modelExample1v2

Example 1 model with mixing volume

Extends from BuildingSystems.Fluid.Examples.Performance.BaseClasses.Example1.

Information

This example is an extension of BuildingSystems.Fluid.Examples.Performance.Example1v1 and demonstrates the use of mixing volumes for decoupling the algebraic loop that solves for the enthalpy of the system.

Example1v1:

Sizes of nonlinear systems of equations: {6, 21, 46}

Sizes after manipulation of the nonlinear systems: {1, 19, 22}

Example1v2 using mixing volumes:

Sizes of nonlinear systems of equations: {6, 21, 4}

Sizes after manipulation of the nonlinear systems: {1, 19, 1}

See Jorissen et al. (2015) for a discussion.

References

  • Filip Jorissen, Michael Wetter and Lieve Helsen.
    Simulation speed analysis and improvements of Modelica models for building energy simulation.
    Submitted: 11th Modelica Conference. Paris, France. Sep. 2015.

Parameters

TypeNameDefaultDescription
Modelica.Units.SI.Timetau10Time constant at nominal flow

Components

TypeNameDefaultDescription
Fluid.Delays.DelayFirstOrdervolMixing volumes for adding states in enthalpy circuit

Revisions

  • August 31, 2015, by Michael Wetter:
    Added missing each in declaration of the energy balance for the volume.
  • July 14, 2015, by Michael Wetter:
    Revised documentation.
  • April 17, 2015, by Filip Jorissen:
    First implementation.