Tracking the Sun
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    Naturally, if you live South of the Equator, the lable "South" becomes "North," but the principles of opperation are the same.

    Commercially, whole arrays of reflectors, each electrically track the Sun. Itís probably the most expensive way possible, I suspect, to discredit concentrated solar energy, so you'll buy their expensive photovoltaics that are only about 15% efficient, so you'll have to buy lots of them. There exist many better ways that make concentrated solar power practical. In fact, you can even make it work all night, and in the winter. And sell energy to a utility.


    First of all, an optically perfect arrangement isn't necessary. Plain aluminum foil will reflect the sunshine quite well, you only have to direct it from where you get it, to where you want it. In bright sunshine you may get about 300 BTUs per square foot. (29,405 jouls/meter2) per hour.

   
The solar cycle has 2 patterns that remain the same. First, is the daily cycle, and Second, is the Annual Cycle, pictured in Figure 2. As long as your collection array is able to handle these variations, it will work well.

    Your aluminum foil only has to be placed properly, and held still. One of the easiest ways is with aluminum foil covered shingles you can make yourself, not only inexpensively of Natural Fiber Reinforced Concrete, but then make more to sell to others. When adjusting, align the first one so your captured energy goes where you want it to, then as you adjust each successive one, leave the first one on, and cover the others so you'll only have to deal with 2 spots. When they're all aligned, then uncover them all.

       The first one should track the Daily movements of the Sun along the movable array of reflectors, that then redirect the energy to one of 2 positions below.


   Figure 3 shows a Reflective Shingle face down, the way you can manufacture them. The shiny side of the aluminum foil is put face down, and the NFRC placed on top, until it cures. To mount them, just turn them over and adjust each one to reflect the Sun's rays to where you want them to go.

    There is no reason to waste the property underneath this solar collection array, so mount them up on a trellis, then the land below can be used as you wish. And the shade is much cooler, especially if you live in the desert where shade is important.

    In this arrangement a whole group of reflective shingles are focused onto a moving reflective collector of either mirrors, or reflective shingles made of NFRC, using refractive cement, because of the higher temperatures encountered.

    The position of this focus moves along the Annual path, and the Daily path. The Daily path is compensated for by the array of movable reflectors, which are much smaller than the commercial variety. This array moves slowly, and automatically, to compensate for the Annual solar position as the Earth travels around in its orbit. The position of each reflector of this array is fixed on the moving mounting platform to redirect the Sun's energy to a common focus.

    This common focal point can get quite hot. In theory it can reach the temperature of the Sun, but certainly, such collectors, such as the one in France, can melt a foot-wide hole in a piece of ľ-inch steel plate in 30 seconds. How hot depends on how big your reflective shingle array is. The bigger it is, the higher the potential for creating a very hot focal point, so it's important to fence it off to keep people and animals away.

    As this first focal point moves Daily along the high temperature collection array, it's redirected to one of two special foci. Since the final goal is to focus the Sun's rays down into the earth, into a well, we must first create a beam of very high energy, along a path that goes through the pivotal path of the moving array.

    To do this, we have a pair of Ellipsoidal Mirrors that have the quality of focusing our collected energy into a beam, we are able to direct down a well.

    Thus, as the moving array of high-temperature collectors is pivoted, the high temperature beam will remain stationary.

    It is believed by some, that such Ellipsoidal mirrors were used by Archimedes in 250 B.C. to set Roman ships on fire, but it's the same method used nowadays to shine a spotlight on actors on a stage. You can purchase such mirrors, but I'll show you how to make them inexpensively.

    First, I will deal with the moving mirror array. The array of mirrors is moved all together at once each day by a motor that tracks the annual movements of the Sun. Essentially there is a shade on the array that is not a point, but a line, so that solar sensors remain in the shade all day long, but are in the sunlight when movement is needed.


   If the array is aimed by a motor that drives the array first in one direction and then the other, a 2 directional drive system is not needed. If it goes just a little past each solstice and the motor stops in the shade, it will stop briefly going in the wrong direction, and then will continue until it stops in the proper direction. As the Sun changes position it will automatically track it from then on until the next solstice. When the motor stops it leaves the mirror array aligned with the Sun, and the shade on the array. Figure 5.


    The captured energy is then directed by the individual mirrors into a pair of Ellipsoidal mirrors into a very hot beam. Ellipsoidals have 2 foci. Light which comes in near one foci, is bounced by the Ellipsoidal mirror toward the other foci. After repeated reflections, a line is formed between the 2 foci, which of course is very hot.

    There exists a possibility that you may collect too much energy for your homemade ellipsoidals, and you may melt them, but keep adjusting, and add many such mirrors if necessary.

    You can make the ellipsoidals on a wood lathe, it's similar to making a bowl. Except the cutting tool is connected to a pair of connectors that will be at the foci of the finished product. A non-stretchable wire, such as a small cable, is connected between them as shown, to guide your cutting tool.

    After the ellipsoidal bowls are made, line the inside with aluminum foil as best as you can.

   One of the ellipsoidals has a hole in it as shown, to let the concentrated sunlight escape. This beam is then directed down a well into the earth.

    It may take up to 3 years to heat up the earth, but this heat has been stored, and is now available 24/7 as you need it. It's quiet, long lasting, very strong and free. From this you can operate a jet turbine or other alternator to make electricity not only for your own use, but to sell also.

    You certainly do not want to melt the well. So make it out of tile pipe maybe with broken pieces of floor tile as a bottom target. Tile shouldn't melt, and so the captured solar heat can be stored in the earth.

    And it's Earth compatable.


    Thanks for your interest.
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