Update calculation.py

calculation.py

@@ -3,7 +3,7 @@ import numpy as np
 import math
 
 class SteamPipe:
-    def __init__(self, steam_flow, inlet_pressure, superheat, steam_temp, line_size, ambient_temp, ambient_velocity, insulation_material, cladding_material, insulation_data, cladding_data, steam_properties, user_insulation_thickness=None):
+    def __init__(self, steam_flow, inlet_pressure, superheat, steam_temp, line_size, ambient_temp, ambient_velocity, insulation_material, cladding_material, user_insulation_thickness=None):
         self.steam_flow = steam_flow  # kg/hr
         self.inlet_pressure = inlet_pressure  # kg/cm²g
         self.superheat = superheat  # °C
@@ -13,11 +13,12 @@ class SteamPipe:
         self.ambient_velocity = ambient_velocity  # m/s
         self.insulation_material = insulation_material
         self.cladding_material = cladding_material
-        
-        self.insulation_data = insulation_data
-        self.cladding_data = cladding_data
-        self.steam_properties = steam_properties
         self.user_insulation_thickness = user_insulation_thickness  # User-defined insulation thickness
+        
+        # Load data from CSV files
+        self.insulation_data = pd.read_csv("insulation_data.csv")
+        self.cladding_data = pd.read_csv("cladding_data.csv")
+        self.steam_properties = pd.read_csv("steam_properties.csv")
     
     def get_nearest_upper_value(self, df, column, value):
         """Gets the nearest upper value from a given dataframe column."""
@@ -26,16 +27,24 @@ class SteamPipe:
     
     def get_steam_property(self):
         """Fetches steam property (enthalpy, specific heat, etc.) based on pressure."""
-        pressure = self.get_nearest_upper_value(self.steam_properties, 'Pressure', self.inlet_pressure)
-        row = self.steam_properties[self.steam_properties['Pressure'] == pressure]
+        pressure = self.get_nearest_upper_value(self.steam_properties, 'Pressure (Kg/cm²g)', self.inlet_pressure)
+        row = self.steam_properties[self.steam_properties['Pressure (Kg/cm²g)'] == pressure]
         if not row.empty:
             return row.iloc[0]
         else:
             raise ValueError("Steam property not found for given pressure")
 
+    def get_cladding_emissivity(self):
+        """Fetches emissivity of selected cladding material."""
+        row = self.cladding_data[self.cladding_data['Material'] == self.cladding_material]
+        if not row.empty:
+            return row['Emissivity'].values[0]
+        else:
+            raise ValueError("Cladding material not found")
+    
     def calculate_heat_loss(self, insulation_thickness):
         """Calculates heat loss per unit length using Fourier’s Law for cylindrical surfaces."""
-        k_insulation = self.get_nearest_upper_value(self.insulation_data, 'Thermal Conductivity', 0)
+        k_insulation = self.get_nearest_upper_value(self.insulation_data[self.insulation_data['Material'] == self.insulation_material], 'Thermal_Conductivity (W/mK)', 0)
         
         r_inner = self.line_size / 2  # Inner radius (m)
         r_outer = r_inner + insulation_thickness  # Outer radius (m)
@@ -54,7 +63,7 @@ class SteamPipe:
     def calculate_outlet_temperature(self, heat_loss):
         """Estimates outlet temperature based on heat loss."""
         steam_property = self.get_steam_property()
-        specific_heat = steam_property['Specific Heat']  # J/kgK
+        specific_heat = steam_property['Specific Heat (Cp) (kJ/kg·K)']  # kJ/kgK
         mass_flow_rate = self.steam_flow / 3600  # Convert kg/hr to kg/s
         delta_T = heat_loss / (mass_flow_rate * specific_heat)
         return max(self.steam_temp - delta_T, self.ambient_temp)
@@ -69,5 +78,3 @@ class SteamPipe:
         
         return outlet_temp, insulation_thickness, heat_loss
 
-
-