Evaluation of the Solar Energy Nowcasting System (SENSE) during a 12-Months Intensive Measurement Campaign in Athens, Greece

Ioannis-Panagiotis Raptis (), Stelios Kazadzis, Ilias Fountoulakis, Kyriakoula Papachristopoulou, Dimitra Kouklaki, Basil E. Psiloglou, Andreas Kazantzidis, Charilaos Benetatos, Nikolaos Papadimitriou and Kostas Eleftheratos
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Ioannis-Panagiotis Raptis: Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, GR-15784 Athens, Greece
Stelios Kazadzis: Physics and Meteorology Observatory of Davos, World Radiation Center (PMOD/WRC), CH-7260 Davos, Switzerland
Ilias Fountoulakis: Research Centre for Atmospheric Physics and Climatology, Academy of Athens, GR-11527 Athens, Greece
Kyriakoula Papachristopoulou: Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, GR-15784 Athens, Greece
Dimitra Kouklaki: Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, GR-15784 Athens, Greece
Basil E. Psiloglou: Institute for Environmental Research & Sustainable Development, National Observatory of Athens, GR-15236 Athens, Greece
Andreas Kazantzidis: Physics Department, University of Patras, GR-26500 Patras, Greece
Charilaos Benetatos: Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, GR-15784 Athens, Greece
Nikolaos Papadimitriou: Physics Department, University of Patras, GR-26500 Patras, Greece
Kostas Eleftheratos: Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, GR-15784 Athens, Greece

Energies, 2023, vol. 16, issue 14, 1-19

Abstract: Energy nowcasting is a valuable asset in managing energy loads and having real-time information on solar irradiation availability. In this study, we evaluate the spectrally integrated outputs of the SENSE system for solar irradiance nowcasting for the period of the ASPIRE (atmospheric parameters affecting spectral solar irradiance and solar energy) campaign (December 2020–December 2021) held in Athens, Greece. For the needs of the campaign, several ground-based instruments were operating, including two pyranometers, a pyrheliometer, a cloud camera, a CIMEL sunphotometer, and a precision spectral radiometer (PSR). Global horizontal irradiance (GHI) estimations were more accurate than direct normal irradiance (DNI). SENSE estimations are provided every 15 min, but when comparing bigger time intervals (hours-days), the statistics improved. A dedicated assessment of the SENSE’s inputs is performed in respect to ground-based retrievals, considering cloud conditions (from a sky imager), AOD, and precipitable water vapor from AERONET. The factor that established the larger errors was the visibility of the solar disc, which cannot be defined by the available sources of model inputs. Additionally, there were discrepancies between the satellite estimation of the clouds and the ground picture, which caused deviations in results. AOD differences affected more the DNI.

Keywords: solar energy; nowcasting; evaluation; solar irradiance; spectral solar irradiance; cloud effect on solar nowcasting; aerosol effect on solar nowcasting (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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