1. What is a Heat Exchanger Area Calculator?

Definition: This calculator determines the required heat transfer surface area based on thermal performance parameters.

Purpose: It helps engineers and technicians design and evaluate heat exchanger systems for various applications.

2. How Does the Calculator Work?

The calculator uses the fundamental heat exchanger equation:

Where:

• \( A \) — Heat transfer 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 log mean temperature difference.

3. Importance of Heat Exchanger Area Calculation

Details: Accurate area calculation ensures proper heat transfer performance, energy efficiency, and correct sizing of equipment.

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 LMTD?
A: Log Mean Temperature Difference is the driving force for heat transfer in heat exchangers, accounting for temperature variations.

Q2: Typical U values for different exchangers?
A: Water-to-water: 800-1500, Steam-to-water: 1500-4000, Gas-to-gas: 10-300 W/m² K.

Q3: How to find heat transfer rate (Q)?
A: Q = m × Cp × ΔT, where m is mass flow rate, Cp is specific heat, and ΔT is temperature change.

Q4: When is this formula not applicable?
A: For phase-change heat exchangers or when temperature profiles are highly nonlinear.

Q5: Should I add a safety factor?
A: Yes, typical design includes 10-20% additional area for fouling and uncertainties.