Modelica.Thermal.HeatTransfer.Interfaces

Information

Extends from Modelica.Icons.InterfacesPackage (Icon for packages containing interfaces).

Package Content

Name	Description
HeatPort	Thermal port for 1-dim. heat transfer
HeatPort_a	Thermal port for 1-dim. heat transfer (filled rectangular icon)
HeatPort_b	Thermal port for 1-dim. heat transfer (unfilled rectangular icon)
Element1D	Partial heat transfer element with two HeatPort connectors that does not store energy
PartialElementaryConditionalHeatPort	Partial model to include a conditional HeatPort in order to dissipate losses, used for textual modeling, i.e., for elementary models
PartialElementaryConditionalHeatPortWithoutT	Partial model to include a conditional HeatPort in order to dissipate losses, used for textual modeling, i.e., for elementary models
PartialConditionalHeatPort	Partial model to include a conditional HeatPort in order to dissipate losses, used for graphical modeling, i.e., for bulding modelsby drag-and-drop

Modelica.Thermal.HeatTransfer.Interfaces.HeatPort

Information

Contents

Type	Name	Description
Temperature	T	Port temperature [K]
flow HeatFlowRate	Q_flow	Heat flow rate (positive if flowing from outside into the component) [W]

Modelica definition

partial connector HeatPort "Thermal port for 1-dim. heat transfer"
  Modelica.SIunits.Temperature T "Port temperature";
  flow Modelica.SIunits.HeatFlowRate Q_flow 
    "Heat flow rate (positive if flowing from outside into the component)";
end HeatPort;

Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a

Information

This connector is used for 1-dimensional heat flow between components. The variables in the connector are:

   T       Temperature in [Kelvin].
   Q_flow  Heat flow rate in [Watt].

According to the Modelica sign convention, a positive heat flow rate Q_flow is considered to flow into a component. This convention has to be used whenever this connector is used in a model class.

Note, that the two connector classes HeatPort_a and HeatPort_b are identical with the only exception of the different icon layout.

Extends from HeatPort (Thermal port for 1-dim. heat transfer).

Contents

Type	Name	Description
Temperature	T	Port temperature [K]
flow HeatFlowRate	Q_flow	Heat flow rate (positive if flowing from outside into the component) [W]

Modelica definition

connector HeatPort_a 
  "Thermal port for 1-dim. heat transfer (filled rectangular icon)"

  extends HeatPort;

end HeatPort_a;

Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_b

Information

This connector is used for 1-dimensional heat flow between components. The variables in the connector are:

   T       Temperature in [Kelvin].
   Q_flow  Heat flow rate in [Watt].

According to the Modelica sign convention, a positive heat flow rate Q_flow is considered to flow into a component. This convention has to be used whenever this connector is used in a model class.

Note, that the two connector classes HeatPort_a and HeatPort_b are identical with the only exception of the different icon layout.

Extends from HeatPort (Thermal port for 1-dim. heat transfer).

Contents

Type	Name	Description
Temperature	T	Port temperature [K]
flow HeatFlowRate	Q_flow	Heat flow rate (positive if flowing from outside into the component) [W]

Modelica definition

connector HeatPort_b 
  "Thermal port for 1-dim. heat transfer (unfilled rectangular icon)"

  extends HeatPort;

end HeatPort_b;

Modelica.Thermal.HeatTransfer.Interfaces.Element1D

Information

This partial model contains the basic connectors and variables to allow heat transfer models to be created that do not store energy, This model defines and includes equations for the temperature drop across the element, dT, and the heat flow rate through the element from port_a to port_b, Q_flow.

By extending this model, it is possible to write simple constitutive equations for many types of heat transfer components.

Connectors

Type	Name	Description
HeatPort_a	port_a
HeatPort_b	port_b

Modelica definition

partial model Element1D 
  "Partial heat transfer element with two HeatPort connectors that does not store energy"

  Modelica.SIunits.HeatFlowRate Q_flow "Heat flow rate from port_a -> port_b";
  Modelica.SIunits.TemperatureDifference dT "port_a.T - port_b.T";
public 
  HeatPort_a port_a;
  HeatPort_b port_b;
equation 
  dT = port_a.T - port_b.T;
  port_a.Q_flow = Q_flow;
  port_b.Q_flow = -Q_flow;
end Element1D;

Modelica.Thermal.HeatTransfer.Interfaces.PartialElementaryConditionalHeatPort

Information

This partial model provides a conditional heat port for dissipating losses.

• If useHeatPort is set to false (default), no heat port is available, and the thermal loss power is dissipated internally. In this case, the parameter T specifies the fixed device temperature (the default for T = 20°C)
• If useHeatPort is set to true, the heat port is available.

