Create app.py

app.py

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+import gradio as gr
+import numpy as np
+
+# Function to calculate heat exchanger parameters
+def design_heat_exchanger(shell_fluid, tube_fluid, flow_rate_shell, inlet_temp_shell, inlet_temp_tube, outlet_temp_shell):
+    # Constants (properties from the book, approximated for common fluids like water)
+    fluid_properties = {
+        "Water": {"cp": 4186, "density": 997},
+        "Oil": {"cp": 2000, "density": 900},
+        "Air": {"cp": 1005, "density": 1.2},
+    }
+
+    # Assumptions
+    U = 500  # Overall heat transfer coefficient (W/m^2.K)
+    tube_outer_diameter = 0.025  # 25 mm (outer diameter)
+    tube_inner_diameter = 0.022  # 22 mm (inner diameter)
+    tube_length = 4.0  # 4 meters (standard length)
+
+    # Extract properties
+    cp_shell = fluid_properties[shell_fluid]["cp"]
+    cp_tube = fluid_properties[tube_fluid]["cp"]
+
+    # Heat duty
+    heat_duty = flow_rate_shell * cp_shell * (outlet_temp_shell - inlet_temp_shell)
+
+    # Estimate outlet temperature of tube-side fluid
+    flow_rate_tube = heat_duty / (cp_tube * (inlet_temp_tube - outlet_temp_shell))
+    outlet_temp_tube = inlet_temp_tube + (heat_duty / (flow_rate_tube * cp_tube))
+
+    # Log Mean Temperature Difference (LMTD)
+    delta_t1 = outlet_temp_shell - inlet_temp_tube
+    delta_t2 = inlet_temp_shell - outlet_temp_tube
+    LMTD = (delta_t1 - delta_t2) / np.log(delta_t1 / delta_t2)
+
+    # Required heat transfer area
+    area = heat_duty / (U * LMTD)
+
+    # Number of tubes
+    tube_cross_sectional_area = np.pi * (tube_outer_diameter / 2) ** 2
+    number_of_tubes = np.ceil(area / (tube_length * tube_cross_sectional_area))
+
+    # Shell diameter (based on tube layout factor)
+    shell_diameter = np.sqrt(number_of_tubes) * tube_outer_diameter * 1.25  # Approximation for tube bundle arrangement
+
+    # Results
+    results = {
+        "Heat Duty (kW)": heat_duty / 1000,
+        "Outlet Temp (Tube Side) [°C]": outlet_temp_tube,
+        "Log Mean Temp Diff (°C)": LMTD,
+        "Heat Transfer Area (m²)": area,
+        "Number of Tubes": int(number_of_tubes),
+        "Shell Diameter (m)": shell_diameter,
+    }
+    return results
+
+
+# Gradio Interface
+def heat_exchanger_interface(shell_fluid, tube_fluid, flow_rate_shell, inlet_temp_shell, inlet_temp_tube, outlet_temp_shell):
+    results = design_heat_exchanger(shell_fluid, tube_fluid, flow_rate_shell, inlet_temp_shell, inlet_temp_tube, outlet_temp_shell)
+    return results
+
+
+# Define inputs and outputs for the Gradio app
+inputs = [
+    gr.Dropdown(["Water", "Oil", "Air"], label="Shell Side Fluid"),
+    gr.Dropdown(["Water", "Oil", "Air"], label="Tube Side Fluid"),
+    gr.Number(label="Flow Rate (Shell Side) [kg/s]", value=1.0),
+    gr.Number(label="Inlet Temperature (Shell Side) [°C]", value=50.0),
+    gr.Number(label="Inlet Temperature (Tube Side) [°C]", value=20.0),
+    gr.Number(label="Outlet Temperature (Shell Side) [°C]", value=70.0),
+]
+
+outputs = gr.JSON(label="Heat Exchanger Design Results")
+
+# Launch the Gradio app
+gr.Interface(fn=heat_exchanger_interface, inputs=inputs, outputs=outputs, title="Shell and Tube Heat Exchanger Design").launch()