An integrated mixed refrigeration cycle for pre-cooling of refrigeration below 25 K. (April 2019)

• Record Type: Journal Article
• Authors: Kloeppel, S; Quack, H; Haberstroh, C
• Is Part Of: IOP conference series. Volume 502(2019)
• Publication Date: 2019-04
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/502/1/012149
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: Two trends can be found in current large-scale cryogenic projects. The first is the ever-increasing capacity requirements, while also a shift towards cooling demands at higher temperatures is observed. Conventional helium cycles require the use of oil flooded screw compressors, which are limited in efficiency, capacity, and reliability. Reverse-Brayton cycles with neon-helium mixtures deliver efficient refrigeration at a temperature above the dew point of neon, but cannot be applied to the cooling of conventional superconductors. This paper describes an approach where oxygen as a heavier gas allows the use of turbo-compressors viable. The oxygen is separated and used for providing refrigeration at higher temperature levels.