sirad (version 2.0-2)

sucal: Calibrate Supit-Van Kappel model

Description

Function estimates Supit-Van Kappel model coefficients 'A', 'B' and 'C' based on reference data

Usage

sucal(days, lat, rad_mea, tmax, tmin, cc)

Arguments

days

Vector of class 'Date' of length n.

lat

Latitude in decimal degrees.

rad_mea

Vector of length n containing reference (e.g. measured) solar radiation [MJm-2].

tmax

Vector of length n containing daily maximum temperature [C].

tmin

Vector of length n containing daily minumum temperature [C].

cc

Vector of length n containing daily cloud coverage [octas].

Value

• Vector of length 3:
• Sa
  Supit-Van Kappel 'A' coefficient
• Sb
  Supit-Van Kappel 'B' coefficient
• Sc
  Supit-Van Kappel 'C' coefficient
• Sr2
  Coefficient of determination of performed linear regression

Details

Function estimates Supit-Van Kappel model coefficients 'A', 'B' and 'C' based on reference (e.g. measured) solar radiation data. It performs a linear regression.

References

Supit, I. 1994. Global radiation. Publication EUR 15745 EN of the Office for Official Publications of the EU, Luxembourg. Supit, I., Kappel, R.R. van, 1998. A simple method to estimate global radiation. Solar Energy, 63:147-160.

See Also

'su'.

Examples

data(Metdata)
tmax <- Metdata$meteo$TEMP_MAX
tmin <- Metdata$meteo$TEMP_MIN
days <- Metdata$meteo$DAY
lat <- Metdata$LATITUDE
rad_mea <- Metdata$meteo$RAD_MEA
CC <- Metdata$meteo$CLOUD_DAYTIME_TOTAL
sucal(lat=lat,days=days,rad_mea,tmax=tmax, tmin=tmin,cc=CC)