Abstract
A new compact, low-cost, economically competitive and environmentally friendly cryogenic system for cooling a continuous gas flow down to about 30 K is under developing at the ILK Dresden, reported in this paper. The paper shows thermodynamic calculations of cycles on neon and neon-helium mixtures. The assessment of the degree of thermodynamic perfection of the neon cycles in comparison of neon-helium cycles is provided. The use of neon and neon-helium mixture in cryogenic cycles for cryostatting at a temperature level of 27…63 K will increase the thermodynamic efficiency of the cryogenic system and reduce the energy costs of obtaining cold at this temperature level. A technological chain/process, as well as the main economic indicators of the system under development are presented. The availability of such an innovative refrigeration system can be used in a wide range of cryogenic and cooling applications.
Highlights
The appearance of high-temperature superconductors (HTSC) has intensified interest in using neon as a cryogenic refrigerant
The main factor limiting the widespread use of neon in cryogenic technology is its high cost in comparison with helium
In connection with the growth in the consumption of neon in industries that are not related to cryogenics, the cost of production decreases, since the high cost of neon is associated with small volumes of its production
Summary
The appearance of high-temperature superconductors (HTSC) has intensified interest in using neon as a cryogenic refrigerant. For continuous cryostatting (either using a refrigerating cycle or a liquid coolant), helium, neon, and hydrogen can be used at T < 50 K. By using a neon as a refrigerant in the Claude cycle with vapor-liquid expander, the pre-cooling nitrogen unit can be omitted. In some research a neon-helium mixture was used for cryostatting at a temperature level of about 20 K [2,3,4,5] In these papers, the work of cryogenic systems on a mixture of neon with helium and hydrogen based on balance equations was investigated. By adding and using helium as a refrigerant the additional pre-cooling unit should be used In this case, the degree of thermodynamic perfection of the cycle slowly decreases with increasing of the helium content. It should be noted that in the absence of gas loss the value of operating costs with neon would be less since the energy for cooling with neon is less than for helium or mixture neon with helium
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