The hydrogen superyacht project, bearing the designation 821, was implemented by the Feadship company, which is a joint venture of two shipyards : Royal Van Lent Shipyard and Koninklijke De Vries Scheepsbouw. Feadship designs and manufactures high-end yachts and builds custom ultra-luxury superyachts.
Project 821 is the largest yacht built by the company in the Netherlands. Its length is almost 119 meters. The capacity of the ship is up to 30 people. Passengers will be able to spend their time in chic suites with two bedrooms, bathrooms and everything else necessary for a luxurious experience. Also on board is a large living room, two offices with a fireplace, a hall, a closet, a pool, a jacuzzi and a steam room. On the main deck there is a spacious terrace and... a library!
Project 821 required the development of both completely new equipment and special security protocols. Because they just didn't exist before. Another problem is the hydrogen storage system. Engineers design a special "cryosarcophagus" with double walls.
Its area is 92 sq.m. The temperature inside is minus 253°C. 16 fuel cells are installed next to them, which can work with hydrogen, but also with ethanol. "Emissions" of the system (water vapour) is taken out through new ventilation shafts, resulting in the lengthening of the yacht by an additional 4 meters.
The ship can take on board almost four tons of liquid hydrogen. Total energy reserve - 543 kWh. This is enough to provide power for the internal systems and all other equipment for a week. However, diesel generators are also available as an alternative.
Furthermore, the vessel is equipped with a heat recovery system and “smart“ power consumption control system. Electronics automatically turn off electrical equipment when it is not needed. Project 821 is powered by ABB azipods with a system output of 4,351 hp. In the absence of hydrogen, they are powered by the aforementioned MTU generators, which run on biodiesel.