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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.

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Presentation on theme: "Electricity Generator and Other Research in Key Laboratory of Cryogenics of CAS Wei Dai Technical Institute of Physics and Chemistry, Chinese Academy of."— Presentation transcript:

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 Tc<80K Heating Thermoacoustically-driven pulse tube coolers

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

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

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

12 Free piston Stirling generators 1.Hot heat exchanger 2.Regenerator 3.Ambient heat exchanger 4.Linear motor 5. Mechanical spring 6. Backside volume 7.Expansion space 8.Displacer 9.Compression space 10.Power piston

13 Free piston Stirling generators 100 We class 1kWe class, ~20% thermal to electric efficiency

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

15 Double effects thermoacoustic generators Best results so far: nearly 2 kWe with 18% thermal to electric efficiency

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

17 System details Engine Parameters: 17 Feedback tube Main ambient HX regeneratorHeater block Thermal buffer tube Secondary ambient HX Resonance tube Length (m) 1.550.050.080.060.240.024.45+1.0 Diameter (m) 0.10.08-0.3 D mm τ N/A K N/mm M kg R mech N·s/m L s mH rΩrΩ RΩRΩ 601021710.93152643.760 Linear alternator Parameters:

18 Numerical Model 18 Engine Model Generator Model

19 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

20 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

21 Changing the natural frequency of the linear alternator makes big difference ( adjusting the moving mass) 21 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 o C heating temperature and 15 o C cooling water temperature). The system stops working in this natural frequency range. 6cm piston

22 Changing Piston diameter makes big difference 22

23 23 Changing Piston diameter makes big difference

24 24 Changing Piston diameter makes big difference

25 Changing the engine frequency makes big difference (mixing Argon with Helium) 25

26 Experimental setup 26 TASHE loop Linear alternator Resonance tube

27 27 Experimental results Best results 1 kWe output with 19% thermal to electric efficiency

28 Solar-powered version, set up in Shen Zhen, China 28

29 Thanks for your attention


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