New Unique Solar Design Is Highly Efficient
by Michael Edwards
You would not believe what we at Green Products found (and no they are not UFOs). Can you imagine a field planted with silver balloons as far as the eye can see, or a hillside covered with silver balls? It’s not Christo’s latest pop-art install, but rather, a solar farm. This is what Cool Earth out of Livermore, California envisions in the very near future. The solar collection concept is not new, but the concentrator is different from anything seen before on any renewable energy product.
One of the areas of concern with the current flat-panel solar design is cost. Flat-panel designs require metal cases, rigid mounting hardware, heavy glass and large amounts of cell material. The cost per watt for solar panels is generally 5 to 7 times greater than conventional power plants. This is no longer true with the solar balloon system.
One side of the balloon is made from reflective silver Mylar plastic. The other half is transparent to allow in sunlight. The silver material is parabolic-shaped to concentrate the sunlight on to a single point to achieve maximum light concentration. This is why high performance solar cells are used.
This unique design can concentrate the sunlight so well, it produces 300 to 400 times more power per square inch of solar cells than traditional flat-panel solar systems. By regulating the air pressure inside the balloon, they can focus the concentrated sunlight directly on the photocell. The air regulating system is designed to maintain the proper balloon size as the outside air temperature increases or decreases.
The basic structure of each orb is simple. It has a lightweight circular metal frame with an arm that holds the solar cells near the top of the clear side of the orb. Even though the balloon is eight feet in diameter, the frame is the only rigid component of the basic design. It connects to a point where external hardware is attached for mounting.
Like all solar designs, the system will not be used as a base power plant because the energy collected during the day cannot be economically stored for nighttime operations. On the other hand, the system will be an ideal “peaker” power plant to be used during the hot summer months when energy demands are high.
Another of the aspects we find most interesting at Green Products is how the balloons are linked together with wire, wood and sheet metal. We are also impressed at the lack of limitations that are imposed when the systems are installed and how they eliminate the destructive heat that destroys most solar cells. Soon this system will be installed and go online. Check it out.
Michael
