Shell and Tube Heat Exchanger Sizing Calculator

Heat Transfer Area Formula:

\[ A = \frac{Q}{U \times LMTD} \]

Heat Transfer Area (A): m²

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1. What is a Shell and Tube Heat Exchanger Sizing Calculator?

Definition: This calculator estimates the required heat transfer area for a shell and tube heat exchanger based on thermal parameters.

Purpose: It helps engineers and designers determine the appropriate size for heat exchangers in industrial applications.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ A = \frac{Q}{U \times LMTD} \]

Where:

\( A \) — Heat transfer area (square meters)
\( Q \) — Heat duty (Watts)
\( U \) — Overall heat transfer coefficient (W/m² K)
\( LMTD \) — Log mean temperature difference (Kelvin)

Explanation: The heat duty is divided by the product of the overall heat transfer coefficient and the log mean temperature difference.

3. Importance of Heat Exchanger Sizing

Details: Proper sizing ensures efficient heat transfer, meets process requirements, and avoids overdesign that increases costs.

4. Using the Calculator

Tips: Enter the heat duty in Watts, overall heat transfer coefficient (default 500 W/m² K), and LMTD (default 20 K). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical U value for shell and tube exchangers?
A: Typical values range from 300-1500 W/m² K depending on fluids and flow conditions.

Q2: How do I calculate LMTD?
A: Use our LMTD Calculator tool or the formula: [(ΔT1 - ΔT2)/ln(ΔT1/ΔT2)] for counter-current flow.

Q3: What factors affect the U value?
A: Fluid properties, flow rates, fouling factors, and exchanger geometry all influence U.

Q4: Does this include safety factors?
A: No, consider adding 10-20% to the calculated area for fouling and design margins.

Q5: How do I convert heat duty from other units?
A: 1 kW = 1000 W, 1 BTU/hr = 0.293 W, 1 kcal/hr = 1.163 W.