Buildings.HeatTransfer.Data.Gases

Information

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

Package Content

Name	Description
Generic	Thermal properties of fill gas for windows
Air	Thermophysical properties for air
Argon	Thermophysical properties for argon
Krypton	Thermophysical properties for krypton
Xenon	Thermophysical properties for krypton
thermalConductivity	Function to compute the thermal conductivity of gases
density	Function to compute the mass density
dynamicViscosity	Function to compute the dynamic viscosity for gases
specificHeatCapacity	Function to compute the specific heat capacity for gases

Buildings.HeatTransfer.Data.Gases.Generic

Information

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

Parameters

Type	Name	Default	Description
Length	x		Gas layer thickness [m]
ThermalConductivity	a_k		Constant coefficient for thermal conductivity [W/(m.K)]
Real	b_k		Temperature dependent coefficient for thermal conductivity [W/(m.K2)]
DynamicViscosity	a_mu		Constant coefficient for dynamic viscosity [Pa.s]
Real	b_mu		Temperature dependent coefficient for dynamic viscosity [N.s/(m2.K)]
SpecificHeatCapacity	a_c		Constant coefficient for specific heat capacity [J/(kg.K)]
Real	b_c		Temperature dependent coefficient for specific heat capacity [J/(kg.K2)]
MolarMass	MM		Molar mass (of mixture or single fluid) [kg/mol]

Modelica definition

record Generic "Thermal properties of fill gas for windows"
    extends Modelica.Icons.Record;
    parameter Modelica.SIunits.Length x "Gas layer thickness";
    parameter Modelica.SIunits.ThermalConductivity a_k 
    "Constant coefficient for thermal conductivity";
    parameter Real b_k(unit="W/(m.K2)") 
    "Temperature dependent coefficient for thermal conductivity";
    parameter Modelica.SIunits.DynamicViscosity a_mu 
    "Constant coefficient for dynamic viscosity";
    parameter Real b_mu(unit="N.s/(m2.K)") 
    "Temperature dependent coefficient for dynamic viscosity";
    parameter Modelica.SIunits.SpecificHeatCapacity a_c 
    "Constant coefficient for specific heat capacity";
    parameter Real b_c(unit="J/(kg.K2)") 
    "Temperature dependent coefficient for specific heat capacity";

    parameter Modelica.SIunits.MolarMass MM 
    "Molar mass (of mixture or single fluid)";

    constant Modelica.SIunits.Pressure P0 = 101325 "Normal pressure";

end Generic;

Buildings.HeatTransfer.Data.Gases.Air

Parameters

Type	Name	Default	Description
Length	x		Gas layer thickness [m]
ThermalConductivity	a_k	2.873E-3	Constant coefficient for thermal conductivity [W/(m.K)]
Real	b_k	7.760E-5	Temperature dependent coefficient for thermal conductivity [W/(m.K2)]
DynamicViscosity	a_mu	3.723E-6	Constant coefficient for dynamic viscosity [Pa.s]
Real	b_mu	4.940E-8	Temperature dependent coefficient for dynamic viscosity [N.s/(m2.K)]
SpecificHeatCapacity	a_c	1002.737	Constant coefficient for specific heat capacity [J/(kg.K)]
Real	b_c	1.2324E-2	Temperature dependent coefficient for specific heat capacity [J/(kg.K2)]
MolarMass	MM	28.97E-3	Molar mass (of mixture or single fluid) [kg/mol]

Modelica definition

record Air = Generic(a_k= 2.873E-3, b_k= 7.760E-5,
                     a_mu=3.723E-6, b_mu=4.940E-8,
                     a_c=1002.737,  b_c= 1.2324E-2,
                     MM=28.97E-3) "Thermophysical properties for air";

Buildings.HeatTransfer.Data.Gases.Argon

Parameters

Type	Name	Default	Description
Length	x		Gas layer thickness [m]
ThermalConductivity	a_k	2.285E-3	Constant coefficient for thermal conductivity [W/(m.K)]
Real	b_k	5.149E-5	Temperature dependent coefficient for thermal conductivity [W/(m.K2)]
DynamicViscosity	a_mu	3.379E-6	Constant coefficient for dynamic viscosity [Pa.s]
Real	b_mu	6.451E-8	Temperature dependent coefficient for dynamic viscosity [N.s/(m2.K)]
SpecificHeatCapacity	a_c	521.9285	Constant coefficient for specific heat capacity [J/(kg.K)]
Real	b_c	0	Temperature dependent coefficient for specific heat capacity [J/(kg.K2)]
MolarMass	MM	39.948E-3	Molar mass (of mixture or single fluid) [kg/mol]

Modelica definition

record Argon = Generic(a_k= 2.285E-3, b_k= 5.149E-5,
                       a_mu=3.379E-6, b_mu=6.451E-8,
                       a_c=521.9285,  b_c= 0,
                       MM=39.948E-3) "Thermophysical properties for argon";

