Buildings.HeatTransfer.Radiosity.BaseClasses

Information

This package contains base classes that are used to construct the models in Buildings.HeatTransfer.Radiosity.

Package Content

Name	Description
RadiosityTwoSurfaces	Model for the radiosity balance of a device with two surfaces
RadiosityOneSurface	Model for the radiosity balance of a device with one surface
ParametersOneSurface	Parameters that are used to model one surface
ParametersTwoSurfaces	Parameters that are used to model two surfaces with the same area

Buildings.HeatTransfer.Radiosity.BaseClasses.RadiosityTwoSurfaces

Information

Parameters

Type	Name	Default	Description
Area	A		Surface area [m2]

Connectors

Type	Name	Description
input RadiosityInflow	JIn_a	Incoming radiosity at surface a [W]
input RadiosityInflow	JIn_b	Incoming radiosity at surface b [W]
output RadiosityOutflow	JOut_a	Outgoing radiosity at surface a [W]
output RadiosityOutflow	JOut_b	Outgoing radiosity at surface b [W]

Modelica definition

partial block RadiosityTwoSurfaces 
  "Model for the radiosity balance of a device with two surfaces"
  extends Buildings.BaseClasses.BaseIcon;
  parameter Modelica.SIunits.Area A "Surface area";

  Buildings.HeatTransfer.Interfaces.RadiosityInflow JIn_a(start=A*0.8*Modelica.Constants.sigma*293.15^4) 
    "Incoming radiosity at surface a";
  Buildings.HeatTransfer.Interfaces.RadiosityInflow JIn_b(start=A*0.8*Modelica.Constants.sigma*293.15^4) 
    "Incoming radiosity at surface b";
  Buildings.HeatTransfer.Interfaces.RadiosityOutflow JOut_a 
    "Outgoing radiosity at surface a";
  Buildings.HeatTransfer.Interfaces.RadiosityOutflow JOut_b 
    "Outgoing radiosity at surface b";

end RadiosityTwoSurfaces;

Buildings.HeatTransfer.Radiosity.BaseClasses.RadiosityOneSurface

Information

Parameters

Type	Name	Default	Description
Area	A		Surface area [m2]

Connectors

Type	Name	Description
input RadiosityInflow	JIn	Incoming radiosity [W]
output RadiosityOutflow	JOut	Outgoing radiosity [W]

Modelica definition

partial model RadiosityOneSurface 
  "Model for the radiosity balance of a device with one surface"
  extends Buildings.BaseClasses.BaseIcon;
  parameter Modelica.SIunits.Area A "Surface area";

  Buildings.HeatTransfer.Interfaces.RadiosityInflow JIn(start=A*0.8*Modelica.Constants.sigma*293.15^4) 
    "Incoming radiosity";
  Buildings.HeatTransfer.Interfaces.RadiosityOutflow JOut "Outgoing radiosity";

end RadiosityOneSurface;

Buildings.HeatTransfer.Radiosity.BaseClasses.ParametersOneSurface

Information

Parameters that are used for classes with one surface.

Parameters

Type	Name	Default	Description
Emissivity	absIR		Infrared absorptivity [1]
ReflectionCoefficient	rhoIR		Infrared reflectivity [1]
TransmissionCoefficient	tauIR		Infrared transmissivity [1]
Boolean	linearize	false	Set to true to linearize emissive power
Temperature	T0	293.15	Temperature used to linearize radiative heat transfer [K]

Modelica definition

model ParametersOneSurface 
  "Parameters that are used to model one surface"
  parameter Modelica.SIunits.Emissivity absIR "Infrared absorptivity";
  parameter Modelica.SIunits.ReflectionCoefficient rhoIR 
    "Infrared reflectivity";
  parameter Modelica.SIunits.TransmissionCoefficient tauIR 
    "Infrared transmissivity";
  parameter Boolean linearize=false "Set to true to linearize emissive power";
  parameter Modelica.SIunits.Temperature T0=293.15 
    "Temperature used to linearize radiative heat transfer";
protected 
 final parameter Real T03(min=0, unit="K3")=T0^3 "3rd power of temperature T0";

initial equation 
  assert(abs(1-absIR-rhoIR-tauIR) < Modelica.Constants.eps,
    "Absorptivity, reflectivity and transmissivity do not add up to one. Check parameters.");

end ParametersOneSurface;

Buildings.HeatTransfer.Radiosity.BaseClasses.ParametersTwoSurfaces

Information

Parameters that are used for classes with two surfaces.

Parameters

Type	Name	Default	Description
Emissivity	absIR_a		Infrared absorptivity of surface a [1]
Emissivity	absIR_b		Infrared absorptivity of surface b [1]
ReflectionCoefficient	rhoIR_a		Infrared reflectivity of surface a [1]
ReflectionCoefficient	rhoIR_b		Infrared reflectivity of surface b [1]
TransmissionCoefficient	tauIR		Infrared transmissivity of glass pane [1]
Boolean	linearize	false	Set to true to linearize emissive power
Temperature	T0	293.15	Temperature used to linearize radiative heat transfer [K]

Modelica definition

model ParametersTwoSurfaces 
  "Parameters that are used to model two surfaces with the same area"
  parameter Modelica.SIunits.Emissivity absIR_a 
    "Infrared absorptivity of surface a";
  parameter Modelica.SIunits.Emissivity absIR_b 
    "Infrared absorptivity of surface b";
  parameter Modelica.SIunits.ReflectionCoefficient rhoIR_a 
    "Infrared reflectivity of surface a";
  parameter Modelica.SIunits.ReflectionCoefficient rhoIR_b 
    "Infrared reflectivity of surface b";
  parameter Modelica.SIunits.TransmissionCoefficient tauIR 
    "Infrared transmissivity of glass pane";
  parameter Boolean linearize = false "Set to true to linearize emissive power";
  parameter Modelica.SIunits.Temperature T0=293.15 
    "Temperature used to linearize radiative heat transfer";
protected 
 final parameter Real T03(min=0, final unit="K3")=T0^3 
    "3rd power of temperature T0";
 final parameter Real T04(min=0, final unit="K4")=T0^4 
    "4th power of temperature T0";
initial equation 
    assert(abs(1-absIR_a-rhoIR_a-tauIR) < Modelica.Constants.eps,
    "Absorptivity, reflectivity and transmissivity of surface a do not add up to one. Check parameters.");
    assert(abs(1-absIR_b-rhoIR_b-tauIR) < Modelica.Constants.eps,
    "Absorptivity, reflectivity and transmissivity of surface b do not add up to one. Check parameters.");

end ParametersTwoSurfaces;