Tcold | Cold side temperature | For specifications it is equal to ambient temperature Ta=300K (27 deg.C) |
Thot | Hot side temperature | All specifications are given to three hot side temperatures 35, 55, 85 °C. This provides ΔT 8, 28 and 58 °C, correspondingly |
ΔT | Operation temperature difference | Operation temperature difference between Tcold and Thot sides. ΔT=Thot-Tcold |
Rt | Thermal resistance of TEG | Thermal resistance of TEG in direction perpendicular to cold and hot sides (parallel to heat flux Q through the TEG) |
N | Number of pairs of thermoelements | Number of pairs of thermoelements in the TEG |
Rteg | Resistance of TEG | Measured at AC. In Specifications at given ΔT the ACR is given at average temperature between Tcold and Thot |
α | Seebeck coefficient | Seebeck coefficient of a pair of thermoelements of the TEG |
Z | Figure-of-Merit of the TEG | It is temperature depending. Typically 2.7-2.9x10-3 K-1 at Ta=300K |
Q | Heat flux through TEG | Total Heat Flux coming through the TEG. Q=ΔT x Rt |
Uoc | Open circuit voltage | Maximal voltage generated by TEG at given ΔT. Other words it is electromotive force. Uoc=N x α x ΔT. |
Isc | Short circuit current | Current at short circuit. Isc=Uoc/Rteg |
Rload | Load resistance | Resistance of external electric scheme which consumes power of TEG |
Umax | Maximal output voltage | Maximal output voltage and maximal power are at the equity Rload=Rteg |
Pmax | Maximal output power | |
m | Coefficient of optimal electric load | It is given as m=(1+Z (Thot+Tcold)/2)^0.5 ~ 1.3…1.4 |
Ropt | Optimal load resistance | Resistance of electric load which provides maximal efficiency of the TEG. Ropt=Rteg x m |
nopt | Optimal efficiency of the TEG | Optimal (maximal) efficiency which can provide the TEG at optimal electric load Rload=Ropt |
Uout | Optimal output voltage | The output voltage at maximal efficiency. Optimal voltage is given as Uout=Uoc/(Rteg *(1+m)) |
Pout | Optimal output power | Output power generated by the TEG at maximal efficiency Pout=Uout^2 x Ropt |
H | Total TEC height | All dimensions are given in mm. Dimensions A and C are perpendicular to electric wires direction (See drawings at specifications). |
A x B | Hot side dimensions |
C x D | Cold side dimensions |