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

Definition: This calculator determines the required heat transfer area for a shell and tube heat exchanger based on the heat transfer rate, overall heat transfer coefficient, and log mean temperature difference.

Purpose: It helps engineers and designers properly size heat exchangers for various industrial applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( A \) — Heat transfer area (m²)
• \( Q \) — Heat transfer rate (W)
• \( U \) — Overall heat transfer coefficient (W/m²K)
• \( LMTD \) — Log mean temperature difference (K)

Explanation: The heat transfer rate is divided by the product of the overall heat transfer coefficient and LMTD to determine the required heat transfer surface area.

3. Importance of Heat Exchanger Sizing

Details: Proper sizing ensures efficient heat transfer, optimal energy usage, and cost-effective design while meeting process requirements.

4. Using the Calculator

Tips: Enter the heat transfer rate in watts, overall heat transfer coefficient (default 500 W/m²K), 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 heat exchangers?
A: Typical values range from 250-1000 W/m²K depending on fluids and flow conditions.

Q2: How do I calculate LMTD?
A: LMTD = [(ΔT1 - ΔT2)/ln(ΔT1/ΔT2)] where ΔT1 and ΔT2 are temperature differences at each end.

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

Q4: Should I include a safety factor?
A: Yes, engineers typically add 10-20% to the calculated area for design margin.

Q5: Can this be used for other heat exchanger types?
A: The basic formula applies to all types, but U values and correction factors differ.