Thermoelectrics Capabilities
CSIRO Materials Science and Engineering (CMSE)


Dr. Nick Savvides, Dr. Karl Müller, Dr. Haiy...
Motivation
                                                                            α 2σ
                  •    Figure ...
Materials Research

•  Aims of present work
       •  Prepare fine Mg2Si, Mg2Ge, Mg2Sn and their solid solutions
       • ...
Seebeck Coefficient


Compound               Literature      CSIRO
Mg2Si                  200 – 500 µV/K 330 – 350 µV/K

M...
Electrical Conductivity


     Dramatic increase in electrical conductivity with control of eutectic composition




CSIRO...
Theoretical Materials



Motivation
•  No theoretical limit to performance
•  Recent reports of experimental
   materials ...
Theoretical Materials

       Result
       •  CSIRO has a provisional patent on a novel material
          - offers high ...
Genset Waste Heat Recovery

                                        •  30 kW natural gas Genset
                          ...
TEG System in Construction




CSIRO. Thermoelectric Capabilities
Solar Thermoelectric Design and Analysis

•  Motivation: To design and evaluate solar thermoelectric
   systems suitable f...
Concentrating Solar Facilities




CSIRO. Thermoelectric Capabilities
DET Thermoelectric Activities

•  Engaging with major engineering company on feasibility of
   harnessing energy from the ...
Power Conditioning and Control

       Power generation
       •  Convert/invert voltage
       •  Need to find maximum po...
Applications

•  Medical hyperthermia/hypothermia
•  Energy conservation
•  Waste heat energy recovery
•  Sensing
•  Refri...
CSIRO Material Science and Engineering (CMSE)
Dr. Howard C Lovatt
Stream Leader - Energy Conversion Devices

Phone: +61 2 ...
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Thermoelectric research in CSIRO

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Outline of new materials research and applications for thermoelectrics at CSIRO

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Thermoelectric research in CSIRO

  1. 1. Thermoelectrics Capabilities CSIRO Materials Science and Engineering (CMSE) Dr. Nick Savvides, Dr. Karl Müller, Dr. Haiyan Chen, Jack Ling, Dr. Dong Chen, Sarah Miller, and Dr. Howard Lovatt
  2. 2. Motivation α 2σ •  Figure of merit for thermoelectrics ZT = T κ •  Current best materials have ZT ~1 •  Typical system efficiency 5 - 12% •  ZT ~ 2 would give up to 25% efficiency •  (For reference, current combustion engine efficiency ~25%!) 1.0 ZT: figure of merit Bi2Te3 0.8 PbTe 0.6 BiSb Si1 xGex 0.4 0.2 0.0 Room temperature 0 200 400 600 800 1000 1200 Temperature (K) CSIRO. Thermoelectric Capabilities
  3. 3. Materials Research •  Aims of present work •  Prepare fine Mg2Si, Mg2Ge, Mg2Sn and their solid solutions •  Characterize the microstructure, TE prop: α, σ, κ •  Optimize ZT by nanostructuring ….. •  Processing •  Ingots & single-crystals •  direct-melting, Bridgman method, zone-melting… •  Dense compacts: •  Reduction to nano-powders, mechanical alloying, hot pressing… •  Characterization •  Microstructure & composition: XRD, SEM, TEM, EDX… •  TE properties: Seebeck, resistivity, thermal conductivity …. •  Device assembly & testing….. CSIRO. Thermoelectric Capabilities
  4. 4. Seebeck Coefficient Compound Literature CSIRO Mg2Si 200 – 500 µV/K 330 – 350 µV/K Mg2Ge 200 – 700 220 – 360 Mg2Sn 20 – 115 135 – 188 αy Isotropy Mg2Sn αx CSIRO. Thermoelectric Capabilities
  5. 5. Electrical Conductivity Dramatic increase in electrical conductivity with control of eutectic composition CSIRO. Thermoelectric Capabilities
  6. 6. Theoretical Materials Motivation •  No theoretical limit to performance •  Recent reports of experimental materials with high ZT CSIRO. Thermoelectric Capabilities
  7. 7. Theoretical Materials Result •  CSIRO has a provisional patent on a novel material - offers high ZT ~10 Nanoparticle Electron Reservoir ~100 nm Molecular Quantum Dot 0D ~1 nm CSIRO. Thermoelectric Capabilities
  8. 8. Genset Waste Heat Recovery •  30 kW natural gas Genset •  Waste heat from exhaust 18kW •  Target electricity 500W •  FY 07/08: Demonstration unit Electric Output Expander +17kW Condenser Water Heater Boiler Thermoelectric 95°C -34kW +34kW -30kW 90°C 520°C 150°C 85°C +17kW Pump 5.4 L/min CSIRO. Thermoelectric Capabilities
  9. 9. TEG System in Construction CSIRO. Thermoelectric Capabilities
  10. 10. Solar Thermoelectric Design and Analysis •  Motivation: To design and evaluate solar thermoelectric systems suitable for urban, rural and remote locations •  Facilities and Capabilities: •  The National Solar Energy Centre in Newcastle has tracking solar collector systems including parabolic troughs and heliostat array. A solar dish is located at Lucas Heights •  The National Solar Energy Centre continuously records accurate local weather data for system analysis •  Design and analysis of solar thermal systems using the latest tools and techniques developed by, and in collaboration with, the international solar thermal community •  Multidisciplinary team of physicists, electrical, electronic, mechanical and chemical engineers with expertise in optics, fluid dynamics and thermodynamics CSIRO. Thermoelectric Capabilities
  11. 11. Concentrating Solar Facilities CSIRO. Thermoelectric Capabilities
  12. 12. DET Thermoelectric Activities •  Engaging with major engineering company on feasibility of harnessing energy from the environment, including a low temperature, non-concentrating, solar powered thermoelectric device ($70k) •  Performing an techno-economic appraisal of a solar thermoelectric trough concept •  Evaluating technologies for harnessing energy from the environment to power sensors. Literature review in progress CSIRO. Thermoelectric Capabilities
  13. 13. Power Conditioning and Control Power generation •  Convert/invert voltage •  Need to find maximum power point and convert/invert voltages CSIRO. Thermoelectric Capabilities
  14. 14. Applications •  Medical hyperthermia/hypothermia •  Energy conservation •  Waste heat energy recovery •  Sensing •  Refrigeration •  Solar thermal power generation CSIRO. Thermoelectric Capabilities
  15. 15. CSIRO Material Science and Engineering (CMSE) Dr. Howard C Lovatt Stream Leader - Energy Conversion Devices Phone: +61 2 9413 7412 Email: howard.lovatt@csiro.au Web: www.csiro.au Thank You Contact Us Phone: 1300 363 400 or +61 3 9545 2176 Email: Enquiries@csiro.au Web: www.csiro.au

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