Create app.py

app.py

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+import streamlit as st
+import numpy as np
+import pandas as pd
+
+# App title
+st.title("Shell and Tube Heat Exchanger Design")
+
+# Sidebar for user inputs
+st.sidebar.header("Input Parameters")
+
+# Input parameters
+fluid_1 = st.sidebar.selectbox("Fluid on Shell Side", ["Water", "Oil", "Air"])
+fluid_2 = st.sidebar.selectbox("Fluid on Tube Side", ["Water", "Oil", "Air"])
+flow_rate_1 = st.sidebar.number_input("Flow Rate (Shell Side) [kg/s]", min_value=0.1, value=1.0, step=0.1)
+flow_rate_2 = st.sidebar.number_input("Flow Rate (Tube Side) [kg/s]", min_value=0.1, value=1.0, step=0.1)
+inlet_temp_1 = st.sidebar.number_input("Inlet Temperature (Shell Side) [°C]", min_value=-50.0, value=50.0, step=1.0)
+inlet_temp_2 = st.sidebar.number_input("Inlet Temperature (Tube Side) [°C]", min_value=-50.0, value=20.0, step=1.0)
+desired_outlet_temp_1 = st.sidebar.number_input("Desired Outlet Temperature (Shell Side) [°C]", min_value=-50.0, value=70.0, step=1.0)
+
+# Thermal properties
+fluid_properties = {
+    "Water": {"cp": 4186, "density": 997},
+    "Oil": {"cp": 2000, "density": 900},
+    "Air": {"cp": 1005, "density": 1.2},
+}
+
+cp_1 = fluid_properties[fluid_1]["cp"]
+cp_2 = fluid_properties[fluid_2]["cp"]
+
+# Calculations
+heat_duty = flow_rate_1 * cp_1 * (desired_outlet_temp_1 - inlet_temp_1)  # Heat duty in Watts
+outlet_temp_2 = inlet_temp_2 + (heat_duty / (flow_rate_2 * cp_2))  # Estimate outlet temperature for tube side
+
+# Display results
+st.header("Design Results")
+st.write(f"**Heat Duty:** {heat_duty / 1000:.2f} kW")
+st.write(f"**Estimated Outlet Temperature (Tube Side):** {outlet_temp_2:.2f} °C")
+
+# Preliminary sizing
+U = 500  # Overall heat transfer coefficient (W/m^2.K), assumed
+LMTD = ((desired_outlet_temp_1 - inlet_temp_2) - (inlet_temp_1 - outlet_temp_2)) / np.log(
+    (desired_outlet_temp_1 - inlet_temp_2) / (inlet_temp_1 - outlet_temp_2)
+)
+area = heat_duty / (U * LMTD)  # Heat transfer area (m^2)
+
+st.write(f"**Log Mean Temperature Difference (LMTD):** {LMTD:.2f} °C")
+st.write(f"**Required Heat Transfer Area:** {area:.2f} m²")
+
+# Additional features
+st.header("Additional Options")
+if st.checkbox("View Example Tube and Shell Details"):
+    st.write("**Example Tube Details:**")
+    st.write("- Material: Copper")
+    st.write("- Inner Diameter: 15 mm")
+    st.write("- Outer Diameter: 18 mm")
+    st.write("- Length: 2.0 m")
+    st.write("")
+    st.write("**Example Shell Details:**")
+    st.write("- Material: Carbon Steel")
+    st.write("- Diameter: 0.5 m")
+    st.write("- Length: 2.0 m")
+    st.write("- Number of Tubes: 50")
+
+# Footer
+st.sidebar.write("Developed by a Chemical Engineering Enthusiast")