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Stirling Refrigeration

Stirling Refrigeration. ME 498 - Senior Laboratory November 16, 2004 Nicholas Taylor. Overview. Background and theory of the Stirling Cooler Experimental Set-up and Procedure Results. Objectives. Operate Global Cooling Model 100B Stirling Cooler

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Stirling Refrigeration

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  1. Stirling Refrigeration ME 498 - Senior Laboratory November 16, 2004 Nicholas Taylor

  2. Overview • Background and theory of the Stirling Cooler • Experimental Set-up and Procedure • Results

  3. Objectives • Operate Global Cooling Model 100B Stirling Cooler • Use thermodynamic principles to analyze the performance • Calculate COP, Qrejected, Qlifted

  4. Background • Model 100B free piston Stirling Cooler • High conversion between mechanical and thermal energy • AC linear motor drives the piston • Working gas – helium

  5. Background

  6. Theory • Coefficient of Performance

  7. Theory • Finding Qrejected

  8. Experimental Apparatus

  9. Procedure • Measure flow rate • Prepare data acquisition system • Increase voltage to the stirling cooler, to begin cooling • Record data until the temperature reaches -30°C, activate the heater and reach equilibrium at -20°C • Turn off equipment

  10. Results • Temperature vs. Time • COPR for 5°C, 0°C, -10°C, and -23°C • Compare COP found to COP from Global Cooling • COPR, Wstirling, and Qrejected at equilibrium • Compare COP at equilibrium with COPcarnot • Uncertainty Analysis

  11. Results

  12. Results

  13. Results

  14. Results

  15. Uncertainty • Uncertainty of COP • Uncertainty of Qlifted • Uncertainty of Qrejected • Uncertainty of Vdot

  16. Uncertainty • % ωCOP = 1.2% • ωQrejected = 4.61 (32.318) • ωVdot = 2.85E-8 • ωQlifted = 0.11 (12.204) • ωCOP = 6.18E-3 (.607)

  17. Uncertainty

  18. Conclusions • Learned a practical use of a Stirling Cooler • Found COP, Qrejected, and Qlifted • Found the uncertainty in measurements • Recommend comparing to a traditional refrigeration cycle

  19. References • http://www.globalcooling.com • http://132.235.18.152/seniorlab

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