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PRIMRE/Databases/Projects Database/Devices/IHI Corporation Kairyu
From Open Energy Information
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IHI Corporation Kairyu
Kairyu comprises a combination of three cylindrical floats called pods, having a total length of approximately 20 m, a width of approximately 20 m, and a turbine rotor diameter of approximately 11 m. The two turbine rotors, left and right, are rotated in opposite directions to each other to cancel rotary torques associated with the rotation of the turbine rotors, thereby stably maintaining its position under water. The turbine system is moored from the anchor installed on the sea bottom and is suspended at underwater in operation. The depth of the sea is around 100 m, and the turbine system is installed at 30-50 m below sea surface. It can be floated up to the sea surface for maintenance. The rated flow speed is 1.5 m/s (approximately 3 knots) and the rated output, i.e., generating capacity is approximately 100 kW (50 kW × 2 units).
Additional Information
Device Status
Is the device actively being developed or is available for purchase (active)? Or has development or support ended (inactive)?
Active
Technology Type
Power Take-Off
Mechanism that converts the motion of the prime mover into a useful form of energy such as electricity, learn more
Direct Drive Generator
Max Rated Power Capacity
The maximum amount of electricity that can be produced by the device, as rated by the manufacturer.
100 KW
Surface ExpressionFalse
Estimated TRL
Estimated Technology Readiness Level scale from 1 to 9 with 9 being the most mature technology
TRL Last updated: 15 September 2023
6
Energy Resource
- Ocean Current
Water Column Position
Surface
--------------------------------------------
Submerged - Mid
Entire Water Column
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Submerged - Bottom
Last Modified
13 June 2025
Citation Formats
“IHI Corporation Kairyu.” Marine Energy Projects Database: Devices, PRIMRE, United States Department of Energy, https://openei.org/wiki/PRIMRE/Databases/Projects_Database/Devices/IHI_Corporation_Kairyu. Accessed <day> <monthRoman> <year>.
Marine Energy Projects Database: Devices. <year>. "IHI Corporation Kairyu." Accessed <monthRoman> <day>, <year>. https://openei.org/wiki/PRIMRE/Databases/Projects_Database/Devices/IHI_Corporation_Kairyu.
