Hydrogen fuel cells and the economics of unmanned aerial vehicles (UAVs) are gaining global attention. With higher energy densities, fuel cells can overcome the range limitations of lithium battery-powered aircraft. This paper is to address two important issues often overlooked in research on fuel cell UAVs.
Hence, for low-power fuel cell UAVs, using air-cooled fuel cells mixed with lithium batteries is a viable solution that balances maximum range and response time. From the above, it is clear that hydrogen fuel cells and low-altitude economics are increasingly becoming focal points of global attention.
The study shows that using air-cooled fuel cells in a 3.5 kW UAV is a superior solution compared to lithium batteries when the energy demand exceeds 2.8 kWh. Furthermore, the power demand increases by 3.5 % per kilometre in altitude, and the maximum flight altitude is reduced by approximately 266 m per kilogram of take-off mass.
Considering only carrying a 9 L hydrogen tank, the maximum range of fuel cells is approximately 1.5 times that of lithium batteries. Additionally, as the flight altitude increases, the power demands of fuel cell-powered UAVs also increase, indicating that the flying time will be shortened.
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