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Homemade Solar Ray Of Death

Hits: 19691 | Rating: (2.5) | Category: Weird | Added by: manorrd
Page: 1 24 Next >   Jump to: Bottom    Last Post
shizzamX
Female, 18-29, Southern US
 2835 Posts
Tuesday, February 01, 2011 4:42:22 PM
"completely destroyed in a burning shed" wonder if it caused the fire?

Angilion
Male, 40-49, Europe
 11513 Posts
Tuesday, February 01, 2011 4:05:44 PM
Why can't this be applied to power generation?


i) It only works effectively in very sunny areas.
ii) It only produces significant amounts of power with a large area for mirrors.
iii) It's not as dependable for power generation because you can't control how much sunshine there is and how clear the skies are.
iv) It doesn't work at all well at night. You can extend its working time some hours after sunset with clever design, but obviously there's no sun at night.

It is being used and the scale is ramping up as scientists and engineers learn from test facilities, but it's not a panacea for electricity generation.

I notice you're from the USA, so:

I did some rough calculations on a bit of paper a while ago and came up with an estimation that the USA could, on paper, supply its daytime electricity requirements on clear days from covering about half of the Mojave desert with CSP arrays. Of course, it wouldn't be that easy in

Angilion
Male, 40-49, Europe
 11513 Posts
Tuesday, February 01, 2011 3:51:22 PM
koolaidepot: That's the place I was thinking of. The CSP you see in that video is one of the very small ones. The big one outside is far, far more powerful.



K3vin
Male, 18-29, Canada
 487 Posts
Tuesday, February 01, 2011 3:51:22 PM
"With a focal length of about 3 feet, it's totally impractical. I believe the Mythbusters were trying to do it from about a half mile out."

Focal length is a product of antenna diameter... If you didn't notice this is just an elliptical DTH satellite antenna with mirrors on it. You could design your own, much bigger and with a much farther focal length. Not that the whole death ray thing is practical, because it isn't. But it's not impossible if your target stays at the same distance away long enough.

Angilion
Male, 40-49, Europe
 11513 Posts
Tuesday, February 01, 2011 3:42:35 PM
There is a practical purpose for CSP - generating electricity.

The basic idea is the same as a conventional gas/coal/etc power station - you boil water to make steam to drive a turbine that drives a dynamo that creates electricity. The difference is that instead of burning gas/coal/etc to generate the heat, you use a far larger and more precise version of this sort of thing. The CSP heats a large tank of liquid to very high temperature and that heats water to 100C. It works quite well if you have a lot of space for the mirrors and the towers you need to put the tanks in (to raise them up so that all the mirrors can focus on the same area) and a lot of sunshine.

It's not for everywhere, but if you have some hot desert going spare it's useful.

intrigid
Male, 18-29, Canada
 916 Posts
Tuesday, February 01, 2011 3:40:53 PM
It's so bright that all daylight fades away when the camera is centered on the beam. Scary.

koolaidepot
Male, 18-29, Western US
 1 Posts
Tuesday, February 01, 2011 3:40:09 PM
In the same thread and still awesome. http://www.youtube.com/watch?v=z0_nuvPKIi8

Angilion
Male, 40-49, Europe
 11513 Posts
Tuesday, February 01, 2011 3:36:32 PM
His hand being willing to glance into the "light" shows how wimpy this design really is.


It shows the relevance of focus. With concentrated solar power, you get lots of heat (and light) *at the focus*. Move forwards or backwards a bit and it drops hugely. The key point is how large an area the solar energy is spread over. Move away from the point the array is focused on and the area increases rapidly, so the heat decreases rapidly.

splat13
Male, 30-39, Midwest US
 294 Posts
Tuesday, February 01, 2011 3:33:47 PM
With a focal length of about 3 feet, it's totally impractical. I believe the Mythbusters were trying to do it from about a half mile out.

Angilion
Male, 40-49, Europe
 11513 Posts
Tuesday, February 01, 2011 3:32:25 PM
Send this to myth busters . They couldn't get their death ray to work . You did something they couldn't.


