During a VSP/FPP Analysis, InfoWater Pro allows you to specify a target pressure to be maintained at a target junction node along with the minimum and maximum allowable speeds for each variable speed pump in the system. The lower and upper pump speed limits should represent a wide variety of operating conditions and should include the range where the pump is expected to operate. During the analysis, the program automatically computes the pump speed required to meet the targeted pressure at the target junction node.  If no solution can be found within the specified pump speed range, then InfoWater Pro will set the pump speed to the corresponding upper or lower speed limit. A warning message will also be issued indicating that no solution is available within the operating range specified. This closely describes actual variable speed pumping operation.


Methodology

To run a Variable Speed Pump analysis do the following:



           VSP/FPP Pumps

          

          VSP Pumps - The Pumps that were used for the Variable Speed Analysis are displayed here. Click on any of the pumps to see  their report. The red check indicates the pump that is currently displayed.

           Results for Pumps

Print - Click on Print to print the Report.

           Decimal places - Choose the number of decimal places that you want to display in your VSP report here.

Refresh - Use this to update the report with the latest run results.

Time - Simulation time step.

Speed Setting - The calculated speed setting at the simulation time step.

Pump Flow - The flow value calculated at the simulation time step and speed setting.

Controlled Pressure - The pressure calculated at the Target Junction Node at the specified simulation time step.

Target Pressure - The specified pressure to be maintained at the target junction node during the VSP Analysis.  InfoWater Pro will vary the pump speed between the min. and max. values to maintain this pressure.

Message Board

The message board displays messages during the VSP run.

Run

Choose the Run button to run your VSP analysis.

Close

Use this button to close out of the VSP analysis dialog box.




          Options

          Export Pumps - Specify whether all pumps or the selected pumps speed patterns are to be exported and associated for the listed pumps. To select a pump, click on the small square next

          to the Pump ID field to place a red check.

          Data Sets

          Control Set - Specify the location to export the calculated simple control set to identify the pump behavior. By selecting the Active Control Set, the currently active control set for that

          pump will be overwritten. To store the data in another control set, select the desired control set from the drop-down box.

          Operation Set - Specify the location to export the calculated pattern ID.  By selecting the Active Operation Set, the currently active operation set for that pump will be assigned with the

          new pattern created by the VSP Analysis.  To store the data in another operation set, select the desired operation set from the drop-down box.

          Available Pump Results

Sort - Sort pump IDs in ascending order. Sort pump IDs in descending order.

Pump ID - The Pump ID for which the VSP Analysis is to be conducted.  More than one pump can be analyzed during a VSP simulation.

Control Pattern ID - The name to be assigned to the new pump speed pattern that will be affiliated with the selected pump.  This pattern is required prior to running a Standard hydraulic simulation via the Run Manager.

Update Control

Once the Control and Operation Sets have been assigned, click on this button to create the new data sets.

Message Board

The message board displays messages during the VSP run.

Run

Choose the Run button to run your VSP analysis.

Close

Use this button to close out of the VSP analysis dialog box.