Air Infiltration Load (\( Q_{ai} = \frac{Vr \cdot Hf \cdot AC}{86400} \)):

Where:

• \( Q_{ai} \) is the air infiltration loss, in watts (W).
• \( Vr \) is the room volume, in cubic meters (m³).
• \( Hf \) is the heat factor, in joules (J).
• \( AC \) is the air changes, in kilojoules per cubic meter (KJ/m³).