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Simulation of Regenerator in a Pulse Tube Refrigerator and Comparison of Performance in Two Conditions of Thermally Equilibrium and Thermally Non-Equilibrium

Ali Akbari Bidokhti, Amin | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48180 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan
  7. Abstract:
  8. Pulse tube refrigerator due to the relatively high efficiency, high reliability of linear compressor and the absence of moving parts in the cold area is known as one of the best options to generate up to one kW of cooling power at temperatures from 4 to 123 K. More recently, the use of the device at a temperature of about 150 K, makes use of it even outside of cryogenic temperature. The most important part of the device is regenerator, so understanding the nature of the flow and interaction of gas and solid network in the retrievers is necessary. In this study, Inertance pulse tube refrigerator (IPTR) is simulated using Ansys Fluent in two different conditions. In the first condition the regenerator is in local thermal equilibrium and in the second condition regenerator is in thermally non-equilibrium. The unique feature of this thesis is the comparison between the results of local thermal equilibrium and non-equilibrium conditions accompanied by high accuracy and precise calculation of heat transfer. Results of the simulation are compared with the values in the existing literature and shows good agreement. The flow inside the device as well as losses inside the regenerator are discussed. The simulation results shows that the use of local thermal equilibrium assumption may cause considerable error in the most parts inside regenerator and leads to wrong estimation of the overall cooling performance. So it is advisable to simulate the regenerator with local non-equilibrium thermal conditions
  9. Keywords:
  10. Pulse Tube Refrigrator ; Local Thermal Equilibrium ; Local Thermal Non-Equilibrium ; Regenerator ; Inertance Tube

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