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TWO-STAGE GIFFORD-MCMAHON CYCLE CRYOREFRIGERATOR OPERATING AT 20 K.

Author(s) : THIRUMALESHWAR M., SUBRAMANYAM S. V.

Type of article: Article

Summary

A TWO-STAGE GIFFORD-MCMAHON CYCLE CRYOREFRIGERATOR OPERATING AT 20 K IS DESCRIBED. IT USES A VERY SIMPLE < SPOOL VALVE > AND A MODIFIED INDIGENOUS COMPRESSOR TO COMPRESS HELIUM GAS. THIS CRYOREFRIGERATOR REACHES A LOWEST TEMPERATURE OF 15.5 K ; IT TAKES ABOUT 50 MIN TO REACH 20 K AND THE COOLING CAPACITY IS 2.5 W AT 25 K. THE COOL-DOWN CHARACTERISTICS AND LOAD CHARACTERISTICS ARE PRESENTED IN GRAPHICAL FORM. THE EFFECT OF CHANGING THE OPERATING PRESSURE RATIO AND THE SECOND STAGE REGENERATOR MATRIX SIZE ARE ALSO REPORTED. PRESSURE-VOLUME (P-V) DIAGRAMS OBTAINED AT VARIOUS TEMPERATURES INDICATE THAT P-V LOSSES FORM THE MAJOR FRACTION OF THE TOTAL LOSSES AND THIS BECOMES MORE PRONOUNCED AS THE TEMPERATURE IS DECREASED.

Details

  • Original title: TWO-STAGE GIFFORD-MCMAHON CYCLE CRYOREFRIGERATOR OPERATING AT 20 K.
  • Record ID : 1987-0828
  • Languages: English
  • Source: Cryogenics - vol. 26 - n. 10
  • Publication date: 1986

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