Mythbusters were trying to replicate a *specific* myth, in which Archimedes used Greek warriors with polished shields. They tried different materials, but the basis was the same - they were trying to use mirrors held by people. Focus was always the problem there. If you set the same mirrors on a precise alignment to focus on a square inch or two, it would ignite wood *at that precise spot*.

Concentrated solar power is all about focus. You could stand in front of this thing and be fine if you were a yard away from the focus and not looking at the mirror array.

wellsy57
Male, 40-49, Eastern US
 225 Posts
Tuesday, February 01, 2011 3:31:02 PM
His hand being willing to glance into the "light" shows how wimpy this design really is. Quotes such as "bright as 5,000 suns" are only relevent with supporting data. Don't waste your time. Nothing to see here. Buy a magnifying glass, and move on.

Angilion
Male, 40-49, Europe
 11513 Posts
Tuesday, February 01, 2011 3:27:02 PM
5000 suns my arse. Every second, Sol emits about 4,000,000,000,000 times as much energy as a nuclear bomb (in a sense, Sol is a nuclear bomb nearly a million miles wide). Sol is a midrange kind of star. There are suns millions of times more powerful. I suspect his array is more than 5000 times larger than the focus and that's where he's getting the figure from.

There's one in France where the main mirror array is the size of a large building. It'll put a hole the size of your head through anything. It's in the Pyrenees somewhere, because they could put it out of the way and the skies are clear nearly every day.

raikun12
Male, 18-29, Midwest US
 580 Posts
Tuesday, February 01, 2011 3:22:35 PM
destroyed in a burning shed. LOL

Qwertyuiop95
Male, 18-29, Western US
 217 Posts
Tuesday, February 01, 2011 3:21:37 PM
@kilroy5555

It already is, all the time.

VargusMalfoy
Male, 40-49, Midwest US
 13 Posts
Tuesday, February 01, 2011 3:18:30 PM
Send this to myth busters . They couldn't get their death ray to work . You did something they couldn't .

Volsunga
Male, 18-29, Midwest US
 1548 Posts
Tuesday, February 01, 2011 3:15:58 PM
"unfortunately it was destroyed in a burning shed"

I wonder how that happened...

Heureux
Male, 40-49, Western US
 1060 Posts
Tuesday, February 01, 2011 3:13:47 PM
"This kid is a moron."

The fact that you and others have misunderstood what he said doesn't make him the moron.

The quote is 'brightness over 5,000 suns' - which is different from what you and others are imagining he said - the total energy output of 5,000 suns.


Darkhumour
Male, 18-29, Canada
 258 Posts
Tuesday, February 01, 2011 3:04:25 PM
@lillim there is a difference between the brightness scale of the sun and 5000 suns worth of eneryg/heat

kilroy5555
Male, 30-39, Eastern US
 502 Posts
Tuesday, February 01, 2011 3:02:30 PM
Why can't this be applied to power generation?

Fatninja01
Male, 18-29, Australia
 24631 Posts
Tuesday, February 01, 2011 2:56:16 PM
Sounded like somebody needed wd40

sawdusty
Male, 40-49, Canada
 493 Posts
Tuesday, February 01, 2011 2:55:42 PM
That young man has no friends.

ledgehead
Male, 40-49, Canada
 602 Posts
Tuesday, February 01, 2011 2:51:05 PM
send it to mythbusters

xiquiripat
Male, 18-29, Western US
 2419 Posts
Tuesday, February 01, 2011 2:46:42 PM
I'm not sure that he knows what obliterate means.

Lillim
Female, 30-39, Midwest US
 271 Posts
Tuesday, February 01, 2011 2:39:46 PM
Only slightly more powerful than a magnifying glass, it seems. If it were the power of one sun, much less multiple, the metal lid would burst into flame or melt instantly. Impressive use of time, and exaggeration.

TruTenrMan
Male, 30-39, Southern US
 2565 Posts
Tuesday, February 01, 2011 2:26:21 PM
lol @ "OVER 5,000 SUNS"

A single sun would disintegrate all the stuff he was burning in less than a second. This kid is a moron.

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