If this model is used, the loss power has to be provided by an equation in the model which inherits from PartialElementaryConditionalHeatPort model (lossPower = ...). The device temperature TheatPort can be used to describe the influence of the device temperature on the model behaviour.

Parameters

Type	Name	Default	Description
Boolean	useHeatPort	false	=true, if heatPort is enabled
Temperature	T	293.15	Fixed device temperature if useHeatPort = false [K]

Connectors

Type	Name	Description
HeatPort_a	heatPort	Optional port to which dissipated losses are transported in form of heat

Modelica definition

partial model PartialElementaryConditionalHeatPort 
  "Partial model to include a conditional HeatPort in order to dissipate losses, used for textual modeling, i.e., for elementary models"
  parameter Boolean useHeatPort = false "=true, if heatPort is enabled";
  parameter Modelica.SIunits.Temperature T=293.15 
    "Fixed device temperature if useHeatPort = false";
  Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a heatPort(
    final T=TheatPort,
    final Q_flow=-lossPower) if useHeatPort 
    "Optional port to which dissipated losses are transported in form of heat";
  Modelica.SIunits.Power lossPower 
    "Loss power leaving component via heatPort (> 0, if heat is flowing out of component)";
  Modelica.SIunits.Temperature TheatPort "Temperature of heatPort";
equation 
  if not useHeatPort then
     TheatPort = T;
  end if;
end PartialElementaryConditionalHeatPort;

Modelica.Thermal.HeatTransfer.Interfaces.PartialElementaryConditionalHeatPortWithoutT

Information

This partial model provides a conditional heat port for dissipating losses.

• If useHeatPort is set to false (default), no heat port is available, and the thermal loss power is dissipated internally. In this case, the parameter T specifies the fixed device temperature (the default for T = 20°C)
• If useHeatPort is set to true, the heat port is available.

If this model is used, the loss power has to be provided by an equation in the model which inherits from PartialElementaryConditionalHeatPort model (lossPower = ...). The device temperature TheatPort can be used to describe the influence of the device temperature on the model behaviour.

Parameters

Type	Name	Default	Description
Boolean	useHeatPort	false	=true, if heatPort is enabled

Connectors

Type	Name	Description
HeatPort_a	heatPort	Optional port to which dissipated losses are transported in form of heat

Modelica definition

partial model PartialElementaryConditionalHeatPortWithoutT 
  "Partial model to include a conditional HeatPort in order to dissipate losses, used for textual modeling, i.e., for elementary models"
  parameter Boolean useHeatPort = false "=true, if heatPort is enabled";
  Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a heatPort(
    final Q_flow=-lossPower) if useHeatPort 
    "Optional port to which dissipated losses are transported in form of heat";
  Modelica.SIunits.Power lossPower 
    "Loss power leaving component via heatPort (> 0, if heat is flowing out of component)";
end PartialElementaryConditionalHeatPortWithoutT;

Modelica.Thermal.HeatTransfer.Interfaces.PartialConditionalHeatPort

Information

This partial model provides a conditional heat port for dissipating losses.

• If useHeatPort is set to false (default), no heat port is available, and the thermal loss power is dissipated internally. In this case, the parameter T specifies the fixed device temperature (the default for T = 20°C)
• If useHeatPort is set to true, the heat port is available.

If this model is used, the internalHeatPort has to be connected in the model which inherits from PartialElementaryConditionalHeatPort model. The device temperature internalHeatPort.T can be used to describe the influence of the device temperature on the model behaviour.

Parameters

Type	Name	Default	Description
Boolean	useHeatPort	false	=true, if HeatPort is enabled
Temperature	T	293.15	Fixed device temperature if useHeatPort = false [K]

Connectors

Type	Name	Description
HeatPort_a	heatPort	Optional port to which dissipated losses are transported in form of heat

Modelica definition

partial model PartialConditionalHeatPort 
  "Partial model to include a conditional HeatPort in order to dissipate losses, used for graphical modeling, i.e., for bulding modelsby drag-and-drop"
  parameter Boolean useHeatPort = false "=true, if HeatPort is enabled";
  parameter Modelica.SIunits.Temperature T=293.15 
    "Fixed device temperature if useHeatPort = false";
  Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a heatPort if useHeatPort 
    "Optional port to which dissipated losses are transported in form of heat";
  Modelica.Thermal.HeatTransfer.Sources.FixedTemperature fixedTemperature(final T=T) if not useHeatPort;
protected 
  HeatPort_a internalHeatPort;
equation 
  connect(heatPort, internalHeatPort);
  connect(fixedTemperature.port, internalHeatPort);
end PartialConditionalHeatPort;