modelShadeRadiation

Model for infrared radiative heat balance of a layer that may or may not have a shade
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Information

Model for the infrared radiative heat balance of a shade that is at the outside or the room-side of a window. The model also includes the absorbed solar radiation.

The input port QAbs_flow needs to be connected to the solar radiation that is absorbed by the shade.

Parameters

TypeNameDefaultDescription
BooleanhomotopyInitializationtrue= true, use homotopy method
Modelica.Units.SI.AreaAHeat transfer area
Modelica.Units.SI.EmissivityabsIR_airInfrared absorptivity of surface that faces air
Modelica.Units.SI.EmissivityabsIR_glassInfrared absorptivity of surface that faces glass
Modelica.Units.SI.TransmissionCoefficienttauIR_airInfrared transmissivity of shade for radiation coming from the exterior or the room
Modelica.Units.SI.TransmissionCoefficienttauIR_glassInfrared transmissivity of shade for radiation coming from the glass
BooleanthisSideHasShadeSet to true if this side of the window has a shade
Modelica.Units.SI.ReflectionCoefficientrhoIR_air1 - absIR_air - tauIR_airInfrared reflectivity of surface that faces air
Modelica.Units.SI.ReflectionCoefficientrhoIR_glass1 - absIR_glass - tauIR_glassInfrared reflectivity of surface that faces glass
BooleanlinearizefalseSet to true to linearize emissive power
Modelica.Units.SI.TemperatureT0293.15Temperature used to linearize radiative heat transfer

Connectors

TypeNameDefaultDescription
Modelica.Blocks.Interfaces.RealInputuInput connector, used to scale the surface area to take into account an operable shading device
Modelica.Blocks.Interfaces.RealInputQSolAbs_flowSolar radiation absorbed by shade
Interfaces.RadiosityInflowJIn_airIncoming radiosity at the air-side surface of the shade
Interfaces.RadiosityInflowJIn_glassIncoming radiosity at the glass-side surface of the shade
Interfaces.RadiosityOutflowJOut_airOutgoing radiosity at the air-side surface of the shade
Interfaces.RadiosityOutflowJOut_glassOutgoing radiosity at the glass-side surface of the shade
Modelica.Blocks.Interfaces.RealOutputQRadAbs_flowTotal net radiation that is absorbed by the shade (positive if absorbed)
Modelica.Blocks.Interfaces.RealInputTShaShade temperature

Revisions

  • April 14, 2020, by Michael Wetter:
    Changed homotopyInitialization to a constant.
    This is for IBPSA, #1341.
  • May 30, 2014, by Michael Wetter:
    Removed undesirable annotation Evaluate=true.
  • June 11, 2013, by Michael Wetter:
    Redesigned model to separate convection from radiation, which is required for the implementation of a CFD model.
  • 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.
  • April 2, 2011 by Michael Wetter:
    Added homotopy operator.
  • February 3, by Michael Wetter:
    Corrected bug in start value of radiosity port and in heat balance of shade.
  • January 28 2011, by Michael Wetter:
    Fixed computation of convective heat balance between air, shade and glass.
  • November 3 2010, by Michael Wetter:
    First implementation.