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팽창과정에서의 터보엑스펜더 영향에 관한연구 Effect of a Turbo Expander for Regeneration in the Expansion Process

팽창과정에서의 터보엑스펜더 영향에 관한연구 Effect of a Turbo Expander for Regeneration in the Expansion Process. 2006. 12. 06. Chong-Hyun Cho (Gyeongsang National University, Korea). Introduction of Laboratory.

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팽창과정에서의 터보엑스펜더 영향에 관한연구 Effect of a Turbo Expander for Regeneration in the Expansion Process

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  1. 팽창과정에서의 터보엑스펜더 영향에 관한연구Effect of a Turbo Expander for Regeneration in the Expansion Process 2006. 12. 06 Chong-Hyun Cho(Gyeongsang National University, Korea)

  2. Introduction of Laboratory Directe ProfessorSOO YOUNG CHOA Field of StudyTurbomachinery and Energy ConversionOptimization using CFDMicro Rotating MachinesWind Tunnel testNoise and Vibration MeasurementLocation403-410, 403-408, 404-203, Wind Tunnel building

  3. Motive Using a turbo expander

  4. Expansion (R134a) Before expansion After expansion Two-phase state

  5. Expander analysis • Basic configurations • Matching with nozzle exit velocity • Tip diameter by the rotational speed • Number of blades • Decide turbine efficiency • Optimum hub diameter (flow quality is changed within the • passage) etc. • Blade design • Impulse blade • Internal flow analysis

  6. an axial type small turbine and single stage nozzle angle was a 74° Experiment (Verneau)

  7. Expander Analysis : 50RT Output power : 2.30 kW(heating), 1.81kW(cooling) Torque : 2.50 Nm(heating), 2.46 Nm(cooling) Outer Dia. : 103.3mm Inner Dia. : 67.3mm Partial Admission : 19.96% Rate Rotational Speed : 8763 RPM(heating), 7041 RPM(cooling)

  8. Operating condition : Exp. 9.25RT (DBC 503T-28,000kcal/hr) 50RT model : 1/5-1/6 Size Mass flowrate : 0.25kg/sec Expansion (low RPM) : 11~16bar, 4~6bar Expansion (high RPM) : 16~18bar, 4~7bar

  9. 실험장치

  10. Exp. Apparatus

  11. Nozzle Design Assumptions : 1-D, homogenous flow Assumptions : nozzle flow isentropic Pressure eq.

  12. Nozzle Design Location chock Pressure gradient at chock location Assumptions : Al nozzle, roughness 0.2mm

  13. Nozzle Inlet Diameter : 8.0mm Throat Diameter : 3.6mm Exit Diameter : 5.8mm Nozzle Length : 57.8mm

  14. Design of Turbo Expander • Supersonic turbine: • Min. shockloss • Max. utilization factor • Impulse turbine

  15. Turbine Design

  16. Turbo Expander

  17. Rotor Specifications

  18. Manufacturing EX

  19. Manufacturing EX

  20. Manufacturing EX

  21. Manufacturing EX

  22. Manufacturing EX

  23. Manufacturing EX

  24. Manufacturing EXEnjoy R/C helicopter air show

  25. Summary A turbo expander is installed in the expansion process instead of expansion V/V. It recovered 0.37kJ/kg on the 9.25RT experimental utility. Efficiency increases according to the pressure ratio Efficiency drops linearly 3.7% between shroud and un-shroud rotor Experimental study is very important exact manufacturing of test system Specially, micro rotating machine required manufacturing quality is 0.001mm

  26. Thank you for your attentions

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