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Energy Harvesting from the Waste Heat of an Electrical Oven TEG

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Energy Harvesting from the Waste Heat of an Electrical Oven TEG ( energy-harvesting-from-waste-heat-an-electrical-oven-teg )

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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 2. Experimental setup A schematic diagram and actual photograph of the experimental setup is shown in figure 1. Two K- type thermocouples were used to measure the temperature of the hot side (TH) and the cold side (TC) of thermoelectric. The top thermocouple was attached to the surface of the oven by drilling a hole inside a copper plate to measure the hot side temperature. The cold side temperature was measured by using another thermocouple connected to the heat sink. Figure 1. Shows a schematic diagram (a), and actual photograph of the experimental (b). A thin uniform layer of heat sink compound with a thermal conductivity of 2.9 W/m.K was applied between the oven and the thermoelectric also, between the cold side and the thermoelectric. A thermoelectric device (40 mm x 40 mm geometry and 256 legs) has been used during the experimental setup. The thermoelectric generator is able to convert the thermal energy into electrical energy directly which is an alternative method to produce potential energy. The efficiency of thermoelectric converters in general, depends on the material and design aspects such as the number of legs and the lengths [2]. Also, the heat transfer conditions have a significant influence on power output generation and the efficiency of TEG. It is worth to mention that the power output in this work was calculated using the following formula which is usually used to calculate the power output in open circuit mode P = V2 [14], 4R were v is open circuit voltage and R is the internal resistance of the TEG device. The internal resistance of TEG could be obtained by connecting different loads to the TEG, and then the value of the load at the maximum power output represents the internal resistance of the TEG. The focus of this work is developing tools for the evaluation of thermoelectric power generation from the waste heat of an electrical oven. The power generated from this rig could be used for charging cell phone or other uses. 2

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