You can select a dynamic sizing method for the
ductwork for the duct systems in a project using the Duct Sizing
dialog. You can specify sizing for sections of duct using friction
and/or velocity, equal friction, or static regain sizing methods.
Sizing can be applied to sections of ductwork or to an entire system.
use the Duct Sizing dialog to specify duct size, the ductwork must
be connected to a duct system with a valid air flow.
- Select a section of ductwork in a view,
and click Modify | Ducts tabAnalysis panel Duct/PipeSizing.
Select a Sizing Method
- In the Duct Sizing dialog, select a sizing
method from the drop list: Velocity, Friction, Equal Friction, or
When you select Friction
or Velocity, the following are activated:
- Only to size
ducts according to the parameters for the selected method (Velocity
or Friction) exclusively.
- And to force
sizing ducts to meet the parameters that you specify for both Velocity
- Or to allow
sizing ducts according to the least restrictive of either the Friction
or Velocity parameters.
- Select a sizing method, and specify the
parameter(s) for the selected sizing method(s).
Specify Branch Sizing Constraints
You can constrain the
size of duct segments by selecting an option from the Constraints
list, and specifying an absolute limit on the size of ducts using the
Restrict Size option.
Select one of the following Constraints
from the drop list:
- Calculated Size Only - The size of the
selected duct segment(s) is determined by the selected sizing method
and is not otherwise constrained.
- Match Connector Size - The size of the
selected duct segment(s) in the branch is determined by the size
of the connector used to between the branch and the main, up until
the first junction in the network.
- Larger of Connector and Calculated -
The size of the selected duct segment(s) is determined by the larger
of 2 determinants. If the connector size is smaller than the size
calculated by sizing the sizing method, then the calculated size
will be used. If the connector size is larger than the size calculated
by sizing the sizing method, then the connector size will be used.
- If necessary, click Restrict Height/Restrict
Width and enter a value to specify an absolute limit to the size
of the selected duct segment(s).