Hi all !
Can someone help me with this ?
I need to compute the Thermal Efficiency of a TEG module (Thermoelectric module operating as a Electrical Energy Generator)
After doing some research in the literature I found two different ways (or expressions) to compute the thermal efficiency of this module:
1.) eta = ((Thot - Tcold)/Thot) * [sqrt(1 + ZT) - 1) / (sqrt(1 + ZT) +(Tcold/Thot))]
2.) eta = W_elec/Qhot
For the second case the expression for W_elec and Qhot can be calculated from parameters as the Seebeck Coefficients, Thermal Conductances, Electric Resistances, Temperature Difference between Thot and Tcold, etc.
Does anyone know what is the correct way to obtain eta for TE module ?
I'll appreciate any help
Regards !
Dear Franklin,
Your definition 2) is the general one, and is always valid.
Defnition 1) is obtained from it by optimizing eta with respect to the ratio
M=R_load/R, where R_load is the resistance of the external load to which the power is delivered and R is the internal resistance of your thermoelectric device.
The optimum value of M is sqrt(1+ZT_M), where T_M is (T_hot+ T_cold)/2. Your T in definition 1) is T_M.
See Chapter 6 of the book "Modern Theory of Thermoelectricity", which I published together with Veljko Zlatic. Unfortunately I am not allowed to send you that chapter for copyright reasons.
Best regards, René Monnier
Thank You R. Monnier , I will search for it ,
Regards !
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