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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:18 |
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Conference: Bucharest University Faculty of Physics 2018 Meeting
Section: Physics and Technology of Renewable and Alternative Energy Sources
Title:
Material classification based on optimal performance in each temperature range
Authors:
Esmaeil Jalali LAVASANI, George ZARNESCU, Laurentiu POPOVICI
Affiliation:
University of Bucharest, Faculty of Physics, 3 NanoSAE Research Center, Atomistilor Str 405, Magurele, Bucharest
E-mail
sanda.voinea@3nanosae.org
Keywords:
thermoelectric effect, thermal conductivity, electrical conductivity, Z merit, thermoelectric material classification
Abstract:
Thermoelectric effect consists in conversion of thermal energy into electrical energy and vice versa. Due to the thermoelectric devices advantages such as simplicity, the absence of toxic waste production, no need to specific maintenance during operation due to no moving parts or chemical reactions as well as long life and reducing greenhouse gas emissions are considered as a clean energy sources alternative to fossil fuels. Since one of the main disadvantages of using these devices is the low efficiency, it is must to consider the solutions necessary to improve their performance.That for this purpose, the parameter called Z merit must be examined. Z merit depends on Seebeck coefficient, thermal conductivity and electrical conductivity of different materials. For thermoelectric materials such as Bi2Te3 that works at room temperature the Z merit is 1 while Z is higher than or equal to 4 indicates optimal thermoelectric material performance. The higher temperature difference of the two sides of the thermoelectric generator produces more output power. On the other hand, the dependence of thermoelectric performance on temperature has made difficulty to use materials at all different temperatures. Therefore, in this paper, material properties and Z merit are investigated at different operating temperatures. At the end, the materials are classified according to the optimal performance at each temperature range.
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