Water Power -DIY SOLAR TUBES EVACUATED VACUUM TUBE SOLAR HOT WATER Boil water with the power of the SUN

** Boil water only putting it in the sun. www.greenpowerscience.com This is a simple process to make your own solar vacuum tube evacuated from a bottle and a pot of $ 2 from Walmart.

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25 thoughts on “Water Power -DIY SOLAR TUBES EVACUATED VACUUM TUBE SOLAR HOT WATER Boil water with the power of the SUN

    This is incorrect. the thermal of conductivity of air is unchanged until you reach about 1,000-10,000 times less than air pressure. You are experiencing insulation due to the outer tube much like wrapping a hot pipe in insulation. But the vacuum is not improving the insullation. True vacumm tubes have a stagnation temperature of about 500 degrees F. You seem to struggle to get to 140 deg F.

  2. @kozybearcat The “10,000 less than air” firgure you have there comes from the old electron vacuum tube industry. And even within that industry the 10,000 less than standard was about QC and high performance over a long time. Im using some electron tubes made in the 50′s (for instance).But it was not required to simply make working tubes. There is a lot of hoodoo mythology around electron vacuum tubes.

  3. holy implosion hazard batman.

    I dunno what the rating is on a vase from walmart :-) Hopefully somewhere near 1 atmosphere.

  4. @Perfectg The vaccum would then depend on the temperature you use and ordinary glass has a tendency to crack if heated or cooled too quickly.

  5. @GREENPOWERSCIENCE Yes, but in -40′C weather or with heat expansion… that is where you will see the advantage of proper vacuum. If you are using glycol (ethyl or propyl) to run the system at a higher temperature or in subzero conditions then you will see an even greater difference between a properly evacuated tube. One way you could effectively increase the vacuum here is by putting a torch to the tube while pumping… when the temperature comes back down you will have more vacuum.

  6. @GREENPOWERSCIENCE One good source for a vacuum pump is an old refrigerator or freezer. The freon pump can be used to pull a powerful vacuum. Might want to make sure you have a vacuum gauge if you use one, otherwise you’ll have a problem with implosions, hehe.

    I know this is an old video but can this method be used as tank to hold hot water for a boiler? What i mean is by large scale it can be used to hold 100L + of hot water.

  8. The other technique you describe for creating a vacuum by lifting the glass isn’t going to create much of a vacuum. It might be 1″ H2O, which is -0.036 PSI. That is hardly a vacuum. There are other ways of creating a vacuum though that I’d like to see you explain for people doing projects. If you’d like some of the techniques, send me a message and we can discuss them.

  9. Nope, any vacuum contains less atoms, less atoms equal less conduction, less conduction equals greater heat retention for this process.


    The professional tube in this video has a vacuum created simply by the heat making glass process then from cooling. It boils water in plain sunlight.

  10. This is silly. The vacuum created does nothing useful. You need 10,000 less air than atmospheric to do anything. This level is not really do-able by a DIYer. Do yourself a favor and just skip the vacuum step.

  11. Dan, if you play a blowtorch into a cooled glass vase just before you drop the vase down the contraction will suck the epoxy right up into the vase without any adjustments.

  12. Another EXCELLENT video from D&D!!!!
    Hint: try sand-blasting the glass parts, where you want them to bond to the resin. This allows a much firmer bond! GREAT WORK!!!

  13. Instead of using a vacuum pump (as many folk don’t have access to one) then you can simply heat the vase with the hole drilled in the resin open and then put a stopper in it. As the air inside cools you will end up with a vacuum. You can almost create what ever vacuum you need using this method easily enough to implode your vase so go gentle to start with. A little bit of water inside acts as a vacuum lost indicator as water will remain vapour in a vacuum but condensate out if you lose it.

  14. 6:09 Nice catch, lol.

    Great videos by the way. You have inspired me to try out a few of your ideas on my own home. Keep them up! Hope to see more.

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