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• W3178850562 abstract "Large cooling capacity regenerative cryocoolers working at 20 K is indispensable in developing superconducting technology and hydrogen energy systems. Two-stage Stirling cryocooler is promising for its advantages such as large cooling capacity, high efficiency, fast cool-down process, and compact configuration. A two-stage large cooling capacity Stirling cryocooler is designed and numerically studied. The influence of the main parameters of the regenerators and working conditions on the cooling performance is discussed. Acoustic field distribution in the cryocooler is revealed for a deep understanding of the internal working mechanism. The performance of the cryocooler, including the available energy losses and cooling capacity, is systematically analyzed. it is found that the phase of the pressure wave always leads the volumetric flow rate in the two regenerators of the cryocooler, which is quite different from the general view. The ambient heat exchanger causes the most substantial part of available energy losses. Under the mean pressure of 3 MPa, a no-load refrigeration temperature of 11.81 K is achieved while the temperature of the first stage is 46.02 K. With no heat load on the first stage, the cryocooler is capable of providing 147 W cooling power at 20 K with a relative Carnot efficiency of 27.2%. When the two stages work at 77 K and 20 K respectively, the cryocooler can simultaneously provide 274.8 W cooling power at the first stage and 130.2 W cooling power at the second stage, with an exergy efficiency of 0.346." @default.
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• W3178850562 date "2021-09-01" @default.
• W3178850562 modified "2023-10-16" @default.
• W3178850562 title "Numerical study on a two-stage large cooling capacity stirling cryocooler working at 20 K" @default.
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• W3178850562 doi "https://doi.org/10.1016/j.cryogenics.2021.103334" @default.
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