ANALYSIS OF THE ATTENUATION OF THE HOURLY GLOBAL, DIRECT AND DIFFUSE SOLAR RADIATIONS IN FUNCTION OF THE OPTICS MASS
DOI:
https://doi.org/10.59627/cbens.2010.1683Keywords:
Solar Energy, Atmospheric Attenuation, ScatteringAbstract
The objective of this work is to verify the atmospheric attenuation by means of the relationship between global solar radiation, direct and diffuse with optical mass. The optical mass depends on locality and changes in time, with direct influence on the radiative flux, causing changes in average values. The measurements of solar radiation were provided by the Laboratory of Radiometry of Botucatu, UNESP - Botucatu / SP (22.9 º S latitude, 48.45 ° W longitude, 745 m elevation). The period used included the years 2002 to 2006. The solar radiation was measured by a Eppley pyranometer model PSP. The direct solar radiation on the incidence was measured using a model pirheliometer Eppely NIP coupled to a solar tracking system model ST-3. The diffuse solar radiation was calculated by the difference between global and direct solar radiation horizontal. There was a decrease in solar radiation with increasing opthical mass, justified by the increased probability of collision of the solar rays with atmospheric constituents. For global radiation and optical mass mo = 1, a minimum around 3.1 MJ/m2 and maximum 4.1 MJ/m2. For optical mass mo = 2, minimum 1.5 MJ/m2, maximum 1.9 MJ/m2. For direct radiation, minimum 2 MJ/m2 and maximum 3.75 MJ/m2. For optical mass mo = 2, minimum 1 MJ/m2 and maximum 1.5 MJ/m2. For diffuse radiation, minimum 0.1 MJ/m2 and maximum 1.5 MJ/m2. For optical mass mo = 2, minimum 0.1 MJ/m2, maximum 0.8 MJ/m2. The combination of direct and diffuse radiation data allowed better understand of the attenuation process.
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