Buildings.HeatTransfer.Data.Glasses

Information

Since the infrared transmissivity is part of the Window 5 data and since it depends on the glass thickness, the glass thickness is a parameter that is set for all glass layers. This configuration is different from the records fo gas properties, which do not yet set the value for the thickness of the gas gap.

Extends from Modelica.Icons.MaterialPropertiesPackage (Icon for package containing property classes).

Package Content

Name	Description
Generic	Thermal properties of window glass
ID100	Generic Bronze Glass 3.1mm. Manufacturer: Generic.
ID101	Generic Bronze Glass 5.7mm. Manufacturer: Generic.
ID102	Generic Clear Glass 3.048mm. Manufacturer: Generic.
ID103	Generic Clear Glass 5.7mm. Manufacturer: Generic.

Buildings.HeatTransfer.Data.Glasses.Generic

Information

This record implements thermophysical properties for window glas.

The table below compares the data of this record with the variables used in the WINDOW 5 output file.

Note that

• the surface a is usually the outside-facing surface, and the surface b is usually the room-facing surface.
• by the term solar, we mean the whole solar spectrum. Data in the solar spectrum are used for computing solar heat gains.
• by the term infrared (or infrared), we mean the infrared spectrum. Data in the infrared spectrum are used for thermal radiation that is emitted by surfaces that are around room or ambient temperature.
• WINDOW 5 uses spectral data in the calculation of optical properties of window systems, whereas the model in this library uses averages over the whole solar or infrared spectrum.

Buildings library variable name	WINDOW 5 variable name
tauSol	Tsol
rhoSol_a	Rsol1
rhoSol_b	Rsol2
tauIR	Tir
absIR_a	Abs1
absIR_b	Abs2

Extends from Modelica.Icons.Record (Icon for records).

Parameters

Type	Name	Default	Description
Length	x	0.003	Thickness [m]
ThermalConductivity	k	1	Thermal conductivity [W/(m.K)]
TransmissionCoefficient	tauSol	0.6	Solar transmittance [1]
ReflectionCoefficient	rhoSol_a	0.075	Solar reflectance of surface a (usually outside-facing surface) [1]
ReflectionCoefficient	rhoSol_b	0.075	Solar reflectance of surface b (usually room-facing surface) [1]
TransmissionCoefficient	tauIR	0	Infrared transmissivity of glass [1]
Emissivity	absIR_a	0.84	Infrared absorptivity of surface a (usually outside-facing surface) [1]
Emissivity	absIR_b	0.84	Infrared absorptivity of surface b (usually room-facing surface) [1]

Modelica definition

record Generic "Thermal properties of window glass"
    extends Modelica.Icons.Record;
 parameter Modelica.SIunits.Length x=0.003 "Thickness";
 parameter Modelica.SIunits.ThermalConductivity k=1 "Thermal conductivity";
 parameter Modelica.SIunits.TransmissionCoefficient tauSol = 0.6 
    "Solar transmittance";
 parameter Modelica.SIunits.ReflectionCoefficient rhoSol_a = 0.075 
    "Solar reflectance of surface a (usually outside-facing surface)";
 parameter Modelica.SIunits.ReflectionCoefficient rhoSol_b = 0.075 
    "Solar reflectance of surface b (usually room-facing surface)";
 parameter Modelica.SIunits.TransmissionCoefficient tauIR = 0 
    "Infrared transmissivity of glass";
 parameter Modelica.SIunits.Emissivity absIR_a = 0.84 
    "Infrared absorptivity of surface a (usually outside-facing surface)";
 parameter Modelica.SIunits.Emissivity absIR_b = 0.84 
    "Infrared absorptivity of surface b (usually room-facing surface)";
end Generic;

Buildings.HeatTransfer.Data.Glasses.ID100

Parameters

Type	Name	Default	Description
Length	x	0.0031	Thickness [m]
ThermalConductivity	k	1.0	Thermal conductivity [W/(m.K)]
TransmissionCoefficient	tauSol	0.646	Solar transmittance [1]
ReflectionCoefficient	rhoSol_a	0.062	Solar reflectance of surface a (usually outside-facing surface) [1]
ReflectionCoefficient	rhoSol_b	0.063	Solar reflectance of surface b (usually room-facing surface) [1]
TransmissionCoefficient	tauIR	0	Infrared transmissivity of glass [1]
Emissivity	absIR_a	0.84	Infrared absorptivity of surface a (usually outside-facing surface) [1]
Emissivity	absIR_b	0.84	Infrared absorptivity of surface b (usually room-facing surface) [1]

