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Manual Design and Plot
Use this option if you want to nominate the fan model, diameter and speed rather than let Centrix find one for the duty specified. Non standard fan diameters can be used with this option.
It is not necessary to have a volume and pressure entered if you choose this option.
There are two places where you can select the manual design option : The Duty Required form and the Fan Type Required Form.
You would generally use the Duty Required Form if you know you are going to manually design a fan from the start. Use the Fan Type Required form if Centrix can't find a selection you expect and you want to see the performance curve.
Use the manual design and plot option to:
1) Generate performance curves for any fan size, speed and width for comparison purposes.
2) Mechanically design a fan for standards purposes to suit a class or tip speed.
3) Mechanically design a fan given the diameter and speed without having to worry about the actual selection.
Standard diameters can be selected from the drop down box which will fill in the selected diameter box.
If you want to specify a non standard diameter type it into the selected diameter box. You may also have to type in a Nominal size to suit the diameter specified. (Note that the diameter you specify is for the whole fan including the casing and not just the impeller).
You can also type in any width in the chosen percentage width box. Values outside the range are highlighted red.
Enter the fixed speed required (highlighted Yellow) in the Fan Type Required Form.
Important : If you are mechanically designing the fan make sure that there is some sort of duty point specified.
1) Check the 'Generate a New Duty to suit this Fan' highlighted cyan unless you are comparing the curve with a specified duty point.
2) Click 'Next' then make sure there is a specified power point shown on the curve. You can add or change the power required by clicking the 'Options' button at the bottom of the curve and typing a new power value into the green box (read off the power value from the curve).
You can now continue to mechanically design the fan and produce drawings even for a non standard diameter.