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An end to the fuel crisis?

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daemonoid
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PostPosted: 13:17 - 22 Oct 2012    Post subject: An end to the fuel crisis? Reply with quote

Maybe we won't need electric bikes after all:

https://www.newscientist.com/article/dn22407-the-big-question-mark-over-gasoline-from-air.html

It's not a new idea, but it's good to know trials are being done. With a bit of investment and time we'll soon be sucking polluting out of the countryside and dumping it in the cities Wink
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Rogerborg
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PostPosted: 14:46 - 22 Oct 2012    Post subject: Reply with quote

This again? CO2 + H2O + energy... oops.

With cheap, plentiful energy, pretty much anything is possible. Where does our energy come from? Let's ask the Department of Energy and (Jesus wept) "Climate Change":

Coal: 293,444
Gas: 275,591
Nuclear: 181,732
"Renewables": 14,696
Wind: 12,675
Hydro: 7,500
Oil: 4,023

Figures are for 2011 in GWh. I make that 72.6% coming from fossil fuels, 23% from nuclear, with all ecomental scams taken together managing just a token 4.4%, and that's including "renewables" i.e. burning random junk.

So, burning hydrocarbons to make electricity to make hydrocarbons. Well, derp.
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daemonoid
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PostPosted: 15:30 - 22 Oct 2012    Post subject: Reply with quote

No no no, you've missed the point - these could have solar panels on top to produce half a litre of fuel per day!

Like the article said, it's not a new thing, but the stage 2 trial will be interesting.

If nothing else, it means us enthusiasts will be able to continue with our ICEs long after everyone else has switched to electric.
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Rogerborg
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PostPosted: 16:00 - 22 Oct 2012    Post subject: Reply with quote

daemonoid wrote:
No no no, you've missed the point

I really haven't.

If you can convince me that real world solar (or wind, or tidal) can generate enough energy to cover their extraction, refining, manufacturing, installation and maintenance, including producing enough extra energy to sustain the humans who play a fairly important part in that process, then we can talk.

I have this vision of the remaining tribe of filthy, faux-fur clad humans huddled around a broken solar panel in a damp, freezing cave, grunting "Me no understand! Is green technology, would be ethical for it to make net energy!"

Then Charlton Heston shotguns them all to the face. END.

OK, I grant that if "renewables" can actually produce energy beyond that required to sustain them (and us) then it makes far more sense to stored that energy on site than to pump it into the grid. However, the "if" step there can't be skipped.
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daemonoid
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PostPosted: 16:07 - 22 Oct 2012    Post subject: Reply with quote

Rogerborg wrote:
daemonoid wrote:
No no no, you've missed the point

I really haven't.


Yes you have... Perhaps my irony was too subtle for you...

Quote:
half a litre of fuel per day


And the little Wink at the end of the first post.
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TheSmiler
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PostPosted: 19:40 - 22 Oct 2012    Post subject: Reply with quote

daemonoid wrote:
No no no, you've missed the point - these could have solar panels on top to produce half a litre of fuel per day!


Or they could move it to somewhere constantly or mostly in the heat like africa and create it faster, improving their economy and improving the world.
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Spudly
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PostPosted: 20:32 - 22 Oct 2012    Post subject: Reply with quote

daemonoid wrote:

Yes you have... Perhaps my irony was too subtle for you...

Quote:
half a litre of fuel per day


And the little Wink at the end of the first post.


But surely....every little bit helps, doesn't it?

In one of the comments on that article, someone mentioned the idea of taking advantage of otherwise wasted energy to power something like that.

To me, that's the killer application of the next 20 years. Not so much making petrol from air, but energy scavenging. Locating places where energy is being wasted, then figuring out how to reclaim it and put it to use..

It needn't be done on an individually significant manner either. For example, this is a still experimental technique for generating electricity using the principles of piezoelectric transduction.

Granted, they say that at the time of writing, the electricity generated couldn't power a lightbulb, but they didn't mention storage. When you think about it, the average lightbulb doesn't get used all that much.

Change it out to a comfortable coloured LED and use a rechargeable battery of some form and Bob's the bloke who married your auntie.

Get 10% of lightbulbs changed over, that represents a significant saving.

Sounds all pixies and fairy dust, but I sincerely believe these things and other techniques like it really need to happen.
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Vracktal
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PostPosted: 00:06 - 23 Oct 2012    Post subject: Reply with quote

Heh, oh, look, it's this idea again.

Producing gasoline from air is an idea which has been suggested in various forms already, each time the same problem crops up; The laws of thermodynamics prevent it from producing more energy than you input in the first place, which means that any system based on our existing electrical supply infrastructure is an exercise in concept only.

