Abstract
A new prototype of a G-M refrigerator with Vco = 13.3 cm3 is designed and tested. The experimental result of 2.9 K and 515 mW/4.2 K has been got at 60 rpm with the cool-down time of 100 minutes. The design principles and more information in detail are given in this paper.
The heat transfer from helium gas to the wall of the cold head, occurring in the gap between a cylinder and a displacer of a Gifford-McMahon refrigerator, is very important to the refrigeration. This process in the colder stage of a 4.2 K G-M refrigerator with magnetic material in the regenerator, is one of the dominant factors to the enhancement of the useful cooling capacity, because the thermal properties of helium in the range of temperature from 20 K to 4.2 K and pressure from 2.0 MPa to 0.7 MPa present dramatic change. A numerical analysis method considering the heat transfer together with the regenerator is suggested. The calculation results and some discussion are presented in this paper.
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© 1996 Plenum Press, New York
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Zhang, L., Gong, L.H., Xu, X.D. (1996). Study of Effect of Heat Transfer in the Cold Head to the Performance of a 4.2K G-M Refrigerator. In: Kittel, P. (eds) Advances in Cryogenic Engineering. A Cryogenic Engineering Conference Publication, vol 41. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0373-2_207
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DOI: https://doi.org/10.1007/978-1-4613-0373-2_207
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4613-8022-1
Online ISBN: 978-1-4613-0373-2
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