modelPumpsParallel

Two flow machines in parallel
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Extends from Modelica.Icons.Example (Icon for runnable examples).

Information

This example tests the configuration of two flow machines that are installed in parallel. Both flow machines start with full speed. At t=150 second, the speed of the flow machine on the top is reduced to zero. As its speed is reduced, the mass flow rate changes its direction in such a way that the flow machine at the top has reverse flow.

Parameters

TypeNameDefaultDescription
Modelica.Units.SI.MassFlowRatem_flow_nominal1Nominal mass flow rate
Modelica.Units.SI.Densityrho_nominal1000Density, used to compute fluid mass

Components

TypeNameDefaultDescription
Buildings.Fluid.FixedResistances.PressureDropdpIn1Pressure drop
Buildings.Fluid.Movers.SpeedControlled_yfloMac1Model of a flow machine
Buildings.Fluid.FixedResistances.PressureDropdpOut1Pressure drop
Buildings.Fluid.Sources.Boundary_pTsou
Buildings.Fluid.FixedResistances.PressureDropdpInPressure drop
Buildings.Fluid.FixedResistances.PressureDropdpOut3Pressure drop
Buildings.Fluid.FixedResistances.PressureDropdpIn2Pressure drop
Buildings.Fluid.Movers.SpeedControlled_yfloMac2Model of a flow machine
Buildings.Fluid.FixedResistances.PressureDropdpOut2Pressure drop
Modelica.Blocks.Sources.Stepconst1

Contents

NameDescription
MediumMedium model

Revisions

  • February 20, 2016, by Ruben Baetens:
    Removal of dynamicBalance as parameter for massDynamics and energyDynamics.
  • April 2, 2015, by Filip Jorissen:
    Set constant speed for pump using a parameter instead of a realInput.
  • May 29, 2014, by Michael Wetter:
    Removed undesirable annotation Evaluate=true, and set rho_nominal to a constant to avoid a non-literal nominal value for V_flow_max and VMachine_flow.
  • February 14, 2012, by Michael Wetter:
    Added filter for start-up and shut-down transient.
  • March 24 2010, by Michael Wetter:
    First implementation.