function AmbientTemperature($w, $ws, $METEO, $TIME)
{
//Daily maximum and minimum temperatures
if ($TIME['Ndays'] == 365) {
//All year
$TM = MonthlyAverageToAll($METEO['TMm']);
$Tm = MonthlyAverageToAll($METEO['Tmm']);
} elseif ($TIME['Ndays'] == 12) {
//Only characteristic days
$TM = $METEO['TMm'];
$Tm = $METEO['Tmm'];
}
//Calculations
for ($d = 0; $d < $TIME['Ndays']; $d++) {
//Daily coefficients
$a3[$d] = -pi() / ($ws[$d] + 2 * pi() - pi() / 6);
$b3[$d] = -$a3[$d] * $ws[$d];
$a4[$d] = pi() / ($ws[$d] - pi() / 6);
$b4[$d] = -$a4[$d] * pi() / 6;
$a5[$d] = pi() / (2 * pi() + $ws[$d] - pi() / 6);
$b5[$d] = -(pi() + $a5[$d] * pi() / 6);
for ($h = 0; $h < $TIME['Nsteps']; $h++) {
if (-pi() < $w[$d][$h] && $w[$d][$h] < $ws[$d]) {
$Ta[$d][$h] = $TM[$d] - ($TM[$d] - $Tm[$d]) / 2 * (1 + cos($a3[$d] * $w[$d][$h] + $b3[$d]));
} elseif ($ws[$d] < $w[$d][$h] && $w[$d][$h] < pi() / 6) {
$Ta[$d][$h] = $Tm[$d] + ($TM[$d] - $Tm[$d]) / 2 * (1 + cos($a4[$d] * $w[$d][$h] + $b4[$d]));
} else {
$Ta[$d][$h] = $TM[$d] - ($TM[$d] - $Tm[$d]) / 2 * (1 + cos($a5[$d] * $w[$d][$h] + $b5[$d]));
}
}
//end FOR $h
}
//end FOREACH $d
return $Ta;
}
function CloudyHorizontalIrradiances($Eo, $ws, $w, $SUNPOS, $AMI, $METEO, $TIME)
{
//Model coefficients
$trd0 = -0.015843;
$trd1 = 0.030543;
$trd2 = 0.0003797;
$a00 = 0.26463;
$a01 = -0.061581;
$a02 = 0.0031408;
$a10 = 2.0402;
$a11 = 0.018945;
$a12 = -0.011161;
$a20 = -1.3025;
$a21 = 0.039231;
$a22 = 0.008507900000000001;
// Solar variables
$gammas = $SUNPOS['gammas'];
$costetazs = $SUNPOS['costetazs'];
// Daily Linke Turbidity
$Tlkd = MonthlyAverageToAll($METEO['Tlk']);
// Calculations
foreach ($TIME['SimulationDays'] as $dm) {
$d = $dm - 1;
// Diffuse transmission function at zenith, Trd(d)
$Trd[$d] = $trd0 + $trd1 * $Tlkd[$d] + $trd2 * pow($Tlkd[$d], 2);
// A0 coefficient
$A0[$d] = $a00 + $a01 * $Tlkd[$d] + $a02 * pow($Tlkd[$d], 2);
if ($A0[$d] * $Trd[$d] < 0.002) {
$A0[$d] = 0.002 / $Trd[$d];
}
// A1 coefficient
$A1[$d] = $a10 + $a11 * $Tlkd[$d] + $a12 * pow($Tlkd[$d], 2);
// A2 coefficient
$A2[$d] = $a20 + $a21 * $Tlkd[$d] + $a22 * pow($Tlkd[$d], 2);
for ($h = 0; $h < $TIME['Nsteps']; $h++) {
if (abs($w[$d][$h]) >= abs($ws[$d])) {
$G0[$d][$h] = 0;
$B0[$d][$h] = 0;
$D0[$d][$h] = 0;
} else {
// Rayleigh constant, deltaR
$deltaR[$d][$h] = RayleighConstant($AMI[$d][$h]);
// Beam horizontal clear irradiance
//////////////////////////////////////////////////
$B0[$d][$h] = 0;
//(*)
//////////////////////////////////////////////////
// Diffuse angular function, Fd(h,d)
$Fd[$d][$h] = $A0[$d] + $A1[$d] * sin($gammas[$d][$h]) + $A2[$d] * pow(sin($gammas[$d][$h]), 2);
// Diffuse horizontal clear irradiance
$D0[$d][$h] = 1367 * $Eo[$d] * $Trd[$d] * $Fd[$d][$h];
// Global horizontal clear irradiance
$G0[$d][$h] = $B0[$d][$h] + $D0[$d][$h];
}
}
}
return $HI = array('G0' => $G0, 'B0' => $B0, 'D0' => $D0);
}
function HorizontalIrradiances($SUNMOT, $SUNPOS, $AMI, $SITE, $METEO, $OPTIONS, $TIME)
{
if ($METEO['Data'] == 1 || $METEO['Data'] == 3) {
if ($METEO['Sky'] == 1 || $METEO['Sky'] == 3) {
//Mean sky
//Daily Extraterrestial Horizontal Irradiation, Wh/m2
$BOd0 = ExtraHorIrradiation($SUNMOT['Eo'], $SUNMOT['ws'], $SUNMOT['delta'], $SITE, $TIME);
//Daily Global Horizontal Irradiation, Wh/m2
if ($TIME['Ndays'] == 365) {
//All year
$Gd0 = MonthlyAverageToAll($METEO['Gdm0']);
} elseif ($TIME['Ndays'] == 12) {
//Only characteristic days
$Gd0 = $METEO['Gdm0'];
}
//Daily Clearness Index
$KTd = DailyClearnessIndex($Gd0, $BOd0, $TIME);
//Daily Diffuse fraction
$KDd = DailyDiffuseFraction($KTd, $SUNMOT['ws'], $OPTIONS, $TIME);
//Daily horizontal irradiations, Wh/m2
$DHI = DailyHorizontalIrradiations($Gd0, $KDd, $TIME);
//Horizontal irradiances, W/m2
$HI = MeanHorizontalIrradiances($SUNMOT['w'], $SUNMOT['ws'], $DHI, $TIME);
if ($METEO['Sky'] == 3) {
//Anulates the beam component
$HI['B0'] = array_fill(0, $TIME['Ndays'], array_fill(0, $TIME['Nsteps'], 0));
//And global matches the diffuse
$HI['G0'] = $HI['D0'];
}
} elseif ($METEO['Sky'] == 2) {
//Clear sky
$HI = ClearHorizontalIrradiances($SUNMOT['Eo'], $SUNMOT['ws'], $SUNMOT['w'], $SUNPOS, $AMI, $METEO, $TIME);
}
//elseif ($METEO['Sky'] == 3)
//{
//Cloudy sky
// $HI=CloudyHorizontalIrradiances($SUNMOT['Eo'], $SUNMOT['ws'], $SUNMOT['w'], $SUNPOS, $AMI, $METEO, $TIME);
// }
} else {
$HI['G0'] = $METEO['G0'];
$HI['B0'] = $METEO['B0'];
$HI['D0'] = $METEO['D0'];
}
return $HI;
}