Oscillating Water Column Devices (OWC)
An oscillating water column (OWC) device is a type of wave energy converter that harnesses the power of ocean waves to generate electricity.
Structure and Operation
- Design: An OWC device consists of a partially submerged concrete structure that encloses a column of air above a column of water. The water enters the device through a subsurface opening into a chamber.
- Wave Action: As sea waves hit the device, they cause the water level in the chamber to rise and fall, creating a piston-like movement. This movement compresses and decompresses the air trapped above the water column.
- Air Flow: The alternating rise and fall of the water column force the air to flow through an opening connected to a turbine. The compressed air is pushed out through the turbine, while the falling water column creates a vacuum that draws air back in.
- Energy Generation: This process of compressing and depressurizing air drives the turbine, which converts the mechanical energy into electrical energy.
Example Installation
One notable installation of an OWC device is located at Islay, UK. This shoreline-based device effectively captures wave energy and converts it into electricity, contributing to renewable energy generation.
Wells’ Turbine
OWC devices typically use Wells’ turbines to extract energy from the reversing air flow.
