Calculations
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19-02-2003 17:42
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Step 6. Pressure loss analysis.
Calculation of flow capacity, velocity and pressure drop is performed dynamically,
enabling the easy control of these parameters at given elements of the installation
during the design process.
Pressure loss analysis can also be performed without requiring flow capacity to be determined
at every point while drawing the installation. It is important only to define the flow
capacity at all ending points (ventilation diffusers and exhaust grilles) after the design
is completed, the program automatically calculates capacity and speed in all other elements
of the installation. Ventpack will display a warning message if this information is missing
at any one of the ending points. If the designer wants to regulate pressure at points other
than ending elements (e.g. with a damper on the outlet from the ventilation shaft),
he can insert a dampers (or other regulating elements) in the installation at the desired
regulation points and enter the required throttling pressure. Results obtained from pressure
loss calculations can be displayed on the drawing in the form of tables that show the following
information: flow capacity, flow speed, total pressure drop on each branch between the ventilator
and ending points, as well as the pressure to be throttled at each ending and regulation element.
The designer can determine exactly what information should be displayed in these frames,
which are placed on their own, separate layer.
All elements in the producer libraries have fixed hydraulic characteristics (Figure 6.).
For the other elements in the general libraries, designers should specify the value or
coefficient of local resistance, just as for all nonstandard elements. Thus, it is possible to
determine hydraulic characteristic even for nonstandard elements not contained in any of the libraries.
Zoom
Figure 6. The "FDBES - Element Propertis" dialog box.
The report of pressure drops calculation results is available as a table that can
be exported to a *.txt or *.xls file.
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