INFLUENCE OF CHANGES IN SPECTRAL RESPONSE OF PHOTOVOLTAIC PYRANOMETERS
DOI:
https://doi.org/10.59627/cbens.2014.2109Keywords:
Solar spectrum, solar radiation, radiometers, irradianceAbstract
The solar radiation that reaches the Earth's surface is closely related to the climatic conditions of the place. The variation of the spectral profile of the electromagnetic radiation can cause significant errors in irradiance measurements made by photovoltaic silicon sensors. The spectral profile changes due to environmental variations like the presence of aerosols, thickness of the air mass between and others. The main objective of this work is to analyze the impact of the spectral variation in measurements performed with photovoltaic sensors and analyze the influence of environmental variations. The data used in this study were collected by two Environmental Monitoring Units. The solar spectrum was collected by a spectrometer operating between ultraviolet and near infrared. Data analysis was based on the variation of the spectral profile as a function of time of day during the collection period. The study of the spectral mismatch showed that this factor may be responsible for much of the measurement errors in photovoltaic radiometers using photovoltaic silicon sensor element. The average error estimated by analysis of the solar spectrum for photovoltaic radiometer due to spectral mismatch was 2.5 %. The analysis of the irradiance data recorded for the same period and time of collection of the spectra showed that the average difference was 3.3 % between PV and thermopile radiometer.
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References
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