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.Fluid.FMI.
Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).
Package Content
| Name |
Description |
 HeaterFan
|
Heater and fan in series, model configured to allow flow reversal |
| HeaterFanPressureDriven
|
Heater and fan in series, model configured to allow flow reversal and pressure driven flow rate |
| HeaterFan_noReverseFlow
|
Heater and fan in series, model configured to not allow flow reversal |
 FMUs
|
Collection of models that can be exported as FMUs |
Heater and fan in series, model configured to allow flow reversal
Information
This example demonstrates how to configure a model with a heater
and a fan that causes a pressure rise in the air stream.
Note that the mass flow rate and the absolute pressure are
set by the component sou.
Therefore, the fan simply increases the pressure of the medium,
and it also computes how much power is needed for this pressure rise,
which is an input to the fan model.
For a model with that computes the mass flow rate based on the pressure drop, see
Buildings.Fluid.FMI.Examples.HeaterFanPressureDriven.
For this example, the models are not exported as FMUs. However, the
thermofluid flow models are wrapped using input/output blocks.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
| Type | Name | Default | Description |
|---|
| MassFlowRate | m_flow_nominal | Q_flow_nominal/1000/10 | Nominal mass flow rate [kg/s] |
| Pressure | dp_nominal | 2000 | Pressure [Pa] |
| HeatFlowRate | Q_flow_nominal | 1000 | Heat flow rate at u=1, positive for heating [W] |
| Boolean | use_p_in | true | = true to use a pressure from connector, false to output Medium.p_default |
Modelica definition
model HeaterFan
"Heater and fan in series, model configured to allow flow reversal"
extends Modelica.Icons.Example;
package Medium =
Buildings.Media.Air "Medium model";
parameter Modelica.SIunits.MassFlowRate m_flow_nominal=Q_flow_nominal/1000/10
"Nominal mass flow rate";
parameter Modelica.SIunits.Pressure dp_nominal=2000
"Pressure";
parameter Modelica.SIunits.HeatFlowRate Q_flow_nominal = 1000
"Heat flow rate at u=1, positive for heating";
parameter Boolean use_p_in = true
"= true to use a pressure from connector, false to output Medium.p_default";
FMUs.Fan floMac(
redeclare final package Medium = Medium,
m_flow_nominal=m_flow_nominal,
dp_nominal=dp_nominal,
use_p_in=use_p_in)
"Flow machine with pressure raise as an input";
FMUs.HeaterCooler_u hea(
redeclare final package Medium = Medium,
m_flow_nominal=m_flow_nominal,
dp_nominal=dp_nominal,
Q_flow_nominal=Q_flow_nominal,
use_p_in=use_p_in)
"Heater";
Modelica.Blocks.Sources.Constant dp(k=dp_nominal)
"Pressure raise of fan";
Modelica.Blocks.Sources.Constant uHea(k=0.2)
"Control signal for heater";
Source_T sou(
redeclare package Medium = Medium, use_p_in=use_p_in)
"Source for mass flow rate and pressure";
Sink_T sin(
redeclare package Medium = Medium, use_p_in=use_p_in)
"Sink for flow rate, and source for backflow properties";
Modelica.Blocks.Sources.Constant m_flow(k=m_flow_nominal)
"Mass flow rate";
Modelica.Blocks.Sources.Constant pIn(k=100000)
"Inlet pressure";
Modelica.Blocks.Sources.Constant TIn(k=293.15)
"Inlet temperature";
Modelica.Blocks.Sources.Constant X_w_in(k=0.01)
"Inlet mass fraction";
Modelica.Blocks.Sources.Constant TBac(k=303.15)
"Temperature of backward flow";
Modelica.Blocks.Sources.Constant X_w_bac(k=0.015)
"Moisture mass fraction for back flow";
Modelica.Blocks.Sources.Constant CBac[Medium.nC](
each k=0.01)
if
Medium.nC > 0
"Trace substances for back flow";
Modelica.Blocks.Sources.Constant C[Medium.nC](
each k=0.01)
if
Medium.nC > 0
"Trace substances for forward flow";
equation
connect(uHea.y, hea.u);
connect(dp.y, floMac.dp_in);
connect(sou.outlet, hea.inlet);
connect(hea.outlet, floMac.inlet);
connect(sin.inlet, floMac.outlet);
connect(sin.T_in, TBac.y);
connect(CBac.y, sin.C_in);
connect(m_flow.y, sou.m_flow_in);
connect(sou.p_in, pIn.y);
connect(TIn.y, sou.T_in);
connect(C.y, sou.C_in);
connect(X_w_in.y, sou.X_w_in);
connect(sin.X_w_in, X_w_bac.y);
end HeaterFan;
Heater and fan in series, model configured to allow flow reversal and pressure driven flow rate
Information
This example demonstrates how to configure a model with a heater
and a fan that causes a pressure rise in the air stream.
