1. What is a Plate Heat Exchanger Sizing Calculator?

Definition: This calculator estimates the required heat transfer area for a plate heat exchanger based on heat duty, overall heat transfer coefficient, and log mean temperature difference.

Purpose: It helps engineers and technicians properly size plate heat exchangers for various thermal applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The heat duty is divided by the product of the overall coefficient and temperature difference to determine the required surface area.

3. Importance of Proper Heat Exchanger Sizing

Details: Correct sizing ensures efficient heat transfer, proper equipment selection, and optimal energy usage in thermal systems.

4. Using the Calculator

Tips: Enter the heat duty in watts, overall coefficient (default 3000 W/m²K for water-water systems), and LMTD (default 20K). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical U value for plate heat exchangers?
A: For water-water systems, 3000-7000 W/m²K; for other fluids, consult engineering references.

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 safety factors should I consider?
A: Typically add 10-20% to the calculated area for fouling and future capacity needs.

Q4: How does plate count relate to area?
A: Each plate provides a certain area - total area divided by plate area gives approximate plate count.

Q5: Can I use this for other heat exchanger types?
A: The formula applies generally, but U values differ significantly for shell-and-tube or other designs.