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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

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

300 Hz thermoacoustically-driven pulse tube cooler

Stirling-type pulse tube coolers

Thermoacoustic generators

(including free piston Stirling generators)

slide5

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

The pulse tube cooler

The standing-wave engine

slide8

Heatingpower 2.1kW, Cooling power [email protected]℃,

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

operation, impedance match, etc

10 20w@80k relative carnot efficiency around 20 100 watt under development
10&[email protected], relative Carnot efficiency around 20%, >100 Watt under development

High efficiency Stirling-type pulse tube cooler

slide11

Thermoacoustic generators

Free piston Stirling generators

Thermoacoustic Stirling heat engine-based generators

Double effect thermoacoustic generators

free piston stirling 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

slide13

Free piston Stirling generators

100 Weclass 1kWe class, ~20%

thermal to electric efficiency

slide14

Double effects thermoacoustic generators

  • Engine set with heat exchangers, regenerator and thermal buffer tube
  • Linear motor with double effect
  • pistons
slide15

Double effects thermoacoustic generators

  • Best results so far: nearly 2 kWe with 18% thermalto electric efficiency
thermoacoustic stirling heat engine based generators
Thermoacoustic Stirling heat engine-based generators

TASHE loop

Resonance tube

Linear alternator

system details
System details

Engine Parameters:

Linear alternator Parameters:

numerical model
Numerical Model
  • Engine Model
  • Generator Model
slide19

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 )

slide20

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.

slide21

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).

experimental setup
Experimental setup

Resonance tube

TASHE loop

Linear alternator

experimental results
Experimental results

Best results:1 kWe output with 19%

thermal to electric efficiency

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