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World Scientific News 48 (2016) 133-148 Figure 1. Thermoelectric generator. The Peltier cell is a semiconductor element, which is constructed of two thin ceramic tiles between which are serially arranged semiconductors of bismuth telluride doped appropriately with antimony and selenium. On each tile are separate copper tracks between which semiconductors are arranged. To draw current from the cells, it is necessary to have an electric cable attached to semiconductors. The cell uses the Peltier effect, which consists in separation or energy absorption (depending on the side of the device) by a flow of electric current through the connector. As a result of energy absorption on one connector and power secreted on the other develops a temperature difference between terminals. The situation can also be reversed and instead to connecting to cell, the electric current for cooling one and warming another its part, you can put the cell between temperature differences in order to obtain an electric current, the cell can be put between temperature differences in order to obtain an electric current. With such an operation can be obtained the Seebeck thermoelectric phenomenon involving on the formation of electromotive force in a circuit (which contains two metals or semiconductors) when the connectors are located at different temperatures. The Peltier element is a thermal machine, which can act as an engine, refrigerator and heat pump. It is a small element containing any moving parts in contrast to conventional thermal machines. The work is here the work of electrical current equal the product of voltage, current and time. The efficiency of a Peltier element remains significantly lower than the limit, so the research work are conducted continuously in order to lift it. The materials for building the Peltier cells having both high value of Peltier coefficient, low resistivity ρ and a low coefficient of thermal conductivity K are looked for. -137-PDF Image | The energy harvesting from waste heat
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