public double GetSaturationTemperature(double pressure)
{
double temperature = 1.0e-10;
if (moisture.Name.Equals("Water"))
{
temperature = ThermalPropCalculator.CalculateWaterSaturationTemperature(pressure);
}
else
{
temperature = ThermalPropCalculator.CalculateSaturationTemperature(pressure, vapPressureCoeffs);
}
return(temperature);
}
public static double CalculateBoilingPointElevation(DryingMaterial dryingMaterial, double concentrationValue, double pressureValue)
{
SolutionType solutionType = dryingMaterial.SolutionType;
double deltaT = 0;
Substance s = dryingMaterial.Moisture;
double solventMolarWeight = s.MolarWeight;
s = dryingMaterial.AbsoluteDryMaterial;
double soluteMolarWeight = s.MolarWeight;
double tEvap = 0.0;
/*if (solutionType == SolutionType.Raoult) {
* //Unit Operations in Food Engieering Eq. 18.13
* double soluteMassRatio = 1.0/owner.MoistureContentDryBase.Value;
* double boilingConstant = 1.0;
* deltaT = 1000 * boilingConstant * soluteMassRatio/soluteMolarWeight;
* }
* else if (solutionType == SolutionType.Aqueous) {
* //Unit Operations in Food Engieering Eq. 18.14
* double molarConcentration = concentrationValue/soluteMolarWeight/(concentrationValue/soluteMolarWeight+(1-concentrationValue)/solventMolarWeight);
* deltaT = 0.52 * molarConcentration;
* }
* else if (solutionType == SolutionType.InorganicSalts) {
* //Unit Operations in Food Engieering Eq. 18.17
* double molarConcentration = concentrationValue/soluteMolarWeight/(concentrationValue/soluteMolarWeight+(1-concentrationValue)/solventMolarWeight);
* deltaT = 104.9 * Math.Pow(molarConcentration, 1.14);
* }
* else if (solutionType == SolutionType.Ideal) {
* //Unit Operations in Food Engieering Eq. 18.15
* double tEvap = ThermalPropCalculator.CalculateTemperatureFromWaterVaporPressure(pressureValue);
* double evapHeat = owner.GetEvaporationHeat(tEvap);
* double solventMassFraction = 1.0/owner.MoistureContentWetBase.Value;
* deltaT = -tEvap/(1.0 + (evapHeat/(8.314*tEvap*Math.Log(solventMassFraction))));
* }*/
if (solutionType == SolutionType.Sucrose)
{
//Unit Operations in Food Engieering Eq. 18.17
pressureValue = pressureValue / 100; //note: pressure unit is mbar
deltaT = 3.061 * Math.Pow(concentrationValue, 0.094) * Math.Pow(pressureValue, 0.136) * Math.Exp(5.328 * concentrationValue);
}
else if (solutionType == SolutionType.ReducingSugars)
{
//Unit Operations in Food Engieering Eq. 18.17
pressureValue = pressureValue / 100; //note: pressure unit is mbar
deltaT = 2.227 * Math.Pow(concentrationValue, 0.588) * Math.Pow(pressureValue, 0.119) * Math.Exp(3.593 * concentrationValue);
}
else if (solutionType == SolutionType.Juices)
{
//Unit Operations in Food Engieering Eq. 18.17
pressureValue = pressureValue / 100; //note: pressure unit is mbar
//deltaT = 0.04904 * Math.Pow(concentration, 0.029)*Math.Pow(pressureValue, 0.113)*Math.Exp(-0.03899*concentration + 6.52e-4*concentration*concentration);
deltaT = 1.36 * Math.Pow(concentrationValue, 0.749) * Math.Pow(pressureValue, 0.106) * Math.Exp(3.39 * concentrationValue);
}
else if (solutionType == SolutionType.Unknown)
{
//Duhring rules
tEvap = ThermalPropCalculator.CalculateWaterSaturationTemperature(pressureValue);
CurveF[] duhringLines = dryingMaterial.DuhringLines;
if (duhringLines != null)
{
double tEvapReal = ChartUtil.GetInterpolatedValue(duhringLines, concentrationValue, tEvap);
deltaT = tEvapReal - tEvap;
}
/*double correctionCoeff = 1.0;
* if (duhringLines.VarValue == Constants.NO_VALUE && Math.Abs(pressureValue-1.0132685e5) < 1.0e-3) {
* double evapHeat = GetEvaporationHeat(tEvap);
* correctionCoeff = 0.0162*tEvap*tEvap/evapHeat; //Chemical Engineering Eq. 7-15 at p.310
* deltaT *= correctionCoeff;
* }*/
}
return(deltaT);
}
