Europe’s ExFAN Develops Heat Propulsor

Graham Warwick March 04, 2025
exFAN

A hydrogen-electric geared fan has swept heat exchangers in the fan discharge flow to cool the fuel cells.

Credit: Vienna University of Technology
One of the biggest challenges with hydrogen-electric propulsion is cooling the fuel cells. While fuel cells are more efficient than turbine engines, 50-60% versus 30-40%, at the multi-megawatt scale required to power a large regional jet or single-aisle airliner with megawatts of waste, heat must be...
Graham Warwick

Graham leads Aviation Week's coverage of technology, focusing on engineering and technology across the aerospace industry, with a special focus on identifying technologies of strategic importance to aviation, aerospace and defense.

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