Thermionic energy conversion (TEC) topping thermoelectrics
Long-respected international experts on thermoelectrics (Dixon, Ertl and Goldsmid supported by Ure) determine the probable maximum figure of merit (ZT) for fully matured thermoelectric generators as about unity from ordiary temperatures to 2000 K. Thus the maximum efficiency for fully matured thermoelectrics would be approximately 0.414 (l - r/sub T/)/(1.414 + r/sub T/) where r/sub T/ is the ratio of cold and hot junction temperatures. This limitation contrasts with the recent burst of enthusiasm for high-temperature thermoelectrics - based on calculated figures of merit and efficiencies that increase more and more rapidly with rising temperatures. Unfortunately these calculations neglect internal radiation effects which diminish thermoelectric figures of merit significantly at 1000 K and substantially at 2000 K: The effective thermal-conductivity contribution of intrathermoelectric radiative dissipation increases with the third power of temperature. Therefore the quotation from Thermoelectricy: Science and Engineering by Heikes and Ure apparently still prevails: ...thermoelectric devices appear difficult to extend in the direction of high temperature, while thermionic devices become inefficient at low temperature. Accordingly consideration of thermoelectric power generation with high-temperature heat sources should include utilization of TEC topping thermoelectrics. However TEC alone or TEC topping more-efficient conversion systems like steam or gas turbines, combined cycles or Stirling engines would be more desirable generally.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- DOE Contract Number:
- AI01-77ET13111
- OSTI ID:
- 6548190
- Report Number(s):
- DOE/NASA/1062-8; NASA-TM-81677; CONF-810527-1
- Resource Relation:
- Conference: International conference on plasma science, Sante Fe, NM, USA, 18 May 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
30 DIRECT ENERGY CONVERSION
COMBINED-CYCLE POWER PLANTS
TOPPING CYCLES
THERMIONIC CONVERTERS
THERMOELECTRIC GENERATORS
EFFICIENCY
BOTTOMING CYCLES
COST
GAS TURBINES
HIGH TEMPERATURE
PERFORMANCE
POWER DENSITY
POWER GENERATION
RADIANT HEAT TRANSFER
STIRLING ENGINES
TEMPERATURE DEPENDENCE
VERY HIGH TEMPERATURE
DIRECT ENERGY CONVERTERS
ENERGY TRANSFER
ENGINES
HEAT ENGINES
HEAT TRANSFER
MACHINERY
POWER PLANTS
THERMAL POWER PLANTS
THERMODYNAMIC CYCLES
TURBINES
TURBOMACHINERY
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