1. What is a Heat Transfer Calculator?

Definition: This calculator estimates the rate of heat transfer through a surface using the heat transfer equation.

Purpose: It helps engineers, architects, and students determine heat flow for thermal analysis of buildings, equipment, and systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Heat transfer rate (Watts)
• \( U \) — Heat transfer coefficient (W/m² K)
• \( A \) — Surface area (m²)
• \( \Delta T \) — Temperature difference across surface (Kelvin)

Explanation: The heat transfer coefficient multiplied by area and temperature difference gives the heat flow rate.

3. Importance of Heat Transfer Calculation

Details: Accurate heat transfer calculations are essential for designing energy-efficient buildings, HVAC systems, and thermal insulation.

4. Using the Calculator

Tips: Enter the U-value, surface area, and temperature difference. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are typical U-values?
A: Single-pane window: ~5.0, Double-glazed window: ~2.8, Brick wall: ~2.0, Well-insulated wall: ~0.35 W/m² K.

Q2: Why use Kelvin for temperature difference?
A: Kelvin and Celsius degrees are the same size, so ΔT is numerically identical in both units.

Q3: Can I use this for cooling calculations?
A: Yes, the same formula applies for heat gain (cooling load) calculations.

Q4: How does surface area affect heat transfer?
A: Heat transfer is directly proportional to surface area - doubling the area doubles the heat flow.

Q5: What if my materials have different U-values?
A: Calculate each component separately or use the overall U-value for composite structures.