1. Overview of Wave Energy Conversion Technologies
Alex Ruane
10/27/05

2. Tech Overview Wave Energy Basics Tapered Channel (TAPCHAN) Devices
Floats or Pitching Devices
Oscillating Water Column (OWC) Devices
AP Photo, NYC, 10/26/05

3. Wave Energy Basics
Wave energy is derived from surface winds across entire ocean
Mostly potential energy
Waves lose energy as they are refracted by shallow ground and break
Best sites for wave energy extraction need consistent waves
often near cliffs with deep bottom

4. Tapered Channel (TAPCHAN) Devices
Waves are focused through an opening into elevated reservoir
Potential energy gathered using proven hydro-electric technology
Requires huge (8500 m2) collecting pool and wide entrance
from “Feasibility of Developing Wave Power as a Renewable Energy Resource for Hawaii”, Hawaii Department of Business, Economic Development, and Tourism

5. Floating or Pitching Devices
Normally anchored to shoreline or seafloor
Wave motion drives fluid through a pump or propels a turbine
Energy may be extracted from both pitch and heave motions
Normally Offshore Devices
sit in higher energy environment
requires connecting cables
Source: “Feasibility of Developing Wave Power as a Renewable Energy Resource for Hawaii”, Hawaii Department of Business, Economic Development, and Tourism

6. Oscillating Water Column (OWC) Devices
Source: Falcao, 2004
Blow Hole as inspiration?
Trapped air is expanded and compressed by changing wave level
Propelled through air turbine
both directions of airflow generate energy
Release valve helps prevent stalling
maximum efficiency
Source: Clement et al., 2002