How to calculate the efficiency?
Let say we have a module consisting of 5 thermoelectric generator (TEGs) in a series, to calculate power theoretically, we use P=Qh-Qc, where Qh is heat flux at the hot junction and Qc at the cold junction.
Since the TEGs are in series then total power will be P_tot=P1+P2+P3+P4+P5=5*P.
Now to calculate the efficiency, we use eta=P/Qh for one TEG but for 5 TEGS will eta=5*P/(5*Qh). Is this correct?