Fizika Nizkikh Temperatur: Volume 46, Number 9 (September 2020), p. 1039-1053 ( to contents , go back )
Thermodynamic aspects of creating effective cryogenic helium units of the high performance with dynamic action machines (Review Article)
G. K. Lavrenchenko
Institute of Low Temperature Energy Technologies, Odessa, 65026, Ukraine
M. B. Kravchenko
Odessa National Academy of Food Technologies, V.S. Martynovsky Educational-Scientific Institute of Refrigeration, Cryotechnologies and Ecoenergy, 1/3 Dvoryanskaya Str., Odessa, 65082, Ukraine
Received February 24, 2020, published online July 22, 2020
Various types of effective cryogenic helium units with dynamic action machines have been proposed. The creation of a helium refrigerator with an energy-cryogenic stage (ECS), in which helium is compressed at the temperature of 85.8 K in a cold centrifugal compressor, is also considered. Optimization of the refrigerator along with the ECS was performed at the same cooling capacity of 576 W at a temperature level of about 4.5 K. The use of liquid nitrogen in the refrigerator was not provided. It is shown that it is possible to develop an effective helium refrigerator based on only dynamic-action machines — centrifugal compressors and centripetal turbo-expanders.
Key words: helium, refrigerant, cryogenic helium unit, Hе-refrigerant mixtures, centrifugal compressor, energy cryogenic stage, dynamic action machines.