evacuated tube -Solar Evacuated Tube Vacuum Tubes DIY Test in the Sun

January 14, 2012 – 12:27 am

** This is part 2 of tubes with a bottle of solar control and sun exposure. My website link for the results and videos are www.greenpowerscience.com Video Rating: 4 / 5

** It ’s been almost a year since I installed this solar-heated hot water to generate hot water for my shower summer. This video is an update that covers how the unit is running and hold-ups. I also discuss some of the science behind how the unit actually works. A few months ago, we had a (weak) hurricane coming through the area. Some small limbs blown off a tree and crashed near the unit. They caused no damage. If you are interested in installing one of these units, and questions, please feel free to contact me via Skype. My username is: john_by_the_creek. When you send a contact request, please reference “solar water heater.”

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  1. 27 Responses to “evacuated tube -Solar Evacuated Tube Vacuum Tubes DIY Test in the Sun”

  2. Thats pretty neat. Those things have all kinds of possibilities.

    By carr869 on Jan 14, 2012

  3. How do u make it ?

    By GOP4USA on Jan 14, 2012

  4. we all know that heat wil not traverse a vaccum. the real trick is to use a gas that makes it hotter! look at mars it forms a natural laser because of the co2. the first solar ac was a evcated tube system, that used co2 to increase the temp in the manifolds. eazy to make co2 with vinegar and bakesoda. and put inside of jars to exp. with. dont wait for dan try it yourself.

    By advthinker on Jan 14, 2012

  5. @GREENPOWERSCIENCE hey what would happen if you use argon instead of a vacuumed atmosphere

    By csxconductor100 on Jan 14, 2012

  6. Planck Black Body Experiment. For heating. Nifty Keen-O!

    By MrTLMora on Jan 14, 2012

  7. I think the experiment could be flawed. this only shows the greenhouse effect.
    the comparison should be a container with a vacuum against a container with plain air or other gases.

    By KingLutherQ on Jan 14, 2012

  8. I feel that all hot water tanks for new residential & commercial builds, should have passive heat exchangers installed in them. This should become mandatory.

    One way of supplying the heat exchanger would be to design a ridge vent system that works in two ways. During sunlight, the ridge could be designed to become marginally hotter than the temperature of the ambient attic air. This would naturally draw this air to the vent. It would cool the attic and at the same time heat the hot water.

    By paulj0557 on Jan 14, 2012

  9. i boiled water in a coke can just by leaving it in the sun Thanks AUSSIE sun

    By jackson593 on Jan 14, 2012

  10. use a tire stem for the vaccum port, you can also just obtain the insert of the tire stem and thread into brass or aluminum plate. Also rember to prep clean the glass .. use a belt sand with 100 grid sand paper to soften round over the edges of the glass very quicly, dont apply to much force the sand paper will do the work. Also clean and prep the black gass pipe and paint with flat black metal paint. to creat a solor conductor. Join lenght of vaccum tube as needed insulate exposed pipe

    By eloid777 on Jan 14, 2012

  11. To expand on this idea , why not make diy square glass tubes, cut 2.5″x 4′ long
    strips of glass 4 per tube. Make a V or U shape trough to help align the glass at right angles use spacers to elevate the glass so the silicon (high temp silicon300 c) seal the glass, leave over night to dry. The silicon the 2 halfs same way when dry. Prepare brass or alunmin end plates with a hole in them for a black gas pipe hole should be larger to allow for expandtion of pipe and place of silicon around the pipe

    By eloid777 on Jan 14, 2012

  12. Would a parabolic mirror in a vacuum be more efficient or am I missing something?

    By dbnstrikeman on Jan 14, 2012

  13. @lerch25
    Two important things to know which will explain how this works.
    1. A vacuum is indeed an insulator. The greater the vacuum, the better the insulator.
    2. Most of the energy from the sun arrives as light energy and is converted to heat energy when the light energy strikes any object that is not white. (Ice and snow acts as a mirror and reflects the light.) The light energy stimulates the molecules in the object it is striking to vibrate, hence producing heat.

    By Mrbryllis on Jan 14, 2012

  14. if this is part 2 where is part 1 ?

    By xadam2dudex on Jan 14, 2012

  15. thank you for the demonstration.

    By datzfast on Jan 14, 2012

  16. @esnap agreed it would be a more meaning full demonstration. after all the question should be is a vacuum worth the trouble.

    By datzfast on Jan 14, 2012

  17. @GREENPOWERSCIENCE then why the heat of the sun can reach the earth if space has no air particles????? :S

    By Snither on Jan 14, 2012

  18. Dan , will you be doing anymore updates anytime soon? i am working on pool heater with this concept and would love to see more experimentations.

    By joulian0720 on Jan 14, 2012

  19. Good work :D

    By struchol on Jan 14, 2012

  20. So i’m guessing the vacuum acts as an insulator?

    By youtubasoarus on Jan 14, 2012

  21. @lerch25 Hi,

    Heat conducts through air molecules. A vacuum has almost none so it keeps heat inside. This is just like a regular vacuum thermos but clear outside and dark inside so sunlight can build heat faster.

    By GREENPOWERSCIENCE on Jan 14, 2012

  22. could you explain the physics of why this happens? I am baffled by this

    By lerch25 on Jan 14, 2012

  23. why dont we have more uses for vacuum seals?
    double glazed windows, ovens lined with vacuum walls, houses with vacuum walls rather than pinks batts
    we could benefit alot more from this technology
    the bottle you made on this video would be excellent for heating up my lunch time soup, maybe even make a cup of tea, saving me money boiling the jug

    By edy066 on Jan 14, 2012

  24. That’s not even a real comparison. Put the bottle into a chamber without a vacuum so that it’s not losing twice the heat as the one in the vacuum chamber. Just the insulation of having a pocket of still air on the outside of the bottle will make it compare with the vacuum chamber. I think the whole vacuum thing is bs, or over rated at least. Make two identical bottles and chambers. Pull a vacuum on one, and not on the other. Lets see the results then…

    By TheSporesguy on Jan 14, 2012

  25. are there any vids you might suggest to demo this ? I am trying to understand it :)

    By joulian0720 on Jan 14, 2012

  26. Forget the bottle. Use copper pipe. You need pipe for a loop system anyway, right? Now that I’m freezin’ I wish I would have tried this experiment during the summer.

    By 4sineweaver2 on Jan 14, 2012

  27. Hey B:

    My original “back-of-the-envelope” calculation put the payback at about 4 years, but a viewer of my original video on the system believes it will take longer.  Based on the reduction of my LP gas consumption to date, I’m guessing my original estimate is in the ballpark.

    By watcherjohnny on Jan 14, 2012

  28. Neat stuff. Based on the amount of money saved on LPG, how many years will it take to pay off the original investment?

    By bunkermunk on Jan 14, 2012

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