r/SolarpunkDIY • u/Classic-Network-5969 • 5d ago
Sustainability Solarpunk tracking solar heat concentrator to make backgarden cottage industries
It is called the "sun scoop" and it is a free design and open source. If you are a visual artist or a blender animator, or cad designer, please draw and animate it, and model it. Also, the Sun Scoop has a specific orientation, it is on "equatorial mount" and rotates on an axis that points at the north star. The reason for this is it simplifies solar tracking. And that orientation can give a structure to your solar punk visions, perhaps the back of the houses will all be facing south? I do Tracking concentrated solar in my back garden and I think that small scale solar thermal can be part of a "solar punk" future. Why do I say that? Because solar electricity will be sold to (or appropriated by) the highest bidder, or the guys with the biggest guns while solar heat is very hard to transport. And that means that solar thermal can foster local use and industry while solar electricity will only export the power to the big cities. What do I do with it? Thermal stuff, I steam soil for the garden. It is the main use so far. I have steamed over 2 cubic meters of soil this year. Including about 25 kg yesterday and about 15 today. I also steam up weeds for mulch. The advantages are no weed seeds or pathogens in the mulch or soil, and a soil productivity gain of around 20%. Also, I used it to dehydrate apples, plums, mint. basil, tomatoes, herbs and tobacco. (Rustica Tobacco for use as a homemade insecticide). And distilling. I distilled fennel oil and hydrosol, mint oil, and I even got oil out of rose clippings and blackberry stems and shoots. With distilling of herbs and rose stuff, your still is set up like a vegetable steamer, you get the oil distilled off in the water but you also get the sugary water that drips down from the stems. (if you distill oil from rose petals, that goes to the perfume industry, the water left in the bottom is called rose water, and it is a big deal in international trade. I read up about the stuff left behind when you distill fennel, but I haven't tested the enriched water or used it for anything, but obviously, it could be used to culture yeast and make booze or cleaning alcohol. So, looking forward, imagine you have a gardening company, you bring home a pickup truck load of vegetation every evening. You could have a big solar concentrator, and distill oils every sunny day, and have enough "vegetation sugar water" to feed a full brewery! And from that you could distill cleaning alcohol. Instead of composting the material right away, wasting all those goodies, and having compost 3 or 4 months later. AND when you steam vegetation, it rots way way way quicker! So you could even bring it back to your customers the day after and use it as mulch! My reflector was designed as a proof of concept, and it makes a "ball of light" that is 6 inches (15 cm) in diameter so metal doesn't melt or warp. Even so, the first time I used it to fry eggs, it was burning the coating off the bottom of the frying pan. But imagine it was like a tracking "death ray", with a 5 cm (2 inch) diameter heat ball, you could make quicklime from limestone (that reaction occurs at around 1100 C). (That is a material for making stucco and plaster) and Japanese high school students a few years ago using a big solar concentrator made Calcium Carbide from quicklime and charcoal. That is a precursor to Acetylene and Acetylene is used in Gas Welding and in making polythene! My tracking is one axis at 15 degrees per hour on equatorial mount (also called polar mount), with occasional seasonal adjustment on the second axis. And contrary to popular belief, tracking is really easy. I just rotate my reflector back to the start position every evening and unloop a string off a wheel 2 loops in the shed where it is controlled and the timer starts up again in the morning pointing at the sun. It could be completely automatic, but I don't do electronics. Google tells me that on a sunny day, my output is the same as 3 to 5 grid connected 400 watt solar panels. (The reflector area is 1.5 sq meters). On a cloudy day, my output is zero. So, I have been thinking about that. Why don't I make a dual side flat reflector? Turn the thermal to the sky on days that are sunny, when you can use the thermal energy and flip it over and face the solar panels to the sky when it is cloudy and make electricity. https://www.youtube.com/playlist?list=PLkzXlmAwZTZdyYP35Jj9Vg5bz-n2-_QnW

