1. What is a Heat Transfer Area Calculator?

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

Purpose: It helps engineers and technicians design heat exchangers and evaluate thermal systems.

2. How Does the Calculator Work?

The calculator uses the fundamental heat transfer equation:

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 load is divided by the product of heat transfer coefficient and temperature difference to determine required surface area.

3. Importance of Heat Transfer Area Calculation

Details: Accurate area calculation ensures proper heat exchanger sizing, energy efficiency, and system performance.

4. Using the Calculator

Tips: Enter the heat transfer rate in watts, overall coefficient (default 500 W/m²K), and LMTD (default 10 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.

Q2: Typical U values for common applications?
A: Water-to-water: 800-1500, Air-to-water: 10-50, Steam-to-water: 1000-6000 W/m²K.

Q3: How do I find the 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: Does this work for all heat exchanger types?
A: Primarily for shell-and-tube and plate heat exchangers. Special considerations needed for others.

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