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Electricity Generator and Other Research in Key Laboratory of Cryogenics of CAS

Electricity Generator and Other Research in Key Laboratory of Cryogenics of CAS. Wei Dai Technical Institute of Physics and Chemistry, Chinese Academy of Sciences ， Beijing ， China. Our group. The group members: Prof. Ercang Luo and Wei Dai 5 other staff members

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Electricity Generator and Other Research in Key Laboratory of Cryogenics of CAS

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  1. Electricity Generator and Other Research in Key Laboratory of Cryogenics of CAS Wei Dai Technical Institute of Physics and Chemistry, Chinese Academy of Sciences，Beijing， China

  2. Our group The group members: Prof. Ercang Luo and Wei Dai 5 other staff members >10 graduate students Research Activity: Coolers based on thermoacoustic cycles, down to 20 K Thermoacoustics engines and generators, from 100We-3kWe, target bigger

  3. Typical Research 300 Hz thermoacoustically-driven pulse tube cooler Stirling-type pulse tube coolers Thermoacoustic generators （including free piston Stirling generators）

  4. Thermoacoustically-driven pulse tube coolers Tc<80K Heating

  5. High frequency thermoacoustically-driven pulse tube coolers（300Hz） The pulse tube cooler The standing-wave engine

  6. 500W heating power，1W@80K

  7. Traveling wave thermoacoustic engine driving traveling wave thermoacoustic cooler Heating

  8. Heatingpower 2.1kW, Cooling power 340W@-20℃， 410W@0 ℃, on-going research include high frequency operation, impedance match, etc

  9. 10&20W@80K, relative Carnot efficiency around 20%, >100 Watt under development High efficiency Stirling-type pulse tube cooler

  10. Thermoacoustic generators Free piston Stirling generators Thermoacoustic Stirling heat engine-based generators Double effect thermoacoustic generators

  11. Free piston Stirling generators 1.Hot heat exchanger 2.Regenerator3.Ambient heat exchanger 4.Linear motor 5. Mechanical spring 6. Backside volume 7.Expansion space 8.Displacer9.Compression space10.Power piston

  12. Free piston Stirling generators 100 Weclass 1kWe class, ~20% thermal to electric efficiency

  13. Double effects thermoacoustic generators • Engine set with heat exchangers, regenerator and thermal buffer tube • Linear motor with double effect • pistons

  14. Double effects thermoacoustic generators • Best results so far: nearly 2 kWe with 18% thermalto electric efficiency

  15. Thermoacoustic Stirling heat engine-based generators TASHE loop Resonance tube Linear alternator

  16. System details Engine Parameters: Linear alternator Parameters:

  17. Numerical Model • Engine Model • Generator Model

  18. Comparison of the model with RC load to measure output Computational and experimental data of the TASHE (4MPa helium,75Hz working frequency, 650℃ heating temperature )

  19. When it comes to a linear alternator, frequency coupling between the system working frequency (dominated by the engine) and the natural frequency of the linear alternator (dominated by its spring stiffness, moving mass, piston area) is crucial to the system performance.

  20. 6cm piston • Changing the natural frequency of the linear alternator makes big difference ( adjusting the moving mass) The system stops working in this natural frequency range. Computational results of power and pressure ratio as a function of the natural frequency of linear alternator (6cm piston diameter, 4.0 MPa helium, 650 oC heating temperature and 15 oC cooling water temperature).

  21. Changing Piston diameter makes big difference

  22. Changing Piston diameter makes big difference

  23. Changing Piston diameter makes big difference

  24. Changing the engine frequency makes big difference (mixing Argon with Helium)

  25. Experimental setup Resonance tube TASHE loop Linear alternator

  26. Experimental results Best results：1 kWe output with 19% thermal to electric efficiency

  27. Solar-powered version, set up in Shen Zhen, China

  28. Thanks for your attention

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