Buildings.HeatTransfer.Data.OpaqueConstructions

Information

Package with material definitions for constructions with one or more layers of material. By convention, layer[1] is facing the outside, and the last layer is facing the room-side. This is the same convention as is used in EnergyPlus and in Window 6.

The parameters absIR_a and absIR_b are used to compute infrared heat radiation (in the infrared spectrum). The parameters absSol_a and absSol_b are used to compute solar heat radiation (in the solar spectrum).

Package Content

Name	Description
Generic	Thermal properties of opaque constructions
Insulation100Concrete200	Construction with 100 mm insulation and 200 mm concrete
Brick120	Construction with 120mm brick
Concrete200	Construction with 200mm concrete

Buildings.HeatTransfer.Data.OpaqueConstructions.Generic

Information

The parameters absIR_a and absIR_b are used to compute infrared heat radiation (in the infrared spectrum). The parameters absSol_a and absSol_b are used to compute solar heat radiation (in the solar spectrum).

The parameter roughness_a is used if the convective heat transfer coefficient of the exterior surface is computed based on the wind-speed, wind-direction and temperature difference. See Buildings.HeatTransfer.Convection.Exterior.

Parameters

Type	Name	Default	Description
Integer	nLay		Number of layers
Material	material[nLay]		Layer by layer declaration of material, starting from outside to room-side
Emissivity	absIR_a	0.9	Infrared absorptivity of surface a (usually outside-facing surface) [1]
Emissivity	absIR_b	0.9	Infrared absorptivity of surface b (usually room-facing surface) [1]
Emissivity	absSol_a	0.5	Solar absorptivity of surface a (usually outside-facing surface) [1]
Emissivity	absSol_b	0.5	Solar absorptivity of surface b (usually room-facing surface) [1]
SurfaceRoughness	roughness_a	Buildings.HeatTransfer.Types...	Exterior surface roughness

Modelica definition

record Generic "Thermal properties of opaque constructions"
  parameter Integer nLay(min=1, fixed=true) "Number of layers";
  parameter Buildings.HeatTransfer.Data.BaseClasses.Material material[nLay] 
    "Layer by layer declaration of material, starting from outside to room-side";
 final parameter Real R(unit="m2.K/W")=sum(material[:].R) 
    "Thermal resistance per unit area";

 parameter Modelica.SIunits.Emissivity absIR_a=0.9 
    "Infrared absorptivity of surface a (usually outside-facing surface)";
 parameter Modelica.SIunits.Emissivity absIR_b=0.9 
    "Infrared absorptivity of surface b (usually room-facing surface)";
 parameter Modelica.SIunits.Emissivity absSol_a=0.5 
    "Solar absorptivity of surface a (usually outside-facing surface)";
 parameter Modelica.SIunits.Emissivity absSol_b=0.5 
    "Solar absorptivity of surface b (usually room-facing surface)";
 parameter Buildings.HeatTransfer.Types.SurfaceRoughness roughness_a=
    Buildings.HeatTransfer.Types.SurfaceRoughness.Medium 
    "Exterior surface roughness";


end Generic;

Buildings.HeatTransfer.Data.OpaqueConstructions.Insulation100Concrete200

Parameters

Type	Name	Default	Description
Integer	nLay	2	Number of layers
Material	material[nLay]	{Solids.InsulationBoard(x=0....	Layer by layer declaration of material, starting from outside to room-side
Emissivity	absIR_a	0.9	Infrared absorptivity of surface a (usually outside-facing surface) [1]
Emissivity	absIR_b	0.9	Infrared absorptivity of surface b (usually room-facing surface) [1]
Emissivity	absSol_a	0.5	Solar absorptivity of surface a (usually outside-facing surface) [1]
Emissivity	absSol_b	0.5	Solar absorptivity of surface b (usually room-facing surface) [1]
SurfaceRoughness	roughness_a	Buildings.HeatTransfer.Types...	Exterior surface roughness

Modelica definition

record Insulation100Concrete200 =
    Buildings.HeatTransfer.Data.OpaqueConstructions.Generic (material={
        Solids.InsulationBoard(x=0.1),Solids.Concrete(x=0.2)}, final nLay=2) 
  "Construction with 100 mm insulation and 200 mm concrete";

Buildings.HeatTransfer.Data.OpaqueConstructions.Brick120

Parameters

Type	Name	Default	Description
Integer	nLay	1	Number of layers
Material	material[nLay]	{Solids.Brick(x=0.12)}	Layer by layer declaration of material, starting from outside to room-side
Emissivity	absIR_a	0.9	Infrared absorptivity of surface a (usually outside-facing surface) [1]
Emissivity	absIR_b	0.9	Infrared absorptivity of surface b (usually room-facing surface) [1]
Emissivity	absSol_a	0.5	Solar absorptivity of surface a (usually outside-facing surface) [1]
Emissivity	absSol_b	0.5	Solar absorptivity of surface b (usually room-facing surface) [1]
SurfaceRoughness	roughness_a	Buildings.HeatTransfer.Types...	Exterior surface roughness

Modelica definition

record Brick120 =
    Buildings.HeatTransfer.Data.OpaqueConstructions.Generic (material={
        Solids.Brick(x=0.12)}, final nLay=1) "Construction with 120mm brick";

Buildings.HeatTransfer.Data.OpaqueConstructions.Concrete200

Parameters

Type	Name	Default	Description
Integer	nLay	1	Number of layers
Material	material[nLay]	{Solids.Concrete(x=0.2)}	Layer by layer declaration of material, starting from outside to room-side
Emissivity	absIR_a	0.9	Infrared absorptivity of surface a (usually outside-facing surface) [1]
Emissivity	absIR_b	0.9	Infrared absorptivity of surface b (usually room-facing surface) [1]
Emissivity	absSol_a	0.5	Solar absorptivity of surface a (usually outside-facing surface) [1]
Emissivity	absSol_b	0.5	Solar absorptivity of surface b (usually room-facing surface) [1]
SurfaceRoughness	roughness_a	Buildings.HeatTransfer.Types...	Exterior surface roughness

Modelica definition

record Concrete200 =
    Buildings.HeatTransfer.Data.OpaqueConstructions.Generic (material={
        Solids.Concrete(x=0.2)}, final nLay=1) 
  "Construction with 200mm concrete";