The fan increases the pressure of the medium,
and it also computes how much power is needed for this pressure rise,
which is an input to the fan model.
The component invBloCon at the bottom of the model sets up
an equality constraint on the pressure between the sink and the source.
It also outputs a signal for the mass flow rate. Hence, this component is
used to declare how to break the algebraic loop in this signal flow diagram.
For a model with prescribed mass flow rate, see
Buildings.Fluid.FMI.Examples.HeaterFan.
For this example, the models are not exported as FMUs. However, the
thermofluid flow models are wrapped using input/output blocks.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
| Type | Name | Default | Description |
|---|
| MassFlowRate | m_flow_nominal | Q_flow_nominal/1000/10 | Nominal mass flow rate [kg/s] |
| Pressure | dp_nominal | 2000 | Pressure [Pa] |
| HeatFlowRate | Q_flow_nominal | 1000 | Heat flow rate at u=1, positive for heating [W] |
Modelica definition
model HeaterFanPressureDriven
"Heater and fan in series, model configured to allow flow reversal and pressure driven flow rate"
extends Modelica.Icons.Example;
package Medium =
Buildings.Media.Air "Medium model";
parameter Modelica.SIunits.MassFlowRate m_flow_nominal=Q_flow_nominal/1000/10
"Nominal mass flow rate";
parameter Modelica.SIunits.Pressure dp_nominal=2000
"Pressure";
parameter Modelica.SIunits.HeatFlowRate Q_flow_nominal = 1000
"Heat flow rate at u=1, positive for heating";
constant Boolean use_p_in = true
"Set to true, as this model computes the mass flow rate based on the pressure drop";
FMUs.Fan floMac(
m_flow_nominal=m_flow_nominal,
dp_nominal=dp_nominal,
use_p_in=use_p_in)
"Flow machine with pressure raise as an input";
FMUs.HeaterCooler_u hea(
m_flow_nominal=m_flow_nominal,
dp_nominal=dp_nominal,
Q_flow_nominal=Q_flow_nominal,
use_p_in=use_p_in)
"Heater";
Modelica.Blocks.Sources.Constant dp(k=dp_nominal)
"Pressure raise of fan";
Modelica.Blocks.Sources.Constant uHea(k=0.2)
"Control signal for heater";
Source_T sou(
redeclare package Medium = Medium, use_p_in=use_p_in)
"Source for mass flow rate and pressure";
Sink_T sin(
redeclare package Medium = Medium, use_p_in=use_p_in)
"Sink for flow rate, and source for backflow properties";
Modelica.Blocks.Sources.Constant m_flow(k=m_flow_nominal)
"Mass flow rate";
Modelica.Blocks.Sources.Constant pIn(k=100000)
"Inlet pressure";
Modelica.Blocks.Sources.Constant TIn(k=293.15)
"Inlet temperature";
Modelica.Blocks.Sources.Constant X_w_in(k=0.01)
"Inlet mass fraction";
Modelica.Blocks.Sources.Constant TBac(k=303.15)
"Temperature of backward flow";
Modelica.Blocks.Sources.Constant X_w_bac(k=0.015)
"Moisture mass fraction for back flow";
Modelica.Blocks.Sources.Constant CBac[Medium.nC](
each k=0.01)
if
Medium.nC > 0
"Trace substances for back flow";
Modelica.Blocks.Sources.Constant C[Medium.nC](
each k=0.01)
if
Medium.nC > 0
"Trace substances for forward flow";
Modelica.Blocks.Math.InverseBlockConstraints invBloCon
"Block to set up residual function for nonlinear system of equation for pressure drop and mass flow rate";
equation
connect(uHea.y, hea.u);
connect(dp.y, floMac.dp_in);
connect(sou.outlet, hea.inlet);
connect(hea.outlet, floMac.inlet);
connect(sin.inlet, floMac.outlet);
connect(sin.T_in, TBac.y);
connect(CBac.y, sin.C_in);
connect(sou.p_in, pIn.y);
connect(TIn.y, sou.T_in);
connect(C.y, sou.C_in);
connect(pIn.y, invBloCon.u1);
connect(sin.p, invBloCon.u2);
connect(invBloCon.y1, sou.m_flow_in);
connect(X_w_in.y, sou.X_w_in);
connect(X_w_bac.y, sin.X_w_in);
end HeaterFanPressureDriven;
Heater and fan in series, model configured to not allow flow reversal
Information
This example demonstrates how to configure a model with a heater
and a fan that causes a pressure rise in the air stream.
