Fixed Flow VSP
Fixed flow VSP enables the user to model a pump that is controlled to deliver a desired amount of flow. This can be a typical control case when a pump is supplying water to an "open" system where a tank is located in the downstream distribution system. It is unlikely that a pump is expected to supply the fixed flow to a "closed" system where no tank is located at the downstream of a pump.
WaterCAD 2024 facilitates the fixed flow VSP modeling. It automatically calculates the required pump speed, up to the maximum relative speed factor, to move the required flow through a pump. Multiple vsps can be in parallel and expected to deliver different target flows. To apply this feature, follow the steps below:
- Click on a VSP.
- Set the attribute Is Variable Speed pump? to True.
- Set VSP Type as Fixed Flow.
- Specify the maximum relative speed factor.
- Specify the Target Flow for the vsp.
In the case of a VSPB, the target flow will be evenly divided among all the lead and lag VSPs.