.IDEAS.Buildings.Components.BoundaryWall

Information

This is a wall model that should be used to simulate a wall between a zone and a prescribed temperature or prescribed heat flow rate boundary condition. See IDEAS.Buildings.Components.Interfaces.PartialOpaqueSurface for equations, options, parameters, validation and dynamics that are common for all surfaces.

Main equations

Specific to this model is that the model does not contain a convection or radiative heat exchange model at the outside of the wall. Instead a prescribed temperature or heat flow rate may be set.

Typical use and important parameters

Parameters use_T_in and use_Q_in may be used to enable an input for a prescribed boundary condition temperature or heat flow rate. Alternatively, parameters use_T_fixed and T_fixed can be used to specify a fixed boundary condition temperature. It is not allowed to enabled multiple of these three options. If all are disabled then an adiabatic boundary (Q_flow=0) is used.

Revisions

• April 26, 2020, by Filip Jorissen:
  Refactored SolBus to avoid many instances in PropsBus. See #1131
• January 25, 2019, by Filip Jorissen:
  Revised initial equation implementation. See issue #971.
• December 2, 2018 by Filip Jorissen:
  Added option for setting fixed boundary condition temperature. See #961.
• August 10, 2018 by Damien Picard:
  Set nWin final to 1 as this should only be used for windows. See #888.
• March 22, 2017, by Filip Jorissen:
  Changes for JModelica compatibility.
• January 2, 2017, by Filip Jorissen:
  Updated icon layer.
• October 22, 2016, by Filip Jorissen:
  Revised documentation for IDEAS 1.0.
• December 7, 2016, by Damien Picard:
  Set placeCapacityAtSurf_b to false for last layer of layMul when T_in is used and the sim.lineariseDymola is true. Having a capacity connected directly to the prescribed temperature would require to have the derivative of T_in when linearized. The dynamics of the last layer is further set to dynamicFreeInitial when T_in is used to avoid an initialization problem.
• March 8, 2016, by Filip Jorissen:
  Fixed energyDynamics when using fixed temperature boundary condition input. This is discussed in issue 462.
• February 10, 2016, by Filip Jorissen and Damien Picard:
  Revised implementation: cleaned up connections and partials.
• June 14, 2015, Filip Jorissen:
  Adjusted implementation for computing conservation of energy.