Select exit velocity, actual flow rate, or internal diameter for a target velocity, then enter the two displayed quantities for a circular stack.
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Stack Exit Velocity Formula
The following two example problems outline the steps and information needed to calculate the Stack Exit Velocity.
Variables:
- SEV is the Stack Exit Velocity (ft/min)
- VFR is the stack volumetric flow rate (ft^3/min)
- D is the stack diameter (ft)
To calculate the average exit velocity, divide actual volumetric flow at the exit temperature and pressure by the internal circular area. Standard-condition flow requires conversion before use; this geometry calculation does not verify exhaust design or a universal acceptable velocity range.
How to Calculate Stack Exit Velocity?
The following steps outline how to calculate the Stack Exit Velocity.
- First, determine the stack volumetric flow rate (ft^3/min).
- Next, determine the stack diameter (ft).
- Next, gather the formula from above: SEV = VFR / (pi*D^2/4).
- Finally, calculate the Stack Exit Velocity.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
stack volumetric flow rate (ft^3/min) = 300
stack diameter (ft) = 4
SEV = VFR / (pi*D^2/4) = ?
