1. What is a Heat Loss Calculator?

Definition: This calculator estimates the heat loss through a building element based on its U-value, surface area, and temperature difference.

Purpose: It helps architects, engineers, and homeowners determine how much heat is lost through walls, windows, roofs, etc.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Heat loss (Watts)
• \( U \) — U-value (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 get total heat loss.

3. Importance of Heat Loss Calculation

Details: Proper heat loss estimation helps in designing energy-efficient buildings, sizing heating systems, and reducing energy costs.

4. Using the Calculator

Tips: Enter the U-value (thermal transmittance), surface area in square meters, and temperature difference in Kelvin. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical U-value for walls?
A: Modern insulated walls typically have U-values between 0.1-0.3 W/m²K, while older walls might be 1.0-2.0 W/m²K.

Q2: How do I find the temperature difference?
A: Subtract the outside temperature from the inside temperature (both in °C or K - the difference is the same in both scales).

Q3: What's a good heat loss value?
A: Lower is better for energy efficiency. The acceptable value depends on climate, building size, and insulation standards.

Q4: Can I use this for windows?
A: Yes, just use the window's U-value (typically higher than walls) and its area.

Q5: Does this include air infiltration losses?
A: No, this only calculates conductive heat loss through building elements. Air leakage requires additional calculations.