Create app.py

app.py

@@ -0,0 +1,67 @@
+import streamlit as st
+import math
+
+def design_heat_exchanger(duty, t_hot_in, t_hot_out, t_cold_in, t_cold_out, overall_heat_transfer_coeff, fouling_factor):
+    """
+    Calculate heat transfer area and LMTD for shell-and-tube heat exchanger.
+    
+    Parameters:
+    - duty: Heat duty (kW)
+    - t_hot_in: Hot fluid inlet temperature (°C)
+    - t_hot_out: Hot fluid outlet temperature (°C)
+    - t_cold_in: Cold fluid inlet temperature (°C)
+    - t_cold_out: Cold fluid outlet temperature (°C)
+    - overall_heat_transfer_coeff: Overall heat transfer coefficient (W/m²°C)
+    - fouling_factor: Fouling resistance (m²°C/W)
+    
+    Returns:
+    - Heat transfer area (m²)
+    - Log Mean Temperature Difference (°C)
+    """
+    try:
+        # Convert duty from kW to W
+        duty_w = duty * 1000
+
+        # Calculate Log Mean Temperature Difference (LMTD)
+        delta_t1 = t_hot_in - t_cold_out
+        delta_t2 = t_hot_out - t_cold_in
+        
+        if delta_t1 <= 0 or delta_t2 <= 0:
+            return "Invalid temperature inputs!", "N/A"
+        
+        lmtd = (delta_t1 - delta_t2) / math.log(delta_t1 / delta_t2)
+        
+        # Calculate heat transfer area
+        effective_u = overall_heat_transfer_coeff * (1 - fouling_factor)
+        if effective_u <= 0:
+            return "Invalid fouling factor or heat transfer coefficient!", "N/A"
+        
+        area = duty_w / (effective_u * lmtd)
+        return round(area, 2), round(lmtd, 2)
+    
+    except Exception as e:
+        return str(e), "N/A"
+
+# Streamlit App
+st.title("Shell-and-Tube Heat Exchanger Design")
+st.write("Enter the design parameters to calculate the heat transfer area and LMTD.")
+
+# Input fields
+duty = st.number_input("Heat Duty (kW)", min_value=0.1, step=0.1)
+t_hot_in = st.number_input("Hot Fluid Inlet Temperature (°C)", step=0.1)
+t_hot_out = st.number_input("Hot Fluid Outlet Temperature (°C)", step=0.1)
+t_cold_in = st.number_input("Cold Fluid Inlet Temperature (°C)", step=0.1)
+t_cold_out = st.number_input("Cold Fluid Outlet Temperature (°C)", step=0.1)
+overall_heat_transfer_coeff = st.number_input("Overall Heat Transfer Coefficient (W/m²°C)", min_value=1.0, step=0.1)
+fouling_factor = st.number_input("Fouling Factor (m²°C/W)", min_value=0.0, max_value=1.0, step=0.01)
+
+# Perform calculation on button click
+if st.button("Calculate"):
+    area, lmtd = design_heat_exchanger(
+        duty, t_hot_in, t_hot_out, t_cold_in, t_cold_out, 
+        overall_heat_transfer_coeff, fouling_factor
+    )
+    
+    st.write("### Results")
+    st.write(f"**Heat Transfer Area:** {area} m²")
+    st.write(f"**Log Mean Temperature Difference:** {lmtd} °C")