recordGeneric

Information

Record containing parameters for pumps or fans.

Typical use

This record may be used to assign for example fan performance data using declaration such as

  IBPSA.Fluid.Movers.SpeedControlled_y fan(
    redeclare package Medium = Medium,
      per(pressure(V_flow={0,m_flow_nominal,2*m_flow_nominal}/1.2,
                   dp={2*dp_nominal,dp_nominal,0}))) "Fan";

This data record can be used with IBPSA.Fluid.Movers.SpeedControlled_Nrpm, IBPSA.Fluid.Movers.SpeedControlled_y, IBPSA.Fluid.Movers.FlowControlled_dp, IBPSA.Fluid.Movers.FlowControlled_m_flow.

An example that uses manufacturer data can be found in IBPSA.Fluid.Movers.Validation.Pump_Nrpm_stratos.

Declaration of the peak condition

The variable peak is intentionally declared in a way that each of its element is declared individually. If it was delcared the same way as does peak_internal, Modelica would prevent the modification of its specific elements with the following error message:
Record has a value, and attempt to modify specific elements.
The element modification of e.g. V_flow will be ignored.
The other variable peak_internal uses a function call to compute its default values. By passing them to peak one by one, the model can both have default values and also allow the user to override them easily. See Modelica Specification issue #791.

Parameters in RPM

The parameters speed_rpm_nominal, constantSpeed_rpm and speeds_rpm are used to assign the non-dimensional speeds

  parameter Real constantSpeed(final min=0, final unit="1") = constantSpeed_rpm/speed_rpm_nominal;
  parameter Real[:] speeds(each final min = 0, each final unit="1") = speeds_rpm/speed_rpm_nominal;

In addition, speed_rpm_nominal is used in IBPSA.Fluid.Movers.SpeedControlled_Nrpm to normalize the control input signal. Otherwise, these speed parameters in RPM are not used in the models.

Parameters

Revisions

• March 1, 2022, by Hongxiang Fu:
  
  • Modified the record to allow separate specifications of different efficiency variables.
  • Added parameters for computation using Euler number.
  • Added parameters for providing the motor efficiency as an array vs. motor part load ratio.
  • Moved the computation of V_flow_max here from IBPSA.Fluid.Movers.BaseClasses.PartialFlowMachine and dpMax here from IBPSA.Fluid.Movers.BaseClasses.FlowMachineInterface
  These are for #2668.
• February 19, 2016, by Filip Jorissen:
  Refactored model such that SpeedControlled_Nrpm, SpeedControlled_y and FlowControlled are integrated into one record. This is for #417.
• February 17, 2016, by Michael Wetter:
  Changed parameter N_nominal to speed_rpm_nominal as it is the same quantity as speeds_rmp. This is for #396.
• January 19, 2016, by Filip Jorissen:
  Added parameter speeds_rpm. This is for #396.
• February 13, 2015, by Michael Wetter:
  Updated documentation.
• January 6, 2015, by Michael Wetter:
  Revised record for OpenModelica.
• November 22, 2014 by Michael Wetter:
  First implementation.