Calculation of Hourly irradiance in the plane of the Photovoltaic array.

Keyword

Monthly Average Hourly irradiance in the plane of the Photovoltaic array,Diffuse reflectance of the ground,ground albedo,Tilt of Photovoltaic array,Monthly Average Hourly total Global,Diffuse and Beam Solar Horizontal Irradiation,Monthly Average Daily Global,Diffuse and Beam Solar Horizontal Radiation,Ratio of hourly total to daily total global and diffuse radiation,Solar constant,Time Zone,Local Standard Time,Longitude,Latitude,Monthly Average Clearness Index,Monthly average day,Day number,Declination of Sun,Monthly average Sunset Hour Angle,Equation of Time.

Reference

[1]:Rezachek,David Allen:『Development of a solar pond system design computer model』University of Hawaii,1991
[2]:Natural Resources Canada:『RETScreen Engineering & Cases Textbook Third Edition』.

Remarks

・Ht:Hourly irradiance in the plane of the PV array.
・KT:Monthly Average Clearness Index. 0.3(for very overcast climates) and 0.8(for very sunny locations).[2].
・φ:Latitude.North(+),Siuth(-).
・δ:Declination of Sun.North(+),Siuth(-).
・ωs:Solar Hour Angle at Sunset.
・β:Tilt of Photovoltaic array.
・ρ:『Diffuse reflectance of the ground(also called ground albedo)』(Reference[2]).
・『Ground albedo is set to 0.2 if the average monthly temperature is greater than 0°C, 0.7 if it is less than –5°C, with a linear interpolation for temperatures between these values.』(Reference[2]).
・H0(J/m^2/day , Wh/m^2/day):Monthly Average Extraterrestrial Daily Solar Radiation on a Horizontal Surface.
・H(J/m^2/day , Wh/m^2/day):Monthly Average Daily Global Solar Radiation on a Horizontal Surface.
・Hd(J/m^2/day , Wh/m^2/day):Monthly Average Daily Diffuse Solar Radiation on a Horizontal Surface.
・LaTex: \\H_{t}=H_{b}R_{b}+H_{d}(\frac{1+\cos\beta }{2})+H\rho (\frac{1-\cos\beta }{2})\\R_{b}=\frac{\cos\theta }{\cos\theta_{z}}\, ,\, \rho :\textup{Ground albedo}
・Making above Equation Image is powered by CODECOGS

History

・2010/07/09:Upload.