1. What is a Heat Exchanger Surface Area Calculator?

Definition: This calculator determines the required heat transfer surface area based on heat transfer rate, overall coefficient, and temperature difference.

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

2. How Does the Calculator Work?

The calculator uses the fundamental heat exchanger equation:

Where:

• \( A \) — Heat transfer surface area (m²)
• \( Q \) — Heat transfer rate (W)
• \( U \) — Overall heat transfer coefficient (W/m² K)
• \( LMTD \) — Log Mean Temperature Difference (K)

Explanation: The heat transfer rate is divided by the product of the overall heat transfer coefficient and the temperature driving force (LMTD).

3. Importance of Surface Area Calculation

Details: Proper surface area calculation ensures efficient heat transfer, optimal equipment sizing, and cost-effective heat exchanger design.

4. Using the Calculator

Tips: Enter the heat transfer rate 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 heat exchangers?
A: U values vary widely (50-2000 W/m² K) depending on fluids and exchanger type. Water-to-water is ~800-1500, air-to-air ~10-100.

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 affects the overall heat transfer coefficient?
A: Fluid properties, flow rates, fouling factors, and heat exchanger design all influence U.

Q4: Does this work for all heat exchanger types?
A: The basic equation works for all types, but correction factors are needed for non-counterflow configurations.

Q5: Should I include a safety factor?
A: Yes, typically add 10-20% to the calculated area for fouling and design uncertainties.