Conveners
Tue-Mo-Orals Session 2: Joule-Thomson cryocoolers
- John WEISEND (SLAC)
Dr
Jaroslaw POLINSKI
(PWR)
08/07/2014, 11:00
C-02: Cryocoolers- Pulse tube, Stirling, Magnetic and other coolers
Invited Oral (30min)
Nowadays the worldwide market of He3 isotope is under strong crisis. The new technologies of radiological and nuclear materials detectors as well as science, industrial and medicine applications required a large amount of this helium isotope. On the other hand, a production of the nuclear weapon, which 3He is a by-product, is successively reduced last decades. Therefore to meet the 3He market...
Prof.
Maoqiong Gong
(Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
08/07/2014, 11:30
C-02: Cryocoolers- Pulse tube, Stirling, Magnetic and other coolers
Oral presentation (15min)
The mixed-gases Joule-Thomson (J-T) refrigerator driven by oil-lubricated compressor has many merits, such as high reliability, low cost, high efficiency with optimized design. For many applications, the size and weight are crucial factors for the system design. Miniature J-T coolers, especially those open cycle coolers using high-pressure pure nitrogen for infrared devices cooling, have...
Yingzhe Wu
(University of Twente)
08/07/2014, 11:45
C-02: Cryocoolers- Pulse tube, Stirling, Magnetic and other coolers
Oral presentation (15min)
METIS is the ‘Mid-infrared ELT Imager and Spectrograph’ for the European Extremely Large Telescope that will cover the thermal/mid-infrared wavelength range from 3 – 14 micron. Starting from a pumped nitrogen line at 70K, it requires cryogenic cooling of detectors and optics at 40K (1.4 W), 25K (1.1 W), and 8K (0.4 W). A vibration-free cooling technology for this instrument based on sorption...
Dr
Agnieszka Piotrowska
(Wroclaw University of Technology)
08/07/2014, 12:00
C-02: Cryocoolers- Pulse tube, Stirling, Magnetic and other coolers
Oral presentation (15min)
Joule-Thomson (J-T) cryo-coolers working in closed cycles and supplied with gas mixtures are the subject of intensive research in different laboratories. The replacement of pure nitrogen by nitrogen-hydrocarbon mixtures allows to improve both thermodynamic parameters and economy of the refrigerators. It is possible to avoid high pressures in the heat exchanger and to use standard...
Dr
Haishan Cao
(University of Twente)
08/07/2014, 12:15
C-02: Cryocoolers- Pulse tube, Stirling, Magnetic and other coolers
Oral presentation (15min)
A major issue in long-term operation of micromachined Joule-Thomson coolers is the clogging of the microchannels and/or the restriction due to the deposition of water molecules present in the working fluid. To verify which microcooler design is the least sensitive to clogging, the operating times of various microcoolers with a cold-end temperature of 120 K are compared. In these experiments,...
Dr
Akiko Saito
(Toshiba corporation)
08/07/2014, 12:30
C-02: Cryocoolers- Pulse tube, Stirling, Magnetic and other coolers
Oral presentation (15min)
Active magnetic regenerative (AMR) refrigeration is well established concept of magnetic refrigeration which can generate a large temperature difference between both ends of a regenerator (AMR bed) by accumulating a lot of small temperature changes on every piece of magnetocaloric materials. In the AMR cycle, the magnetocaloric material and heat transfer fluid work collaboratively to...
Sergey Riabzev
(Ricor)
08/07/2014, 12:45
C-02: Cryocoolers- Pulse tube, Stirling, Magnetic and other coolers
Oral presentation (15min)
Joule-Thomson (JT) cryocoolers operate with a continuous flow of the working fluid that enters the cooler at a high pressure and leaves it at a lower pressure. Ideally, the temperature of the outgoing fluid equals the temperature of the entering fluid. JT cryocoolers that operate with pure refrigerants require high pressure of a few tens of MPa where the low pressure is usually around 0.1 MPa....
