.Annex60.Fluid.HeatExchangers.BaseClasses.PartialEffectiveness

Information

Partial model to implement heat exchanger models.

Classes that extend this model need to implement heat and mass balance equations in a form like

  // transferred heat
  Q1_flow = eps * QMax_flow;
  // no heat loss to ambient
  0 = Q1_flow + Q2_flow;
  // no mass exchange
  mXi1_flow = zeros(Medium1.nXi);
  mXi2_flow = zeros(Medium2.nXi);

Thus, if medium 1 is heated in this device, then Q1_flow > 0 and QMax_flow > 0.

Revisions

• June 9, 2015 by Michael Wetter:
  Changed type of T_in1 and T_in2 to Medium1.Temperature and Medium2.Temperature to avoid an error because of conflicting start values if Buildings.Examples.ChillerPlant.BaseClasses.Controls.Examples.ChillerSetPointControl is translated using pedantic mode in Dymola 2016. This is for #426.
• October 8, 2011, by Michael Wetter:
  Set show_T=false to avoid state events near zero flow.
• August 31, 2011, by Michael Wetter:
  Removed unused variables gai1 and gai2.
• February 12, 2010, by Michael Wetter:
  Changed model structure to implement effectiveness-NTU model.
• January 28, 2010, by Michael Wetter:
  Added regularization near zero flow.
• October 2, 2009, by Michael Wetter:
  Changed computation of inlet temperatures to use state_*_inflow which is already known in base class.
• April 28, 2008, by Michael Wetter:
  First implementation.