FRESNEL LENS 9 SUN COLLECTOR SOLAR POWER SPOT

[rhblakeman]

Yep when gas and electricity gets too expensive we'll all be starting wood fires for heat and cooking with the lens from the TV we can't afford to power anymore.

[Cjaz84]

OMG...I never put two and two together. LOL now I love fresnel lenses. We use them to induce prism and are a pain to apply....net tv that goes out...solar oven. Kinda feel bad putting them on glasses now.

[StativStakitKasket]

yes, but will it float?

[albertsauce]

honey yummmmm..........

[elijahvivio1996]

i have a screen from a old projection screen tv.... can i achieve something like this with it

[MistaJayRock]

@elijahvivio1996 elijahvivio You bet! Make sure you separate the Fresnel Lens from the other screens carefully. Make a frame around the edges to keep it flat when you use it. Pine works but it warps if not stored flat. Like a picture frame. (pine also gives you splinters if its cheap). It works well when the side with the Fresnel pattern lines faces the sun. Be sure to use eye protection. Sunglases are not enough. Get welding goggles. They are not expensive and worth it to save your retinas

[a10fjet]

make one the size of a house.

then california.

[conifergreen]

I had a fresnel lens that was one of those old TV screen magnifiers. ou could turn a small TV into a larger viewing area with it. I took it outside once to use it in the sun and was amazed at the power. It was so powerful that I could hold it on a piece of wood and run water from the hose and the wood would still burn.The water would boil away instantly and the wood was still on fire. I was afraid to keep it around the house so threw it away. Dumb move.These should be used for power generation.

[joshgura]

it would suck to have a pair of eyeglasses that were fennel lenses, ones eys would get fused to their skull so fast. it would be terrible.

[ZebbMassiv]

I wonder what this means to a professional glass artist

[pigpal2]

where can i get this? I WANT ONE SO BAD!

[GREENPOWERSCIENCE]

@pigpal2 check our website:-)

[MistaJayRock]

Oh and don't clean these with windex! It makes them cloudy.

[justinwiseman21]

6,000°C = 10,832F not 9800F sorry racheetah :(

[luiger123]

just for kill gigants ants! xD

[joshgura]

@luiger123 star ship troopers should take history lessons and learn about frennel lenses!

[XxstryaexX1]

melting metal= super hot glue

[pianokd11]

Can you try to melt some coins?

[bestamerica]

'

this fresnel len can use on the ants hole and kill it all ants

[olympustec6969]

this is great I love it!

[laithnour]

der, like how hot does it get, der

[AKA0987]

i have been told that the screen from a projection tv can do the same thing (focusing light, starting fires etc.) do you know if its a fresnel lens also?

[GREENPOWERSCIENCE]

If the TV is pre 1995, it is good, newer tvs are view all angles. So they do not provide a clear lens. They actually are fuzzy and diffused.

[aihlo]

just bought mine, gonna try winter gardening! hahahaaha life is great, thanks Dan

[Akathepriest]

I have a lens, but it is from projector lens it is only about 5 inches in diameter and about 8 inches in lenght, it is a cylinder with atleast two lenses in it. It can easily produce the same results as this huge lens

[tim2473]

@Akathepriest

No, you can't. The sun provides the energy, not the lens. So a bigger area to collect sunbeams is the most significant way to improve this "experiment". Pretty sure your focus area is smaller, so most likely you will be able to melt small amounts of glass for example. Need a steadier hand though.

[rross27]

TY 4 the cool video:

I wonder if the beam was narrowed down (concentrated) to pencil led size if it would act like a lazer and cut through glass quickly and more accurately? Or maybe you could even do glass blowing? It's fun to experiment!

[carzfan96]

i need to get me one of those things >=D

[antichatboot0]

fire ants beware

[shamwowwow]

Dan, I have two fresnels lenses, both one square foot each. Can you "stack" them and double the power? Like with a space between them?

[GREENPOWERSCIENCE]

Stacking them shortens the focal length and because the light must pass through two layers its power is filtered down by whatever percentage of opacity the lenses are. So you get less power.

Dan

[MnemonicShawn]

Cool vid. It's amazing to think about how much energy can be found within only 2 X 3 ft of surface area.

I remember when I was a kid playing with my grandfather's "TV Magnifier" (the exact same as pictured on Wikipedia under "fresnel lens")... ants would just go "pop." If I had known there was a chance I could melt glass with it, I would have been more creative with it! Still have it though, maybe I'll have some fun with it...

[ZenonDorinPower]

you can repair the mum's broken glass haha

[MnemonicShawn]

Heh... that would be an interesting way to repair a windshield crack!

