Modelica.Thermal.HeatTransfer.Sources

Information

Extends from Modelica.Icons.Library2 (Icon for library where additional icon elements shall be added).

Package Content

Name	Description
FixedTemperature	Fixed temperature boundary condition in Kelvin
PrescribedTemperature	Variable temperature boundary condition in Kelvin
FixedHeatFlow	Fixed heat flow boundary condition
PrescribedHeatFlow	Prescribed heat flow boundary condition

Modelica.Thermal.HeatTransfer.Sources.FixedTemperature

Information

This model defines a fixed temperature T at its port in Kelvin, i.e., it defines a fixed temperature as a boundary condition.

Parameters

Type	Name	Default	Description
Temperature	T		Fixed temperature at port [K]

Connectors

Type	Name	Description
HeatPort_b	port

Modelica definition

model FixedTemperature 
  "Fixed temperature boundary condition in Kelvin"

  parameter Modelica.SIunits.Temperature T "Fixed temperature at port";
  Interfaces.HeatPort_b port;
equation 
  port.T = T;
end FixedTemperature;

Modelica.Thermal.HeatTransfer.Sources.PrescribedTemperature

Information

This model represents a variable temperature boundary condition. The temperature in [K] is given as input signal T to the model. The effect is that an instance of this model acts as an infinite reservoir able to absorb or generate as much energy as required to keep the temperature at the specified value.

Connectors

Type	Name	Description
HeatPort_b	port
input RealInput	T

Modelica definition

model PrescribedTemperature 
  "Variable temperature boundary condition in Kelvin"

  Interfaces.HeatPort_b port;
  Modelica.Blocks.Interfaces.RealInput T;
equation 
  port.T = T;
end PrescribedTemperature;

Modelica.Thermal.HeatTransfer.Sources.FixedHeatFlow

Information

This model allows a specified amount of heat flow rate to be "injected" into a thermal system at a given port. The constant amount of heat flow rate Q_flow is given as a parameter. The heat flows into the component to which the component FixedHeatFlow is connected, if parameter Q_flow is positive.

If parameter alpha is > 0, the heat flow is mulitplied by (1 + alpha*(port.T - T_ref)) in order to simulate temperature dependent losses (which are given an reference temperature T_ref).

Parameters

Type	Name	Default	Description
HeatFlowRate	Q_flow		Fixed heat flow rate at port [W]
Temperature	T_ref	293.15	Reference temperature [K]
LinearTemperatureCoefficient	alpha	0	Temperature coefficient of heat flow rate [1/K]

Connectors

Type	Name	Description
HeatPort_b	port

Modelica definition

model FixedHeatFlow "Fixed heat flow boundary condition"
  parameter Modelica.SIunits.HeatFlowRate Q_flow "Fixed heat flow rate at port";
  parameter Modelica.SIunits.Temperature T_ref=293.15 "Reference temperature";
  parameter Modelica.SIunits.LinearTemperatureCoefficient alpha=0 
    "Temperature coefficient of heat flow rate";
  Interfaces.HeatPort_b port;
equation 
  port.Q_flow = -Q_flow*(1 + alpha*(port.T - T_ref));
end FixedHeatFlow;

Modelica.Thermal.HeatTransfer.Sources.PrescribedHeatFlow

Information

This model allows a specified amount of heat flow rate to be "injected" into a thermal system at a given port. The amount of heat is given by the input signal Q_flow into the model. The heat flows into the component to which the component PrescribedHeatFlow is connected, if the input signal is positive.

If parameter alpha is > 0, the heat flow is mulitplied by (1 + alpha*(port.T - T_ref)) in order to simulate temperature dependent losses (which are given an reference temperature T_ref).

Parameters

Type	Name	Default	Description
Temperature	T_ref	293.15	Reference temperature [K]
LinearTemperatureCoefficient	alpha	0	Temperature coefficient of heat flow rate [1/K]

Connectors

Type	Name	Description
input RealInput	Q_flow
HeatPort_b	port

Modelica definition

model PrescribedHeatFlow "Prescribed heat flow boundary condition"
  parameter Modelica.SIunits.Temperature T_ref=293.15 "Reference temperature";
  parameter Modelica.SIunits.LinearTemperatureCoefficient alpha=0 
    "Temperature coefficient of heat flow rate";
  Modelica.Blocks.Interfaces.RealInput Q_flow;
  Interfaces.HeatPort_b port;
equation 
  port.Q_flow = -Q_flow*(1 + alpha*(port.T - T_ref));
end PrescribedHeatFlow;