Improvement of Two-Stage GM Refrigerator Performance Using a Hybrid Regenerator
To improve the performance of two-stage GM refrigerators, a hybrid regenerator with magnetic materials of Er3Ni and ErNi0.9Co0.1 was used in the 2nd stage regenerator because of its large heat exchange capacity. The largest refrigeration capacity achieved with the hybrid regenerator was 0.95W at helium liquefied temperature of 4.2K. This capacity is 15.9% greater than the 0.82W refrigerator with only Er3Ni as the 2nd regenerator material. Use of the hybrid regenerator not only increases the refrigeration capacity at 4.2K, but also allows the 4K GM refrigerator to be used with large 1st stage refrigeration capacity, thus making it more practical.
KeywordsHeat Load Regenerator Material Magnetic Refrigeration Hybrid Regenerator High Specific Heat
Unable to display preview. Download preview PDF.
- 2.H. Nakashima et al., Development of 4–5K cooler Stirling cycle refrigerator, in: “Proc. Forth Intl. Cryocoolers Conf.”, David Tailor Naval Ship RandD Center, Annapolis, MD (1986), p. 263Google Scholar
- 3.H. Yayama et al, Specific heat of regenerator material RNi2 system, IEEE Trans. Mag. Mag-23: 2850(1987)Google Scholar
- 4.R. Li et al, A new regenerator material Er(Nil„Cox)2 with high specific heat in the range from 4.2K and 15K, in: “Proc. Twelfth Intl. Cryo. Eng. Conf.”,Butterworth, Guild, UK (1988), p. 423Google Scholar
- 5.M. Sahashi et al, New magnetic material R3T system with extremely large heat capacities used as heat regenerators, in: “Advances in Cryogenic Engineering”, Vol. 35, Plenum Press, New York (1990), p. 1175Google Scholar
- 6.T. Kuriyama et al, High efficiency two-stage GM refrigerator with magnetic material in the liquid helium temperature region, in: “Advances in Cryogenic Engineering”, Vol. 35, Plenum Press, New York (1990),p. 1261Google Scholar
- 7.T. Kuriyama et al, Two-stage G-M refrigerator with Er3Ni regenerator material for helium liquefaction, in: “ Proc. Sixth Cryocooler Conf.” Vol. II(1991) p. 3Google Scholar
- 8.T. Hashimoto, Magnetic refrigeration and application of magnetic material to cryogenics (in Japanese), 1987, Kogyo-chosakai, TokyoGoogle Scholar
- 9.T. Hashimoto et al., Recent progress in the materials for regenerators in the range from 4.2K to 20K, in: “Proc. of ICMC”, Vol. 2, p. 667, 1988, Shenyang, China.Google Scholar
- 10.T. Hashimoto et al., An investigation of new magnetic materials used in cryogenics, to be submitted to Cryogenics.Google Scholar