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
Dan, you are one of my early inspirations to do DIY projects, and I have learned so much from your videos. Thank you for your creativity and information. I can't thank you enough.
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.
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!!!
Definitely would love to see a comparison between your vacuum solar unit and a regular beer bottle with the same black paint on the back. Great job guys!
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.
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.
Thank you for the cool comments:-) I think you would need a much larger surface area. I think large sheets of double glass could do it. Consider the coroplast heater with a glass cover watch?v=SF_mEoFRSAQ
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.
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
I think your on the right track. I've often thought of a way to create a dependable vacuum Tube. You almost need an old lightbulb factory. I'll be watching your future progress. I used polycarbonate to cover my panels. they got so hot they melted two inches deep into blue SM foam in Half hour.
Hi Dan, thanks so much for your great videos, I can't get enough of them. I have seen other videos how solar evacuted tubes work. Could you put a vacuum sealed copper tube into the inner bottle and will it heat up. If so could you use it in cold weather to heat your vehicle while your indoors or have a long enough copper tube, you could attach it to your home like a solar heater. The heated tube would be exposed indoors, the ceiling fans would distribute the heat?? Thanks again, great videos!!!!
I have enjoyed watching this video dan I was thinking About the temperature that the resin would. Soften and it's not that high that it would lose the vacuum perhaps a high temperature silicone if enough was applied you can hold it.
Hello ! Nice tuto !! Have you tried making vacum / gas insulated tubes réusing neon glass tube ? There is soo much going to trash !! I would like to try with an insulative gas, do you know wich is the more simple do make/get and non toxic ? Co² ? Argon from welding ? Freon (i dont know where to get that..) Thanx a lot for sharing this very usefull experiments !!
Drill it upside down and the debris will fall away from the bottle rather than inside. Vacuum pumps are available at harbor freight for less than $10 bucks. Just a few things I have found.
Wow! That's awesome, it makes perfect sense now. Thank you for the prompt response. Haha, using the same principles there are 'attack' satellites in space that simply "spray paint" other satellites, thus heating them up and eventually destroying them. Awesome videos by the way. If you were to put all your videos on a CD, I'd buy it.
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.
Use clear glass but black water. Put ink in the water. Maybe use ethanol and printer ink instead of water - condense vapour in a water bath to heat the water.
I like the idea. What I want to try is to cut the bottoms out of two wine bottles then connect them with a PVC coupling. The coupling would be where you put in the valve(and vacuum gauge). Then put a pipe all the way through both bottles, seal with epoxy putty, and pump the air out. Do you need the liner bottle for this to work? You could put two beer bottles inside as well butted at the ends and sealed to the pipe. I'm thinking a check valve on the intake and then a pressure relief valve on the other end. I also want to make a makeshift vacuum by re-purposing an old 20lb propane tank. Put a ball valve on it open with some water in it, bring a cup of water to boil inside, then shut the valve off to pull a vacuum off of a secondary pipe on a T. Come to think of it, I could prob use a pressure cooker. Just pop tubing on the vent after bringing it to a boil and stick the pot into ice water.
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
Couldnt you use a basic deep food canner, and utilize a jar within a jar, sealed(steel weave putty), then "can" them in the pressure cooker, to make the vacuum seal? Also Im curious if there is a DIY method of getting that coating that gives the higher infrared spectrum with the interior bottle, rather than the black?
@GREENPOWERSCIENCE 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.
About vacuum. You need recent vaccum to have benifit of it. If you don't belive just put two same devices on the sun, one without vacuum (but closed) and other with just 1/10 of atmosferic pressure. The result is near same. The change is introduced probably beacouse of watter vapour has higher transfer ratio as air and air is not dried. The real benifit of vacuum start's under 1 torr vacuum, and that's hard to maintain in hobby system.
Nope, any vacuum contains less atoms, less atoms equal less conduction, less conduction equals greater heat retention for this process. watch?v=AFwG1RPbxlc 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.
@GREENPOWERSCIENCE 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.
Hey, this is a question off topic about fresnel lenses... I'm curious what materials have proven inflammable (at least w/ the "wider" lens.) Will something like a space blanket or similar material reflect enough light to prevent igniting after prolonged exposure?
@GREENPOWERSCIENCE you don't need any sun light if the vacuum is as pure as the vacuum of space. in a pure vacuum, with no pressure, water doesn't resist in a liquid form, it turns straight from ice into vapor. that water should have boiled at room temperature. what is amazing to me is that there is so much pressure in our atmosphere, that at the right temperature water will retain in a liquid form just because of air pressure. it isn't how little pressure is in a vacuum but how much pressure e
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
What is the minimum amount of vacuum needed to produce this effect? Say I had two large window glass panes with a serpentine zig-zag channel made of 1/8" x 1/8" sticks where the channels would be 1/2 wide. Could you suck out enough air to make this efficient? I know that round is strong, but it's also hard to make...
