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TEG Generation Theory
Е=α·ΔТ – thermo electromotive force (EMF); α - thermo EMF coefficient;
Е=α·ΔТ – thermo electromotive force (EMF);
α - thermo EMF coefficient;
ΔТ=Th-Tc – temperature difference;
Th – the hot side temperature;
Tc – the cold side temperature;
Qh and Qc – heat-flow energy;
RL - load resistance;
I – electric current.
To provide the temperature difference between TGM sides, it is necessary to support direct heat flow (Qh) to its hot side and to dissipate heat flow (Qc) from its cold side. Electrical power available at the load is proportional to squared different oftemperatures ΔT:
P = Qh – Qc = I2 . RL ~ ΔT2
To achieve the maximum power the value of load resistance RL should be equal to TGM internal resistance.
TEG: Thermoelectric generating module
Ri: Value of internal electric resistance of TGM at working temperature
U: Value of output voltage with load resistance RL =Ri
I: Value of output current with load resistance RL =Ri
P: Value of output electrical power with load resistor RL =Ri
System of notation:
A universal abbreviation is used to notate TEG: TEG-N-C-h, where:
TEG：Thermoelectric generation modules
N — number of thermocouples in the cooler;
С — length of the edge of the thermoelectric element basis (in millimeters);
h — height of the thermoelectric element (in millimeters).
For example: TEG-127-1,0-1,3 consists of 127 thermocouples (254 thermoelectric elements), every element has the cross-section of 1,0x1,0 mm and is 1,3 mm high.
