It does not matter whether the method is estimated empirically or not, all that matters is to be reliable enough and get us results without having to make further measurements beyond what authors used when they proved the validity of their work.
The location of interest for me is North America.
Al-Motasem,
You may wish to check the papers by H. F. Assunca˜o, J. F. Escobedo, and A. P. Oliveira around mid-to-late part of the 2000-2010 decade; as well as the papers by J. Tovar and fellow researchers around mid-1990's to early 2000's.
Various papers in the following book may also provide good background to diffuse radiation measurement:
V. Badescu, "Modeling Solar Radiation at the Earth’s Surface : Recent Advances", Springer 2008.
-Sanjay
.
hi dear,
you can use this model if your location lies between mentioned range.
Page, J. K. "Methods for the estimation of solar energy on vertical and inclined surfaces from sunshine records for latitudes 40S-40N." Proc. 5th Solar Energy Conversion. Dept. Physics, Univ. of Waterloo, Canada (1979): 37-99.
Regards,
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