Buildings.HeatTransfer.Radiosity.BaseClasses

Information

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

Extends from Modelica.Icons.BasesPackage (Icon for packages containing base classes).

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

Extends from Buildings.BaseClasses.BaseIcon (Base icon).

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

Extends from Buildings.BaseClasses.BaseIcon (Base icon).

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, unit="K3")=T0^3 "3rd power of temperature T0";
 final parameter Real T04(min=0, 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;