.BuildingSystems.Fluid.BaseClasses.MassFlowRateMultiplier

Information

This model multiplies the mass flow rate so that 0 = port_b.m_flow + gain * port_a.m_flow where gain > 0 is either equal to the input variable u if use_input is set to true, or equal to the parameter k if use_input is set to false.

The specific enthalpy, the species concentration and the trace substance concentration remain unchanged. Therefore, this model does not conserve mass or energy. It is used in BuildingSystems.Fluid.Geothermal.Borefields.BaseClasses.PartialBorefield and also in the Buildings library to avoid having to instantiate circuits in parallel, with each having the same mass flow rate and temperatures.

Revisions

• January 11, 2023, by Antoine Gautier:
  Added option to use input connector as multiplier factor.
  This is for #1684.
• March 27, 2013, by Michael Wetter:
  Changed implementation to extend from Modelica.Fluid.
• June 27, 2012, by Michael Wetter:
  First implementation.