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Liquid Hydrogen

Liquid Hydrogen

Liquid hydrogen is a form of compressed hydrogen gas that has been cooled to minus 253°C, turning it into a liquid. Liquid hydrogen offers higher spatial efficiency for transportation and storage compared to gaseous hydrogen, as its volume is reduced by 1/800. This makes it a more useful and efficient energy solution than gaseous hydrogen.

  • POINT 1

    It is a clean energy source
    that does not emit pollutants.

  • POINT 2

    Easily accessible
    anywhere on Earth.

  • POINT 3

    다Demonstrates excellent stability compared to other fuels.

  • POINT 4

    Can be recycled, enabling energy independence without depletion.

Comparison between Liquid Hydrogen
and Gaseous Hydrogen

Liquefied hydrogen Gaseous hydrogen
3,300kg Transport volume per time 300kg
Large-scale transportation allows for long-distance and cyclic supply. Transportation Suitable for small-scale transportation in nearby areas.
Requires 1/3 to 1/10 of the area of a gas charging station Charges over 200 passenger vehicles or 40 buses per day hydrogen charging station Minimum of 200 square meters required Charging 50 cars or 10 buses per day
per unit 1 minute and 30 seconds Charging speed Per unit 10 minutes
1kWh/kg Power consumption of the charging station 2kWh/kg

Using only one power pack system, it is possible to adjust the flight and
operation time through the cross-use of batteries, gaseous hydrogen,
and liquid hydrogen. Cross-use is unique to Hogreen Air.

Liquefied hydrogen Gaseous hydrogen Battery
Operating Modes Drone + Fuel Cell + Liquid Hydrogen Drone + Fuel Cell + Gaseous Hydrogen Drone + Battery
Flight Time (excluding payload)
14 hours
2 hours
20 minutes
Durability Guaranteed lifespan of over 1,000 hours for both hydrogen systems Guaranteed lifespan of over 1,000 hours for both hydrogen systems Performance rapidly decreases after 100 charge/discharge cycles for the battery system
Convenience Easy hydrogen tank replacement within 5 minutes for both hydrogen systems Easy hydrogen tank replacement within 5 minutes for both hydrogen systems 3-hour charging time for the battery system