Buildings.Obsolete.Fluid.Sources
Package with boundary condition models
Information
Package Sources contains generic sources for fluid connectors to define fixed or prescribed ambient conditions.
Extends from Modelica.Icons.SourcesPackage (Icon for packages containing sources).
Package Content
| Name | Description |
|---|---|
 FixedBoundary
|
Boundary source component |
Buildings.Obsolete.Fluid.Sources.FixedBoundary
Boundary source component
Information
This model defines constant values for boundary conditions:
- Boundary pressure or boundary density.
- Boundary temperature or boundary specific enthalpy.
- Boundary composition (only for multi-substance or trace-substance flow).
Note, that boundary temperature, density, specific enthalpy, mass fractions and trace substances have only an effect if the mass flow is from the Boundary into the port. If mass is flowing from the port into the boundary, the boundary definitions, with exception of boundary pressure, do not have an effect.
Extends from Buildings.Obsolete.BaseClasses.ObsoleteModel (Icon for classes that are obsolete and will be removed in later versions), Buildings.Fluid.Sources.BaseClasses.PartialSource (Partial component source with one fluid connector).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package Medium | PartialMedium | Medium in the component | |
| Boundary pressure or Boundary density | |||
| Boolean | use_p | true | select p or d |
| AbsolutePressure | p | Medium.p_default | Boundary pressure [Pa] |
| Density | d | Medium.density_pTX(p=Medium.... | Boundary density [kg/m3] |
| Boundary temperature or Boundary specific enthalpy | |||
| Boolean | use_T | true | select T or h |
| Temperature | T | Medium.T_default | Boundary temperature [K] |
| SpecificEnthalpy | h | Medium.h_default | Boundary specific enthalpy [J/kg] |
| Only for multi-substance flow | |||
| MassFraction | X[Medium.nX] | Medium.X_default | Boundary mass fractions m_i/m [kg/kg] |
| Only for trace-substance flow | |||
| ExtraProperty | C[Medium.nC] | fill(0, Medium.nC) | Boundary trace substances |
| Advanced | |||
| Boolean | verifyInputs | true | Set to true to stop the simulation with an error if the medium temperature is outside its allowable range |
Connectors
| Type | Name | Description |
|---|---|---|
| FluidPorts_b | ports[nPorts] |
Modelica definition
model FixedBoundary "Boundary source component"
extends Buildings.Obsolete.BaseClasses.ObsoleteModel;
extends Buildings.Fluid.Sources.BaseClasses.PartialSource(final verifyInputs=true);
parameter Boolean use_p=true "select p or d";
parameter Medium.AbsolutePressure p=Medium.p_default "Boundary pressure";
parameter Medium.Density d=Medium.density_pTX(
p = Medium.p_default,
T = Medium.T_default,
X = Medium.X_default) "Boundary density";
parameter Boolean use_T=true "select T or h";
parameter Medium.Temperature T=Medium.T_default "Boundary temperature";
parameter Medium.SpecificEnthalpy h=Medium.h_default
"Boundary specific enthalpy";
parameter Medium.MassFraction X[Medium.nX](
final quantity=Medium.substanceNames) = Medium.X_default
"Boundary mass fractions m_i/m";
parameter Medium.ExtraProperty C[Medium.nC](
final quantity=Medium.extraPropertiesNames)=fill(0, Medium.nC)
"Boundary trace substances";
protected
Modelica.Blocks.Interfaces.RealInput T_in_internal(final unit="K",
displayUnit="degC")
"Needed to connect to conditional connector";
Modelica.Blocks.Interfaces.RealInput p_in_internal(final unit="Pa")
"Needed to connect to conditional connector";
Modelica.Blocks.Interfaces.RealInput h_in(final unit="J/kg")
"Needed to connect to conditional connector";
Modelica.Blocks.Interfaces.RealInput h_in_internal= Medium.specificEnthalpy(Medium.setState_pTX(p_in_internal, T_in_internal, X_in_internal));
// Modelica.Blocks.Interfaces.RealInput d_in_internal = Medium.density(Medium.setState_pTX(p_in_internal, T_in_internal, X_in_internal));
initial equation
Modelica.Fluid.Utilities.checkBoundary(Medium.mediumName, Medium.substanceNames,
Medium.singleState, use_p, X,
"FixedBoundary");
equation
h_in = h;
if use_p or Medium.singleState then
p_in_internal = p;
connect(medium.p, p_in_internal);
else
p_in_internal = Medium.p_default;
connect(medium.p, p_in_internal);
end if;
if use_T then
T_in_internal = T;
connect(medium.h, h_in_internal);
else
T_in_internal = Medium.T_default;
connect(medium.h, h_in);
end if;
X_in_internal = X;
connect(X_in_internal[1:Medium.nXi], Xi_in_internal);
connect(medium.Xi, Xi_in_internal);
ports.C_outflow = fill(C, nPorts);
C_in_internal = C;
if not verifyInputs then
h_in_internal = Medium.h_default;
p_in_internal = Medium.p_default;
X_in_internal = Medium.X_default;
T_in_internal = Medium.T_default;
end if;
for i in 1:nPorts loop
ports[i].p = p_in_internal;
ports[i].h_outflow = h_in_internal;
ports[i].Xi_outflow = Xi_in_internal;
end for;
end FixedBoundary;