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D APPENDIX D: TECHNOLOGY SOLUTIONS FOR ENERGY RECOVERY In a thermoelectric power generator, a temperature differential between the upper and lower surfaces of two legs of the device generates power. If a power-consuming load is not attached to the generator (open-circuited), the applied heat source (H) results in a temperature differential (T) of some value dictated only by the thermal conductivity of the p- and n-type semiconductor legs. Since no current would flow in the thermoelectric device, no power would be generated. Because of the Seebeck effect, however, a voltage would be present at the output terminals, just like in an unconnected battery. When a load is attached, current will flow through the load. The Seebeck voltage Vα=αΔT is divided between two terms: the internal device voltage drop IRint due to the internal resistance Rint = 2ρ(L/a) (for the couple), and the external voltage drop IRL. It is the Seebeck voltage and these two resistances that dictate the flow of current (and the generated output electrical power) given by: I= 2"!T (3) (Rint +RL) 103PDF Image | Analysis for Recovering Energy from Industrial Waste Heat
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