Liquid hydrogen systems require pressure control methods when flowing through complicated plumbing networks. Methods vary from autogenous pressurization, introducing a secondary fluid, buffer volumes, or utilization of transfer pumps. To address this need, a jet pump was designed, built, and tested with liquid hydrogen to assess variable primary nozzle position in relation to secondary fluid...
As the hydrogen market expands, the need for the efficient distribution of liquid hydrogen (LH2) becomes increasingly important. Reducing flash gas losses during LH2 transfer and ensuring adequate pressurization of downstream applications, such as fuel cells and combustion engines, are challenges. It is therefore essential to develop pumps for liquid hydrogen. To overcome transfer losses a...
Recent development of hydrogen-powered aircraft and cryogenic-propellant-powered rockets has created demand for smaller, lighter, and lower-power solutions to classic fluid handling problems. Valves, seals, and couplings rated for use with liquid hydrogen and liquid oxygen are critical to enable advanced aerospace system architectures. Creare is helping meet this need through development of...
Linde replaces an oil-bearing turboexpander, prone to oil contamination and component damage, with a maintenance-free dynamic gas-bearing turboexpander while adding a new cooling power control system to an existing cold box in a hydrogen process within a cryogenic tritium removal facility.
The dynamic gas-bearing turboexpander with proven technology, successfully used for years,...
Oil-Injected twin screw compressors are widely used in cryogenic helium refrigeration systems as the prime mover. They provide all the thermodynamic availability for the cryogenic refrigeration system and account for more than one-half of the input power losses and two-thirds of total system availability losses. These machines are generally designed for freon or other common refrigerants and...
This paper presents a modeling approach for graded heat exchangers designed to support cryogenic power systems of hydrogen-fueled electric aircraft implemented within our comprehensive MATLAB/Simulink-based tool, AeroCryoX. The graded heat exchanger concept employs graded and partitioned to accomplish distinct temperature grades to provide multiple secondary cryogen flows to efficiently cool...
Cryogenic applications require high complexity air and gas handling. Hydrogen is liquefied for ease of storage and transportation. Once liquefied, boil-off is avoided by cooling the hydrogen (zero-boil off). For both liquification and zero-boil off the reverse Brayton cycle is the most efficient and therefore preferred technology. Driven by a turbo compressor and a turbo expander, it is...
