Published on December 5, 2013
Thermo Electric Effect By: Ahmed Diaa El Din
What is it ? The thermoelectric effect is the direct conversion of temperature differences to electric voltage . The direction of heat flow can be controlled by changing polarity of the voltage source.
History In the 1820’s Thomas Seebeck (Germany) discovered that if two metals at different temperatures were touching you could create an electric current. Jean Peltier discovered that the opposite was also true. By sending a current through two metals you could create differences in temperature.
Seebeck Effect Discover Seebak Coefficient : S=-∆V/ ∆T ΔV is the voltage difference. ΔT is the temperature difference between the hot and cold sides . The negative sign comes from the negative charge of the electron.
Peltier Effect Discover The efficiency by which a material is capable of generating power (Z) K thermal Conductivity - σ electrical Conductivity - S seebak coff.
Why does this Effect Occur? Charge Carrier Diffusion and Phonon Drag Peltier Effect Seebeck Effect
Applications Thermoelectric generator Cooling Computers Drink Coolers Recharging Devices Space Probes Solar Power Clothing
References * G. Jeffrey Snyder and Eric S. Toberer "Complex Thermoelectric Materials" Nature Materials 7, 105-114 (2008). * G. Jeffrey Snyder, Tristan Ursell. "Thermoelectric efficiency and compatibility" Physical Review Letters, Vol 91 p. 148301 (2003) * CRC Handbook of Thermoelectrics, Introduction, Edited by D.M. Rowe, CRC Press, 1995. * Rockwood, Alan L. (1984). "Relationship of thermoelectricity to electronic entropy". Phys. Rev. A 30 (5): 2843–4. Bibcode 1984PhRvA..30.2843R. doi:10.1103/PhysRevA.30.2843 * http://www.thepowerpot.com/how-thermoelectric-generators-work
Thank You Questions ?
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