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Introduction & Overview of Thermoelectric generator by chaudhari m.m

In recent years due to energy issues has brought in major interest to the research of advanced technology perticularly in I.C engines.

The growing rate of population indicates that the energy demand is likely to increase substantial thermal energy available from exhaust gas in modern automotive engines.

Two-third of the energy from combustion in vehicle is lost as waste heat.

The 40 % lost energy is in the form of exhaust gas.

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Introduction & Overview of Thermoelectric generator by chaudhari m.m

  1. 1. By:- Prof- Chaudhari M.M (Dept. Of Mechanical Engg.) Nashik (Maharashtra) Thermoelectric Generator
  2. 2. CONTENTS Introduction Seebeck effect Thermoelectric material Thermoelectric generator Working principle Figure of merit Advantages Disadvantages Application Conclusion References C O N T E N T S
  3. 3. • In recent years due to energy issues has brought in major interest to the research of advanced technology perticularly in I.C engines. • The growing rate of population indicates that the energy demand is likely to increase substantial thermal energy available from exhaust gas in modern automotive engines. • Two-third of the energy from combustion in vehicle is lost as waste heat. • The 40 % lost energy is in the form of exhaust gas. INTRODUCTION
  4. 4. HISTORY The pioneer in thermoelectrics was a German scientist Thomas Johann Seebeck (1770-1831). Thermoelectricity refers to a class of phenomena in which a temperature difference creates an electric potential or an electric potential creates a temperature difference. Thermoelectric power generator is a device that converts the heat energy into electrical energy based on the principles of Seebeck effect.  Later, In 1834, French scientist, Peltier and in 1851, Thomson (later Lord Kelvin) described the thermal effects on conductors.
  5. 5. Seebeck effect S= dV / dT; In 1821, Thomas Seebeck found that an electric current would flow continuously in a closed circuit made up of two dissimilar metals, if the junctions of the metals were maintained at two different temperatures. S is the Seebeck Coefficient with units of Volts per Kelvin S is positive when the direction of electric current is same as the direction of thermal current
  6. 6. When the junctions of two different metals are maintained at different temperature, the emf is produced in the circuit This is known as Seebeck effect.  The conductor 1 is maintained at T+∆T temperature  The conductor 2 is maintained at temperature T  Since the junctions are maintained at different temperature, the emf ‘U’ flows across the circuit. Cont.…..
  7. 7. • • Thermoelectric material The good thermoelectric materials should possess Large Seebeck coefficients High electrical conductivity Low thermal conductivity The example for thermoelectric materials Bismuth Telluride (Bi2Te3) Lead Telluride (PbTe) Silicon Germanium (SiGe) Bismuth- Antimony (Bi-Sb)
  8. 8. Thermoelectric generator
  9. 9. Basic Working Principle
  10. 10. • A high electrical conductivity is necessary to minimize Joule heating and low thermal conductivity helps to retain heat at the junctions and maintain a large temperature gradient. These three properties were later put together and it is called figure-of-merit (Z). • Figure of merit Z= α2 / k R Figure of merit
  11. 11. • Environmental friendly • Recycles wasted heat energy • Scalability ,meaning that the device can be applied to any size heat source from a water heater to a manufacturers equipment • Reliable source of energy • Lowers production cost • Silent in operation • They are simple , compact and safe • They are not position dependent Advantages
  12. 12. Low energy conversion efficiency rate Slow technology progression Limited applications Requires Relatively constant heat source Lack of customer/industry education about thermoelectric generators Disadvantage
  13. 13. The TEG is used to convert the waste heat emitted from jet engine, IC engine, furnace, heat water conveyor tubes. For low power remote application. ( where bulkier heat engines would not be possible) On gas pipelines for CATHODIC protection for example: global thermoelectric(CALGARA , CANADA) TELGEN (Russia) Automotive TEGs Applications
  14. 14. CONCLUSION  Thermoelectric material have both high electrical conductivity and low thermal conductivity  The output voltage increases with increase in temperature difference  Longitudinal model indicates performance improvement of TEG
  15. 15. • Dipak Patil,Dr.R.R.Arakerimath,“A review of thermoelectric generator for waste heat recovery from engine exhaust”,Int. Journal of research in aeronautical & mechanical engineering,Vol.1Issue.8,Dec 2013. • Saniya Leblanc,“Thermoelectric Generators: linking material properties and systems engineering for waste heat recovery applications”,sustainable materials and technologies 1-2(2014) 26-35. • S.L.Nadaf,P.B.Gangavati,“A Review on waste heat recovery and utilization from diesel engines”,Nadaf et al. Int. journal of advanced engineering technology E- ISSN 0976-3945. • Prathamesh Ramade,Prathamesh Patil,Manoj Shelar,Sameer Chaudhary, Prof. Shivaji Yadav,Prof.Santosh Trimbake,“Automobile Exhaust thermo-electric generator design& performance analysis”,Int. journal of Emerging technology and advanced engineering,Vol.4,Issue5,may 2014. • A.Jacks delightus Peter,Balaji.D,D.Gaurishankar,“waste heat energy harvesting using thermoelectric generator”,IOSR Journal of engineering(IOSRJEN) vol-3 Issue7(July-2013),PP 01-04. REFERNCES
  16. 16. THANK YOU

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