some problem in getsattemperature #54
Description
Why the saturation temperature values obtained using the GetSatTemperature() method cannot be used for the next step of the UpDatePT method? Here is an example of my partially error-free code：
using EngineeringUnits;
using SharpFluids;
namespace methane
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
double Qg, Ql, Vg, Vl, P, N, k, Tg, Tl, tk,Pg, Pl, densG,densL,satT,Dg,Ds,I1,I2,r;
private void button1_Click(object sender, EventArgs e)
{
Qg = double.Parse(textBox1.Text);
k = double.Parse(textBox2.Text);
Vg = double.Parse(textBox6.Text);
Vl = double.Parse(textBox7.Text);
Tg = double.Parse(textBox3.Text);
Tl = double.Parse(textBox4.Text);
P = double.Parse(textBox5.Text) * 0.001;
Pg = double.Parse(textBox8.Text) + 0.101325;
Pl = double.Parse(textBox9.Text) + 0.101325;
//tk = double.Parse(textBox10.Text);
Fluid fluid = new(FluidList.Methane);
fluid.UpdatePT(Pressure.FromMegapascal(Pg), Temperature.FromDegreesCelsius(Tg));
Fluid fluid2 = new(FluidList.Methane);
fluid2.UpdatePT(Pressure.FromMegapascal(Pl), Temperature.FromDegreesCelsius(Tl));
densG = fluid.Density.KilogramPerCubicMeter;
densL = fluid2.Density.KilogramPerCubicMeter;
Fluid fluid5 = new(FluidList.Methane);
fluid5.UpdatePT(Pressure.FromMegapascal(Pl), Temperature.FromDegreesCelsius(Tg));
I1 = fluid5.Enthalpy.KilojoulePerKilogram;
Fluid fluid3 = new Fluid(FluidList.Methane);
fluid3.UpdatePT(Pressure.FromMegapascal(Pl), Temperature.FromDegreesCelsius(Tg));
satT = fluid3.GetSatTemperature(Pressure.FromMegapascal(Pl)).DegreeCelsius;
Fluid fluid6 = new(FluidList.Methane);
fluid6.UpdatePT(Pressure.FromMegapascal(Pl), Temperature.FromDegreesCelsius(satT));
r = fluid6.Enthalpy.KilojoulePerKilogram;
When the above line is running, the last line of code gives an error prompt:“System.NullReferenceException:“Object reference not set to an instance of an object.”
Please help me to answer it, thank you very much