modelScreen

Controllable exterior screen
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Extends from IDEAS.Buildings.Components.Shading.Interfaces.PartialShadingDevice.

Information

Shading model of a controllable screen. The transmitted direct solar irradiance varies linearly between [0, 1] with the control input. A fraction shaCorr is converted into diffuse light that enters the building.

Parameters

TypeNameDefaultDescription
Booleancontrolled (from PartialShading)trueif true, shading has a control input
Modelica.Units.SI.AreaA_glazing (from PartialShading)Surface area of the glazing
Modelica.Units.SI.AreaA_frame (from PartialShading)Surface area of the frame
Modelica.Units.SI.Angleinc (from PartialShading)Surface inclination
Modelica.Units.SI.TemperatureTenv_nom (from PartialShading)280Nominal temperature of environment
Modelica.Units.SI.EmissivityepsSw_frame (from PartialShading)Short wave solar absorption coefficient of the frame
Modelica.Units.SI.EmissivityepsLw_frame (from PartialShading)Long wave solar absorption coefficient of the frame
Modelica.Units.SI.EmissivityepsLw_glazing (from PartialShading)Long wave solar absorption coefficient of the glazing
Modelica.Units.SI.EmissivityepsSw_shading (from PartialShading)0.8Short wave emissivity of the shading object
Realg_glazing (from PartialShading)Nominal shading coefficient of the glazing
BooleanlinCon (from PartialShading)falseLinearise convective heat transfer
BooleanlinRad (from PartialShading)falseLinearise radiative heat transfer
BooleanhaveBoundaryPorts (from PartialShading)trueInclude ports for setting boundary conditions
BooleanhaveFrame (from PartialShading)A_frame*epsLw_frame > 0Frame enabled
Modelica.Units.SI.CoefficientOfHeatTransferhSha (from PartialShading)12Equivalent thermal conductance of the shading device
RealshaCorr0.24Shortwave transmittance of the screen
RealrefSw_shading0Shortwave reflectance of the screen
Window properties
Modelica.Units.SI.Angleazi (from PartialShading)Window azimuth angle

Connectors

TypeNameDefaultDescription
Modelica.Blocks.Interfaces.RealInputHDirTil (from PartialShading)Direct solar illuminance on surface
Modelica.Blocks.Interfaces.RealInputHSkyDifTil (from PartialShading)Diffuse sky solar illuminance on tilted surface
Modelica.Blocks.Interfaces.RealInputHGroDifTil (from PartialShading)Diffuse ground solar illuminance on tilted surface
Modelica.Blocks.Interfaces.RealInputangZen (from PartialShading)Angle of incidence
Modelica.Blocks.Interfaces.RealOutputHShaDirTil (from PartialShading)Shaded direct solar illuminance on surface
Modelica.Blocks.Interfaces.RealOutputHShaSkyDifTil (from PartialShading)Shaded diffuse sky solar illuminance on tilted surface
Modelica.Blocks.Interfaces.RealOutputHShaGroDifTil (from PartialShading)Shaded diffuse ground solar illuminance on tilted surface
Modelica.Blocks.Interfaces.RealOutputiAngInc (from PartialShading)Angle of incidence after transmittance through (possible) shading
Modelica.Blocks.Interfaces.RealInputangInc (from PartialShading)Inclination angle
Modelica.Blocks.Interfaces.RealInputangAzi (from PartialShading)Azimuth angle
Modelica.Blocks.Interfaces.RealInputCtrl (from PartialShading)Control signal between 0 and 1, i.e. 1 is fully closed
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_bport_frame (from PartialShading)
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_aport_glazing (from PartialShading)
Modelica.Blocks.Interfaces.RealInputTEnv (from PartialShading)Environment temperature
Modelica.Blocks.Interfaces.RealInputTe (from PartialShading)
Modelica.Blocks.Interfaces.RealInputhForcedConExt (from PartialShading)
Modelica.Blocks.Interfaces.RealOutputTDryBul (from PartialShading)Exterior surface air temperature
Modelica.Blocks.Interfaces.RealInputm_flow (from PartialShading)

Components

TypeNameDefaultDescription
Modelica.Units.SI.IrradianceHSha (from PartialShading)HShaDirTil + HShaSkyDifTil + HShaGroDifTilTotal shaded solar irradiance
Modelica.Units.SI.IrradianceH (from PartialShading)HDirTil + HSkyDifTil + HGroDifTilTotal unshaded solar irradiance
IDEAS.Buildings.Components.BaseClasses.RadiativeHeatTransfer.ExteriorHeatRadiationskyRadFra (from PartialShadingDevice)
IDEAS.Buildings.Components.BaseClasses.ConvectiveHeatTransfer.ExteriorConvectioneConFra (from PartialShadingDevice)
IDEAS.Buildings.Components.BaseClasses.RadiativeHeatTransfer.ExteriorSolarAbsorptionsolAbs (from PartialShadingDevice)
IDEAS.Buildings.Components.BaseClasses.RadiativeHeatTransfer.ExteriorHeatRadiationskyRad (from PartialShadingDevice)
IDEAS.Buildings.Components.BaseClasses.ConvectiveHeatTransfer.ExteriorConvectioneCon (from PartialShadingDevice)
Modelica.Blocks.Math.AddsolDif (from PartialShadingDevice)
Modelica.Blocks.Sources.RealExpressionTeExpr (from PartialShadingDevice)Expression for Te
Modelica.Blocks.Sources.RealExpressionTEnvExpr (from PartialShadingDevice)Expression for TEnv

Revisions

  • July 26, 2024 by Jelger Jansen:
    Replace Ctrl by Ctrl_internal to avoid using a conditional component in a connect statement. See #1367.
  • June 12, 2024 by Lucas Verleyen:
    Remove limiter block. See #1290.
  • September 7, 2023 by Filip Jorissen:
    Created flow rate dependency for screen surface temperature.
  • July 9, 2023 by Filip Jorissen:
    Added reflectance coefficient parameter. No longer converting transmitted direct solar irradiation into diffuse solar irradiation.
  • July 18, 2022 by Filip Jorissen:
    Refactored for #1270 for including thermal effect of screens.
  • May 26, 2017 by Filip Jorissen:
    Revised implementation for renamed ports HDirTil etc. See #735.
  • July 18, 2016 by Filip Jorissen:
    Cleaned up implementation and documentation.