The model is identical with
Buildings.Fluid.FMI.Examples.HeaterFan
except that reverse flow is not allowed due to the parameter
allowFlowReversal=false.
Consequently, the connectors for the fluid properties for the reverse flow
are removed, and the blocks on the right hand side of the model
Buildings.Fluid.FMI.Examples.HeaterFan
have been deleted.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
| Type | Name | Default | Description |
|---|
| Boolean | use_p_in | false | = true to use a pressure from connector, false to output Medium.p_default |
| MassFlowRate | m_flow_nominal | Q_flow_nominal/1000/10 | Nominal mass flow rate [kg/s] |
| Pressure | dp_nominal | 2000 | Pressure [Pa] |
| HeatFlowRate | Q_flow_nominal | 1000 | Heat flow rate at u=1, positive for heating [W] |
Modelica definition
model HeaterFan_noReverseFlow
"Heater and fan in series, model configured to not allow flow reversal"
extends Modelica.Icons.Example;
package Medium =
Buildings.Media.Air "Medium model";
final parameter Boolean allowFlowReversal = false
"= true to allow flow reversal, false restricts to design direction (inlet -> outlet)";
parameter Boolean use_p_in = false
"= true to use a pressure from connector, false to output Medium.p_default";
parameter Modelica.SIunits.MassFlowRate m_flow_nominal=Q_flow_nominal/1000/10
"Nominal mass flow rate";
parameter Modelica.SIunits.Pressure dp_nominal=2000
"Pressure";
parameter Modelica.SIunits.HeatFlowRate Q_flow_nominal = 1000
"Heat flow rate at u=1, positive for heating";
FMUs.Fan floMac(
redeclare final package Medium = Medium,
m_flow_nominal=m_flow_nominal,
dp_nominal=dp_nominal,
final allowFlowReversal=allowFlowReversal,
use_p_in=use_p_in)
"Flow machine with pressure raise as an input";
FMUs.HeaterCooler_u hea(
redeclare final package Medium = Medium,
m_flow_nominal=m_flow_nominal,
dp_nominal=dp_nominal,
Q_flow_nominal=Q_flow_nominal,
final allowFlowReversal=allowFlowReversal,
use_p_in=use_p_in)
"Heater";
Modelica.Blocks.Sources.Constant dp(k=1000)
"Pressure raise of fan";
Modelica.Blocks.Sources.Constant uHea(k=0.2)
"Control signal for heater";
Source_T sou(
redeclare package Medium = Medium,
final allowFlowReversal=allowFlowReversal,
use_p_in=use_p_in)
"Source for mass flow rate and pressure";
Modelica.Blocks.Sources.Constant m_flow(k=m_flow_nominal)
"Mass flow rate";
Modelica.Blocks.Sources.Constant pIn(k=100000)
"Inlet pressure";
Modelica.Blocks.Sources.Constant TIn(k=293.15)
"Inlet temperature";
Modelica.Blocks.Sources.Constant X_w_in(k=0.01)
"Inlet mass fraction";
Modelica.Blocks.Sources.Constant C[Medium.nC](
each k=0.01)
if
Medium.nC > 0
"Trace substances for forward flow";
equation
connect(uHea.y, hea.u);
connect(dp.y, floMac.dp_in);
connect(sou.outlet, hea.inlet);
connect(hea.outlet, floMac.inlet);
connect(m_flow.y, sou.m_flow_in);
connect(sou.p_in, pIn.y);
connect(TIn.y, sou.T_in);
connect(C.y, sou.C_in);
connect(X_w_in.y, sou.X_w_in);
end HeaterFan_noReverseFlow;
Automatically generated Mon Jul 13 14:24:18 2015.
Buildings.Fluid.FMI.Examples.HeaterFan