[ZenonDorinPower]

mm...i don't think it will look too good after melting it (no joke,the mum's glass was one of) despite your crack would dissappear

[raysputin]

except for the inside of the car

[fibiger12]

try burning sand with it to see if u can make glass :)

[ouzo1power]

Where can you get a FRESNEL LENS from? I checked ebay today but they only seem to have small ones. Thanks, Nicos

[GREENPOWERSCIENCE]

Go to our website greenpowerscience

[ouzo1power]

Thank you Rojas, Nicos

[InSaneTK]

Imagine a fresnel lens that is maybe.. 8 times as large in a huge installation. I wonder how much power you can generate through that heat. It's melting glass, I think the beam got around 1500 °C (2700 °F) to 2300 °C (4200 °F), in order to melt it.

Imagine a more refined fresnel lens with more accuracy etc.

[joelito101]

I could come up with some cool stuff with a couple of these.

[Matt12341234]

It really gives insight into what the sun is capable of.

[tommytowne]

I just purchased a 8½ x 11 fresnel lens!! Do you think I will be able to boil a pot of water if I reflect it to the bottom of the pot with a mirror.

[GREENPOWERSCIENCE]

You can boil 1oz with that size of a lens but not much more. You can heat 8oz.

[MrShanester]

Do people just have a giant fresnel lens at home to melt grass and burn stuff with?

I got to get one just to have.

Oh and cool video!!

[olengivens]

beware ants !!!!!!

[automatt12]

the melting point of glass is 4200 F.

[Raycheetah]

The surface temperature of the sun is 9,800 ºF. That means that this video demonstrates collection and concentration of solar energy which has traveled 96 million miles to about 43% of its source intensity.

Amazing. =^[.]^=

[tainterlakeisgreen]

Not be a smart ass but glass does not have a true melting point because it is amorphous. It has a "glass transition temperature."

This means that as you increase the temperature it slowly (or quickly) becomes more and more liquid.

This is why some people say glass is a supercooled liquid. Highly debatable topic. I suggest you look it up, its an interesting read.

[trunk516]

Well.........8 minutes of a guy basically burning up stuff with a fancy magnifying glass.I assume there are other benefits to me purchasing a Fresnel lens other than being able to make crude drawings on wood? Because if there are I believe I missed the narration that told how. ( sarcasm alert ) Sheeeesh

[GBH2o4u]

Did you combine the parabolic mirror and fresnel lens is that how you could melt glass?

[GREENPOWERSCIENCE]

Just a Fresnel Lens does the job. The glass needs to be dark to melt. Clear glass can be worked into melted dark glass.

[GBH2o4u]

Thanks really Hot!, I think I had a dream last night that you could make a radical lasor from the huge Fresnel lens off of the hudge parabolic mirror + a special lens that focuses that light into a narrow beam, might be able to cut threw anything? Is that wierd?or maybe just a high temp glass lens thats concaved on both outside edges? The plastic fresnel lens might melt?thoughts on this? You have a great green idea the parabolic mirror and the boiler for a steam turbine to make electricty!

[lani0]

I wanted a spot lens : 34x44 looks good too :D

[lani0]

I went and bought two lenses,but they're only a foot a side and they heat water with quite some reluctance. do you know suppliers in India ?

[GREENPOWERSCIENCE]

Go to our website, what size are you looking for.

[lani0]

:D the big one that melts copper :D

[lani0]

you seem to be answering all possible questions diligently. Thank you !!

For fresnel technology to become household terms, we need

1. network /knowledge of suppliers

2. cheap solar trackers

[AmigaFalcon]

wouldn't these be useful for focussing energy on solar panels?

[GREENPOWERSCIENCE]

Hi,

Here is a video:-)

watch?v=-yh1q59a1h0

[Yourdeadmeat69]

How do I organize the fresnel lens, the parabolic mirror, etc into an alternate heat source for my house?

I need more follow the dots instruction

[coldsteel2005]

Can I make a grilled cheese sandwhich with a Fresnel lens?

[GREENPOWERSCIENCE]

GREAT IDEA:-)

[Goatherder1m]

I hope to see that beautiful girl making glass art in one of the next videos :)

[bereaman]

Suprised its not been made into a weapon yet-hot countrys-war-uuummmm.

[reenlistblues]

Bigfoot uses a fresnel lens to look at normal sized humans?

[GREENPOWERSCIENCE]

LOL:-)

[AHIMSAAHIMSA]

Is it true that these lenses are to be found on the front of those large screen TV's?

[windiebong]

he dont say much

[Starfleet0]

where do i get a 6 X 4' fresnel lens? (or even bigger?! *starts having very wild thawts*)

i want to get something that will exterminate anything in its path.

please help, it seems ur the only one who might just be able to help me, iv been asking around everywhere!!! argh!! but everyones like "what?!... what's fresnel?? i have a magnifying glass.. is that what u want?"

[Starfleet0]

cont'd

....

i cant even find the bloody things on the internet!!!! i search 'big lens' into anything and it comes up with freakin telephoto lenses and camera stuff!!!!! aaaarrgghhh!!!!!

[fusionfreq]

maybe a higher force doesn't want you to exterminate? :)

[aeroscope]

where do you buy those focusing mirrors or glass?

[nathanxr]

That's excellent... did you get that lens from Edmund equipment or whatever they're called?

