DIY SOLAR TUBES EVACUATED VACUUM TUBE SOLAR HOT WATER Boil water with the power of the SUN
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Apr 132009
Boil water just by placing it in the sun. www.greenpowerscience.com This is a simple process to make your owns solar evacuated vacuum tubes from any bottle and a vase from Walmart.
25 Responses to “DIY SOLAR TUBES EVACUATED VACUUM TUBE SOLAR HOT WATER Boil water with the power of the SUN”
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Hi,
The vacuum is outside the bottle and offers great efficiency preventing heat loss. The water still boils at 212, it just has an insulator that allows sunlight to enter through the outer shell and absorb to the inner container. This allows heat to build without being leached into the outer environment.
Great i get it now. Because their is no air outside the bottle the heat can’t propagate back out to the environment.
Hi Dan,
Congratulations ! I am thinking on system to store solar energy and a “Dewar” vase is the best as you just demonstrate. I think a good system will be to make hot steam with parabolic system and exchange heat in a dewar vase that contain “molten salt” after that take the energy out with a system. Are you going to do this kind of system that will get definitelly ged rid off poverty in the world.
you are a very good man .
chris
Great quality thanks for the info Mark Tahiliani
You need a REALLY high vacuum to get much real benefit. I suspect you would see nearly identical performance using the double-wall setup without any vacuum at all.
Damn! Wish I could understand you. I am hearing impaired and there is no captioning provided for me to learn about this great invention.
thank you for all of your work and sharing it!
could you also clear acrylic pipe that works with regular scd 40 caps for an outer shell, or are there drawbacks to plastic?
Also, with a double wall and NO vacuum to compare the to methods.
Beautiful!
But why not just mold the resin with a tube already in place? You could put the tube thru the casting mold and seal the around the tube with clay, just like with the bottle neck. 
Refilling vacuum? Lol.
Great Dan thanks!
Gives inspiration for making a collector with double pane windows and a car radiator in an insulated box with glycol and a heat exchanger. Get some temps below 32F. Might also use a thermostat to control temperature need a bypass or bypassing thermostat. Looking for enough temp for 105F = 60F over ambient. Trying to get that may need your Lens or a reflector. Interesting project let you know how it works out.
Double pane windows often have a coating on them that filters out the IR light which you are trying to capture. Probably the best way to insulate between the glass would be to fill the space with hydrogen at atmospheric pressure.
help me out here cos I dont get it. How can hydrogen insulate better then uh,, nothing ?
Have you every tried to create a space of “Uh,, nothing and then keeping it sealed? Hydrogen is about as close as you can come to having nothing and it can be done under atmospheric pressure. The problem with Hydrogen however is that it too is hard to keep contained. So a gas such as Argon would actually be better.
Hey Dan, try to run your steam engy of that. It would be cool to know if that will work.
Dan, thanks for the information. I made one of these today (2 inch glass vase inside of 4 inch glass vase) and everything seemed to be fine, except I had some contraction with the epoxy and some cracking began in the epoxy. Not a problem since I used more epoxy to contain the cracks. I pulled a vacuum (25 in Merc) and let it sit for while in the garage. After about 1 hr the whole thing emploded. Sorry I wasn’t there to see it, but I did hear it. Will try again later with thicker glass.
The vacuum does not need to be that strong. The first one I did, the bottled popped loose and flew to the bottom shattering the glass. That may be what happened. You need a rim on the inner vase for the resin to lock on to. A rimless inner container will simply pop loose as resin has poor surface adhesion to glass. The method in this video is, the vacuum sticks the outer vase and the ridge locks the inner one in.
If they pop loose with a vacuum, they accelerate very fast.
My suspected the epoxy as the culprit. As it dryed it shrinks. The shrinkage caused excesive loading of the end of the large vase. I believe it yielded there and cause the emploding. The inner vase was still held within the epoxy mount as it had a lip to retain it. Oddly, the vacuum is still much lower then a common thermos bottles (10-3 to 10-2 Torr). I was still in the single stage vacuum area (10 to 100 Torr) which hardly qualifies for a vacuum according to Wiki.
Keep em coming! ty
2nd attemp worked ok for about a day. Day 2 the noise started. You know that cracking sound that is very unnerving. Split second cracks that make you pull away thinking it will implode. Oddly, there was no vacuum on the container. I finally figured out that the epoxy was breaking loose from the glass at about 1/8 inch per cracking sound. I’ve moved on to Borosilica glass tubes and heat pipes and having fun thanks to your videos.
Appreciate the DIY. John
Lastly, please don’t use the glass vases at Hobby Lobby. They look very thick, but it’s super thin in the center. Give the vases a pinch to check the thickness. I’d recommend beer bottle thickness which feels like 1/10 inch or 2.5mm. thanks
So old school computers used somthing like this back then?
This guy is right. Without a serious vacuum, heat will convect from the core to the exterior. Also, all that epoxy and its surface contact with the core will again provide a great method for heat conduction away from the core. Read the Thermos article on wikipedia for a real understanding of this project.
sorry, this was supposed to be a comment to purplesan on the next page. He stated that this is unlikely to work any better than the non-half-vacuumed version.
Also, there has been comment on using hydrogen as this wouldn’t require a serious vacuum. As I understand it, hydrogen, in terms of thermodynamic characteristics, is the substance of choice for use in stirling engines (practical characteristics aside – leakage, reactivity etc). If hydrogen was a heat insulator then I don’t believe a stirling engine could operate using hydrogen.
All of your you tube videos are great, have you ever thought about sending any of these to mother earth news ?