.Buildings.Fluid.HeatExchangers.BaseClasses.epsilon_ntuZ

Information

This function computes the heat exchanger effectiveness for a given number of transfer units, capacity flow ratio and heat exchanger flow regime. The different options for the flow regime are declared in Buildings.Fluid.Types.HeatExchangerFlowRegime.

Interface

function epsilon_ntuZ
  input Real NTU "Number of transfer units";
  input Real Z(min = 0, max = 1) "Ratio of capacity flow rate (CMin/CMax)";
  input Integer flowRegime "Heat exchanger flow regime, see Buildings.Fluid.Types.HeatExchangerFlowRegime";
  output Real eps(min = 0, max = 1) "Heat exchanger effectiveness";
end epsilon_ntuZ;

Revisions

• February 7, 2025, by Jelger Jansen:
  Removed import statement. This is for IBPSA, #1961.
• September 28, 2016, by Massimo Cimmino:
  Added case for constant temperature phase change on one side of the heat exchanger.
• July 7, 2014, by Michael Wetter:
  Changed the type of the input flowRegime from Buildings.Fluid.Types.HeatExchangerFlowRegime to Integer. This was required because this argument is passed in Dymola 2015 in the function Buildings.Fluid.HeatExchangers.BaseClasses.epsilon_C as an integer. Without this change, a translation warning occurs.
• September 25, 2013, by Michael Wetter:
  Changed test in the assert statement as OpenModelica had an error when comparing enumerations with integers.
• February 11, 2010, by Michael Wetter:
  First implementation.