1. What is a Brazed Plate Heat Exchanger Sizing Calculator?

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

Purpose: It helps engineers and technicians properly size brazed 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/m² K)
• \( LMTD \) — Log mean temperature difference (K)

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

3. Importance of Proper Heat Exchanger Sizing

Details: Correct sizing ensures efficient heat transfer, proper system performance, and avoids oversizing which increases costs or undersizing which reduces effectiveness.

4. Using the Calculator

Tips: Enter the heat duty in watts, overall coefficient (default 3000 W/m² K for water-water systems), and LMTD (default 10 K). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical U value for brazed plate exchangers?
A: For water-water systems, 3000-6000 W/m² K is typical. For other fluids, consult manufacturer data.

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

Q4: Should I include a safety factor?
A: Yes, typical design includes 10-20% additional area for fouling and future capacity needs.

Q5: How does this differ for other heat exchanger types?
A: The basic formula is similar, but U values and design considerations vary significantly by exchanger type.