[GREENPOWERSCIENCE]

Thank you for the comment. These lenses came from various places. I got a bunch from a speciality company a while back and have been selling some extras on E bay my web site has a link towards the bottom of the home page.

[roscom1tm]

amazing

[solar80]

What is the temperature in focus?

In C, please. :)

[GREENPOWERSCIENCE]

ABOUT 1650C on the strongest lens. This drops if focused on metal objects to around 1250C

[HomesliceDrummer]

Is there a way to place magnifying glasses in series as to magnify to sun even more to get a hotter beam?

[GREENPOWERSCIENCE]

Yes, but you would need a large one about 6 inches as anything smaller would get very hot.

[HomesliceDrummer]

Right. I've been curious about this. Obvioulsy I wouldn't completely focus the first beam because it would just burn the second lens, but If I could get 2 lenses to focus into a really tight beam that's really hot, that would be badass.

[GREENPOWERSCIENCE]

Yes, but you need mirrors to redirect the light. Simply turn the lens does not bend the light, it stay in a straight line with the sun. I have 3 -40' palm trees I will be adding mirror stands to so I can have 4 lenses focused on one spot. It is very hard to do without controllers to move things as you have 7 axis to monitor.

[IazyGuy11]

Omg at 4:20 (my favorite number *wink*) is that edited i mean cmon is that fking real~?

[GREENPOWERSCIENCE]

?????

[Hopefl1]

Second question. If I get a 50" lens and use a mirror as a deflector to a pan, will I be able to cook with it? Will it damage the pan or how do I keep the pan from getting damaged?

[GREENPOWERSCIENCE]

Hi, The second question. A black cast iron pan works best, cannot damage that unless you try really hard. Place the mirror flat, wear torch goggles, place the beam out of focus on your mirror about 10 inch diameter (saves the mirror) the pan should be 8" roughly above the mirror (tighter beam on pan bottom). Some rear projection TV's have great lenses but MOST have useless lenses. Has to do with viewing optics. Older is better.

[Hopefl1]

Are fresnel lenses on the older rear prtection televisions? I have seen some of your other clips and it looks like the lens with the groves in it.

[Bigjohnnywad]

There has got to be a way to set up an automatic system to rotate with the sun?

[SyndiCossack]

For a particularly skilled welder this would be a wonderful alternative.

[Bigjohnnywad]

So how could this be used to harness the solar heat and be a usuable source for humans?

[GREENPOWERSCIENCE]

Hi, Any heat source that can boil water or heat air can be used as a gas expander which can power pistons or turn flywheel/turbine blades. While it currently will not totally replace fossil fuel usage, it can fill in over 50% of the gaps so long as there is good sun light. When battery storage becomes more advanced, total replacement may be possible. Thank You for the comments.

[Bigjohnnywad]

What type of system could be build to harness heat for a house using the fresnel lense and other items? I am looking for some low cost heat for the house this winter..

[bennny12]

stik youe finger in thare.

[dankfin]

stick ur pecker in there benny- & learn to spell

[Bigjohnnywad]

Benny..who fuking name a kid benny..

[Telecine8mm]

wow!!

[xxsaltybeastxx]

you just love to tinker with science dont cha?

[GREENPOWERSCIENCE]

ALMOST MELTED THE HEAT SIDE. LOL

[JavaLessons]

I see you commenting about transferring to mechanical energy. Did you power a Stirling engine with it ? Or did the engine melt, LOL ?

[Steve0011]

could this high power lense burn with artificial light?

[GREENPOWERSCIENCE]

I have gotten stuff hot with a 1000 watt halogen, but no burn.

[kulpettaja]

It's kinda strange to find out these things... Suddenly we have a huge amount of energy from just a piece of "window". Why aren't these used instead of solar power?

[ARM02]

This just focuses the power. A solar panel the same size as the lens would have the same amount of energy falling on it as goes into the focus.

Besides, this technology exists. A parabollic mirror shines onto a tube of oil, which is used to run a turbine, like water.

[kulpettaja]

Yea, I saw a documentary once about that. Wasn't it a salt tube that the mirrors were aimed at? Nevertheless, there is probably stuff to be invented concerning the use of fresnel lenses!

[GREENPOWERSCIENCE]

A Fresnel lens this size does collect the same sun but solar panels are terrible inefficient. This lens can produce about .7 Kilowatts when transferred to mechanical energy and 2 KW heat equivalent.

[GREENPOWERSCIENCE]

A solar panel this size would do 85 watts or .085 Kilowatts. Parabolic mirrors this size equivalent with a 95% reflectivity would cost $5000 - $10,000 for a quality mirror. Most desert projects sacrifice focal and mirror reflective quality for size and loose about 50% of possible heat. Fresnel lenses are usually made out of acrylic plastic and would not endure more than 3 years of direct sunlight before yellowing. Still a cheaper and better quality solution.

[lilbrudder32]

That is truly awesome. I have a 12" fresnel that I've had for years and years... finally decided to use it in a solar boiler project