1. What is Heat Loss Calculation?

Heat loss calculation determines the amount of thermal energy that escapes from a building through various surfaces and air infiltration. It is essential for proper heating system design and energy efficiency analysis in residential and commercial buildings.

2. How Does the Calculator Work?

The calculator uses the heat loss formula:

Where:

• \( U \) — Thermal transmittance coefficient (W/m²K)
• \( A \) — Surface area (m²)
• \( \Delta T \) — Temperature difference between inside and outside (K)
• \( \text{Infiltration} \) — Heat loss due to air leakage (W)

Explanation: The formula calculates conductive heat loss through building elements and adds infiltration losses from air exchange.

3. Importance of Heat Loss Calculation

Details: Accurate heat loss calculation is crucial for sizing heating systems correctly, optimizing energy consumption, ensuring thermal comfort, and meeting building energy efficiency standards.

4. Using the Calculator

Tips: Enter U-value in W/m²K, area in square meters, temperature difference in Kelvin, and infiltration loss in Watts. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical U-value for walls?
A: Modern insulated walls typically have U-values between 0.15-0.35 W/m²K, while older uninsulated walls can be 1.5-2.0 W/m²K.

Q2: How do I calculate infiltration loss?
A: Infiltration loss = Air changes per hour × Volume × Air density × Specific heat capacity × ΔT / 3600

Q3: What temperature difference should I use?
A: Use the difference between desired indoor temperature and design outdoor temperature for your location.

Q4: Why is heat loss calculation important for HVAC?
A: It ensures heating systems are properly sized - neither undersized (inadequate heating) nor oversized (inefficient operation).

Q5: Can this calculator handle multiple surfaces?
A: This is a basic calculator for single surface calculations. For complete building analysis, sum losses from all surfaces separately.