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Ocean Thermal Energy Conversion

Land Based vs. Floating OTEC

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So, How Does it Work?
Land Based vs. Floating OTEC
Environmental Impact, Pros & Cons Overall
Links
OTEC DEVELOPMENTS and FUTURE of OTEC
The Processes, Pros, & Cons

landbasedotec.jpg

See Above

        Off-white - Turbine and generator building

  • Pink - Warm water pumps
  • Red - Warm water tank
  • Pale Blue - Cold water pumps
  • Blue - Cold water tank
  • Yellow - Condenser/ desalination plant
  • Pale Green - Fresh water tanks
  • Light Brown - Services, including control centre and maintenance
  • Dark Brown - Power sub-station
  • Purple - Sundry support facilities

PLANTSHIP

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Land-Based nd near-shore facilities: Three Main Advantages 

1 Do not require complex mooring, lengthy power cables, or the expensive maintenance needed for open-ocean environments.

2 Located in sheltered areas, they are relatively safe from storms and heavy seas. Electricity, desalinated water, and cold, nutrient-rich seawater could be transmitted more easily via trestle bridges or causeways.

3 Operations with mariculture are possible. Ones that require desalinated water can be greatly helped.

Favored locations include those with narrow shelves (volcanic islands), steep (15-20 deg) offshore slopes, and relatively smooth sea floors. These sites minimize the length of the cold-water intake pipe.

A disadvantage of land-based facilities comes from turbulent wave action in the surf zone. The plant's discharge pipes as well as its water supply should be buried in protective trenches, to shield them from storms and  heavy seas. The mixed discharge (of cold and warm seawater) must be taken hundreds of meters offshore to reach the appropriate depth before release. This can require greater expenses and more construction.

FLOATING OTEC

 

Sea based OTEC works in much the same way. Its positive qualities include the greater amount of electricity it is capable of producing, and its proximity to the energy source (the ocean). As mentioned above, the amount of effort and expenses needed to allow it to function and stablize can be a significantly negative quality.

OTEC -- A NEW APPROACH to YOUR WORLD