Adding initial Project to git

2025-12-29 19:58:26 +00:00
parent 15f9dce88c
commit b54c9bbb1c
24 changed files with 1396 additions and 0 deletions
--- a/PressureVessel.cs
+++ b/PressureVessel.cs
@@ -0,0 +1,97 @@
+using System;
+
+namespace BWR_simulator
+{
+    public class PressureVessel
+    {
+        public readonly double TOTAL_VOLUME; // Liters
+        private const double VESSEL_COOLING_COEFF = 1000;
+        private const double ROD_HEATING_COEFF = 2000;
+
+        // fluid density coeffcients to calculate fluid density at different pressures and temps
+        private readonly double[] FDC = 
+        [
+            999.83311,
+            0.0752,
+            0.0089,
+            7.36413e-5,
+            4.74639e-7,
+            1.34888e-9,
+            1.36e-11
+        ];
+        public double HotwellTemp { get; private set; }
+
+        public double GasMass { get; private set; }
+        public double GasVolume { get; private set; }
+        public double GasDensity { get; private set; }
+        public double Pressure { get; private set; }
+
+        public double FluidMass { get; private set; }
+        public double FluidDensity { get; private set; }
+        public double FluidVolume { get; private set; }
+        public double FluidTemp { get; private set; }
+        public double FluidBoilingPoint { get; private set; }
+        
+        public double FeedwaterFlow { get; private set; }
+        public double ReliefValvePos { get; private set; }
+        public double InputEnergy { get; private set; }
+
+        public PressureVessel(double totalVolume = 9500,
+                              double fluidTemp = 300, 
+                              double fluidMass = 6200, 
+                              double gasMass = 0)
+        {
+            TOTAL_VOLUME = totalVolume;
+            FluidTemp = fluidTemp;
+            FluidMass = fluidMass;
+            GasMass = gasMass;
+
+            InputEnergy = 0;
+            ReliefValvePos = 0;
+            FeedwaterFlow = 0;
+            Pressure = 1; // calcualte initial pressure
+            FluidBoilingPoint = Constants.WATER_BOILING_POINT_NORM; // calculate boiling point givien initial pressure
+            FluidDensity = 1;
+
+            HotwellTemp = 300;
+            CalculateDensity();
+
+        }
+        private void CalculateDensity()
+        {
+            FluidVolume = FluidMass / FluidDensity;
+            GasVolume = TOTAL_VOLUME - FluidVolume;
+            GasDensity = GasMass / GasVolume;
+        }
+        private void CalculateEnergyInput(double dt)
+        {
+            InputEnergy -= VESSEL_COOLING_COEFF * (HotwellTemp - FluidTemp) * dt;
+            InputEnergy += ROD_HEATING_COEFF * (600 - FluidTemp) * dt;
+            InputEnergy /= 1e6;
+        }
+        public void Step(double dt)
+        {
+            CalculateEnergyInput(dt);
+            FluidVolume += FeedwaterFlow * dt;
+            FluidBoilingPoint = Math.Pow((1/Constants.WATER_BOILING_POINT_NORM - (8.314 * Math.Log(Pressure))/40700), -1);
+
+            FluidTemp += (InputEnergy * 1e6) / (FluidMass * Constants.WATER_HEAT_CAPACITY);
+            if (FluidTemp > FluidBoilingPoint)
+            {
+                InputEnergy = FluidMass * Constants.WATER_HEAT_CAPACITY * FluidTemp - FluidBoilingPoint;
+                FluidTemp = FluidBoilingPoint;
+                double d_vapour = InputEnergy / Constants.WATER_LATENT_HEAT;
+                FluidMass -= d_vapour;
+                GasMass += d_vapour;
+
+                CalculateDensity();
+            }
+
+            Pressure = 1 + ((GasMass/Constants.WATER_MOLAR_MASS) * (Constants.IDEAL_GAS_CONSTANT * FluidTemp / TOTAL_VOLUME - FluidVolume));
+            if (Pressure < 1) {Pressure = 1;}
+
+            GasMass -= (Pressure - 1) * ReliefValvePos * dt;
+            if (GasMass < 0) {GasMass = 0;}
+        }
+    }
+}