Hy! Nice tutorial Dan! However: I was researching this the other day, and came by the information that soft vacuum is not much good for this purpose. We get fewer atoms to carry the heat, but since they are more free to move around they travel a lot faster, negating the effect. Then i looked up how hard a vacuum a thermos has, and almost fall off my chair. If you wold do the water test with a thermos it would fill 99,9%. Crazy! Also dangerous.
@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.
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.
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.
Good vid Dan,, I always enjoy your informative vids man,, I really liked the table saw circle tip! Bill- Ohio ps check out my channel for some cool stuff too.
your generating heat with glass components? glass is a natural heatsink, it dissipates all heat. These would be far more effective in polycarbonate, acrylic or perspex. ' you can use silicone but you are going to need to get this off' - Silicone is ideal for easy removal in all situations and does well against pressure. Simply remove silicone with abrasion or a blade.
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
Dan, you are one of my early inspirations to do DIY projects, and I have learned so much from your videos. Thank you for your creativity and information. I can't thank you enough.
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.
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!!!
Anytime I wonder if I could DIY something, you two are ALL OVER IT.
Definitely would love to see a comparison between your vacuum solar unit and a regular beer bottle with the same black paint on the back. Great job guys!
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.
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.
Thank you for the cool comments:-)
I think you would need a much larger surface area. I think large sheets of double glass could do it. Consider the coroplast heater with a glass cover
watch?v=SF_mEoFRSAQ
The clear vase allows for sunlight to absorb on the inner bottle filled with liquid. The vacuum reduces the heat loss.
watch?v=2frM1wSciV4
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.
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
I think your on the right track. I've often thought of a way to create a dependable vacuum Tube. You almost need an old lightbulb factory. I'll be watching your future progress. I used polycarbonate to cover my panels. they got so hot they melted two inches deep into blue SM foam in Half hour.
strips of wood to raise the tube to even up the resin...FANTASTIC!
Nice, now I can make some hot tea on the sunny winter day, without fire.
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.
I must have missed something. This os all new to me though.
What is the purpose for doing all of this?
what about filling the glass with an inert gas instead of a vacuum? like argon or helium?
Hi Dan, thanks so much for your great videos, I can't get enough of them. I have seen other videos how solar evacuted tubes work. Could you put a vacuum sealed copper tube into the inner bottle and will it heat up. If so could you use it in cold weather to heat your vehicle while your indoors or have a long enough copper tube, you could attach it to your home like a solar heater. The heated tube would be exposed indoors, the ceiling fans would distribute the heat?? Thanks again, great videos!!!!
Hi,
The can boil water just by placing them in the sun.
I have enjoyed watching this video dan I was thinking About the temperature that the resin would. Soften and it's not that high that it would lose the vacuum perhaps a high temperature silicone if enough was applied you can hold it.
For high heat applications I guess you could use a couple of borosilicate beakers. and maybe some plaster to seal it.instead of the epoxy,
Hello ! Nice tuto !! Have you tried making vacum / gas insulated tubes réusing neon glass tube ? There is soo much going to trash !! I would like to try with an insulative gas, do you know wich is the more simple do make/get and non toxic ? Co² ? Argon from welding ? Freon (i dont know where to get that..)
Thanx a lot for sharing this very usefull experiments !!
Drill it upside down and the debris will fall away from the bottle rather than inside. Vacuum pumps are available at harbor freight for less than $10 bucks. Just a few things I have found.
Wow! That's awesome, it makes perfect sense now. Thank you for the prompt response.
Haha, using the same principles there are 'attack' satellites in space that simply "spray paint" other satellites, thus heating them up and eventually destroying them.
Awesome videos by the way. If you were to put all your videos on a CD, I'd buy it.
"You're also going to have to drill a hole on your worktable" xD
Hey Dan, try to run your steam engy of that. It would be cool to know if that will work.
@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.
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.
Use clear glass but black water. Put ink in the water. Maybe use ethanol and printer ink instead of water - condense vapour in a water bath to heat the water.
Thank you very much for sharing this valuable information.
I like the idea. What I want to try is to cut the bottoms out of two wine bottles then connect them with a PVC coupling. The coupling would be where you put in the valve(and vacuum gauge). Then put a pipe all the way through both bottles, seal with epoxy putty, and pump the air out. Do you need the liner bottle for this to work? You could put two beer bottles inside as well butted at the ends and sealed to the pipe. I'm thinking a check valve on the intake and then a pressure relief valve on the other end.
