Nitrogen heat pipe for cryocooler thermal shunt

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Description

A nitrogen heat pipe was designed, built and tested for the purpose of providing a thermal shunt between the two stages of a Gifford-McMahan (GM) cryocooler during cooldown. The nitrogen heat pipe has an operating temperature range between 63 and 123 K. While the heat pipe is in the temperature range during the system cooldown, it acts as a thermal shunt between the first and second stage of the cryocooler. The heat pipe increases the heat transfer to the first stage of the cryocooler, thereby reducing the cooldown time of the system. When the heat pipe temperature drops below the ... continued below

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10 p.

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Prenger, F.C.; Hill, D.D.; Daney, D.E.; Daugherty, M.A.; Green, G.F. & Roth, E.W. September 1, 1995.

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Description

A nitrogen heat pipe was designed, built and tested for the purpose of providing a thermal shunt between the two stages of a Gifford-McMahan (GM) cryocooler during cooldown. The nitrogen heat pipe has an operating temperature range between 63 and 123 K. While the heat pipe is in the temperature range during the system cooldown, it acts as a thermal shunt between the first and second stage of the cryocooler. The heat pipe increases the heat transfer to the first stage of the cryocooler, thereby reducing the cooldown time of the system. When the heat pipe temperature drops below the triple point, the nitrogen working fluid freezes, effectively stopping the heat pipe operation. A small heat leak between cryocooler stages remains because of axial conduction along the heat pipe wall. As long as the heat pipe remains below 63 K, the heat pipe remains inactive. Heat pipe performance limits were measured and the optimum fluid charge was determined.

Physical Description

10 p.

Notes

OSTI as DE95016912

Source

  • CEC/ICMC `95: cryogenic engineering conference and international cryogenic materials conference, Columbus, OH (United States), 17-21 Jul 1995

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  • Other: DE95016912
  • Report No.: LA-UR--95-2463
  • Report No.: CONF-950722--6
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 106480
  • Archival Resource Key: ark:/67531/metadc618568

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • September 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

Description Last Updated

  • June 23, 2016, 10:08 a.m.

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Prenger, F.C.; Hill, D.D.; Daney, D.E.; Daugherty, M.A.; Green, G.F. & Roth, E.W. Nitrogen heat pipe for cryocooler thermal shunt, article, September 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc618568/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.