corrFdKt: Correlations between the fraction of diffuse irradiation and...

In solaR: Solar Photovoltaic Systems

Description

A set of correlations between the fraction of diffuse irradiation and the clearness index used by fCompD and fCompI.

Usage

## Monthly means of daily values
FdKtPage(Ktd)
FdKtLJ(Ktd)

## Daily values
FdKtCPR(Ktd)
FdKtEKDd(Ktd, sol)
FdKtCLIMEDd(Ktd)

## Intradaily values
FdKtEKDh(kt)
FdKtCLIMEDh(kt)
FdKtBRL(kt, sol)

Arguments

Ktd	A numeric, the daily clearness index.
kt	A numeric, the intradaily clearness index.
sol	A Sol object provided by calcSol or a zoo object provided by fSolD or fSolI.

Value

A numeric, the diffuse fraction.

Author(s)

Oscar Perpiñán Lamigueiro; The BRL model was suggested by Kevin Ummel.

References

• Page, J. K., The calculation of monthly mean solar radiation for horizontal and inclined surfaces from sunshine records for latitudes 40N-40S. En U.N. Conference on New Sources of Energy, vol. 4, págs. 378–390, 1961.

• Collares-Pereira, M. y Rabl, A., The average distribution of solar radiation: correlations between diffuse and hemispherical and between daily and hourly insolation values. Solar Energy, 22:155–164, 1979.

• Erbs, D.G, Klein, S.A. and Duffie, J.A., Estimation of the diffuse radiation fraction for hourly, daily and monthly-average global radiation. Solar Energy, 28:293:302, 1982.

• De Miguel, A. et al., Diffuse solar irradiation model evaluation in the north mediterranean belt area, Solar Energy, 70:143-153, 2001.

• Ridley, B., Boland, J. and Lauret, P., Modelling of diffuse solar fraction with multiple predictors, Renewable Energy, 35:478-482, 2010.

See Also

fCompD, fCompI

Examples

Ktd=seq(0, 1, .01)
Monthly=data.frame(Ktd=Ktd)
Monthly$Page=FdKtPage(Ktd)
Monthly$LJ=FdKtLJ(Ktd)

xyplot(Page+LJ~Ktd, data=Monthly,
       type=c('l', 'g'), auto.key=list(space='right'))

Ktd=seq(0, 1, .01)
Daily=data.frame(Ktd=Ktd)
Daily$CPR=FdKtCPR(Ktd)
Daily$CLIMEDd=FdKtCLIMEDd(Ktd)

xyplot(CPR+CLIMEDd~Ktd, data=Daily,
       type=c('l', 'g'), auto.key=list(space='right'))

solaR documentation built on May 2, 2019, 6:07 p.m.