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The Sixth Scientific Conference “Renewable Energy and its Applications” IOP Publishing IOP Conf. Series: Journal of Physics: Conf. Ser1i2e3s415063728(9200‘1’8“)”012024 doi:10.1088/1742-6596/1032/1/012024 3. Results and Discussion The oven was switched on for twenty minutes using both the upper and lower heater for the maximum temperature. The electrical oven was consumed electrical power (QP) approximately 686.4 W, which was calculated by multiplying the voltage by the current. First, the thermoelectric generator characterized using the open circuit method i.e without connecting load to the external circuit and the results are shown in figure 2. It can be shown in figure 2.a, the increase in the hot side temperature (TH), cold side temperature (TC) and the difference between them for the TEG with time. It is clear that both TH and TC are increasing with the time mainly due to transfer the heat from rear surface of the oven to the hot side of TEG then to the TC via TEG. The temperature difference across TEG causes generation of electricity by Seebeck effect as we can see in figure 2.b and the generated voltage is increased by increasing the temperature difference between them. figure 2.c showed the open circuit voltage and the power output as a function of hot side temperature. Both of them were increased with increasing the hot side temperature due to increase in the temperature difference between the hot side (electrical oven) and the cold side temperate (heat sink). After that, the load was connected to the TEG and the results are shown in figure 3. figure 3.a shows the voltage generated by connecting difference resistance to the circuit. It can be seen that, the TEG was characterised at constant temperature difference when the electrical oven reached to the steady state condition where the TC and TH about 87 °C and 101°C respectively. The power output was calculated by multiplying the voltage by the current and the results are demonstrated in figure 3.b and 3.c. This experiment showed that the waste heat from oven can be used to generate useful DC voltage and power, which may be used to charge cell phone or power DC light during the night. 3PDF Image | Energy Harvesting from the Waste Heat of an Electrical Oven TEG
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