Collection of models that illustrate model use and test models
Information
This package contains examples for the use of models that can be found in
Buildings.Airflow.Multizone.BaseClasses.
Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).
Package Content
Test model for power law function
Information
This examples demonstrates the
Buildings.Airflow.Multizone.BaseClasses.powerLaw
function.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
| Type | Name | Default | Description |
|---|
| Real | k | 2/10^m | Flow coefficient, k = V_flow/ dp^m |
| Real | m | 0.5 | Flow exponent, m=0.5 for turbulent, m=1 for laminar |
| Pressure | dp_turbulent | 5 | Pressure difference where regularization starts [Pa] |
Modelica definition
model PowerLaw
"Test model for power law function"
extends Modelica.Icons.Example;
parameter Real k = 2/10^m
"Flow coefficient, k = V_flow/ dp^m";
parameter Real m(min=0.5, max=1) = 0.5
"Flow exponent, m=0.5 for turbulent, m=1 for laminar";
parameter Modelica.SIunits.Pressure dp_turbulent(min=0)=5
"Pressure difference where regularization starts";
Modelica.SIunits.Pressure dp
"Pressure difference";
Modelica.SIunits.VolumeFlowRate V_flow
"Volume flow rate";
equation
dp = 10*(-1+2*time);
V_flow =
Buildings.Airflow.Multizone.BaseClasses.powerLaw(dp=dp, k=k, m=m, dp_turbulent=dp_turbulent);
end PowerLaw;
Test model for power law function
Information
This examples demonstrates the
Buildings.Airflow.Multizone.BaseClasses.powerLaw
and
Buildings.Airflow.Multizone.BaseClasses.powerLawFixedM
functions.
They need to return the same function value.
This is verified by an assert statement.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
| Type | Name | Default | Description |
|---|
| Real | k | 2/10^m | Flow coefficient, k = V_flow/ dp^m |
| Pressure | dp_turbulent | 5 | Pressure difference where regularization starts [Pa] |
Modelica definition
model PowerLawFixedM
"Test model for power law function"
extends Modelica.Icons.Example;
parameter Real k = 2/10^m
"Flow coefficient, k = V_flow/ dp^m";
constant Real m(min=0.5, max=1) = 0.5
"Flow exponent, m=0.5 for turbulent, m=1 for laminar";
parameter Modelica.SIunits.Pressure dp_turbulent(min=0)=5
"Pressure difference where regularization starts";
Modelica.SIunits.Pressure dp
"Pressure difference";
Modelica.SIunits.VolumeFlowRate V_flow
"Volume flow rate computed with model powerLaw";
Modelica.SIunits.VolumeFlowRate VFixed_flow
"Volume flow rate computed with model powerLawFixed";
constant Real gamma(min=1) = 1.5
"Normalized flow rate where dphi(0)/dpi intersects phi(1)";
constant Real a = gamma
"Polynomial coefficient for regularized implementation of flow resistance";
constant Real b = 1/8*m^2 - 3*gamma - 3/2*m + 35.0/8
"Polynomial coefficient for regularized implementation of flow resistance";
constant Real c = -1/4*m^2 + 3*gamma + 5/2*m - 21.0/4
"Polynomial coefficient for regularized implementation of flow resistance";
constant Real d = 1/8*m^2 - gamma - m + 15.0/8
"Polynomial coefficient for regularized implementation of flow resistance";
equation
dp = 10*(-1+2*time);
V_flow =
Buildings.Airflow.Multizone.BaseClasses.powerLaw(dp=dp, k=k, m=m, dp_turbulent=dp_turbulent);
VFixed_flow =
Buildings.Airflow.Multizone.BaseClasses.powerLawFixedM(
k=k,
dp=dp,
m=m,
a=a,
b=b,
c=c,
d=d,
dp_turbulent=dp_turbulent);
assert(
abs(V_flow-VFixed_flow) < 1E-10, "Error: The two implementations of the power law model need to give identical results");
end PowerLawFixedM;
Test model for wind pressure function
Information
This examples demonstrates the
Buildings.Airflow.Multizone.BaseClasses.windPressureLowRise
function.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
| Type | Name | Default | Description |
|---|
| Real | Cp0 | 0.6 | Wind pressure coefficient for normal wind incidence angle |
| Real | G | Modelica.Math.log(0.5) | Natural logarithm of side ratio |
Modelica definition
model WindPressureLowRise
"Test model for wind pressure function"
extends Modelica.Icons.Example;
parameter Real Cp0 = 0.6
"Wind pressure coefficient for normal wind incidence angle";
Modelica.SIunits.Angle incAng
"Wind incidence angle (0: normal to wall)";
parameter Real G =
Modelica.Math.log(0.5)
"Natural logarithm of side ratio";
Real Cp
"Wind pressure coefficient";
equation
incAng=time*2*Modelica.Constants.pi;
Cp =
Buildings.Airflow.Multizone.BaseClasses.windPressureLowRise(Cp0=Cp0, G=G, incAng=incAng);
end WindPressureLowRise;
Automatically generated Thu Jun 19 10:54:24 2014.
PowerLaw
Buildings.Airflow.Multizone.BaseClasses.Examples.PowerLaw