Thermodynamic design of hydrogen liquefaction systems with helium or neon Brayton refrigerator
| Autor: | Ho-Myung Chang, Ki Nam Ryu, J. H. Baik |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Hydrogen 020209 energy Nuclear engineering Refrigerator car General Physics and Astronomy chemistry.chemical_element Liquefaction Thermal contact 02 engineering and technology 01 natural sciences Brayton cycle Neon chemistry 0103 physical sciences 0202 electrical engineering electronic engineering information engineering General Materials Science 010306 general physics Helium Liquefied natural gas |
| Zdroj: | Cryogenics. 91:68-76 |
| ISSN: | 0011-2275 |
| DOI: | 10.1016/j.cryogenics.2018.02.007 |
| Popis: | A thermodynamic study is carried out for the design of hydrogen liquefaction systems with helium (He) or neon (Ne) Brayton refrigerator. This effort is motivated by our immediate goal to develop a small-capacity (100 L/h) liquefier for domestic use in Korea. Eight different cycles are proposed and their thermodynamic performance is investigated in comparison with the existing liquefaction systems. The proposed cycles include the standard and modified versions of He Brayton refrigerators whose lowest temperature is below 20 K. The Brayton refrigerator is in direct thermal contact with the hydrogen flow at atmospheric pressure from ambient-temperature gas to cryogenic liquid. The Linde-Hampson system pre-cooled by a Ne Brayton refrigerator is also considered. Full cycle analysis is performed with the real properties of fluids to estimate the figure of merit (FOM) under an optimized operation condition. It is concluded that He Brayton refrigerators are feasible for this small-scale liquefaction, because a reasonably high efficiency can be achieved with simple and safe (low-pressure) operation. The complete cycles with He Brayton refrigerator are presented for the development of a prototype, including the ortho-to-para conversion. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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