ThermalConductor

Lumped thermal element transporting heat without storing it

    ThermalConductor

Library

Modelica/Thermal/HeatTransfer/Components

Description

This is a model for transport of heat without storing it; see also:ThermalResistor.It may be used for complicated geometries wherethe thermal conductance G (= inverse of thermal resistance)is determined by measurements and is assumed to be constantover the range of operations. If the component consists mainly ofone 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_out: Outer radius of cylinder    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

ThermalConductor_0

NameLabelDescriptionData TypeValid Values

mo_G

G

Constant thermal conductance of material

Scalar

ThermalConductor_1

NameLabelDescriptionData TypeValid Values

mo__nmodifiers

Number of Modifiers

Specifies the number of modifiers

Number

mo__modifiers

Modifiers

Add new modifier

Structure

mo__modifiers/varname

Variable name

Cell of strings

'Q_flow'
'dT'

mo__modifiers/attribute

Attribute

Cell of strings

'start'
'fixed'

mo__modifiers/value

Value

Ports

NameTypeDescriptionIO TypeNumber

port_a

implicit

input

1

port_b

implicit

output

1