1. What is a Heat Engineer Heat Loss Calculator?

Definition: This calculator estimates the total heat loss of a building by combining fabric loss and ventilation loss components.

Purpose: It helps heating engineers and energy assessors determine the heat loss characteristics of buildings for proper heating system sizing.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Total heat loss (Watts)
• \( Fabric\ Loss \) — Heat loss through building fabric (W)
• \( Ventilation\ Loss \) — Heat loss through air changes (W)

Explanation: The two main components of heat loss are added together to determine the total heat loss of the building.

3. Importance of Heat Loss Calculation

Details: Accurate heat loss calculations ensure properly sized heating systems, energy efficiency, and occupant comfort.

4. Using the Calculator

Tips: Enter the fabric loss and ventilation loss values in Watts. Both values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine fabric loss?
A: Fabric loss is calculated by summing (U-value × area × temperature difference) for all building elements.

Q2: How is ventilation loss calculated?
A: Ventilation loss = 0.33 × air changes per hour × volume × temperature difference.

Q3: What's a typical heat loss for a house?
A: Modern homes might be 50-100 W/m², while older homes could be 100-200 W/m².

Q4: Why measure heat loss in Watts?
A: Watts are the standard unit for heat transfer rate, allowing direct sizing of heating systems.

Q5: Does this include thermal bridging?
A: No, thermal bridging should be accounted for separately in the fabric loss calculation.