R/fSombra2X.R

In solaR: Solar Photovoltaic Systems

 # Copyright (C) 2010, 2009 Oscar Perpiñán Lamigueiro
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License
 # as published by the Free Software Foundation; either version 2
 # of the License, or (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 #/
fSombra2X<-function(angGen,distances,struct){
  stopifnot(is.list(struct),is.data.frame(distances))
###Preparo datos de partida	
  P=with(struct,distances/W)
  b=with(struct,L/W)
  AzS=coredata(angGen$AzS)
  Beta=coredata(angGen$Beta)
  AlS=coredata(angGen$AlS)
###Cálculos
  d1=abs(P$Lew*cos(AzS)-P$Lns*sin(AzS))
  d2=abs(P$Lew*sin(AzS)+P$Lns*cos(AzS))
  FC=sin(AlS)/sin(Beta+AlS)
  s=b*cos(Beta)+(b*sin(Beta)+P$H)/tan(AlS)
  FS1=1-d1
  FS2=s-d2
  SombraCond=(FS1>0)*(FS2>0)*(P$Lew*AzS>=0)
  SombraCond[is.na(SombraCond)]<-FALSE #Los NA no me sirven en un vector lógico. Los sustituyo por FALSE
###Resultado
  FS=SombraCond*(FS1*FS2*FC)/b
  FS[FS>1]<-1
  return(zoo(FS, index(angGen)))
}