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Symmetry 2020, 12, 1963 7 of 12 compressive force was applied on the whole pile by using the C-clamp. As the hot/cold side temperature Symmetry 2020, 12, x FOR PEER REVIEW 7 of 12 of the module stabilized, the power was soon measured. CASE 1 2 3 Shape Type Extruded Fin-bonded Pin Size 125X125X45(mm3) 125X125X45(mm3) 125X125X45(mm3) FinNumber 13 46 169 Thickness(Fin/Pitch) 3/7(mm) 1/2(mm) 3/7(mm) CASE 4 5 6 Shape Type Extruded Extruded Extruded Size 125X125X70(mm3) 125X125X120(mm3) 125X125X120(mm3) FinNumber 12 25 9 Thickness(Fin/Pitch) 4/11(mm) 2/8(mm) 2/10(mm) Figure 5. Heat sink specifications. Basic specification of the six types of heat sinks used in the Figure 5. Heat sink specifications. Basic specification of the six types of heat sinks used in the thermoelectric experiment (size, fin numbers, and thickness of fin/pitch). thermoelectric experiment (size, fin numbers, and thickness of fin/pitch). 3. Results and Discussion 3. Results and Discussion 3.1. Module Performance Experimental Results Figure 6a describes the open-circuit voltage and electrical power of the HZ20 model, depending 3.1. Module Performance Experimental Results on the module’s hot side temperature. Since ∆T has a linear relationship with voltage according Figure 6a describes the open-circuit voltage and electrical power of the HZ20 model, depending to Equation (1), the power has a double square relationship with ∆T accordingly. For the hot side on the module’s hot side temperature. Since ΔT has a linear relationship with voltage according to temperature condition, the model achieved the maximum power output of 15.5 W. Figure 6b shows the Equactlioosned(-c1i)r,cuthitevoplotawgeranhdaesleactrdicoaulbploewseqrudaerpenrdeilnagtionstheiploawditrhesiΔstTanaceccvoarludein. Tghlye.mFeoarsutrheemhenotts side tempweerraetudroenecownhdeintitohne,htohtesimdeotdemelpaecrhatiuerveeodf themoadxuilme wumas aptotwheehrioghuetsptu, wt ohfic1h5i.s52W30. FCi.gItucroeu6ldbbsehows seen that the electric power of the thermoelectric module achieved its maximum at the load resistance the closed-circuit voltage and electrical power depending on the load resistance value. The value of 0.3 Ω. From such fact, it could be induced those load resistance value matched with the measurements were done when the hot side temperature of the module was at the highest, which is internal resistances of the thermoelectric module. Additionally, the values were the same as the internal 230 °C. It could be seen that the electric power of the thermoelectric module achieved its maximum resistances labeled in Table 1. In Figure 6c, the open-circuit voltage was measured depending on the at the load resistance value of 0.3 Ω. From such fact, it could be induced those load◦resistance value compressive force applied to the thermoelectric module at hot side temperature 230 C. From the matched with the internal resistances of the thermoelectric module. Additionally, the values were the graphs, it could be known that there existed an optimal point of the compressive force where the same as the internal resistances labeled in Table 1. In Figure 6c, the open-circuit voltage was measured maximum generation performance could be achieved. The open-circuit voltage was maximized depending on the compressive force applied to the thermoelectric module at hot side temperature when 200 kgf of compressive forces had been applied. Applying more compressive force resulted 230 °C. From the graphs, it could be known that there existed an optimal point of the compressive in the generation performance decrease. One possible reason could be the internal crack within the forcethwerhmeroeltehcetrimc maxoidmuulembegceanueseraotfiothnepeexrcfeossrmcoamnpcreecssoiuveldfobrecea.chieved. The open-circuit voltage was maximized when 200 kgf of compressive forces had been applied. Applying more compressive force resulted in the generation performance decrease. One possible reason could be the internal crack within the thermoelectric module because of the excess compressive force. ◦PDF Image | Small Thermoelectric System Applicable to Real-Time PCR Devices
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