.BuildingSystems.Fluid.Actuators.Valves.TwoWayPolynomial

Information

Two way valve with polynomial opening characteristic. The polynomial coefficients are defined using parameter c. The elements of c are coefficients for increasing powers of y, starting with the power 0, which corresponds to a fixed offset. This valve model can be used to implement valves with a custom opening characteristic, such as a combination of a linear and an equal percentage characteristic.

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.

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.
• September 30, 2017 by Filip Jorissen:
  First implementation.