Peltier element, Notas de estudo de Engenharia Elétrica

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Testing a Peltier

Element

Ingrid Ajaxon, Johan Lindahl & Harald Ny Advisor: C-G. Ribbing

The Peltier-effect describes the

heat current that arises when

an electrical current is led

through an interface between to

conducting materials

Theory

Commercial Peltier

elements

• (^) Limiting factors:
  • (^) Resistive heating
  • (^) Heat dissipation Cooling power: K T R I P I A B          2 ( ) 2

Cooling power of a

single

pair of junctions

Experimental set-up

QuickTime och en -dekomprimerare krävs för att kunna se bilden. Sketch of the experimental setup

Results

The temperature inside the cavity as a function of the current through the Peltier element

The temperature difference between the cavity and the surroundings  T  17. 46  I  6. 37  I 2

ΔT can now be written as a function of the current (I)

2 ( ) 2 I C K R I C K T total          The constants in this equation can be identified from the polynomial fitted to the measured data 2

 T  17. 46  I  6. 37  I

6. 37 2 ( )
7. 46 ( )       C K R C K total ( C  K )  0. 46 W / K V total   8. 12

Limiting factors

• Thermal insulation of the cavity
• Losses through radiation
• Heat dissipation on the hot side
• Peltier coefficient of the element
• Thermal conductivity of the element