The function estimates hourly solar radiation (W m-2 hr-1) as a function of daily global solar radiation (W m-2 d-1). Based on Tham et al. (2010) and Tham et al. (2011) .

diurnal_radiation_variation(doy, solrad, hour, lon, lat)

Arguments

doy

numeric the day of year.

solrad

numeric solar radiation (W m-2 d-1).

hour

numeric hour (0-24).

lon

numeric longitude (degrees).

lat

numeric latitude (degrees).

Value

numeric hourly solar radiation (W m-2).

References

Tham Y, Muneer T, Davison B (2010). “Estimation of hourly averaged solar irradiation: evaluation of models.” Building Services Engingeering Research Technology, 31(1). doi:10.1177/0143624409350547 .

Tham Y, Muneer T, Davison B (2011). “Prediction of hourly solar radiation on horizontal and inclined surfaces for Muscat/Oman.” The Journal of Engineering Research, 8(2), 19-31. doi:10.24200/tjer.vol8iss2pp19-31 .

Examples

diurnal_radiation_variation(doy    = 112, 
                            solrad = 8000, 
                            hour   = 12, 
                            lon    = -122.33, 
                            lat    = 47.61)
#> [1] 1006.89