WOLFRAM SYSTEMMODELER

HeatCapacitor

Lumped thermal element storing heat

Wolfram Language

In[1]:=
SystemModel["Modelica.Thermal.HeatTransfer.Components.HeatCapacitor"]
Out[1]:=

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

Parameters (1)

C

Value:

Type: HeatCapacity (J/K)

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

Connectors (1)

port

Type: HeatPort_a

Used in Examples (19)

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

HeatingRectifier

Modelica.Electrical.Analog.Examples

Heating rectifier

DCPM_Cooling

Modelica.Electrical.Machines.Examples.DCMachines

Test example: Cooling of a DCPM motor

EddyCurrentBrake

Modelica.Mechanics.Rotational.Examples

Demonstrate the usage of the rotational eddy current brake

EddyCurrentBrake

Modelica.Mechanics.Translational.Examples

Demonstrate the usage of the translational eddy current brake

SimpleCooling

Modelica.Thermal.FluidHeatFlow.Examples

Simple cooling circuit

ParallelCooling

Modelica.Thermal.FluidHeatFlow.Examples

Cooling circuit with parallel branches

IndirectCooling

Modelica.Thermal.FluidHeatFlow.Examples

Indirect cooling circuit

PumpAndValve

Modelica.Thermal.FluidHeatFlow.Examples

Cooling circuit with pump and valve

PumpDropOut

Modelica.Thermal.FluidHeatFlow.Examples

Cooling circuit with drop out of pump

ParallelPumpDropOut

Modelica.Thermal.FluidHeatFlow.Examples

Cooling circuit with parallel branches and drop out of pump

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

GenerationOfFMUs

Modelica.Thermal.HeatTransfer.Examples

Example to demonstrate variants to generate FMUs (Functional Mock-up Units)

Used in Components (2)

DirectCapacity

Modelica.Thermal.HeatTransfer.Examples.Utilities

Input/output block of a direct heatCapacity model

InverseCapacity

Modelica.Thermal.HeatTransfer.Examples.Utilities

Input/output block of an inverse heatCapacity model