FRESNEL LENS Flat mirror 250 ft target REDIRECTING SUNLIGHT FOR SOLAR HEATING
by admin on Monday, December 12th, 2011 | 25 Comments
This 12 inch flat mirror can redirect sunlight 250 feet – 500 feet to a Fresnel Lens Receiver that can then concentrate sunlight to a target for solar heating and solar cooking. This shows the incredible power of traditional flat mirrors.
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Could this be used to direct multiple Fresnel lenses onto a single target? Like a crucible with a main lens on it and one or two secondary lenses using mirrors?
@caneywaney Thats what I’m getting at. I wouldn’t pass this along to too many. some could get creativly distructive
@caneywaney watch?v=xDr7uX53Uy8
@GREENPOWERSCIENCE I did do it once though. I used a small fresnel lens (sze of a notebook piece of paper) and collected the sunlight through that. Then placed a mirror at the focal point of the lens, bounced the collected light from the mirror to a piece of wood and it started smoking. So I went from sun, to frensel lens to mirror to wood. On what scale could this be reproduced?
@caneywaney Does not work that way,the focal point expands, lens to mirror just bounces. Your target would need to be 20 inches away.
Now here’s a question. could you do the reverse? in other words, collect the sun in the fresnel lens, directed onto a mirror and redirected to a target? imagine cooking the Talaban with all the sunlight they have over there in Afganistan or Iraq? Sunlight into Fresnel lens onto mirror. easy
Hey I was wondering if this might work to generate heating air . I envision some kind of drum with a vent, then having the lens heat that, and run a hose into the porch of my house in the winter. I would have a small electric far on the hose end on my porch sucking the hot air in. Your thoughts. trying to get cheap heat.
i did this at home my brother held the mirror and i got the lens in front of the mirror but couldentvideo tape it but have one on how to coook go look at my video on youtube
hello
@red7media The sun will be around for another 5 Billion years or something or did you mean when the sunsets? That wont be a problem as it would be very easy to have backup batteries that are also being charged during the day.
Dan, that is somewhat misleading saying ‘optically good mirror’. First of all, I assume that’s a second surface mirror. Saying ‘optically’ generally means it can be used as a secondary flat mirror, such as in a Newtonian. I would be will to bet a few bucks that mirror is no where near being 1/4 wavelength correct.
@Theskidmark61 Thank you:-)
Great educational piece of work!
Only problem is we loose the sun it’s over.
Hey Dan,
Try this, try heating a tin of water using this process…
What mirror? I did not see a mirror?
The trick of tracking the sun with a mirror to keep it aimed is not expensive?
Otherwise this would seem like a great way of redirecting energy.
Cool experiment!
@C24B9 sure no problemo
@343HFD Thanks for posting that. Need more of that sort of peace-keeping in this world. And, yeah, there’s nothing wrong with being a tree-huggin, rock-lickin, dirt-worshippin’ eco-weenie, is there? (And don’t worry…I’ve been called worse than that!)
Peace, Love & Eternal Grooviness
Nice. But not sure how you could use this. The Sun is continually moving in relation to the Earth. You’d need a tracking mechanism on the mirror mount to continually adjust its angle if you wanted to apply this in any useful way for more than a couple of minutes at a time. Tracking mechanisms require power, and electronic sophistication beyond the average DIYer, so the whole thing starts to get much less simple …
Nice. But not sure how you could use this. The Sun is continually moving in relation to the Earth. You’d need a tracking mechanism on the mirror mount to continually adjust its angle if you wanted to apply this is any useful way for more than a couple of minutes at a time. Tracking mechanisms require power, and electronic sophistication beyond the average DIYer, so the whole thing starts to get much less simple …
We should not be surprised that the sunlight is still effective 250ft from a mirror, after all it has just travelled over 90 million miles before it hit the mirror. That said it is still worthwhile looking at this as it shows how even shaded areas can receive sunlight for solar panels etc. Excellent demonstration.
Why not redirect the concentrated light after it hits the Fresnel Lens? So it would act more like a lazer pointer. Burn baby Burn.
can you use optic fibres with a fresnel lense to take heat into the house?
I really like your new closing music. Much better than the old one!