fTheta: Angle of incidence of solar irradiation on a inclined surface

Description

The orientation, azimuth and incidence angle are calculated from the results of fSolI and from the information supplied by the arguments beta and alfa when the surface is fixed (modoSeg='est') or the movement equations when a tracking surface is chosen (modoSeg='horiz' or modoSeg='doble'). Besides, the modified movement of a horizontal NS tracker due to the backtracking strategy are calculated if BT=TRUE with information about the tracker and the distance between the trackers included in the system.

Usage

fTheta(SolI, beta, alfa = 0, modoSeg = "est", BetaLim = 90, 
    BT = FALSE, estruct, distancias)

Arguments

SolI

data.frame as provided by fSolI

beta

numeric, inclination angle of the surface (degrees). It is only needed when modoSeg='est'.

alfa

numeric, azimuth angle of the surface (degrees). It is positive to the West. It is only needed when modoSeg='est'. Its default value is alfa=0

modoSeg

character, to be chosen from 'est', 'doble' or 'horiz'. When modoSeg='est' the surface is fixed (inclination and azimuth angles are constant). The performance of a two-axis tracker is calculated with

BetaLim

numeric, maximum value of the inclination angle for a tracking surface. Its default value is 90 (no limitation))

logical, TRUE when the bactracking technique is to be used with a horizontal NS tracker, as described by Panico et al. (see References). The default value is FALSE. In future versions of this package this technique will be availa

estruct

list, with a component named L, which is the height (meters) of the tracker. In future versions the backtracking technique will be used in conjuction with two-axis trackers, and a additional component named W will be

distancias

data.frame, with a component named Leo, being the distance between the horizontal NS trackers along the East-West direction. In future versions an additional component named Lns will be needed for two-axis trackers w

Value

data.frame, including SolI and several components:
Betanumeric, inclination angle of the surface (radians). When modoSeg='est' it is the value of the argument beta converted from degrees to radians.
Alfanumeric, azimuth angle of the surface (radians). When modoSeg='est' it is the value of the argument alfa converted from degrees to radians.
cosThetanumeric, cosine of the incidence angle of the solar irradiance on the surface

encoding

UTF-8

References

Perpiñán, O, Energía Solar Fotovoltaica, 2010. (http://procomun.wordpress.com/documentos/libroesf/)