[EnergyPlus_Support] Pump Power calculations

["JV Dirkes II" <jvd2pe@xxxxxxx>]

Dear E+ Forum,

For ASHRAE 90.1 baseline models, a pump is limited to a specific unit
power (e.g., 22W / gpm for chilled water pumps).  I want to autosize
the pumps, but use a Delta P and motor efficiency that will always
result in the desired unit power.  My derivation of that Delta P value
does NOT result in the power level that I expect when I run E+. So,
either my derivation is incorrect, or E+ calculates the power in a
different manner.
Will someone direct me to the E+ power formula for situations when the
pump is autosized?  I must be missing something, but cannot find it in
"Help".  Thanks!


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