Autoren

Eduardo BRIALES, Aritz ARRIZABALAGA, Guillermo GARCÍA-MIGUEL, Tomás CRESPO, José MEDRANO 
H2SITE, Bizkaia, ES

Zusammenfassung

This study explores ammonia-to-power systems for onboard applications, assessing configurations that enable hydrogen use from ammonia cracking. The goal is to evaluate their technical and economic feasibility for propulsion and auxiliary systems. A techno-economic analysis was carried out using literature data and internal models based on operational profiles of a Platform Supply Vessel (PSV) and a Chemical Tanker. 

The analysis includes system efficiency, emissions, and total cost of ownership (TCO) over the vessel’s lifetime in retrofit and newbuild cases. Results show that onboard ammonia cracking enables continuous high-purity hydrogen production, allowing zero-emission operation and improved performance. Although peak efficiencies of internal combustion engines (ICE) and cracker–fuel cell systems are comparable (~45%), real-world ICE efficiency averages closer to 35%, while fuel cells consistently deliver around 45%. This efficiency gap is key for transitioning to low-carbon maritime power. The hydrogen can be used in fuel cells, ICEs, or hybrid systems, depending on operational needs.
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