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If you wold be so kind, please forward any plans for this device yo may have; I have a 41"X 31" Fresnel, and would like to build something like you have.
Chris My e-mail; earnestlksd@hotmail.com
Jun 06, 2011 Rating
Free Fresnel Lens by: BeholdersEye
Hey all, there are people that throw away their old back-projection tvs, I found two tvs on the curb. All you need is a 1/4 in hex drive to undo the screws holding the tv screen or Fresnel lens. Yes, that's why they make this large fresnel lens, plus there are three glass lens, if you want them, in the back. So do not turn down a gifted horse in the mouth, strip and reuse those old back-projection tvs.
May 29, 2011 Rating
Re: Fresnel lens SCAMMERS?!?!!! r by: Bruce
I know several people who don't have easy access to Fresnel lenses who would pay a reasonable price for them.
Can you post a link to your website here?
I have had offers to build similar solar cookers for people, but tell them that they have to provide the Fresnel lens.
I got mine online several years ago, and it was well worth what I paid for it.
Bruce
May 29, 2011 Rating
Fresnel Lens SCAMMERS?!?!!! by: Anonymous
LOL, Ummmm, that's no secret, it's mentioned several times on MANY solar cooking sites. And I, as well as others on these sites sell fresnel lens and don't consider myself or anyone else who sells them "scammers"! You can find lawnmowers on Craigslist, that doesn't make Sears or Home Depot "scammers"! HOWever, thanks for the tip. Also, stop paying for firewood, most of those old tv cabinets are made of wood too...
May 25, 2011 Rating
Stop Fresnel Money Scammers by: Anonymous
Stop paying top dollar for "professional" Fresnel Lenses. How silly. Search Craigslist for "projection TV" or "big screen television" and you can get these things for free. The screen of an old projection TV has a Fresnel Lens in it. Just avoid the HDTV types. Go for the oldest (pre-2000) models. Most people have no idea. Free knowledge. Free energy. Free FRESNEL LENSES!!
Jan 20, 2011 Rating
RE: 2" x 22" copper pipe for boiling water by: Anonymous
I used to use a 2" x 22" copper pipe, exterior painted black, and capped at the bottom, to boil water. With my new setup (not pictured) I use a black 32 oz. stainless steel water bottle.
Sorry, I don't have video, but I have some images here: http://bejoseph.com/solar-photos.
Jan 20, 2011 Rating
2" x 22" copper pipe for boiling water by: santiago
I would like to know more on this device. How it's made and how it works. A video if at all possible. Thanks
Jan 04, 2011 Rating
Another mirror? by: Paul
Oh Oh Ohhhhhhh!, I'm sorry, is that what you meant by using a regular mirror? Yes, by all means you can reflect using a FRESNEL LENS and a regular mirror! I thought you meant cooking with a regular mirror alone, instead of a parabolic mirror...my error.
Jan 03, 2011 Rating
Using a Mirror by: Bruce
Actually, you can use a mirror to reflect the light from the Fresnel lens up to the bottom of the pan. The trick is to not have the mirror at the focal point of the lens.
I have considered using this technique, but because of my cooker's design, I think that it would require more adjustment of the lens and mirror, and complicate the cooking process.
Here is a video demo using a Fresnel lens and a mirror from GreenPowerScience: Fresnel lens
Jan 02, 2011 Rating
Another mirror? by: Anonymous
No, I'm afraid that won't work, sorry. There's no real concentration of rays or heat with a flat mirror. You see, a parabolic mirror (shape) creates a focal point of 500+ degrees, whereas a flat mirror will barely raise the outdoor temperature. I hope this helped answer your question. If you email me, I would be happy to send you a diagram showing you how it works...Thanks,Paul
Dec 30, 2010 Rating
Another mirror? by: Anonymous
Paul
Would it be possible to use another regular mirror to reflect the heat up to the bottom of the frying pan?
Nov 20, 2010 Rating
I have several Fresnel lens for sale... by: Paul
I also sell Fresnel lens if anyone is interested. They make a great solar cooking tool not to mention a ton of fun to play with (an adult that never grew up), although they are to be taken serious and are not a toy! I also have parabolic mirrors and am now working on a larger parabolic cooker that folds up for easy storage and transportation. Great for camping too! Anyway, I can be reached at email for buying Fresnel lens Thanks for reading, Paul
Feb 20, 2010 Rating
Finding Fresnel Lenses by: Bruce
I got the lens from a fellow solar cooker in the mid-west. He sold it to me for $60, including shipping. The lens is 30" x 40" and that seems to be a decent size for solar cooking. I wouldn't go much smaller than that the size of the lens plays a big part in how well it can cook.
There is a company in Florida called GreePowerScience that sells large solar stuff, including Fresnel lenses. You can ofter find their products on E-Bay.
Craig's List is another good place to check for Fresnel lenses.
Feb 19, 2010 Rating
Where did you get that lense? by: Solar cooker in Idaho
Thanks for experimenting with solar cooking. It is a great way to cook and conserve our planet's resources.
I have been looking for a source for a lense like the one in your photo, to experiment with in regards to solar cooking. Do you have information on where you got it and the approximate cost. I have looked at some websites with lenses. Mostly they were too small and I have no idea which type would be most effective for cooking. Any information would be helpful.
Thanks so much.
Nov 24, 2009 Rating
supply fresnel concentrated lens for solar by: frank zhou
Dear Sirs,
We are a manufacturer of china and produce the fresnel concentrated lens.
Now it's glad to have a business relationship with you for these items. if any requestion for
these products, please kindly contact us , we are very interesting cooperation with you on this line.
best ergards
From: Frank Zhou
HangZhou Shili enterprise co.ltd.
HangZhou, China
E-mail: frankhz@msn.com
tel: 0086-571-85450981
