Mixed refrigerant cycle with neon, hydrogen, and helium for cooling sc power transmission lines

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Kloeppel, S.^1 ; Dittmar, N.^1 ; Haberstroh, Ch.^1 ; Quack, H.^1

TU Dresden, Bitzer-Professur fuer Kaelte-Kryo- und Kompressorentechnik, Germany^1

关键词: Cryogenic refrigeration;    Liquid hydrogens;    Low molecular weight;    Mixed refrigerant cycles;    Overall efficiency;    Refrigeration cycles;    Three-component mixtures;    Turbo compressors;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012019/pdf
DOI  :  10.1088/1757-899X/171/1/012019

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The use of superconductors in very long power transmission lines requires a reliable and effective cooling. Since the use of cryocoolers does not appear feasible for very long distances, a cryogenic refrigeration cycle needs to be developed. For cooling superconducting cables based on MgB2(Tc= 39 K), liquid hydrogen (LH2) is the obvious cooling agent. For recooling LH2, one would need a refrigeration cycle providing temperatures at around 20 K. For this purpose, one could propose the use of a helium refrigeration cycle. But the very low molecular weight of helium restricts the use of turbo compressors, which limits the overall efficiency. In order to increase the molecular weight of the refrigerant a mixture of cryogens could be used, allowing the use of a turbo compressor. Temperatures below the triple point of neon are achieved by phase separation. This paper presents a possible layout of a refrigeration cycle utilizing a three component mixture of neon, hydrogen, and helium.