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ThermalResistor

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ThermalResistor

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Iconic Diagrams\Mechanical\Thermal\Components

Use

Domains: Continuous. Size: 1-D. Kind: Iconic Diagrams (Pseudothermal).

Description

When a temperature difference exists in a material, heat will flow from the high temperature part to the low temperature part. This model describes the transport of heat through a block of material with a temperature difference on both sides of the block. The insulation capacity of the block is indicated by the parameter R (thermal resistance):

 

p.dQ = p.T/R;

 

This model is the dual form of the thermal conductor where the heat conducting capacity of the material is indicated by the parameter G (thermal conductance):

 

p.dQ = p.T*G;

 

The heat flow through the material is ideal. I.e. there is no heat storage modeled. The thermal resistance model has separate high and low ports. The equations are

 

p.dQ = p_high.dQ = p_low.dQ

p.T = p_high.T - p_low.T

 

Block

The thermal resistance of a block can be calculated with the specific thermal conductivity k, the length L of the block, and the area A of both sides of the block:

 

 R = L/(k*A)

 

Typical values of the thermal conductivity [W.m-1.K-1] are:

 

water

granite

glass

aluminium

concrete

copper

silver

iron / steel

wood

air

0.6

2,1

1.0

210

1.28

390

430

40-70

0.13

0.026

Interface

Ports

Description

p_high, p_low

Both terminals of the pseudothermal port p

Causality

 

indifferent

 

Parameters

 

R

thermal resistance [K/W]