Conventional and enhanced exergy analysis of a hydrogen liquefaction system

Utlu, Zafer; Karabuga, Arif

doi:10.1016/j.ijhydene.2020.10.104

Cited by 18 publications

(1 citation statement)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hydrogen turbo-expander is the main piece of refrigeration equipment employed in the process of hydrogen liquefaction. The cycle efficiency and yield of the hydrogen liquefaction process are greatly affected by the performance of the hydrogen turbo-expander [10].…”

Section: Introductionmentioning

confidence: 99%

Performance Prediction of High-Speed Hydrogen Gas-Lubricated Herringbone Grooved Journal Bearing

Qiang¹,

Zhao²,

Yan³

et al. 2022

Applied Sciences

View full text Add to dashboard Cite

The liquefaction of hydrogen is considered to be a crucial process in the large-scale utilization of hydrogen energy. In hydrogen liquefaction, hydrogen turbo-expander is a key refrigerating machine for high liquefaction efficiency. Performance of the turbo-expander is directly affected by the hydrogen gas bearings. To obtain a deep understanding of the performance characteristics of hydrogen gas bearings, the static and dynamic characteristics of herringbone grooved journal bearings under hydrogen and other lubricating gases were numerically calculated and compared. The bearing load capacity and critical mass of hydrogen gas bearings were slightly lower than those of helium-, air- and nitrogen-lubricated bearings. To improve the performance of the hydrogen gas bearings used in high-speed turbo-machinery, the influence of working conditions was analyzed. It is found that the load capacity of hydrogen gas bearings can be improved by increasing the ambient pressure, reducing the gas film clearance, and raising the bearing eccentricity ratio. Meanwhile, the critical mass increases, and the bearing dynamic stability is enhanced.

show abstract

Section: Introductionmentioning

confidence: 99%