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This type of solar still is ideal if you are camping in a hot climate or stuck in the desert and you need to extract some clean drinking water.
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On any camping expedition, remember to take sufficient water with you for the amount of people and time you will be away. This type of still should only be used as a demonstration or in emergencies, and does not provide a consistent reliable method for providing water for your travels, beyond basic, emergency needs.
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Project 15: Build a Solar Basin Still
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Figure 7-4 Diagram of a pit solar still.
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Figure 7-5 A solar still in operation. Image courtesy U.S. Department of Agriculture Agricultural Research Service.
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Project 15: Build a Solar Basin Still
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Metal U-strip Black silicone Low-profile guttering Low-profile guttering end pieces Tube Two stop cock valves
Plywood/oriented strand board Framing Screws Glazing (glass/polycarbonate)
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Jigsaw Screwdriver Squeegee
of the wooden box so that it gets a thin uniform coat. Less important are the sides, but you should ensure that by the time you are finished, the inside of the box is fully lined with silicone. At the front of the still, that is to say on the shortest side of the box, you need to make a small gutter. This gutter will serve to collect your purified water which will run down by the force of gravity from your glazing. You need to make this gutter out of a waterproof material. The low-profile guttering sold for sheds and outbuildings is ideal. A hole needs to be drilled in the side of the frame of your still, and a pipe introduced to allow you to siphon off the clean water. The silicone has two functions. First of all, it acts as a black collector surface, absorbing radiation and creating heat. But secondly, it protects your wood by making the enclosure waterproof. On top of this sealed box you need to put a sheet of glazing. This needs to be sealed around the edges with frame sealant to ensure a good watertight fit. The brackish water should never be allowed to rise above the level of the guttering, as it would contaminate the clean water. The whole solar still is illustrated diagrammatically in Figure 7-6.
Project 15: Build a Solar Basin Still
This project is scaleable depending on your requirements for water, which is why no specific measurements are presented. First of all, you will need to calculate your water needs. Solar stills can generally produce around a gallon of water per 8 square feet, this is around four liters per square meter. This assumes that your collector receives 5 hours of good sunlight per day. Obviously the performance of your still will be highly variable, depending on the amount of sun your collector receives. You need to construct a wooden box from plywood or oriented strand board, with gently sloping sides. This is well within the capability of someone with even modest carpentry skills. At a position near the tallest side of the box you will need to drill a hole and insert a pipe with a valve that can be opened and shut, to allow you to introduce brackish water to be purified. Then, take a squeegee and some black silicone. You need to spread this mixture on the bottom face
Figure 7-6 Diagram of the basin type still.
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8
Solar Collectors
The sun provides an abundance of energy over a wide area; however, often our solar devices are fairly small, and so receive little solar energy. So what if we could take the solar energy from over a wide area, and concentrate it into a smaller area This makes a lot of sense, because it means that the small area receives a much higher amount of solar radiation. In the book Epitome ton Istorion, John Zonaras wrote: At last in an incredible manner he burned up the whole Roman fleet. For by tilting a kind of mirror toward the sun he concentrated the sun s beam upon it; and owing to the thickness and smoothness of the mirror he ignited the air from this beam and kindled a great flame, the whole of which he directed upon the ships that lay at anchor in the path of the fire, until he consumed them all. This deadly weapon was allegedly used in the siege of Syracuse in 212 BC like I said, the idea is old! So this is what MIT did . . . Actually, the sun has quite a phenomenal power when concentrated into a small area, its power is truly extraordinary. If you were a ghastly child you might have burnt ants using a magnifying glass well what goes around comes around: remember that when a large ethereal figure holds a magnifying glass over you. One of my memories of junior school was gathering in a corner of the playground where a group of children were concentrating the sun onto some logs covered in tar and making smoke. Although we did not know it then, we had made a solar collector. The chances are you re getting tired of reading this, but this is not a new concept, in fact, the Greek s purportedly had a weapon of mass destruction, that harnessed the power of the sun to set fire to enemy boats. Archimedes you may have heard of him he found a few things out, like the concept of the Archimedes screw and the theory of displacement. Anyway, it is fabled that he had a weapon that was created out of mirror-like bronze that he could use as a death ray this ray essentially reflected concentrated sunlight! First they got loads of students on the 2.009 course, loads of chairs to act as stands and loads of mirrors (Figure 8-1). Being MIT, they got the cash for this kinda stuff! Next they lined all the mirrors up so that the sun s energy was concentrated onto the model of the hull of a boat voila! or should that be Eureka Flames! (Figure 8-2) Here we can see the serious damage done by the flames to the wood (Figure 8-3)! With a larger mirror area this could have been a formidable weapon! In Figure 8-4 we see how MIT used a similar technique to the one you will use in the next project cover each mirror up with paper, line each one up individually by removing the piece of paper and adjusting the mirror. And then, when they are all lined up, remove all the bits of paper as fast as you can without disturbing the mirrors! And as ever, with every serious piece of technological investigation, there is the back of the paper bag calculation (Figure 8-5). Now it s your go!
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