.AixLib.Fluid.Movers.Validation.ComparePowerHydraulic

Information

The purpose of this validation is two-fold.

First, it validates that efficiency computation is implemented correctly for per.powerOrEfficiencyIsHydraulic=true. The results should show that η = η_hyd η_mot holds.

Second, it compares the power estimation results using different selections of per.etaHydMet.

• The fan mov1 directly uses the power curve of the fan.
• The fan mov2 uses the Euler number method to estimate the hydraulic efficiency and computer the power consumption.
• The fan mov3 assumes a constant hydraulic efficiency to compute the power consumption.

The three methods agree with each other when the three fans operate at different speeds under constant system condition. Their power estimates diverge when the damper closes and the system curve is changed. The Euler number method was able to produce results close to the power curves and maintained positive power consumption as the flow rate approached zero. However, the constant efficiency assumption was not able to capture this characteristic.

Revisions

• May 15, 2024, by Hongxiang Fu:
  First implementation. This is for IBPSA, #1880.