modelTwoWayQuickOpening

Two way valve with quick opening flow characteristics

Extends from BaseClasses.PartialTwoWayValveKv.

Information

Two way valve with a power function for the valve opening characteristic. Valves that need to open quickly typically have such a valve characteristics.

This model is based on the partial valve model BuildingSystems.Fluid.Actuators.BaseClasses.PartialTwoWayValve. Check this model for more information, such as the regularization near the origin.

Parameters

TypeNameDefaultDescription
Realalp2Parameter for valve characteristics, alp>0
Realdelta00.01Range of significant deviation from power law

Revisions

  • June 10, 2021, by Michael Wetter:
    Changed implementation of the filter and changed the parameter order to a constant as most users need not change this value.
    This is for #1498.
  • August 7, 2020, by Ettore Zanetti:
    changed the computation of phi using max(0.1*l, . ) to avoid phi=0. See issue 1376.
  • November 9, 2019, by Filip Jorissen:
    Guarded the computation of phi using max(0, . ) to avoid negative phi. See issue 1223.
  • April 4, 2014, by Michael Wetter:
    Moved the assignment of the flow function phi to the model instantiation because in its base class, the keyword input has been added to the variable phi.
  • March 27, 2014 by Michael Wetter:
    Revised model for implementation of new valve model that computes the flow function based on a table.
  • February 20, 2012 by Michael Wetter:
    Renamed parameter dp_nominal to dpValve_nominal, and added new parameter dpFixed_nominal=0. See BuildingSystems.Fluid.Actuators.UsersGuide.
  • March 25, 2011, by Michael Wetter:
    Added homotopy method.
  • June 3, 2008 by Michael Wetter:
    First implementation.