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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

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
Our group of Cryogenics of CAS

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
Typical Research of Cryogenics of CAS

300 Hz thermoacoustically-driven pulse tube cooler

Stirling-type pulse tube coolers

Thermoacoustic generators

(including free piston Stirling generators)


Thermoacoustically-driven pulse tube coolers of Cryogenics of CAS

Tc<80K

Heating


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

The pulse tube cooler

The standing-wave engine


500w heating power 1w@80k
500W heating power of Cryogenics of CAS,[email protected]



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

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

operation, impedance match, etc



Thermoacoustic generators under development

Free piston Stirling generators

Thermoacoustic Stirling heat engine-based generators

Double effect thermoacoustic generators


Free piston stirling generators
Free piston Stirling generators under development

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 under development

100 Weclass 1kWe class, ~20%

thermal to electric efficiency


Double effects thermoacoustic generators under development

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

  • Linear motor with double effect

  • pistons


Double effects thermoacoustic generators under development

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


Thermoacoustic stirling heat engine based generators
Thermoacoustic Stirling heat engine-based generators under development

TASHE loop

Resonance tube

Linear alternator


System details
System details under development

Engine Parameters:

Linear alternator Parameters:


Numerical model
Numerical Model under development

  • Engine Model

  • Generator Model


Comparison of the model with RC load to measure under development

output

Computational and experimental data of the TASHE

(4MPa helium,75Hz working frequency, 650℃ heating temperature )



6cm piston between the system working frequency (

  • 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 between the system working frequency (


Changing piston diameter makes big difference1
Changing Piston diameter makes big difference between the system working frequency (


Changing piston diameter makes big difference2
Changing Piston diameter makes big difference between the system working frequency (



Experimental setup
Experimental setup Argon with Helium)

Resonance tube

TASHE loop

Linear alternator


Experimental results
Experimental results Argon with Helium)

Best results:1 kWe output with 19%

thermal to electric efficiency



Thanks for your attention
Thanks for your attention Argon with Helium)


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