1. What is Heat Loss Calculation?

Definition: This calculator estimates the heat loss of a building through its envelope using the U-value method.

Purpose: It helps architects, engineers, and homeowners determine heating requirements and improve energy efficiency.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Heat loss (Watts)
• \( U \) — U-value (Thermal transmittance in W/m²K)
• \( A \) — Surface area (m²)
• \( \Delta T \) — Temperature difference (Kelvin)

Explanation: The U-value represents how well a material conducts heat, multiplied by the area and temperature difference to calculate total heat loss.

3. Importance of Heat Loss Calculation

Details: Proper heat loss estimation ensures adequate heating system sizing, energy efficiency, and building code compliance.

4. Using the Calculator

Tips: Enter the U-value (lower is better insulation), surface area, and temperature difference between inside and outside. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical U-value for walls?
A: Modern insulated walls: 0.2-0.3 W/m²K, older walls: 1.0-1.5 W/m²K.

Q2: How do I find the temperature difference?
A: Subtract outside temperature from desired inside temperature (e.g., 20°C inside and -5°C outside = 25K difference).

Q3: Should I calculate for each building element separately?
A: Yes, for accuracy calculate walls, windows, roof, and floors separately then sum the results.

Q4: What about air infiltration losses?
A: This calculator doesn't include air leakage - add 10-20% to total heat loss for typical houses.

Q5: How can I reduce heat loss?
A: Improve insulation (lower U-values), reduce air leaks, and install energy-efficient windows.