Keyword
Ratio of hourly to daily total Global radiation,Sunset Hour Angle,Time Zone,Local Srandard Time,Longitude,Latitude,Azimuth,Tilt,Monthly average day,Day number,Equation of Time,Declination of Sun,Hour Angle.
|
Reference
[1]：Austin Whillier：『The determination of hourly values of total solar radiation from daily summations』,Theoretical and Applied Climatology,Volume7,Number2,1956,pp.197-204
[2]：Japanese Industrial Standards Committee：『Estimation method of generating electric energy by PV power system』JISC8907：2005
[3]：Natural Resources Canada：『RETScreen Engineering & Cases Textbook Third Edition』.
|
Remarks
・rt：Ratio of hourly to daily total Global radiation.If calculated rt is smaller than zero,Input hour(LST) may be before sunrise or after sunset on Hour(h)-rt Graph.
・LST：Local Srandard Time.
・h：Solar altitude.
・λ：Longitude.East(+),West(-).
・φ：Latitude.North(+),Siuth(-).
・δ：Declination of Sun.North(+),Siuth(-).
・ω：Hour angle.『the angular displacement of the sun relative to the local meridian, zero at noon』.Afternoon(+),Before noon(-).
・ωs：Solar Hour Angle at Sunset.
・LaTex： \\r_{d}=\frac{\pi }{24}\frac{(\frac{24}{\pi }\sin\frac{\pi }{24}\cos\omega-\cos\omega _{s}) }{\sin \omega _{s}-\omega _{s}\cos\omega _{s}}\\\\A=0.409+0.5016\sin(\omega _{s}-\pi /3)\\B=0.6609-0.4767\sin(\omega _{s}-\pi /3)\\r_{t}=r_{d}(A+B\cos\omega )
・Making above Equation Image is powered by CODECOGS
|