Electricity generator and other research in key laboratory of cryogenics of cas
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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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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

>10 graduate students

Research Activity:

Coolers based on thermoacoustic cycles, down to 20 K

Thermoacoustics engines and generators, from

100We-3kWe, target bigger


Typical Research

300 Hz thermoacoustically-driven pulse tube cooler

Stirling-type pulse tube coolers

Thermoacoustic generators

(including free piston Stirling generators)


Thermoacoustically-driven pulse tube coolers

Tc<80K

Heating


High frequency thermoacoustically-driven pulse tube coolers(300Hz)

The pulse tube cooler

The standing-wave engine


500W heating power,[email protected]


Traveling wave thermoacoustic engine driving traveling wave thermoacoustic cooler

Heating


Heatingpower 2.1kW, Cooling power 340W@-20℃,

[email protected] ℃, on-going research include high frequency

operation, impedance match, etc


10&[email protected], relative Carnot efficiency around 20%, >100 Watt under development

High efficiency Stirling-type pulse tube cooler


Thermoacoustic generators

Free piston Stirling generators

Thermoacoustic Stirling heat engine-based generators

Double effect thermoacoustic generators


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


Free piston Stirling generators

100 Weclass 1kWe class, ~20%

thermal to electric efficiency


Double effects thermoacoustic generators

  • Engine set with heat exchangers, regenerator and thermal buffer tube

  • Linear motor with double effect

  • pistons


Double effects thermoacoustic generators

  • Best results so far: nearly 2 kWe with 18% thermalto electric efficiency


Thermoacoustic Stirling heat engine-based generators

TASHE loop

Resonance tube

Linear alternator


System details

Engine Parameters:

Linear alternator Parameters:


Numerical Model

  • Engine Model

  • Generator Model


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 )


  • 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.


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).


Changing Piston diameter makes big difference


Changing Piston diameter makes big difference


Changing Piston diameter makes big difference


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


Experimental setup

Resonance tube

TASHE loop

Linear alternator


Experimental results

Best results:1 kWe output with 19%

thermal to electric efficiency


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


Thanks for your attention


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