I also want to make a makeshift vacuum by re-purposing an old 20lb propane tank. Put a ball valve on it open with some water in it, bring a cup of water to boil inside, then shut the valve off to pull a vacuum off of a secondary pipe on a T. Come to think of it, I could prob use a pressure cooker. Just pop tubing on the vent after bringing it to a boil and stick the pot into ice water.
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
Couldnt you use a basic deep food canner, and utilize a jar within a jar, sealed(steel weave putty), then "can" them in the pressure cooker, to make the vacuum seal? Also Im curious if there is a DIY method of getting that coating that gives the higher infrared spectrum with the interior bottle, rather than the black?
@GREENPOWERSCIENCE
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.
About vacuum. You need recent vaccum to have benifit of it. If you don't belive just put two same devices on the sun, one without vacuum (but closed) and other with just 1/10 of atmosferic pressure. The result is near same. The change is introduced probably beacouse of watter vapour has higher transfer ratio as air and air is not dried. The real benifit of vacuum start's under 1 torr vacuum, and that's hard to maintain in hobby system.
Hey Dan I was just thinking, would it be possible to Fill the vacuum with a gas like between double pain glass window and would it make a difference.
Nope, any vacuum contains less atoms, less atoms equal less conduction, less conduction equals greater heat retention for this process.
watch?v=AFwG1RPbxlc
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.
@GREENPOWERSCIENCE
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.
Hey, this is a question off topic about fresnel lenses...
I'm curious what materials have proven inflammable (at least w/ the "wider" lens.) Will something like a space blanket or similar material reflect enough light to prevent igniting after prolonged exposure?
You could use a vacuum cleaner to gain the vacuum, Just that you will need to make an adapter for the large diameter hose.
@GREENPOWERSCIENCE
you don't need any sun light if the vacuum is as pure as the vacuum of space. in a pure vacuum, with no pressure, water doesn't resist in a liquid form, it turns straight from ice into vapor. that water should have boiled at room temperature. what is amazing to me is that there is so much pressure in our atmosphere, that at the right temperature water will retain in a liquid form just because of air pressure. it isn't how little pressure is in a vacuum but how much pressure e
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
also clear silicone transmits far more light than resin that emits an of yellow colour
What is the minimum amount of vacuum needed to produce this effect?
Say I had two large window glass panes with a serpentine zig-zag channel made of 1/8" x 1/8" sticks where the channels would be 1/2 wide. Could you suck out enough air to make this efficient? I know that round is strong, but it's also hard to make...
Hy! Nice tutorial Dan!
However: I was researching this the other day, and came by the information that soft vacuum is not much good for this purpose. We get fewer atoms to carry the heat, but since they are more free to move around they travel a lot faster, negating the effect. Then i looked up how hard a vacuum a thermos has, and almost fall off my chair. If you wold do the water test with a thermos it would fill 99,9%. Crazy! Also dangerous.
would a vacuum be possible on a container house by welding steel boxes to the inner shell then removing the air
@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.
Erm..pardon my question, but is this particular device even used for? Basically, what's the point?
it's used for solar hot water heaters
When do we get to see the water boil?
can i use epoxy?
Oh! I see someone else has the same idea as me.
Have you tried it?
Great quality thanks for the info Mark Tahiliani
All of your you tube videos are great, have you ever thought about sending any of these to mother earth news ?
You can buy a 22 inch long two and three quarter inch diameter thermal evacuated tube for $10 not now
What if instead water you put air?, will it heat the air also?
Nice job
Hmmm. Very interesting. I saw some of these, well, an array of big long ones, put on a roof to heat water.
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.
ahh i think i get it. Because its a vaccume, it lowers the pressure so water can boil at a lower temperature.
Sorry, I forgot. Why? Is there a practical application for this?
6:09... nice save XD
How do you heat the water exactly.?
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.
amazing vid, thank you
Great i get it now. Because their is no air outside the bottle the heat can't propagate back out to the environment.
help me out here cos I dont get it. How can hydrogen insulate better then uh,, nothing ?
What is the point of this project? What is it supposed to do?
holy implosion hazard batman.
I dunno what the rating is on a vase from walmart :-) Hopefully somewhere near 1 atmosphere.
Good vid Dan,,
I always enjoy your informative vids man,,
I really liked the table saw circle tip!
Bill- Ohio
ps check out my channel for some cool stuff too.
@GREENPOWERSCIENCE Pleace add subtitles in SPANISH ;)
your generating heat with glass components? glass is a natural heatsink, it dissipates all heat. These would be far more effective in polycarbonate, acrylic or perspex.
' you can use silicone but you are going to need to get this off' - Silicone is ideal for easy removal in all situations and does well against pressure. Simply remove silicone with abrasion or a blade.
all this work to make hot water lol
You gave me some super ideas. thanx!