sheikhzain185/Computer_Aided_Design

1import streamlit as st2import math3 4def design_heat_exchanger(duty, t_hot_in, t_hot_out, t_cold_in, t_cold_out, overall_heat_transfer_coeff, fouling_factor):5    """6    Calculate heat transfer area and LMTD for shell-and-tube heat exchanger.7    8    Parameters:9    - duty: Heat duty (kW)10    - t_hot_in: Hot fluid inlet temperature (°C)11    - t_hot_out: Hot fluid outlet temperature (°C)12    - t_cold_in: Cold fluid inlet temperature (°C)13    - t_cold_out: Cold fluid outlet temperature (°C)14    - overall_heat_transfer_coeff: Overall heat transfer coefficient (W/m²°C)15    - fouling_factor: Fouling resistance (m²°C/W)16    17    Returns:18    - Heat transfer area (m²)19    - Log Mean Temperature Difference (°C)20    """21    try:22        # Convert duty from kW to W23        duty_w = duty * 100024 25        # Calculate Log Mean Temperature Difference (LMTD)26        delta_t1 = t_hot_in - t_cold_out27        delta_t2 = t_hot_out - t_cold_in28        29        if delta_t1 <= 0 or delta_t2 <= 0:30            return "Invalid temperature inputs!", "N/A"31        32        lmtd = (delta_t1 - delta_t2) / math.log(delta_t1 / delta_t2)33        34        # Calculate heat transfer area35        effective_u = overall_heat_transfer_coeff * (1 - fouling_factor)36        if effective_u <= 0:37            return "Invalid fouling factor or heat transfer coefficient!", "N/A"38        39        area = duty_w / (effective_u * lmtd)40        return round(area, 2), round(lmtd, 2)41    42    except Exception as e:43        return str(e), "N/A"44 45# Streamlit App46st.title("Shell-and-Tube Heat Exchanger Design")47st.write("Enter the design parameters to calculate the heat transfer area and LMTD.")48 49# Input fields50duty = st.number_input("Heat Duty (kW)", min_value=0.1, step=0.1)51t_hot_in = st.number_input("Hot Fluid Inlet Temperature (°C)", step=0.1)52t_hot_out = st.number_input("Hot Fluid Outlet Temperature (°C)", step=0.1)53t_cold_in = st.number_input("Cold Fluid Inlet Temperature (°C)", step=0.1)54t_cold_out = st.number_input("Cold Fluid Outlet Temperature (°C)", step=0.1)55overall_heat_transfer_coeff = st.number_input("Overall Heat Transfer Coefficient (W/m²°C)", min_value=1.0, step=0.1)56fouling_factor = st.number_input("Fouling Factor (m²°C/W)", min_value=0.0, max_value=1.0, step=0.01)57 58# Perform calculation on button click59if st.button("Calculate"):60    area, lmtd = design_heat_exchanger(61        duty, t_hot_in, t_hot_out, t_cold_in, t_cold_out, 62        overall_heat_transfer_coeff, fouling_factor63    )64    65    st.write("### Results")66    st.write(f"**Heat Transfer Area:** {area} m²")67    st.write(f"**Log Mean Temperature Difference:** {lmtd} °C")68