The ocean harbors abundant energy in the form of wind, waves and sun. All of these could be sampled on something called an Energy Island: a floating rig that drills for renewables instead of petroleum.

The concept is the brainchild of inventor Dominic Michaelis. He was originally unsatisfied with the slow progress in developing ocean thermal energy conversion, a process in which cold water is pumped up from the deep ocean to generate electricity.

“Nothing new was happening with OTEC, so I thought why not bring other marine energy technologies on board?” Michaelis said.

he Energy Island that he and his son have designed would have an OTEC plant at its center, but spread across the 2,000-foot-wide (600-meter-wide) platform would also be wind turbines and solar collectors. Additionally, wave energy converters and sea current turbines would capture energy from water moving around the structure.

One of these hexagonally-shaped islands could generate 250 megawatts (enough power for a small city), Michaelis said. Even more power is possible by mooring together several Energy Islands into a small archipelago that could include greenhouses for food, a small harbor for ships and a hotel for tourists.

To attract possible investors, the Energy Island team will present their concept this week at the U.S. China GreenTech Summit in Shanghai.

Running hot and cold
The principle reason to build an Energy Island is to harvest OTEC.

“The advantage of OTEC over other marine energy technologies is that it’s constant, 24 hours a day and all year round,” Michaelis told LiveScience.

This is because it is based not on the sun or the wind or the waves, but on the temperature difference between warm water at the sun-heated surface and cold water in the deep, dark ocean.

The biggest temperature differences can be found in tropical seas, where the surface water is around 80 degrees Fahrenheit (25 degrees Celsius).

This warm water is drawn in from around the Energy Island and used to evaporate a working fluid, which might be seawater or ammonia. The resulting vapor pushes a turbine that produces electricity.

To condense the vapor back to fluid, cold water at about 40 degrees Fahrenheit (5 degrees Celsius) is pumped up from a half mile below the surface. This condensation creates a pressure drop that helps suck more vapor through the turbine blades.

The same basic process occurs in a coal-fired or nuclear power plant, but the temperature difference between water boilers and cooling towers is much greater than in an OTEC system.

Large overhead
The first OTEC plant was built in 1930 on a Cuban shoreline and produced 22 kilowatts of power. Only a handful of other facilities (both floating and land-based) have been constructed since, with the largest being a 250-kilowatt pilot plant in Hawaii. None are currently operating.

The main drawback has been the inherent inefficiency of converting a relatively small temperature difference into electricity. In fact, some of the early OTEC designs used more energy than they were able to produce.

An OTEC plant requires a lot of energy to circulate massive amounts of water. The Energy Island, for example, will need more than 100,000 gallons (400 cubic meters) of cold water pumped up per second.

This is why Michaelis incorporates other marine energy technologies to help “prime” the OTEC system.

Fringe benefits
The clean power generated by an Energy Island could be transmitted to shore by underwater cables. Or it could be used to make hydrogen from water, and this hydrogen fuel could be shipped to the mainland in order to produce electricity in fuel cells.

The exported electricity might run 9 to 13 cents per kilowatt-hour, depending on how the project is financed, Michaelis said. A single Energy Island has an estimated price tag of $600 million.

However, electricity is not the only thing these man-made isles can offer.

If seawater is used as the OTEC working fluid, it will be desalinated through the cycle of evaporation and condensation. For each megawatt of electricity produced, an OTEC plant can supply 300,000 gallons of fresh water per day, Michaelis said.

Moreover, the cold water pumped up from the ocean depths is full of nutrients that could support fish farms or some other form of aquaculture.

When we look closely at human history we can easily conclude that locomotion is one of the most primordial needs. But our current lifestyle does not allow us with much of the movements. We need to move more often. But it is also true that we live in fitness conscious times. Going to a gymnasium and working out has become a health statement. But till now many of us have not delved deep into what happens in a gymnasium and how can we utilize events happening in gym for better purposes. If we look carefully every member of a gym in a particular time slot is performing some controlled and repetitive motion be it lifting weight or running on a treadmill or doing crunches. What can we do with all these motions?

Architect Mitchell Joachim, along with Douglas Joachim, a personal trainer, envisioned an idea that might redefine the perception of a gymnasium. When people exercise all the energy created by motion is wasted and it disappears into nothingness. If we can channelize all this kinetic energy into something meaningful we can have a floating River Gym, a kind of soft floating micro-island. It will utilize all the energy made by gym goers and convert it into usable electric energy stored in on-board batteries. This ground-breaking gym will not only endow us with a stimulating view to look upon, but will also provide increased transportation as well as a unique way to purify water while working out.

“Our concept encapsulates a new typology for the contemporary urban gym. It is intended to challenge our innate proprioceptive and multi-planer locomotive abilities while synchronously altering the surroundings. The River Gym will fulfill one of the major contemporary fitness goals of ‘functional training’,” Mitchell and Douglas Joachim elaborate.

When you go to a regular gym all you can enjoy is the sweaty images of you and fellow gym goers or a TV set or some music tracks going in loops. But here in River Gym you can observe the waves playing on the sea bed or some sea creatures taking into account what is happening in the river capsule. Why you have to subject yourself to same good old TV or music? While exercising, you can volunteer to transport some passengers to their destination too. That will combine exercising with some altruism.

This River Gym will offer all the facility a usual gym offers such as lockers, a reception desk and health food kiosks. All this would be housed in multiple points at the edges of each river body. Mitchell and Douglas put forth their views, “By continuing to provide vital health amenities, the River Gym can leave the realm of the glass box and become a useful multi-planar kinetic space.”

It is stated that they are dealing with concepts to harvest wasted human energy but utilizing a knee brace that captures energy from walking and uses it to produce electricity, or a system capable of channeling kinetic energy into electric power is awesome. These necessary devices are being developed by the Idaho based company Motion 2 Energy.