A helium liquefier has been developed with a Gifford-McMahon cryocooler using the cold enthalpy available at the first stage, the inter-stage, and the second stage of the cryocooler. Most of the enthalpy of the helium gas at 300 K is absorbed in the first stage by a coaxial heat exchanger and inter-stage region of the cryocooler. Pre-cooled helium gas is liquefied at the second stage heat exchanger where the final cooldown and condensation happens. The measured production capacity of the liquefier is 17.4 l/day at atmospheric pressure. The whole setup has been designed to work in a coaxial configuration where the two heat exchangers, the cryostat, and the dewar are symmetrically placed around the central axis.
REFERENCES
1.
G.
Thummes
, C.
Wang
, and C.
Heiden
, “Small scale 4He liquefaction using a two-stage 4 K pulse tube cooler
,” Cryogenics
38
(3
), 337
(1998
).2.
C.
Wang
, “Helium liquefaction with a 4 K pulse tube cryocooler
,” Cryogenics
41
, 491
(2001
).3.
C.
Wang
and R. G.
Scurlock
, “Improvement in performance of cryocoolers as condensers
,” Cryogenics
48
, 169
(2008
).4.
N.
Masashi
, I.
Takashi
, Y.
Hideto
et al., “Helium liquefaction by a Gifford-McMahon cycle cryocooler
,” Adv. Cryog. Eng.
35B
, 1251
–1260
(1990
).5.
P.
Schmidt-Wellenburg
and O.
Zimmer
, “Helium liquefaction with a commercial 4 K Gifford-McMahon cryocooler
,” Cryogenics
46
(11
), 799
–803
(2006
).6.
X.
Dong
, L. H.
Gong
, and L. F.
Li
, “A self-circulation helium liquefaction system with five 4 K G-M cryocoolers
,” Cryogenics
51
, 331
–336
(2011
).7.
D.
Xu
, L. H.
Gong
, and L. F.
Li
, “Experimental investigation and optimization of small-scale helium liquefaction with multi-cryocoolers
,” Cryogenics
69
, 10
–17
(2015
).8.
A.
Ravex
, T.
Trollier
, J.
Tanchon
, and T.
Prouvé
, “Increase in performance of 4 K pulse tube cryocooler
,” in Proceedings of the Cryo Prague 2006/ICEC
(International Institute of Refrigeration (IIR)
, 2006
), Vol. 21, pp. 515
–524
.9.
C.
Wang
, “Intermediate cooling from pulse tube and regenerator in a 4 K pulse tube cryocooler
,” Cryogenics
48
, 154
–159
(2008
).10.
Y.
Hiroshi Asami
and H.
Mitsuru Suzuki
, “Refrigerator having regenerator
,” U.S. patent 5,481,879 (09 September 1996).11.
VDI Heat Atlas
, 2nd ed. (Springer, 2010), pp. 673
–677
.© 2017 Author(s).
2017
Author(s)
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