Laura what is 10% of 93,000 gallons of algae culture, per tank volume? and you don't get 3%. 50% of the mass of algae is oil. In my tanks system the algae is stirred on a continuous bases. and the tank is internally illuminated with LED lighting. With the small foot print of the tanks (400 square feet) I can put 96 on one acre of space.

Thanks Laura, the project is YOUR baby to carry full term. I only comment because I believe that is what this forum is intended. GE is judging us as we judge others and ourselves. If we refuse to learn and help each other then why would they help us.
For your privacy I posted a more technical analysis in my SPWT.
Feed your INVENTION and it will grow.

As a Engineer (Mech)that has built many wind turbines, roofs and installed cell phone transceivers in NY, NJ and PA (On the highest Urban roof or suburban tower), I calculate wind shear and gradients for a living. On many of the jobs that have been done the most knowledgeable consultants have been the GE Engineers (They provide a lot of power equipment). So to support or comment on this project carries a lot of responability because quite a few NONVOTING people read my comments.
The problem with the shroud is that it displaces the wind energy without you trying to recover it, the presure difference in the front and back of the turbine is potential energy PE when you multiply by the rotor speed. If you add spoilers (airfoils)at the ends this would convert the PE to KE at the rotor tips. As designed your turbine is torque sensitive, when you extract power the turbine will slow and the PE increase. The addition of spoilers will increase the torque at the tips and maintain rotor speed.
Your turbine does not use wind "lift" and so the rotor speed is limited to a fraction of the wind speed. The DRAG induced by the shroud is greater than "working drag" of the turbine blades, this high SOLIDITY is a design that avoided in modern design due to structral costs (Old windmills vs 3 blade rotors). If your run your design over a SOLIDWORKS analysis the support pole needs to be at least 3x that of the more efficeint 3 rotor HAWT. (for speeds 5 - 7 m/s, more if > 7 m/s)
When you choose to stack the turbines vertically the rotors should be decoupled or the lower ones will drag the higher ones. Wind gradient is nonlinear and GREATLY increases with hieght.
With some redesign and testing, simulation or prototype you should have a marketable product regardless of what happens in the GE Challenge (In my submissions I destroyed the idea of WIND ONLY turbines for powering the home).
Best of luck.

Laura - Thanks for your support for my submission. Also congratulations on your showing in Phase 1. I like the aspect of your design that maintains operation in very high wind. Most other turbines "feather" and lose potentially significant power production above a critical wind speed. This together with your proported high efficiency should reduce the cost per kwh. If the relative cost and efficiency benefits are maintained at small home installation units then there is the added benefit of displacing retail cost not wholesale cost as with big wind generators. Good Luck.

Very nice, very slick design.

Check our pictures of our home model @ http://royalwindturbines.com/index.php?p=1_9_Gallery

Hi Laura, sweet design!

Finally a real product which people would be willing to put on their backyards, balconies, roofs, etc.

1- How much area around it does it need in terms of wind turbulence? Or is it impervious to turbulence?
2- Do you have several sizes to meet different customer needs?
3- How much power in average are you getting off the one on the picture?

I love the way it protects itself from high wind speeds by simply closing the shutters. One more safety addition would be lightning protection (very simple).

I wish you and your company much success!
Regards,
Rafael Silva.

We will be able to sell the Shrouded Dual Turbine Generator at a significantly lower capital cost per kilowatt of capacity than the wind turbines of our closest competitors. This is possible because they are designed for mass production and use of low cost materials, and our high output design. Our invention is revolutionary in that it uses shutters to control the amount of wind that flows over the turbine blades. The use of shutters enables the generator to continue producing power in very high wind conditions, and protects the turbine rotors in storm conditions. We expect to rate it for use up to 150 mph.
The limiting factor with wind turbines is drag. We have eliminated drag by placing our turbines into the camber of the foil, and by doing so we have created horizontal lift.
The Shrouded Dual Turbine Generator has a low radar signature, unlike horizontal axis wind turbines which produce a radar signature which can interfere with air traffic control. The low radar signature of our turbine opens numerous existing sites to wind power production.
Currently, the best small turbines on the market have a very small window of wind speed at which they can operate. The Shrouded Dual Turbine Generator will be able to operate up to 20 hours per day. With over triple the output of existing turbines, we will open up new markets by making our product attractive not only to the environmentally conscious customer, but also to the fiscally minded customer.
The majority of maintenance issues concerning wind turbines are related to bearing failure, issues with gearing, and use of the generator for rotor speed control. Bearings failing from going too fast and burning up is the number one issue. We use shutters to control the rotor speed so the bearings never end up going too fast. Bearings can last 30 years if they don't overspeed. These shutters also minimize the wear and tear on the generator, while producing power in high winds.

See our gallery for images of a 3.2 kW model.
http://royalwindturbines.com/index.php?p=1_9_Gallery