradiance ratio was parameterized versus the relative optical air mass. A measurement campaign of global horizontal and diffuse irradiance of UVA and PAR bands was carried out in Valencia, after which, the inferred direct normal irradiance was compared with those provided by the method. The result of the comparison shows that the method is acceptably accurate. The proposed model tends to underestimate the direct normal irradiance of the UVA band by 6%, although for values below 25W/m2 the model overestimates the direct irradiance by 6%, while for values above 25W/m2 the model underestimates it by 10%. The other two error estimators used ranging from 11% to 15% are similar in the defined interval measurements in relation to the whole UVA band. Regarding the PAR band, the model overestimates the direct normal irradiance of the PAR band by only 2.2%. With this, the results of the PAR band are more conclusive, as it has been found that for direct normal irradiance values higher than 280W/m2 the MBE error is almost zero and the other two estimator errors are small, about 5%. Springer-Verlag, 2010 Serrano María-Antonia Department of Applied Physics - IDF, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022, Valencia, Spain aut Boscà José Department of Applied Physics - IDF, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022, Valencia, Spain aut Theoretical and Applied Climatology Springer Vienna 103/1-2(2011-01-01), 95-101 0177-798X 103:1-2<95 2011 103 704 https://doi.org/10.1007/s00704-010-0284-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00704-010-0284-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Serrano María-Antonia Department of Applied Physics - IDF, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022, Valencia, Spain aut NATIONALLICENCE 700 1- Boscà José Department of Applied Physics - IDF, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022, Valencia, Spain aut NATIONALLICENCE 773 0- Theoretical and Applied Climatology Springer Vienna 103/1-2(2011-01-01), 95-101 0177-798X 103:1-2<95 2011 103 704 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer