Wave and Tide Energy Flashcards
What are examples of ocean energy technologies?
Wave, Tidal, ocean and salinity gradients.
What ocean RE have the most potential?
Tidal currents and ocean wave.
What are some general issues with ocean RE?
Reliability, robustness and ecosystem concerns.
What resources are considered with ocean RE?
High wave height, period and mean direction.
Oscilliating Water Colummns
A wave energy converter, harnessing seawater oscillating energy caused by wave action.
What is the mechanism of OWC?
A device semi-submerged with a hollow chamber open to the sea with trapped air pocket above water collum, wave forcing piston like movement.
What envrionmental effects does wave/tidal energy have?
Benthic organisms due to tidal/wave behaviour, and sediment dynamics, marine animal entanglement.
Life Cycle Assessments
These weigh effects a product has on the envrionment over its lifetime.
Pelamis Wave Power
An offshore scotland generation, generating 2.25 MW at peak output, generating 23g of CO2 per kWh comparted to coals 820g of coal
What are negative impacts tidal current energy can have?
Alter water flows, substrate composition and sediment dynamics.
Naturual Electromagnetic Fields
Provide ecologically important cues to marine animals for resource location, communication and mate location.
What are costs of tidal stream farms?
About $0.15 to 0.55% per kWh
What is the costs and energy production of South Koreas tidal power station?
254MW capacity, costing 298m to build, producing electricity at $0.02 per kWh
Why is ocean/tidal power hard to grid?
Subsea electrical systems and submarine cable required, whilst good energy resoruces far offshore.
Why is ocean energy reliable?
Tidal and wave processes are periodic stochastic processes
