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What are the benefits of using variable speed pump batteries (VSPB) element and how it works?
The VSPB element gives you the ability to model multiple pumps that would otherwise be modeled as parallel variable speed pumps (that use the same pump definition and target nodes) in one element. It saves you time to use this element vs. laying out and inputting pump information for multiple pumps.
The VSPB allows you to enter one pump definition that applies to all the pumps that are defined in the properties. There is one lead pump and you input the number of lag pumps in the properties that turn on automatically when the lead pump is not able to meet the target head or target flow while maintaining a relative speed factor that is below the maximum defined in the properties (default is 1.00 or 100% of the max operating speed). When a lag pump is triggered both it and the lead will run at the same relative speed factor. This process will occur every time a lead and/or lag pump cannot meet the desired head or flow while maintaining a relative speed factor below the maximum.
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