21-02-2010, 11:03 PM
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THERMOELECTRIC POWER GENERATOR
INTRODUCTION
ENERGY
THERMOELECTRICITY AND TEG
WASTE HEAT HARVESTING
HISTORY
TEG
COMBINATION OF UNITS OF TE MODULES
THERMAL TO ELECTRICAL
BASIC PRINCIPLE
PRINCIPLE
SEEBECK EFFECT, PELTIER EFFECT AND THOMSON EFFECT.
WORKING MECHANISM OF A THERMOCOUPLE.
Constrution
HEAT SOURCE - FROM WHICH HEAT IS DRAWN
HEAT SINK - COLD RESERVOIR TO WHICH HEAT IS DISSIPATED
PAIR OF THEMOCOUPLES - BASED ON TE ELEMENTS
LOAD RESISTANCE - RL
HEAT FROM EXTERNAL SOURCE “ Q
OUTPUT POWER - P
ONE TEG MODULE “ MANY PAIRS OF THERMOCOUPLES BASED ON BISMUTH TELLURIDE
HEAT SOURCE
HEAT SINK WITH FINS
EQUIVALENT RESISTOR NETWORK
WORKING
HEAT EXCHANGER “ HOT SIDE
HEAT SINK WITH FINS “ COLD SIDE
DIFFERENCE IN TEMPERATURE ACROSS THERMOCOUPLES
POTENTIAL DIFFERENCE ACROSS THERMOCOUPLE
CURRENT FLOW THROUGH THERMOCOUPLE AND LOAD RESISTOR
POWER IS DEVELOPED
EXPERIMENT
ON EXHAUST PIPE OF TOYOTA STARLET
COMMERCIAL BISMUTH TELLUTIDE MODULE WITH 31 THERMOCOUPLES
ALL BONDED AT 4MPa
LOAD RESISTOR 0.45O
CONDUCTED BY PROVIDING BOTH SIMULATED AND REAL ROAD CONDITIONS
RESULTS ALMOST SIMILAR FOR BOTH
ADVANTAGES AND DISADVANTAGES
ADVANTAGES
DECREASE PETROLEUM CONSUMPTION
RECYCLE WASTE ENERGY INTO USEFUL POWER
REDUCES POWER LOSS
IMPROVE EFFICIENCY OF AUTOMOBILES
DISADVANTAGES
TE MATERIAL IS EXPENSIVE
STRUCTURAL FAILURE OF TE ELEMENT AT HIGH TEMPERATURES
ELECTRICAL RESISTIVITY INCREASES
FIGURE OF MERIT ËœZâ„¢ REDUCES
FURTHER DEVELOPMENT
NANOCRYSTALLINE APPROACH IMPROVES ËœZâ„¢
HIGH PERFORMANCE AND LOW COST COULD BE BROUGHT
CONCLUSION
SIMULATIONS AND EXPERIMENTS HAS BEEN CONDUCTED AND MORE EFFICIENT SYSTEMS CAN BE DEVELOPED IN FUTURE WITH NANOCYSTALLINE APPROACH.
