Researchers enhance hydrogen absorption in metallic hydrides utilizing semi-cylindrical coil warmth exchanger


Researchers from the College of Expertise Sydney (UTS) and Queensland College of Expertise (QUT) have developed a brand new methodology to enhance hydrogen absorption in metallic hydrides. An open-access paper on their strategy is revealed in Scientific Experiences.

Steel hydrides (MH) are often called one of the crucial appropriate materials teams for hydrogen power storage due to their giant hydrogen storage capability, low working stress, and excessive security. Nonetheless, their sluggish hydrogen absorption kinetics considerably decreases storage efficiency. Sooner warmth elimination from MH storage can play a vital position to reinforce its hydrogen absorption charge, leading to higher storage efficiency.

On this regard, the current research goals to enhance warmth switch efficiency to positively affect the hydrogen absorption charge of MH storage techniques. A novel semi-cylindrical coil is first designed and optimized for hydrogen storage and embedded as an inside warmth exchanger with air as the warmth switch fluid (HTF).

… Outcomes from this research display that MH storage efficiency is considerably improved through the use of a semi-cylindrical coil warmth exchanger (SCHE). The hydrogen absorption period reduces by 59% in comparison with a traditional helical coil warmth exchanger. The bottom coil pitch from SCHE results in a 61% discount of the absorption time. When it comes to working parameters for the MH storage with SCHE, all chosen parameters present a serious enchancment within the hydrogen absorption course of, particularly the inlet temperature of the HTF.

—Larpruenrudee et al.

An issue with metallic hydride for hydrogen power storage has been its low thermal conductivity, which results in sluggish charging and discharging occasions. First writer Puchanee Larpruenrudee, a PhD candidate within the UTS College of Mechanical and Mechatronic Engineering, stated quicker warmth elimination leads to quicker charging occasions.

A number of inside warmth exchangers have been designed to be used with metallic hydride hydrogen storage. These embody straight tubes, helical coil or spiral tubes, U-shape tubes, and fins. Utilizing a helical coil considerably improves warmth and mass switch contained in the storage. That is as a result of secondary circulation and having extra floor space for warmth elimination from the metallic hydride powder to the cooling fluid. Our research additional developed a helical coil to extend warmth switch efficiency.

—Puchanee Larpruenrudee

The researchers developed a semi-cylindrical coil as an inside warmth exchanger, which considerably improved warmth switch efficiency. The hydrogen charging time was decreased by 59% when utilizing the brand new semi-cylindrical coil in comparison with a conventional helical coil warmth exchanger.


Traits of chosen geometries for metallic hydride reactors. (a) With helical tube warmth exchanger, and (b) with semi-cylindrical tube warmth exchanger. Larpruenrudee et al.

They’re now engaged on the numerical simulation of the hydrogen desorption course of, and persevering with to enhance absorption occasions. The semi-cylindrical coil warmth exchanger shall be additional developed for this function.

The researchers intention to develop a brand new design for hydrogen power storage, which can mix different kinds of warmth exchangers. They hope to additionally work with trade companions to analyze actual tank efficiency based mostly on the brand new warmth exchanger.


  • Larpruenrudee, P., Bennett, N.S., Gu, Y. et al. (2022) “Design optimization of a magnesium-based metallic hydride hydrogen power storage system.” Sci Rep 12, 13436 doi: 10.1038/s41598-022-17120-3


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