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The Project 821 vessel is capable of carrying almost four tons of liquid hydrogen. It will be enough to generate energy for a week, with the bulk going to ensure the operation of internal systems. If there is no hydrogen or there is a long voyage ahead, diesel generators come into play. Project 821 also boasts an advanced excess heat recovery system and intelligent energy control, which, for example, automatically turns off air conditioning in non-residential cabins.

Feadship has launched the world’s first hydrogen-powered superyacht. It is called Project 821 and is almost 119 meters long – it is the largest yacht built in the Netherlands. According to the creators, the equipment, protocols and safety rules for it had to be developed from scratch, because they simply do not exist. And one of the most difficult issues was the issue of hydrogen storage.

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Hydrogen itself is very light: in its liquid state, one cubic meter weighs 70 kilograms versus 800 for biodiesel. However, due to its low density, hydrogen requires 8-10 times more space. At Project 821, it is stored in a “cryosarcophagus” (-253 °C) with double walls with an area of ​​92 square meters. There are also 16 fuel cells installed (they can also run on methanol), current converters and ventilation shafts to remove water vapor, because of which the length of the yacht had to be increased by four meters.

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The tank holds about four tons of hydrogen, but even that is not enough to, say, cross the Atlantic. Therefore, hydrogen is mainly used when leaving/entering the port and to supply electricity to the ship itself. The total energy reserve is 543 kilowatt-hours. This is enough to power the entire ship for a week without worrying about harmful emissions. The heat recovery system, which heats the pool, jacuzzi, steam room, heated towel rails and floors in guest bathrooms, helps further reduce the carbon footprint.

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Project 821 is powered by ABB azipods with a total capacity of 4,351 horsepower, which, in the absence of hydrogen, are powered by MTU biodiesel-powered generators. The vessel is positioned as a family vessel. The owner has a luxurious apartment with two bedrooms, bathrooms and dressing rooms, a gym, a storage room, two offices with a fireplace and a large living room. The promenade deck has shaded areas, and the main deck has a library and a spacious terrace. The ship can accommodate up to 30 people.

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