Duct Design Data
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Defines the duct data settings used for sizing duct.
- Material
Type — Sets the material type for the duct.
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Roughness — Sets the roughness of the
duct material.
The unit assigned is inch for Imperial and mm
for Metric.
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Flow Rate — Sets the value for rate of
flow and unit of flow.
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Flow Rate Units — The Imperial unit can
be selected as ft3/min or fl3/sec, and the Metric unit m3/s, m3/hr or l/s
respectively.
Tip: You can set default flow rate units using the
BMECH_FLOWRATE_UNIT configuration
variable.
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Velocity — Sets the velocity with which the flow travels in the
ducts.
The unit assigned per currently set under Unit
System – ft/min for Imperial and m/s for Metric.
-
Pressure Drop — Sets the pressure drop
value along the duct flow.
The unit assigned per currently set under Unit
System – H2O/100ft for Imperial and pa/m for Metric.
- Air
Temperature — Sets the temperature of air in flow system.
The unit assigned is ºF for Imperial and ºC for
Metric.
-
Atms Pressure — Sets the value for
atmospheric pressure to effect compute realistic duct performance.
The unit assigned per currently set under Unit
System – psi for Imperial and mbar for Metric.
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General
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- Unit
System — Displays the units being used in duct sizing computing.
When toggled applies one of the unit system.
- Imperial —
Displays and apply imperial measurement units.
- Metric —
Displays and apply metric measurement units.
- Equivalent Diameter
Equation — Defines a standard to compute the duct sizing equating
the equation from two given standards.
- CIBSE — When
on, applies the CIBSE standards equation in computing the duct sizings.
- ASHRAE — When
on, applies the ASHRAE standards equation in computing the duct sizings.
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Fixed Dimensions
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Sets fixed values that define dimension of the
duct.
- Use Fixed Value —
When on, enables dimension fields for selected shape option. For rectangular
ducts, the dimensions override the Rectangular Criteria set.
Note: The units in the bracket reflect the units
assigned to the dimensions as per selected unit system; inch for Imperial and
mm for Metric.
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Rectangular/Oval Output Options
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Defines the duct data settings used for sizing
rectangular duct.
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Shape Option
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- Shape — Defines
one of the shapes to ducts, among three standard shapes.
- Circular — When
on, assigns round shape to duct being sized.
- Rectangular —
When on, assigns rectangular shape to duct being sized.
- Oval — When on,
assigns oval shape to duct being sized.
- Dimensions —
Sets fixed values that define dimension of the duct.
- Fixed —
Populates dimension fields for selected shape option.
For Round ducts:
- Diameter —
Appears when Circular Shape option is selected. Sets diameter for the round
duct.
For Rectangular and Flat Oval ducts:
- Width —
Appears when Rectangular or Oval Shape option is selected. Sets width dimension
for the rectangular / oval duct.
- Depth —
Appears when Rectangular or Oval Shape option is selected. Sets depth dimension
for the rectangular / oval duct. The aspect ratio in the result is the width to
depth ratio of a rectangular / oval duct.
- Calculated —
Assigns calculated duct dimension values. Effect upon Calculate.
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Calculate
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Computes the duct size according to the parameters
set.
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