# ThermalConductor

Lumped thermal element transporting heat without storing it

# Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

This is a model for transport of heat without storing it; see also: ThermalResistor. It may be used for complicated geometries where the thermal conductance G (= inverse of thermal resistance) is determined by measurements and is assumed to be constant over the range of operations. If the component consists mainly of one type of material and a regular geometry, it may be calculated, e.g., with one of the following equations:

• Conductance for a box geometry under the assumption that heat flows along the box length:

```    G = k*A/L
k: Thermal conductivity (material constant)
A: Area of box
L: Length of box
```
• Conductance for a cylindrical geometry under the assumption that heat flows from the inside to the outside radius of the cylinder:

```    G = 2*pi*k*L/log(r_out/r_in)
pi   : Modelica.Constants.pi
k    : Thermal conductivity (material constant)
L    : Length of cylinder
log  : Modelica.Math.log;
r_in : Inner radius of cylinder
```
```    Typical values for k at 20 degC in W/(m.K):
aluminium   220
concrete      1
copper      384
iron         74
silver      407
steel        45 .. 15 (V2A)
wood         0.1 ... 0.2
```

# Parameters (1)

G Value: Type: ThermalConductance (W/K) Description: Constant thermal conductance of material

# Connectors (2)

port_a Type: HeatPort_a Type: HeatPort_b

# Used in Examples (13)

 HeatingMOSInverter Modelica.Electrical.Analog.Examples Heating MOS Inverter HeatingNPN_OrGate Modelica.Electrical.Analog.Examples Heating NPN Or Gate HeatingPNP_NORGate Modelica.Electrical.Analog.Examples Heating PNP NOR Gate HeatingResistor Modelica.Electrical.Analog.Examples Heating resistor HeatingRectifier Modelica.Electrical.Analog.Examples Heating rectifier DCPM_Cooling Modelica.Electrical.Machines.Examples.DCMachines Test example: Cooling of a DCPM motor HeatingSystem Modelica.Fluid.Examples Simple model of a heating system IndirectCooling Modelica.Thermal.FluidHeatFlow.Examples Indirect cooling circuit OneMass Modelica.Thermal.FluidHeatFlow.Examples Cooling of one hot mass TwoMass Modelica.Thermal.FluidHeatFlow.Examples Cooling of two hot masses TwoMasses Modelica.Thermal.HeatTransfer.Examples Simple conduction demo ControlledTemperature Modelica.Thermal.HeatTransfer.Examples Control temperature of a resistor Motor Modelica.Thermal.HeatTransfer.Examples Second order thermal model of a motor

# Used in Components (1)

 Conduction Modelica.Thermal.HeatTransfer.Examples.Utilities Input/output block of a conduction model