Hot air towers

=== tower ===
https://www.youtube.com/watch?v=L_KRDJpnVx0 DIY solution. Inject plastic sheeting into squares for construction. See Preciousplastic.com for shredder and injection mold machine. Collect as much scrap metal and glass as you can find, the tower shown in the image creates between 500 and 1000watt, enough to power your micro Greenhouse. an alternative to the steel structure is using a solar heliostat to melt sand into obsidian frames for glass to attache. 
The energy at the exit port increases considerably by encircling the inclined base of clear or black painted glass? spaced around the tower center with heliostat mirrors spaced several meters away from the outer perimeter of the glass sheeting, using open loop tracking. 
The sun tracking precision isn't as important as it would be with a small thermal element because the surface area of the inclined target glass is so large. This reduces the labor in cleaning of the inclined base, due to the air that it sucks in fouling the mirrors on the inside. Each base mirror section pivots like a door for easy cleaning. The exit temperature is much higher with surrounding heliostats aiming at the base. Obviously scrap glass sheets is used to keep costs down, larger sheets are assembled out of smaller ones with fire sealant paste(1200c) and metal struts. 
The surrounding heliostats are made out of cheap plastic timber with reduced size, negating wind loading issues. Any design which eliminates quantities of steel is preferred, especially if a high resolution closed loop tracking device can't be procured. https://www.popularmechanics.com/science/energy/a25576543/renewable-limits-materials-dutch-ministry-infrastructure/ article written in 2018 stated we don't have enough steel and neodymium for wind/solar, with Russia and China's production imploding, this situation will force the usage of alternatives to steel. Start collecting neodymium magnets if you can . 
Open loop tracking (Solar_Tracking#software) is done with a single mega2560 calculating the suns position and RS485 signal loop to each heliostat ATTINY controlling the small dc motors azimuth and zenith orientation as per Arduino irrigation. 
https://en.wikipedia.org/wiki/Wind_turbine ".....Turbines with a horizontal axis can be installed in a ring around the base of the tower, as once planned for an Australian project and seen in the diagram above; or—as in the prototype in Spain—a single vertical axis turbine can be installed inside the chimney....."
 
https://www.youtube.com/watch?v=Qhi4ybqDrMs diy experiment 
https://www.youtube.com/watch?v=e2BT5yENlLc 
https://www.youtube.com/watch?v=XrGsPBEQLP8 
=== large commercial ===
https://www.youtube.com/watch?v=pTkmTsKLRq0 
=== Air tower ===
https://www.youtube.com/watch?v=2japP5d0qCI Hot air is cooled down with water at the tower's top, creating a 100km/h wind draft that turns turbines at the bottom. This allows for 24hour operation as the hot air is generated after sunset with a heat exchanger from the MoltenSalt solution, that soaked up heat during the day. A Solar]] energy furnace heats the salt during the day. 
=== energytower.org ===
https://web.archive.org/web/20120120143459/http://energytower.org/
This is a project to design and build a system that uses a combination of direct and indirect solar collection to generate electricity and store thermal energy in an economical, environmentally friendly, scalable, reliable, efficient and location independent manner using common construction materials. The project is being managed with a similar methodology to Open Source Software Development and the ideas and contributions are being published openly on the Internet without an attempt to secure patents. The hope is that with an open philosophy that the project shows similar Rapid Application Development and success as Linux and other Open Source Software projects and provides a system that can meet future energy requirements in a sustainable manner.
=== links ===
https://www.youtube.com/watch?v=XCGVTYtJEFk water condensation at night, creating plant growth between greenhouse inspite of the heat. 
https://www.youtube.com/watch?v=8yf8hiBOkLk 
https://www.youtube.com/watch?v=cEcRZ4zY_TM 
https://www.youtube.com/watch?v=yuOXgTC0SRc 
https://en.wikipedia.org/wiki/Solar_updraft_tower 
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Category:Energy
Category:Solar energy
Category:Wind energy