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Ukoj98
Ukoj98

Reputation: 1

Integrating pump curve in Modellica.Fluid.Machines.ControlledPump

I'm a new user of OpenModelica. I'm trying to initialise variable-speed hydraulic pump curves in Modelica. I have 15 volumetric flow rates (m3/h) and 15 pump heads (m) for each pump speed (rev/min). I have been trying to use the following code for inputting these values into my model.

redeclare function flowCharacteristic =
    Modelica.Fluid.Machines.BaseClasses.PumpCharacteristics.quadraticFlow (V_flow_nominal={},head_nominal={})

I encounter a translation error because the read-only system library only allows 3 elements in the V_flow_nominal and head_nominal array.

  1. How do I obviate the error and still enter all data points I have?
  2. How do I convert to SI units (m3/s and Pa)?

Upvotes: 0

Views: 243

Answers (1)

Imke Krueger
Imke Krueger

Reputation: 786

Setting the flowCharacteristic to Modelica.Fluid.Machines.BaseClasses.PumpCharacteristics.polynomialFlow should solve your problem for one speed. Values for other speeds are interpolated from this set of values. If you want to enter different values for other speeds you need a map-based model.

Upvotes: 1

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