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Hydrogen Refueling in Aviation: The ALRIGH2T Approach

Hydrogen Refueling in Aviation: The ALRIGH2T Approach
Hydrogen is increasingly recognized as a vital component in the pursuit of climate-neutral aviation. However, its widespread adoption faces considerable challenges. Transitioning to hydrogen-powered flight requires not only the development of new refueling infrastructure and stringent safety protocols but also significant investment tailored to the specific operational demands of airports. The high costs associated with hydrogen production and distribution, coupled with the technical complexities of integrating hydrogen propulsion into existing aircraft designs, have resulted in a cautious response from the aviation industry. While some airlines and manufacturers are actively investing in hydrogen technologies, others remain hesitant due to economic uncertainties, regulatory hurdles, and the limited availability of hydrogen fuel. Concurrently, the sector is divided between advancing hydrogen solutions and exploring battery-electric alternatives.
The ALRIGH2T Initiative: Advancing Hydrogen Refueling Technology
In this context, the ALRIGH2T project (Airport-Level DemonstRatIon of Ground Refuelling of Liquid Hydrogen for AviaTion), supported by the European Union’s Horizon Europe programme, represents a significant effort to decarbonize air transport. The project aims to develop and demonstrate the first integrated liquid hydrogen (LH₂) refueling system designed specifically for aviation. Its goal is to establish a safe, efficient, and scalable hydrogen refueling process within operational airport environments. By achieving Technology Readiness Level 6 (TRL6), ALRIGH2T intends to validate the handling of liquid hydrogen at volumes relevant to commercial aviation, thereby laying the foundation for Europe’s transition toward hydrogen-ready airports.
Demonstrations are scheduled at Milan Malpensa and Paris-Orly airports, where the system will be tested under authentic operational conditions. Beyond liquid hydrogen, the project also explores the integration of gaseous hydrogen (GH₂) into ground operations, aiming to create a comprehensive hydrogen ecosystem across airport activities.
Technical Pillars and Innovations
ALRIGH2T’s approach is structured around three core technical pillars. The first involves the development of liquid hydrogen supply and transfer systems, including a high flow rate centrifugal liquid hydrogen pump capable of delivering 2,000 kilograms per hour. This innovation sets a new standard for aviation-scale refueling and targets a reduction in liquid hydrogen losses by at least six percent during loading operations. The second pillar focuses on direct refueling and control systems, featuring an instrumented 40-kilogram liquid hydrogen tank equipped with cryogenic sensors, integrated data acquisition, and a predictive digital twin for process simulation and real-time monitoring. The third pillar addresses the integration of gaseous hydrogen for ground operations, introducing hydrogen fuel cell-powered ground vehicles for towing and maintenance tasks, complementing the liquid hydrogen aircraft demonstrations.
Engineering, digitalization, and safety analysis are central to the project’s methodology. Detailed simulation studies have informed the safe configuration of the liquid hydrogen pump, while advanced thermo-fluid dynamic and structural models are being developed to support future scaling of these systems.
Despite the promise hydrogen holds for sustainable aviation, the path forward remains fraught with regulatory, economic, and technological uncertainties. ALRIGH2T’s real-world demonstrations aim to confront these challenges directly, providing essential data and operational insights that could accelerate the adoption of hydrogen in aviation and help shape the future of sustainable air transport across Europe.

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