Find Using equations the instantaneous solar radiation ie Be

Find (Using equations) the instantaneous solar radiation (i.e., Beam radiation + Sky Diffuse Radiation + Ground Reflected Solar Radiation) at 12:00 p.m. CST (this time is the Denton Local CST, it is NOT the local solar time) on a solar collector surface (beta = 40 degree, a_w = +15 degree) on July 2^st in Denton, TX (Latitude = 33 degree 12\' 53\" N and Longitude 97 degree 7\' 58\" W). Also assume: clear sky condition (Cn =1); ground reflectance rho = 0.2.

Solution

The number of sun hours is simply the time between sunrise:

Sunrise=121150cos1(sinsincoscos)Sunrise=121150cos1(sinsincoscos)

and sunset:

Sunset=12+1150cos1(sinsincoscos)Sunset=12+1150cos1(sinsincoscos)

The direct component of the solar radiation is determined from the air mass:

ID=1.353×0.7(AM0.678)ID=1.353×0.7(AM0.678)

The airmass can be determined from the Air Mass formula:

AM=1cos