Abstract Small-scale Cryotiger coolers are based on commercially available hermetic oil-lubricated compressors and operate in a range of 70 to 200 K with different mixed refrigerants. Modern coolers efficiently operate with both flammable HC-based and nonflammable HFC-based refrigerants. This allows compliance with the requirements of many customers involved in the design of integrated systems. New HFC mixed refrigerants are compatible with the selected oils, and a family of refrigerant candidates allows retrofitting of the coolers with an optimal composition for a given temperature range. However, the configuration of the counter flow heat exchanger significantly influences refrigeration performance. Test data obtained for tube-in-tube heat exchangers are in a good agreement with computer modeling. This allows optimization of the performance and dimensions of the heat exchanger for a particular cooler. This paper compares the performance of the new nonflammable refrigerant mixtures with prior flammable refrigerant mixtures. Test data on the performance and operating parameters are presented for both steady state and cool down regimes.
Comparative Performance of Throttle Cycle Cryotiger Coolers Operating with Different Mixed Refrigerants
Cryocoolers 13 ; 481-488
01.01.2005
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Heat Exchanger , Adiabatic Compressor , Refrigerant Mixture , Piston Compressor , Refrigeration Capacity Physics , Extraterrestrial Physics, Space Sciences , Strongly Correlated Systems, Superconductivity , Optics, Optoelectronics, Plasmonics and Optical Devices , Imaging / Radiology , Automotive Engineering
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