Japanese marine contractor Modec has unveiled a hybrid offshore energy concept that marries a three-bladed vertical axis wind turbine (VAWT) with a Savonius ocean-current turbine.
The Tokyo-based company’s
slimline Skwid design, forseen for powering islands in remote locations, is
calculated to have an output capacity of 500kW in winds of 13 metres per second
(m/s) rising toward 1MW in velocities of 16m/s.
“By harvesting renewable
energy from never-ending currents and strong and continuous ocean winds, the
technology of the Skwid [will] provide cost-effective power generation with
minimal environmental impact,” says Modec.
24-metre-diameter Darrieus VAWT has been modelled to capture twice the energy
from its rectangular swept area as a similarly dimensioned conventional onshore
split-cylinder, bucket-shaped current turbine does double duty, serving both to
jump-start the wind turbine as well as acting as a self-righting ballast to
keep the machine erect at sea.
The floating foundation,
moored via a four-line spread at a draft of 18 metres, houses the power
generation assembly on a set of rubber mounts at deck-level to buffer it
against wave motion.
“The Skwid is ideally suited
for ‘stranded’ islands and isolated locations as a power source,” says Modec.
The Skwid is Modec’s first renewable energy