// Calculation method
public void Calculate
(
double NDir // normal direct irradiance [W/m2]
, double HDif // horizontal diffuse irradiance [W/m2]
, double NExtra // normal extraterrestrial irradiance [W/m2]
, double SunZenith // zenith angle of sun [radians]
, double SunAzimuth // azimuth angle of sun [radians]
, double AirMass // air mass [#]
, int MonthNum // The month number of the time stamp [1->12]
)
{
// Calculate direct horizontal if direct normal is provided
double HDir = NDir * Math.Cos(SunZenith);
// call Perez et al. algorithm or Hay algorithm
switch (itsTiltAlgorithm)
{
case TiltAlgorithm.PEREZ:
TGlo = GetTiltCompIrradPerez(out TDir, out TDif, out TRef, HDir, HDif, NExtra, SunZenith, SunAzimuth, AirMass, MonthNum);
break;
case TiltAlgorithm.HAY:
TGlo = GetTiltCompIrradHay(out TDir, out TDif, out TRef, HDir, HDif, NExtra, SunZenith, SunAzimuth, MonthNum);
break;
default:
itsTiltAlgorithm = TiltAlgorithm.HAY;
break;
}
// Compute the incidence angle from the Tilt class
IncidenceAngle = Tilt.GetIncidenceAngle(SunZenith, SunAzimuth, itsSurfaceSlope, itsSurfaceAzimuth);
}
// Constructor with definition variables
public Tilter
(
TiltAlgorithm aTiltAlgorithm
)
{
itsTiltAlgorithm = aTiltAlgorithm;
}
// Calculation method
public void Calculate
(
double NDir // normal direct irradiance [W/m2]
, double HDif // horizontal diffuse irradiance [W/m2]
, double NExtra // normal extraterrestrial irradiance [W/m2]
, double SunZenith // zenith angle of sun [radians]
, double SunAzimuth // azimuth angle of sun [radians]
, double AirMass // air mass [#]
, int MonthNum // The month number of the time stamp [1->12]
, double MeasAlbedo // albedo read from climate file, if available (NaN otherwise)
)
{
// Calculate albedo
// Read from climate file
if (ReadFarmSettings.GetAttribute("Albedo", "Frequency", ErrLevel.WARNING) == "From Climate File")
{
Albedo = MeasAlbedo;
}
// Otherwise, read from monthly array
else
{
Albedo = itsMonthlyAlbedo[MonthNum];
}
// Calculate direct horizontal if direct normal is provided
double HDir = NDir * Math.Cos(SunZenith);
// call Perez et al. algorithm or Hay algorithm
switch (itsTiltAlgorithm)
{
case TiltAlgorithm.PEREZ:
TGlo = GetTiltCompIrradPerez(out TDir, out TDif, out TRef, HDir, HDif, NExtra, SunZenith, SunAzimuth, AirMass, MonthNum);
break;
case TiltAlgorithm.HAY:
TGlo = GetTiltCompIrradHay(out TDir, out TDif, out TRef, HDir, HDif, NExtra, SunZenith, SunAzimuth, MonthNum);
break;
default:
itsTiltAlgorithm = TiltAlgorithm.HAY;
break;
}
// Compute the incidence angle from the Tilt class
IncidenceAngle = Tilt.GetIncidenceAngle(SunZenith, SunAzimuth, itsSurfaceSlope, itsSurfaceAzimuth);
}
// Config will assign parameter variables their values as obtained from the XML file
public void Config()
{
// Getting the Tilt Algorithm for the Simulation
if (ReadFarmSettings.GetInnerText("SiteDef", "TransEnum", ErrLevel.WARNING) == "0")
{
itsTiltAlgorithm = TiltAlgorithm.HAY;
}
else if (ReadFarmSettings.GetInnerText("SiteDef", "TransEnum", ErrLevel.WARNING) == "1")
{
itsTiltAlgorithm = TiltAlgorithm.PEREZ;
}
else
{
ErrorLogger.Log("Tilter: Invalid tilt algorithm chosen by User. CASSYS uses Hay as default.", ErrLevel.WARNING);
itsTiltAlgorithm = TiltAlgorithm.HAY;
}
// Assign the albedo parameters from the .CSYX file
ConfigAlbedo();
}
