WOLFRAM SYSTEMMODELER

HeatCapacitor

Lumped thermal element storing heat

Wolfram Language

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SystemModel["Modelica.Thermal.HeatTransfer.Components.HeatCapacitor"]
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Information

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

This is a generic model for the heat capacity of a material. No specific geometry is assumed beyond a total volume with uniform temperature for the entire volume. Furthermore, it is assumed that the heat capacity is constant (independent of temperature).

The temperature T [Kelvin] of this component is a state. A default of T = 25 degree Celsius (= SIunits.Conversions.from_degC(25)) is used as start value for initialization. This usually means that at start of integration the temperature of this component is 25 degrees Celsius. You may, of course, define a different temperature as start value for initialization. Alternatively, it is possible to set parameter steadyStateStart to true. In this case the additional equation 'der(T) = 0' is used during initialization, i.e., the temperature T is computed in such a way that the component starts in steady state. This is useful in cases, where one would like to start simulation in a suitable operating point without being forced to integrate for a long time to arrive at this point.

Note, that parameter steadyStateStart is not available in the parameter menu of the simulation window, because its value is utilized during translation to generate quite different equations depending on its setting. Therefore, the value of this parameter can only be changed before translating the model.

This component may be used for complicated geometries where the heat capacity C is determined my measurements. If the component consists mainly of one type of material, the mass m of the component may be measured or calculated and multiplied with the specific heat capacity cp of the component material to compute C:

   C = cp*m.
   Typical values for cp at 20 degC in J/(kg.K):
      aluminium   896
      concrete    840
      copper      383
      iron        452
      silver      235
      steel       420 ... 500 (V2A)
      wood       2500

Connectors (1)

port

Type: HeatPort_a

Description:

Parameters (1)

C

Value:

Type: HeatCapacity (J/K)

Description: Heat capacity of element (= cp*m)

Used in Examples (15)

HeatingMOSInverter

Heating MOS Inverter

HeatingNPN_OrGate

Heating NPN Or Gate

HeatingRectifier

Heating rectifier

DCPM_Cooling

Test example: Cooling of a DCPM motor

SimpleCooling

Example: simple cooling circuit

ParallelCooling

Example: cooling circuit with parallel branches

IndirectCooling

Example: indirect cooling circuit

PumpAndValve

Example: cooling circuit with pump and valve

PumpDropOut

Example: cooling circuit with drop out of pump

ParallelPumpDropOut

Example: cooling circuit with parallel branches and drop out of pump

OneMass

Example: cooling of one hot mass

TwoMass

Example: cooling of two hot masses

TwoMasses

Simple conduction demo

ControlledTemperature

Control temperature of a resistor

Motor

Second order thermal model of a motor