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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")
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