An alternative observation on the orifice pulse tube cryocooler and analysis through the unified model of cryocoolers |
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| Affiliation: | 1. Kyungpook National University, Daegu 41566, South Korea;2. Gwangju Insistitute of Science and Technology, Gwangju 61005, South Korea;3. Korea Basic Science Institute, Daejeon 34144, South Korea;4. Korea Electrotechnology Research Institute, Changwon 51543, South Korea;1. Centre for Cryogenic Technology, Indian Institute of Science, Bangalore 560012, India;2. Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore 560012, India;1. High-Temperature Superconducting Wire Group, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;2. Materials Analysis Station, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan |
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| Abstract: | A new observation of the orifice pulse tube (OPT) cryocooler is proposed and analyzed on the ground of the unified model of cryocoolers. The elementary temperature reduction mechanism is modeled and verified through the measurements of Mikulin and others. This analysis refers to the upper limit performance for zero phase shift between the pulses of pressure and flow rate at the cold end. The lowest attainable temperature is formulated and pointed out as central characteristics of an OPT cooler. It dominates the closed form expressions for cooler's cooling capacity, COP and FOM as function of the compression ratio, the size of regenerator, the species of coolant and average flow rate. The so obtained upper limit of COP and FOM is about half of that in literature. Performance is also compared with Solvay and Gifford-MaMahon cryocoolers. |
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| Keywords: | Pulse tube Unified model of cryocoolers Cryocoolers Cooling capacity |
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