Buildings.HeatTransfer.Data.Gases.Krypton

Parameters

Type	Name	Default	Description
Length	x		Gas layer thickness [m]
ThermalConductivity	a_k	9.443E-4	Constant coefficient for thermal conductivity [W/(m.K)]
Real	b_k	2.826E-5	Temperature dependent coefficient for thermal conductivity [W/(m.K2)]
DynamicViscosity	a_mu	2.213E-6	Constant coefficient for dynamic viscosity [Pa.s]
Real	b_mu	7.777E-8	Temperature dependent coefficient for dynamic viscosity [N.s/(m2.K)]
SpecificHeatCapacity	a_c	248.0907	Constant coefficient for specific heat capacity [J/(kg.K)]
Real	b_c	0	Temperature dependent coefficient for specific heat capacity [J/(kg.K2)]
MolarMass	MM	83.80E-3	Molar mass (of mixture or single fluid) [kg/mol]

Modelica definition

record Krypton = Generic(a_k= 9.443E-4, b_k= 2.826E-5,
                         a_mu=2.213E-6, b_mu=7.777E-8,
                         a_c=248.0907,  b_c= 0,
                         MM=83.80E-3) "Thermophysical properties for krypton";

Buildings.HeatTransfer.Data.Gases.Xenon

Parameters

Type	Name	Default	Description
Length	x		Gas layer thickness [m]
ThermalConductivity	a_k	4.538E-4	Constant coefficient for thermal conductivity [W/(m.K)]
Real	b_k	1.723E-5	Temperature dependent coefficient for thermal conductivity [W/(m.K2)]
DynamicViscosity	a_mu	1.069E-6	Constant coefficient for dynamic viscosity [Pa.s]
Real	b_mu	7.414E-8	Temperature dependent coefficient for dynamic viscosity [N.s/(m2.K)]
SpecificHeatCapacity	a_c	158.3397	Constant coefficient for specific heat capacity [J/(kg.K)]
Real	b_c	0	Temperature dependent coefficient for specific heat capacity [J/(kg.K2)]
MolarMass	MM	131.3E-3	Molar mass (of mixture or single fluid) [kg/mol]

Modelica definition

record Xenon = Generic(a_k= 4.538E-4, b_k= 1.723E-5,
                       a_mu=1.069E-6, b_mu=7.414E-8,
                       a_c=158.3397,  b_c= 0,
                       MM=131.3E-3) "Thermophysical properties for krypton";

Buildings.HeatTransfer.Data.Gases.thermalConductivity

Inputs

Type	Name	Default	Description
Generic	gas		Record of gas data
Temperature	T		Gas temperature [K]

Outputs

Type	Name	Description
ThermalConductivity	k	Thermal conductivity [W/(m.K)]

Modelica definition

function thermalConductivity 
  "Function to compute the thermal conductivity of gases"
 input Buildings.HeatTransfer.Data.Gases.Generic gas "Record of gas data";
 input Modelica.SIunits.Temperature T "Gas temperature";
 output Modelica.SIunits.ThermalConductivity k "Thermal conductivity";
algorithm 
 k := gas.a_k + gas.b_k*T;
end thermalConductivity;

Buildings.HeatTransfer.Data.Gases.density

Inputs

Type	Name	Default	Description
Generic	gas		Record of gas data
Temperature	T		Gas temperature [K]

Outputs

Type	Name	Description
Density	rho	Mass density [kg/m3]

Modelica definition

function density "Function to compute the mass density"
  input Buildings.HeatTransfer.Data.Gases.Generic gas "Record of gas data";
  input Modelica.SIunits.Temperature T "Gas temperature";
  output Modelica.SIunits.Density rho "Mass density";
algorithm 
    rho := gas.P0*gas.MM/Modelica.Constants.R/T;
end density;

Buildings.HeatTransfer.Data.Gases.dynamicViscosity

Inputs

Type	Name	Default	Description
Generic	gas		Record of gas data
Temperature	T		Gas temperature [K]

Outputs

Type	Name	Description
DynamicViscosity	mu	Dynamic viscosity [Pa.s]

Modelica definition

function dynamicViscosity 
  "Function to compute the dynamic viscosity for gases"
  input Buildings.HeatTransfer.Data.Gases.Generic gas "Record of gas data";
  input Modelica.SIunits.Temperature T "Gas temperature";
  output Modelica.SIunits.DynamicViscosity mu "Dynamic viscosity";
algorithm 
    mu := gas.a_mu + gas.b_mu*T;
end dynamicViscosity;

Buildings.HeatTransfer.Data.Gases.specificHeatCapacity

Inputs

Type	Name	Default	Description
Generic	gas		Record of gas data
Temperature	T		Gas temperature [K]

Outputs

Type	Name	Description
SpecificHeatCapacity	c_p	Specific heat capacity [J/(kg.K)]

Modelica definition

function specificHeatCapacity 
  "Function to compute the specific heat capacity for gases"
  input Buildings.HeatTransfer.Data.Gases.Generic gas "Record of gas data";
  input Modelica.SIunits.Temperature T "Gas temperature";
  output Modelica.SIunits.SpecificHeatCapacity c_p "Specific heat capacity";
algorithm 
  c_p := gas.a_c + gas.b_c*T;
end specificHeatCapacity;