Q (L/s) = kW ÷ (0.0012 × ΔT) where 0.0012 = ρ·Cp for air
Results
Room area
—
m²
Room volume
—
m³
Load factor
—
kW/m²
Sensible load
—
kW
Required airflow
—
L/s
Airflow per m²
—
L/s·m²
Enter room dimensions above to calculate.
HTU unit selection
Units selected
—
units
Total capacity
—
L/s
Headroom
—
L/s surplus
Utilisation
—
% of capacity
Capacity utilisation
0 L/s required0 L/s capacity
Calculate room load above, then select number of units.
Plan view — HTU unit placement
Leave blank to use room length
Leave blank to use room width
Based on Australian HVAC rules of thumb. Load factors and ΔT values are editable above. Airflow formula: Q (L/s) = kW ÷ (0.0012 × ΔT), where 0.0012 kJ/(L·°C) represents the volumetric heat capacity of air at standard conditions. HTU capacity is editable — enter your unit's rated airflow. Plan view places units in a symmetrical grid; always verify placement against room obstructions. For detailed design, consult AS 1668 and a qualified mechanical engineer.
