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Energies 2021, 14, 204 7 of 14 Energies 2021, 14, 204 A/L is the element geometric ratio, ηc, is the Carnot efficiency of the TEG module, ηmp is the maximum power efficiency of the TEG module, and Tavg is the average temperature between the hot and cold junctions of the TEG module. 3. Experimental Work 3.1. Experimental Procedure An experimental setup was specially constructed to validate the analytically obtained results. As depicted in the schematic diagram of the experimental setup in Figure 4, a thermoelectric module (TEC1-12706) was attached to an aluminum heat sink 40 mm × 40 mm × 10 mm in dimension, which was placed inside a fabricated aluminum channel 40 mm × 40 mm × 150 mm in dimension. The hot air was supplied to the heat sink through the channel by a heat gun that emulated the exhaust gas. The entire hot-side channel was insulated by high-temperature insulation. An anemometer of ±5% accuracy was used to measure the hot air velocity at the exit of the hot-side channel. A specially fabricated aluminum channel 40 mm × 20 mm × 150 mm in dimension was used as a heat exchanger on the cold side. A small water pump with a known volumetric flow rate circulated cooling water through the cold-side channel. Lastly, the inlet and outlet temperatures of the hot and cold fluids were measured using four K-type thermocouples with standard limits of error of 0.75%, placed at the inlets and the outlets of the channels. Figure 5 shows the 8 of 15 different views of the experimental setup. The effective Seebeck coefficient is: α∗ = The effective figure of merit is: . 4Wmax nImax(Th −Tc) 2 1+Tc (23) (24) Tavg Th Z=1 1 ηc ηmp+2 −2 ∗ FiFgiugruer4e. S4c.hSecmhaetmicadtiiacgdraimagorfatmheoefxtpheerimexepnetarlimseetunpta. l setup.PDF Image | Thermoelectric Generator (TEG) System for Automotive Exhaust
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