FRESNEL LENS SOLAR COLLECTION MIRRORS SOLAR POPWER Pyrolysis

http://www.greenpowerscience.com/
ADDITIONAL HEAT FOR AN OVEN

Category:

Howto & Style

Tags:

• FRESNEL
• LENS
• SCIENCE
• SUN
• COLLECTION
• SOLAR
• POWER
• GREENPOWERSCIENCE

[spenatjonas]

What happens if you put another fresnel lens behind the fist one on the focused spot. Dosnt it make a smaller spot than that is more powerfull?

[GREENPOWERSCIENCE]

@spenatjonas It only shortens the focal length but also diffuses the light x 2 so your power drops. EX. 2 great clear lenses. Lens 1 acrylic or glass diffuses 10% leaving 90% light throughput. Lens 2 does the same .9 x.9 =19% drop.

[GREENPOWERSCIENCE]

The lens needs to track too as the angle reduces the power dramatically.

[czechys]

How many hours in the sun before the fresnel lenses go foggy?

[GREENPOWERSCIENCE]

A few years for most acrylics. Some of these were really abused for testing UV

[T4turt1e]

How do you not burn down the building next to the shade?

[GREENPOWERSCIENCE]

The building is 15ft from the focal point. It is also reinforced concrete.

[fibiger12]

use your imagination retard. if you dont think heat can be used for anything usefull, then you should get your school money back

[gr575]

@Ritchard1 The lens would melt

[metartman]

This is super boring and.....yeah. blah

[spenatjonas]

@GREENPOWERSCIENCE Ah. Right. :)

[magicyte]

@gr575 I know hot water tanks on average use about 3000w...but yours I'm guessing is closer to 4500w...so yah...that would mean you'd need at minimum 9 sq meters of solar collective material...with a heliostat to perform the same as your hot water tank.

[magicyte]

@gr575 It's really tough to say...I'm not a math wiz...nor an expert...but I keep getting better with my knowledge of solar rays. Like when people say we get 1000w/sq meter from the sun they're wrong. It's actually 500w once it goes through the atmosphere. Not to mention that's just direct...not counting how low it could be before or after midday. But a heliostat would totally fix that.

[gr575]

@magicyte It's all relative. My hot water collectors are pretty efficient and they are about the size of two sheets of plywood. That's enough for a family of 4 on sunny days. And about 50% in the winter. To heat up a 60 gallon tank of water from 50F to 120F with these large fresnel lenses - well with about 4 of them I guess you could do it in maybe 5 hours. Very rough estimate.

[magicyte]

@gr575 Small amount?...lol...more like a LOT of water...that solar power he has focus is going a helluva lot higher than 400F. Also, it takes around 500F of open flame to burn wood. Without an open flame, wood would burn at roughly 800F. The fact that this wood lights up almost instantly...says that soalr energy has gotta be above 1000F...that's twice the temp of a electric stove burner on high!

[runescapeswordshow]

is the power enogh to liquidfy metal or glass?

[davetista]

if you have the money you should try to get a 20 ft diameter, slightly parabolic mirror and a one ft diameter Fresnel lens.i bet that would ignite the wood instantly. nasa should make a 1000ft perfect one.