Stack Effect Calculator

Stack Effect Equation

$$ Q = C \sqrt{H \Delta T} $$ where:

Q = Airflow Rate (m³/s)

C = Discharge Coefficient (Dimensionless)

H = Height of the building or the vertical distance between openings (m)

Δ T = Temperature difference between the indoor and outdoor air (K)

Calculator

Property to Calculate:

Airflow Rate (Q):

Discharge Coefficient (C):

Height (H):

Temperature difference (Δ T):

Equation Assumptions

The system is in steady-state.
Temperature indoors is uniform.
Temperature outdoors is constant.
Fluid is incompressible.
Fluid behaves as an ideal gass.