Buildings.HeatTransfer.Data.Glasses

Information

Since the long-wave 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.

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 short-wave, we mean the whole solar spectrum. Data in the short-wave spectrum are used for computing solar heat gains.
• by the term long-wave (or infrared), we mean the infrared spectrum. Data in the long-wave 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
tauSW	Tsol
rhoSW_a	Rsol1
rhoSW_b	Rsol2
tauLW	Tir
epsLW_a	Emis1
epsLW_b	Emis2

Extends from Modelica.Icons.Record (Icon for a record).

Parameters

Type	Name	Default	Description
Length	x	0.003	Thickness [m]
ThermalConductivity	k	1	Thermal conductivity [W/(m.K)]
TransmissionCoefficient	tauSW	0.6	Solar transmittance [1]
ReflectionCoefficient	rhoSW_a	0.075	Solar reflectance of surface a (usually outside-facing surface) [1]
ReflectionCoefficient	rhoSW_b	0.075	Solar reflectance of surface b (usually room-facing surface) [1]
TransmissionCoefficient	tauLW	0	Long-wave transmissivity of glass [1]
Emissivity	epsLW_a	0.84	Long-wave emissivity of surface a (usually outside-facing surface) [1]
Emissivity	epsLW_b	0.84	Long-wave emissivity 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 tauSW = 0.6 
    "Solar transmittance";
 parameter Modelica.SIunits.ReflectionCoefficient rhoSW_a = 0.075 
    "Solar reflectance of surface a (usually outside-facing surface)";
 parameter Modelica.SIunits.ReflectionCoefficient rhoSW_b = 0.075 
    "Solar reflectance of surface b (usually room-facing surface)";
 parameter Modelica.SIunits.TransmissionCoefficient tauLW = 0 
    "Long-wave transmissivity of glass";
 parameter Modelica.SIunits.Emissivity epsLW_a = 0.84 
    "Long-wave emissivity of surface a (usually outside-facing surface)";
 parameter Modelica.SIunits.Emissivity epsLW_b = 0.84 
    "Long-wave emissivity 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	tauSW	0.646	Solar transmittance [1]
ReflectionCoefficient	rhoSW_a	0.062	Solar reflectance of surface a (usually outside-facing surface) [1]
ReflectionCoefficient	rhoSW_b	0.063	Solar reflectance of surface b (usually room-facing surface) [1]
TransmissionCoefficient	tauLW	0	Long-wave transmissivity of glass [1]
Emissivity	epsLW_a	0.84	Long-wave emissivity of surface a (usually outside-facing surface) [1]
Emissivity	epsLW_b	0.84	Long-wave emissivity of surface b (usually room-facing surface) [1]

Modelica definition

record ID100 =   Buildings.HeatTransfer.Data.Glasses.Generic (
    x=0.0031,
    k=1.0,
    tauSW=0.646,
    rhoSW_a=0.062,
    rhoSW_b=0.063,
    tauLW=0,
    epsLW_a=0.84,
    epsLW_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	tauSW	0.486	Solar transmittance [1]
ReflectionCoefficient	rhoSW_a	0.053	Solar reflectance of surface a (usually outside-facing surface) [1]
ReflectionCoefficient	rhoSW_b	0.053	Solar reflectance of surface b (usually room-facing surface) [1]
TransmissionCoefficient	tauLW	0	Long-wave transmissivity of glass [1]
Emissivity	epsLW_a	0.84	Long-wave emissivity of surface a (usually outside-facing surface) [1]
Emissivity	epsLW_b	0.84	Long-wave emissivity of surface b (usually room-facing surface) [1]

Modelica definition

record ID101 =   Buildings.HeatTransfer.Data.Glasses.Generic (
    x=0.0057,
    k=1.0,
    tauSW=0.486,
    rhoSW_a=0.053,
    rhoSW_b=0.053,
    tauLW=0,
    epsLW_a=0.84,
    epsLW_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	tauSW	0.834	Solar transmittance [1]
ReflectionCoefficient	rhoSW_a	0.075	Solar reflectance of surface a (usually outside-facing surface) [1]
ReflectionCoefficient	rhoSW_b	0.075	Solar reflectance of surface b (usually room-facing surface) [1]
TransmissionCoefficient	tauLW	0	Long-wave transmissivity of glass [1]
Emissivity	epsLW_a	0.84	Long-wave emissivity of surface a (usually outside-facing surface) [1]
Emissivity	epsLW_b	0.84	Long-wave emissivity of surface b (usually room-facing surface) [1]

Modelica definition

record ID102 =   Buildings.HeatTransfer.Data.Glasses.Generic (
    x=0.003,
    k=1.0,
    tauSW=0.834,
    rhoSW_a=0.075,
    rhoSW_b=0.075,
    tauLW=0,
    epsLW_a=0.84,
    epsLW_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	tauSW	0.771	Solar transmittance [1]
ReflectionCoefficient	rhoSW_a	0.070	Solar reflectance of surface a (usually outside-facing surface) [1]
ReflectionCoefficient	rhoSW_b	0.070	Solar reflectance of surface b (usually room-facing surface) [1]
TransmissionCoefficient	tauLW	0	Long-wave transmissivity of glass [1]
Emissivity	epsLW_a	0.84	Long-wave emissivity of surface a (usually outside-facing surface) [1]
Emissivity	epsLW_b	0.84	Long-wave emissivity of surface b (usually room-facing surface) [1]

Modelica definition

record ID103 =   Buildings.HeatTransfer.Data.Glasses.Generic (
    x=0.0057,
    k=1.0,
    tauSW=0.771,
    rhoSW_a=0.070,
    rhoSW_b=0.070,
    tauLW=0,
    epsLW_a=0.84,
    epsLW_b=0.84) "Generic Clear Glass 5.7mm. Manufacturer: Generic.";