Heat Loss Formula:
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Definition: This calculator determines the total heat loss (Q) of a building by summing fabric loss, ventilation loss, and infiltration loss.
Purpose: It helps architects, engineers, and energy assessors calculate heat loss for building compliance and energy efficiency assessments.
The calculator uses the formula:
Where:
Explanation: The three components of heat loss are simply summed to give the total heat loss figure required for MCS calculations.
Details: Accurate heat loss calculations are essential for proper heating system sizing, energy performance certification, and compliance with building regulations.
Tips: Enter each component of heat loss in Watts. All values must be ≥ 0. Use separate tools to calculate each component if needed.
Q1: What's the difference between ventilation and infiltration?
A: Ventilation is intentional air exchange (through vents/windows), while infiltration is uncontrolled air leakage.
Q2: How do I calculate fabric loss?
A: Fabric loss is calculated as the sum of (U-value × area × temperature difference) for all building elements.
Q3: What's a typical ratio between these components?
A: In modern buildings, fabric loss is typically 40-60%, ventilation 30-50%, and infiltration 10-20% of total heat loss.
Q4: Why is this important for MCS?
A: MCS (Microgeneration Certification Scheme) requires accurate heat loss calculations for heat pump and renewable heating system installations.
Q5: Does this include thermal bridging?
A: No, thermal bridging effects should be included in your fabric loss calculations before using this tool.