100-Megawatt Power Plant Via Variations In Ocean Temperature

Note* - All images used are for editorial and illustrative purposes only and may not originate from the original news provider or associated company.

Subscribe

- Never miss a story with notifications

- Gain full access to our premium content

- Browse free from any location or device.

Media Packs

Expand Your Reach With Our Customized Solutions Empowering Your Campaigns To Maximize Your Reach & Drive Real Results!

– Access the Media Pack Now

– Book a Conference Call

– Leave Message for Us to Get Back

Related stories

Eight Energy Trends 2025: Redefining Global Energy Landscape

The Eight Energy Trends Defining 2025 The year 2025 is...

Ocean engineering firm Tadek delivers floating wind study for Marine Power Systems

The report assesses through-life performance of Tension Leg Platforms (TLP) compared...

Ensuring the integrity of underwater energy production equipment and related facilities

EEMUA has substantially upgraded its subsea engineering materials selection...

 

A barrier to advancing the development of the massive ocean thermal energy conversion (OTEC) resource is its potentially adverse biological impact, but a new DOE-funded study carried out by Makai Ocean Engineering found the biological impact can be minimized.

 

This is expected to remove a significant regulatory obstacle to permitting pilot projects and clear the way for OTEC developers to move toward building 100-megawatt deep ocean power plants.

OTEC uses the higher temperature of the ocean’s surface water to turn liquefied ammonia, which has a very low boiling point, into a vapor that drives a turbine in the same way steam from water boiled by nuclear energy, fossil fuels or concentrated solar energy drives a turbine to generate electricity.

For a 100-megawatt plant on a floating platform much like a deep water drilling rig, tugboat-sized engines would pump the 25-degree-Celsius surface ocean water into an evaporator that vaporizes the ammonia. The vaporized ammonia then passes through the turbine, thereby compelling it to move, and is recaptured.

Engines then pump cold ocean water of approximately 5 degrees Celsius into a condenser that cools the recaptured ammonia back into a liquid so it can be cycled back to the vaporizer in a closed-loop system.

The potential biological impacts would come from the water discharged into the ocean. It cannot be discharged at the 20-meter-to-40-meter, near- surface, light-permeated depths of the evaporator and condenser where ecosystem-sustaining phytoplankton populations thrive.

The cold water brought up to the condenser from a kilometer below the surface has sources of nutrients in it that could cause a phytoplankton proliferation or an unwanted algal bloom.

The published report on Makai Ocean Engineering’s research, entitled “Modeling the Physical and Biochemical Influence of Ocean Thermal Energy Conversion Plant Discharges” indicates that if the water is returned to a depth of approximately 70 meters, it would not cause an ocean environment perturbation of biological significance.

“This is a significant advance,” explained Makai Senior Ocean Engineer Pat Grandelli. “The first unknown that affects OTEC’s economic feasibility is the ability to get a permit. The National Oceanic and Atmospheric Administration [NOAA] is the licensor of OTEC plants, but has no regulations in place right now. The [agency doesn’t] even have an application form.”

Permitting is “a key hurdle for OTEC,” Grandelli said, because small startup companies don’t have “the deep pockets” to get through a long and rigorous application process.

 

Latest stories

Related stories

Eight Energy Trends 2025: Redefining Global Energy Landscape

The Eight Energy Trends Defining 2025 The year 2025 is...

Ocean engineering firm Tadek delivers floating wind study for Marine Power Systems

The report assesses through-life performance of Tension Leg Platforms (TLP) compared...

Ensuring the integrity of underwater energy production equipment and related facilities

EEMUA has substantially upgraded its subsea engineering materials selection...

Subscribe

- Never miss a story with notifications

- Gain full access to our premium content

- Browse free from any location or device.

Media Packs

Expand Your Reach With Our Customized Solutions Empowering Your Campaigns To Maximize Your Reach & Drive Real Results!

– Access the Media Pack Now

– Book a Conference Call

– Leave Message for Us to Get Back