A cryocooler that consists of a two-stage Gifford-McMahon (GM) mechanical refrigerator and a Joule-Thomson (JT) expansion circuit is developed for use in resistance thermometer calibration. The cryocooler is designed to attain a lower temperature rather than to produce a higher cooling power. A simple but high-performance counterflow heat exchanger is developed for the cryocooler. The heat exchanger has a high flow conductance while maintaining a high heat exchange efficiency. It is an improved type of counterflow heat exchanger composed of a spiral capillary and a thin-wall straight outer tube. The developed cryocooler uses a single counterflow heat exchanger not like a conventional GM/JT cryocooler, which usually has two or three counterflow heat exchangers. is used as the working fluid for the JT expansion circuit. The pot where the condensed collects after the JT expansion can reach in the continuous operation mode and in the single-cycle operation mode. The cooling power of the cryocooler is at with a molar flow rate of . Temperature control of the pot was demonstrated from using two control methods. One method involves controlling the evacuation speed in the JT circuit and the other involves controlling the heat input from a heater to the pot. The temperature of the pot is controlled within the order of magnitude of from peak to peak with either method.
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March 2006
Research Article|
March 28 2006
Gifford-McMahon/Joule-Thomson cryocooler with high-flow-conductance counterflow heat exchanger for use in resistance thermometer calibration Available to Purchase
Takeshi Shimazaki;
Takeshi Shimazaki
National Metrology Institute of Japan (NMIJ),
National Institute of Advanced Industrial Science and Technology (AIST)
, Tsukuba Central 3, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
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Keishi Toyoda;
Keishi Toyoda
National Metrology Institute of Japan (NMIJ),
National Institute of Advanced Industrial Science and Technology (AIST)
, Tsukuba Central 3, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
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Osamu Tamura
Osamu Tamura
National Metrology Institute of Japan (NMIJ),
National Institute of Advanced Industrial Science and Technology (AIST)
, Tsukuba Central 3, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
Search for other works by this author on:
Takeshi Shimazaki
National Metrology Institute of Japan (NMIJ),
National Institute of Advanced Industrial Science and Technology (AIST)
, Tsukuba Central 3, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
Keishi Toyoda
National Metrology Institute of Japan (NMIJ),
National Institute of Advanced Industrial Science and Technology (AIST)
, Tsukuba Central 3, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
Osamu Tamura
National Metrology Institute of Japan (NMIJ),
National Institute of Advanced Industrial Science and Technology (AIST)
, Tsukuba Central 3, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, JapanRev. Sci. Instrum. 77, 034902 (2006)
Article history
Received:
December 26 2005
Accepted:
February 13 2006
Citation
Takeshi Shimazaki, Keishi Toyoda, Osamu Tamura; Gifford-McMahon/Joule-Thomson cryocooler with high-flow-conductance counterflow heat exchanger for use in resistance thermometer calibration. Rev. Sci. Instrum. 1 March 2006; 77 (3): 034902. https://doi.org/10.1063/1.2185498
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