Thermo electric effect


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Presentation about thermoelectric effect which is easy to understand for communication engineering #aast

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  • Seebeck noticed that when a loop comprised of two dissimilar materials was heated on one side, an electromagnetic field was created.  He actually discovered the EM field directly with a compass!  He noted that the strength of the electromagnetic field, and therefore the voltage, is proportional to the temperature difference between the hot and cold sides of the material.  The magnitude of the Seebeck coefficient (S) varies with material and temperature of operation. 
  • Peltier discovered that whenever a circuit of two dissimilar materials passes current, heat is absorbed at one end of the junction and released at the other.  This is a linearly dependent and thermodynamically reversible process, unlike Joule heating which is irreversible and quadratic in nature mean.  This process forms the basis for thermoelectric cooling and temperature control, these are currently the widest applications of thermoelectric devices. 
  • Thermo electric effect

    1. 1. Thermo Electric Effect By: Ahmed Diaa El Din
    2. 2. 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.
    3. 3. 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.
    4. 4. 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.
    5. 5. Peltier Effect Discover The efficiency by which a material is capable of generating power (Z) K thermal Conductivity - σ electrical Conductivity - S seebak coff.
    6. 6. Why does this Effect Occur? Charge Carrier Diffusion and Phonon Drag Peltier Effect Seebeck Effect
    7. 7. Thermoelectric Module
    8. 8. Applications Thermoelectric generator Cooling Computers Drink Coolers Recharging Devices Space Probes Solar Power Clothing
    9. 9. Video
    10. 10. 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 *
    11. 11. Thank You Questions ?