modelGlassLayer

Model for a glass layer of a window assembly
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Extends from Buildings.HeatTransfer.Radiosity.BaseClasses.RadiosityTwoSurfaces (Model for the radiosity balance of a device with two surfaces), Buildings.HeatTransfer.Radiosity.BaseClasses.ParametersTwoSurfaces (Parameters that are used to model two surfaces with the same area).

Information

Model of a single layer of window glass. The input port QAbs_flow needs to be connected to the solar radiation that is absorbed by the glass pane. The model computes the heat conduction between the two glass surfaces. The heat flow QAbs_flow is added at the center of the glass.

Parameters

TypeNameDefaultDescription
Modelica.Units.SI.AreaA (from RadiosityTwoSurfaces)Heat transfer area
Modelica.Units.SI.EmissivityabsIR_a (from ParametersTwoSurfaces)Infrared absorptivity of surface a
Modelica.Units.SI.EmissivityabsIR_b (from ParametersTwoSurfaces)Infrared absorptivity of surface b
Modelica.Units.SI.ReflectionCoefficientrhoIR_a (from ParametersTwoSurfaces)Infrared reflectivity of surface a
Modelica.Units.SI.ReflectionCoefficientrhoIR_b (from ParametersTwoSurfaces)Infrared reflectivity of surface b
Modelica.Units.SI.TransmissionCoefficienttauIR (from ParametersTwoSurfaces)Infrared transmissivity of glass pane
Booleanlinearize (from ParametersTwoSurfaces)falseSet to true to linearize emissive power
Modelica.Units.SI.TemperatureT0 (from ParametersTwoSurfaces)293.15Temperature used to linearize radiative heat transfer
BooleanhomotopyInitializationtrue= true, use homotopy method
Modelica.Units.SI.LengthxMaterial thickness
Modelica.Units.SI.ThermalConductivitykThermal conductivity

Connectors

TypeNameDefaultDescription
Buildings.HeatTransfer.Interfaces.RadiosityInflowJIn_a (from RadiosityTwoSurfaces)Incoming radiosity at surface a
Buildings.HeatTransfer.Interfaces.RadiosityInflowJIn_b (from RadiosityTwoSurfaces)Incoming radiosity at surface b
Buildings.HeatTransfer.Interfaces.RadiosityOutflowJOut_a (from RadiosityTwoSurfaces)Outgoing radiosity at surface a
Buildings.HeatTransfer.Interfaces.RadiosityOutflowJOut_b (from RadiosityTwoSurfaces)Outgoing radiosity at surface b
Modelica.Blocks.Interfaces.RealInputuInput connector, used to scale the surface area to take into account an operable shading device
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_aport_aHeat port at surface a
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_bport_bHeat port at surface b
Modelica.Blocks.Interfaces.RealInputQAbs_flowSolar radiation absorbed by glass

Revisions

  • April 14, 2020, by Michael Wetter:
    Changed homotopyInitialization to a constant.
    This is for IBPSA, #1341.
  • October 24, 2016, by Michael Wetter:
    Removed declarations of A, absIR_a, absIR_b and tauIR, which are already declared in the base class.
  • December 8, 2014, by Michael Wetter:
    Added term tauIR * (JIn_a - JIn_b) to heat balance. This is to correct issue #304 that led to an error in the glass temperatures if the glass conductance is very small.
  • October 17, 2014, by Michael Wetter:
    Removed nominal value for heat ports as the default is already 300 Kelvin.
  • October 15, 2014, by Michael Wetter:
    Changed type of tauIR from Modelica.Units.SI.Emissivity to Modelica.Units.SI.TransmissionCoefficient. This avoids a type error in OpenModelica.
  • June 27, 2013, by Michael Wetter:
    Changed model because the outflowing radiosity has been changed to be a non-negative quantity. See track issue #158.
  • March 20, 2012 by Wangda Zuo:
    Fixed bug for heat flow reported by Pierre Tittelein and fixed bug for temperature linearization.
  • April 2, 2011 by Michael Wetter:
    Added homotopy operator.
  • August 18 2010, by Michael Wetter:
    First implementation.