000048104 001__ 48104
000048104 005__ 20210121114525.0
000048104 0247_ $$2doi$$a10.1103/PhysRevApplied.3.051001
000048104 0248_ $$2sideral$$a91929
000048104 037__ $$aART-2015-91929
000048104 041__ $$aeng
000048104 100__ $$aRillo, Conrado
000048104 245__ $$aEnhancement of the Liquefaction Rate in Small-Scale Helium Liquefiers Working Near and Above the Critical Point
000048104 260__ $$c2015
000048104 5060_ $$aAccess copy available to the general public$$fUnrestricted
000048104 5203_ $$aLow-temperature research laboratories with typical liquid-helium consumption of the order of tens of liters per day have greatly benefited from the recent development of small-scale liquefiers. In general, these liquefiers are based on Gifford-McMahon or pulse-tube closed-cycle refrigerators with a nominal cooling power ranging from 1 to 1.5Wat 4.2 K. The liquefaction rate for these cryocooler-based liquefiers depends on the pressure at which the helium is liquefied, although the final user conditions of the produced liquid helium are always atmospheric pressure and boiling temperature (e.g., 4.2 K at 100 kPa). Here, we show a systematic study on this effect, in which an enhancement in excess of 70% in liquefaction rate is found experimentally for pressures near and above the critical point of helium (220 kPa). We propose that the underlying mechanism for the liquefaction enhancement is based on the increase in cryocooler cooling power with temperature and the decrease of the helium enthalpy with pressure.
000048104 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/IPT-2012-0442-420000
000048104 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000048104 590__ $$a4.061$$b2015
000048104 591__ $$aPHYSICS, APPLIED$$b22 / 145 = 0.152$$c2015$$dQ1$$eT1
000048104 592__ $$a2.345$$b2015
000048104 593__ $$aPhysics and Astronomy (miscellaneous)$$c2015$$dQ1
000048104 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000048104 700__ $$aGabal, Miguel
000048104 700__ $$0(orcid)0000-0001-7659-3963$$aLozano Bernal, María Pilar$$uUniversidad de Zaragoza
000048104 700__ $$0(orcid)0000-0002-7742-9329$$aSesé, Javier$$uUniversidad de Zaragoza
000048104 700__ $$aSpagna, Stefano
000048104 700__ $$aDiederichs, Jost
000048104 700__ $$aSager, Ronald
000048104 700__ $$aChialvo, Cesar
000048104 700__ $$aTerry, Jeremy
000048104 700__ $$aRayner, Grant
000048104 700__ $$aWarburton, Richard
000048104 700__ $$aReineman, Richard
000048104 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada
000048104 773__ $$g3 (2015), 051001 [5 pp]$$pPhys. rev. appl.$$tPhysical Review Applied$$x2331-7019
000048104 8564_ $$s269916$$uhttps://zaguan.unizar.es/record/48104/files/texto_completo.pdf$$yVersión publicada
000048104 8564_ $$s112661$$uhttps://zaguan.unizar.es/record/48104/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000048104 909CO $$ooai:zaguan.unizar.es:48104$$particulos$$pdriver
000048104 951__ $$a2021-01-21-11:05:42
000048104 980__ $$aARTICLE