R/wbgt_sun.r

In alfcrisci/rBiometeo: Biometeorological Functions in R

#' wbgt_sun
#'
#' Calculate wet bulb globe temperature index for outdoor environements by using solar radiation.
#' Pressure correction follow
#
#' @param t numeric        Air temperature in degC.
#' @param rh numeric       Relative humidity in percentage.
#' @param wind numeric     Mean Wind speed in meter per second.
#' @param solar  numeric   Global solar radiation in Watt on mq.
#' @param zenith numeric   Zenith angle in decimal degrees.
#' @param pair numeric     Air pressure in millibar or hPa. Default 1010 hPa.
#' @param alb_sfc numeric  Mean albedo of surroundings. Default is 0.4.
#' @param fdir numeric     Ratio of directed solar respect to the diffuse.Default is 0.8.
#' @param maxair numeric   Upper bound of search range referred to air temperature in degC. Default is 10.
#' @param minair numeric   Lower bound of search range referred to air temperature in degC. Default is 10.
#' @param prec numeric      Precision of outcomes.Default is 0.01. 
#' @return globe temperature in degC
#' @return wbgt for outdoor/sunny conditions in degC
#'
#'
#' @author Istituto per la Bioeconomia CNR Firenze Italy  Alfonso Crisci \email{alfonso.crisci@@ibe.cnr.it}
#' @keywords  wbgt outdoor
#' 
#' @export
#'
#'
#'
#'

wbgt_outdoor=function(t,rh,wind,solar,zenith=0,pair=1010,alb_sfc=0.4,fdir=0.8,maxair=10,minair=2,prec=0.01) {
   if (length(solar) != length(t)) {solar=rep(solar,length(t));
                                   zenith=rep(zenith,length(t));
                                  }
  irad=1
  ct$assign("t", as.array(t))
  ct$assign("rh", as.array(rh))
  ct$assign("wind", as.array(wind))
  ct$assign("pair", as.array(pair))
  ct$assign("alb_sfc", as.array(alb_sfc))
  ct$assign("fdir", as.array(fdir))
  ct$assign("irad", as.array(irad))
  ct$assign("maxair", as.array(maxair))
  ct$assign("minair", as.array(minair))
  ct$assign("prec", as.array(prec))
  ct$eval("var res=[]; for(var i=0, len=t.length; i < len; i++) { res[i]=wbgt_sun(t[i],rh[i],wind[i],solar[i],zenith[i],pair[0],alb_sfc[0],fdir[0],irad[0],maxair[0],minair[0],prec[0])};")
  res=ct$get("res")
  return(ifelse(!is.numeric(res),NA,res))
}