Questions about Pumps and how to properly use them

[rmaige]

I'm struggling using the component 'Pump' of the library.
I tried to use it in one of my global model but the results were not corresponding to what I expected.
I tried to set up a centrifugal pump with a design point (V_flow_D, omega_D, TDH_D) and with parameters of the whole model (omgea=omega_D, tdh=TDH_D)
but the pump volume flow result is 30% greater than the design flow, where I expected to be a similar value as V_flow_D.

The reference pump when set with (omega=omega_ref, TDH=TDH_ref) and with boundary conditions Δp=Δp_ref is not returning V_flow_ref.
So I think I misunderstand the use of this pump and I would like to know how to properly use this component. Any explanation of such results are welcome.
I'm putting the .mo file where I test the pump with its reference characteristics as an attached file.

Thank you for your help,
Cordially

Rémy Maige

Details

The explanation of how I'm using this model is the following : I define the pump as a centrifugal pump and I keep the scaling parameters of the design point. I'm doing this hoping the current pump is the reference pump found in the documentation of the component.

The used Medium is the Extension of the Standard Water from ThermoFluidStream

I calculate the pressure difference according the TDH_ref and I find dp = 3.6610 * 998 * 9.81 = 0.35842 bar where 998 is the density of water at 20°C

I set the inlet pressure to 1 bar and the outlet pressure to 1.35842 bar. I use the omega_from_input = True to set the rotational speed to the reference speed of 314.2 rad/s.

The results from the simulation of this model are a volume flow of 5.89e-4 m^3/s when the reference volume flow is 3.06 e-3 m^3/s

I was also hoping to discuss in a second time how the scaling validity evolves with a pump which is very different from the reference pump. Actually, the pump I want to use has a design point of ( TDH = 25m , V_flow_D = 0.191 m^3/s, omega_D = 187.4 rad/s).

Test_Reference_Pump_ThermoFluidStream.zip