Conveners
C3OrK - Special Session: JT Coolers
- Jacob Kephart (Navy Ships Systems Engineering Station)
- Than Yatming (BNL)
Mr
Xuan Tao
(Institute of Refrigeration and Cryogenics,Zhejiang University)
01/07/2015, 16:15
CEC-03 - Cryocoolers (Non-Aerospace)
Contributed Oral Presentation
Heat exchangers of high efficiency are critical components in cryocoolers, whose performance influences the overall performance of the cryocoolers to a large extent. The entropy generation in heat exchangers primarily is a result of heat transfer across finite temperature difference. The traditional approach is to increase the heat transfer area and heat transfer coefficient so as to reduce...
Milind Atrey
(Indian Institute of Technology Bombay), Dr
Rashmin Damle
(IIT Bombay)
01/07/2015, 16:30
CEC-03 - Cryocoolers (Non-Aerospace)
Contributed Oral Presentation
Cryogenic temperatures are required for proper functioning of infrared sensors and thermal cameras, space chamber simulations, preservation of biological samples, etc. Such temperatures can be produced by expanding a high pressure gas in a relatively easier way. This is popularly known as the Joule-Thomson (J-T) effect. A typical miniature J-T cryocooler consists of a storage...
Dr
Nir Tzabar
(University of Twente)
01/07/2015, 16:45
CEC-04 - Cryocoolers (Aerospace)
Contributed Oral Presentation
Sorption-based Joule-Thomson (JT) cryocoolers often operate with pure gases. A sorption-based compressor has many benefits; however, it is limited by the pressure ratios it can provide. Using a mixed-refrigerant (MR) instead of a pure refrigerant in JT cryocoolers allows working at much lower pressures. Therefore, it is desired to use MRs in sorption-based cryocoolers in order to reduce one...
Marcel ter Brake
(University of Twente, The Netherlands)
01/07/2015, 17:00
CEC-03 - Cryocoolers (Non-Aerospace)
Contributed Oral Presentation
METIS, the Mid-infrared E-ELT Imager and Spectrograph, is one of the proposed instruments for the European Extremely Large Telescope (E-ELT) that will cover the thermal/mid-infrared wavelength range from 3- 14 μm. Its detectors and optics require cryogenic cooling at four temperature levels, 8 K for the N-band detectors, 25 K for the N-band imager, 40 K for the L/M-band detectors and 70 K for...
Prof.
SHRIDHAR BAPAT
(Mechanical Engineering Department, Indian Institute of Technology Bombay, Mumbai 400076, India)
01/07/2015, 17:15
CEC-05 - Expanders, Pumps, Compressors, and Regenerators
Contributed Oral Presentation
The requirement of a cryocooler with practically zero vibration and no electromagnetic interference has led to development of sorption compressor based Joule-Thomson (J-T) coolers. The adsorption is carried out at near room temperature and desorption process at an elevated temperature. High pressure is generated due to accumulation of desorbed gases inside the adsorber cell on providing heat...
