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Symmetry 2020, 12, x FOR PEER REVIEW 6 of 12 Symmetry 2020, 12, 1963 6 of 12 Figure 3. Assembly of waste heat recovering thermoelectric generator (TEG) system. Imitating exhaust pipe systems capable of waste heat recovery, the porous copper heat exchanger is stored inside the pipe system to maximize the heat transfer. The water jacket attached to the other side of the thermoelectric module was designed and aluminum is selected due to anti- corrosion characteristics and high heat conductivity. Between the water cooling jacket and exhaust pipe system, a commercial thermoelectric module is attached. Figure 3. Assembly of waste heat recovering thermoelectric generator (TEG) system. Figure 3. Assembly of waste heat recovering thermoelectric generator (TEG) system. Imitating exhaust pipe systems capable of waste heat recovery, the porous copper heat exchanger is stored inside the pipe system to maximize the heat transfer. The water jacket attached to the other side of the thermoelectric module was designed and aluminum is selected due to anti- corrosion characteristics and high heat conductivity. Between the water cooling jacket and exhaust pipe system, a commercial thermoelectric module is attached. Figure 4. Schematic of a TEG experimental setup. The experimental setup is divided into two parts: Figure 4. Schematic of a TEG experimental setup. The experimental setup is divided into two parts: (1) hardware for the experiment—hot air blower, exhaust pipe, a thermoelectric system with heat (1) hardware for the experiment—hot air blower, exhaust pipe, a thermoelectric system with heat exchanger, water chamber to supply cold water; (2) data acquisition system: desktop computer, sensors exchanger, water chamber to supply cold water; (2) data acquisition system: desktop computer, to measure electricity, temperature, data logger. sensors to measure electricity, temperature, data logger. Imitating exhaust pipe systems capable of waste heat recovery, the porous copper heat exchanger is stored inside the pipe system to maximize the heat transfer. The water jacket attached to the other 2.3. Power Generation Performance of TEM with Various Heat sink Types side of the thermoelectric module was designed and aluminum is selected due to anti-corrosion For the present experiment, a total of six types of heat sinks were applied to the module, and characteristics and high heat conductivity. Between the water cooling jacket and exhaust pipe system, eachFhigeuartes4in. kScheamdaitisc bofelaoTnEgGinegxpcaesriemaesntsahloswetunpi.nThFeigeuxrper5im. Tehntealesxeptueprimis ednivtiwdeadsincotontdwuoctpeadrtisn: two a commercial thermoelectric module is attached. steps(.1)Fohrarndawtuarealfocronthveeecxtipoenricmoeonlti—ngh,ootnaliyr tbhloewheera, texsihnakuswt apsipaet,tacthedrmtoetlhecetrcioc lsdystiedme owfithehematodule 2.3. Power Generation Performance of TEM with Various Heat sink Types in thexfcihrsatngsteerp, .wIantetrhechsaemcobnedr tsotespu,papclyoocloilndgwfantewr; a(2s)adttatcahaecdqutoisitthioenhseyasttesmin:kd, feoskrtfooprcceodmcpountevre,ction sensoFrosrttohme peraessuernetelxepcterriicmityen, te, ma tpoetaral toufrsei,xdtaytpaelsoogfghere.at sinks were applied to the module, and each cooling. The cooling fan had a maximum flowrate of 10 CFM and consumed 5 W of electrical power. heat sink had its belonging case as shown in Figure 5. The experiment was conducted in two steps. Additionally, it was attached to the heat sink in a way so that the air could flow in a parallel direction 2.3. PFowr enraGtuernaelrcaotinovnePcteirofnorcmoaonlicnego, foTnElyMthwe ihtheaVt asriinokuswHaseatttsainchkeTdytpoesthe cold side of the module in to the fins. As the module performance experiment, the module hot side temperature was controlled the first step. In the second step, a cooling fan was attached to the heat sink, for forced convection by the copper heating plate from 50–230 ° C and was increased by 30 °C for each step. To decrease For the present experiment, a total of six types of heat sinks were applied to the module, and cooling. The cooling fan had a maximum flowrate of 10 CFM and consumed 5 W of electrical power. the thermal contact, the thermal compound (silicone grease) was injected at the interface and the each heat sink had its belonging case as shown in Figure 5. The experiment was conducted in two Additionally, it was attached to the heat sink in a way so that the air could flow in a parallel direction compressive force was applied on the whole pile by using the C-clamp. As the hot/cold side steps. For natural convection cooling, only the heat sink was attached to the cold side of the module to the fins. As the module performance experiment, the module hot side temperature was controlled temperature of the module stabilized, the power was soon measured. in the first step. In the second step, a cooling fan was attached to the heat sink, for forced convection by the copper heating plate from 50–230 ◦ C and was increased by 30 ◦C for each step. To decrease coolitnhge.tThheremcaolocliongtafcatn, thaedthaermaxlicmomumpofulonwd r(saitleiconfe10grCeFasMe)awnadscionjnescutemdeadt t5heWinotfereflaeccetraincadltphoewer. Additionally, it was attached to the heat sink in a way so that the air could flow in a parallel direction to the fins. As the module performance experiment, the module hot side temperature was controlled by the copper heating plate from 50–230 ° C and was increased by 30 °C for each step. To decrease the thermal contact, the thermal compound (silicone grease) was injected at the interface and the compressive force was applied on the whole pile by using the C-clamp. 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