Modelica definition

record ID100 =   Buildings.HeatTransfer.Data.Glasses.Generic (
    x=0.0031,
    k=1.0,
    tauSol=0.646,
    rhoSol_a=0.062,
    rhoSol_b=0.063,
    tauIR=0,
    absIR_a=0.84,
    absIR_b=0.84) "Generic Bronze Glass 3.1mm. Manufacturer: Generic.";

Buildings.HeatTransfer.Data.Glasses.ID101

Parameters

Type	Name	Default	Description
Length	x	0.0057	Thickness [m]
ThermalConductivity	k	1.0	Thermal conductivity [W/(m.K)]
TransmissionCoefficient	tauSol	0.486	Solar transmittance [1]
ReflectionCoefficient	rhoSol_a	0.053	Solar reflectance of surface a (usually outside-facing surface) [1]
ReflectionCoefficient	rhoSol_b	0.053	Solar reflectance of surface b (usually room-facing surface) [1]
TransmissionCoefficient	tauIR	0	Infrared transmissivity of glass [1]
Emissivity	absIR_a	0.84	Infrared absorptivity of surface a (usually outside-facing surface) [1]
Emissivity	absIR_b	0.84	Infrared absorptivity of surface b (usually room-facing surface) [1]

Modelica definition

record ID101 =   Buildings.HeatTransfer.Data.Glasses.Generic (
    x=0.0057,
    k=1.0,
    tauSol=0.486,
    rhoSol_a=0.053,
    rhoSol_b=0.053,
    tauIR=0,
    absIR_a=0.84,
    absIR_b=0.84) "Generic Bronze Glass 5.7mm. Manufacturer: Generic.";

Buildings.HeatTransfer.Data.Glasses.ID102

Parameters

Type	Name	Default	Description
Length	x	0.003	Thickness [m]
ThermalConductivity	k	1.0	Thermal conductivity [W/(m.K)]
TransmissionCoefficient	tauSol	0.834	Solar transmittance [1]
ReflectionCoefficient	rhoSol_a	0.075	Solar reflectance of surface a (usually outside-facing surface) [1]
ReflectionCoefficient	rhoSol_b	0.075	Solar reflectance of surface b (usually room-facing surface) [1]
TransmissionCoefficient	tauIR	0	Infrared transmissivity of glass [1]
Emissivity	absIR_a	0.84	Infrared absorptivity of surface a (usually outside-facing surface) [1]
Emissivity	absIR_b	0.84	Infrared absorptivity of surface b (usually room-facing surface) [1]

Modelica definition

record ID102 =   Buildings.HeatTransfer.Data.Glasses.Generic (
    x=0.003,
    k=1.0,
    tauSol=0.834,
    rhoSol_a=0.075,
    rhoSol_b=0.075,
    tauIR=0,
    absIR_a=0.84,
    absIR_b=0.84) "Generic Clear Glass 3.048mm. Manufacturer: Generic.";

Buildings.HeatTransfer.Data.Glasses.ID103

Parameters

Type	Name	Default	Description
Length	x	0.0057	Thickness [m]
ThermalConductivity	k	1.0	Thermal conductivity [W/(m.K)]
TransmissionCoefficient	tauSol	0.771	Solar transmittance [1]
ReflectionCoefficient	rhoSol_a	0.070	Solar reflectance of surface a (usually outside-facing surface) [1]
ReflectionCoefficient	rhoSol_b	0.070	Solar reflectance of surface b (usually room-facing surface) [1]
TransmissionCoefficient	tauIR	0	Infrared transmissivity of glass [1]
Emissivity	absIR_a	0.84	Infrared absorptivity of surface a (usually outside-facing surface) [1]
Emissivity	absIR_b	0.84	Infrared absorptivity of surface b (usually room-facing surface) [1]

Modelica definition

record ID103 =   Buildings.HeatTransfer.Data.Glasses.Generic (
    x=0.0057,
    k=1.0,
    tauSol=0.771,
    rhoSol_a=0.070,
    rhoSol_b=0.070,
    tauIR=0,
    absIR_a=0.84,
    absIR_b=0.84) "Generic Clear Glass 5.7mm. Manufacturer: Generic.";