To become truly viable it would need to be coupled with some form of high-capacity, renewable energy, either wind, solar, or as a best case scenario, perfected fusion technology (which is still some way off if it's even possible, and if it is then there are way more simple and feasible ways to synthesise hydrocarbons from our atmosphere using electricity which have already been suggested and proven to work, like the CR5 heat engine.)

So basically, we can't create a viable fuel synthesis model until we create a large-scale, viable renewable energy supply.
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Knightsy
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PostPosted: 08:06 - 23 Oct 2012    Post subject: Reply with quote

Won't happen as long as oil companies are around Wink
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LordShaftesbu...
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PostPosted: 09:10 - 23 Oct 2012    Post subject: Reply with quote

It's only been mooted as a way to store wind/wave/tide energy when production outstrips demand. So of negligible importance in the grand scheme of things.
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jjdugen
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PostPosted: 09:31 - 23 Oct 2012    Post subject: Reply with quote

I get the, you can't get more energy out than you put in idea, the reason, I was taught, that you can never have a feasable perpetual motion machine. So I accepted the lore and looked instead at ways of increasing efficiency.

Then it occured to me that there is one 'machine' that produces considerably more energy than is put in. Not qute a feasable energy source, but proof that excess energy CAN be produced. A nuclear bomb is not something you can put in your tank, I admitt, but it does give the lie to the wisdom that no machine can create more energy out than goes in.
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LordShaftesbu...
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PostPosted: 09:36 - 23 Oct 2012    Post subject: Reply with quote

A nuclear bomb does not put out more energy than goes in, when you remember that matter is energy.

If only they could invent a machine that uses nuclear energy as a power source!

https://kidzcoolzone.com/wp-content/uploads/2011/03/nuclear-power-plant.jpg
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Rogerborg
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PostPosted: 09:50 - 23 Oct 2012    Post subject: Reply with quote

daemonoid wrote:
Yes you have [missed my point]... Perhaps my irony was too subtle for you...

I couldn't see it from all the way up here on my horse. Razz

Need to get InB4 the ecomentals start taking it seriously. Wink
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weasley
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PostPosted: 10:02 - 23 Oct 2012    Post subject: Reply with quote

It's ok, because crude oil is not made of old fossils anyway, it's made of rocks.
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jjdugen
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PostPosted: 12:16 - 23 Oct 2012    Post subject: Reply with quote

Matter is energy, agreed, everything has 'energy' at the atomic level, its releasing that energy economically that is the rub.
A nuclear bomb does have the overhead of producing fissionable matirial, but as this requires a reactor that itself produces energy, the energy cost of producing fissionable matirial is offset to a very large extent.
It is the one argument I have made that seems to shut up even pretty learned proffessors. I know I have hit a sore spot when they start becoming dismissive and generally finish the conversation abruptly.
That is a 'machine' that we can produce here on Earth, the sun has been doing a pretty good job of being an almost endless, renewable energy source almost since time began.
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daemonoid
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PostPosted: 13:43 - 23 Oct 2012    Post subject: Reply with quote

jjdugen wrote:
Matter is energy, agreed, everything has 'energy' at the atomic level, its releasing that energy economically that is the rub.
A nuclear bomb does have the overhead of producing fissionable matirial, but as this requires a reactor that itself produces energy, the energy cost of producing fissionable matirial is offset to a very large extent.
It is the one argument I have made that seems to shut up even pretty learned proffessors. I know I have hit a sore spot when they start becoming dismissive and generally finish the conversation abruptly.
That is a 'machine' that we can produce here on Earth, the sun has been doing a pretty good job of being an almost endless, renewable energy source almost since time began.


I don't think it shuts them up because you've proved them wrong, I think it makes them realise they're wasting their time trying to have a discussion with you.

Fortunately I'm not a professor...
None of what you've described produce more energy than is put in. They simply convert fuel (hydrogen) into big boom - that's the sun and H bombs. What you're saying is the equivalent of saying a bike engine is a perpetual motion machine because 'it doesn't take energy in, it only takes petrol'.
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LordShaftesbu...
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PostPosted: 14:23 - 23 Oct 2012    Post subject: Reply with quote

jjdugen wrote:
Matter is energy, agreed, everything has 'energy' at the atomic level, its releasing that energy economically that is the rub.
A nuclear bomb does have the overhead of producing fissionable matirial, but as this requires a reactor that itself produces energy, the energy cost of producing fissionable matirial is offset to a very large extent.
It is the one argument I have made that seems to shut up even pretty learned proffessors. I know I have hit a sore spot when they start becoming dismissive and generally finish the conversation abruptly.

But what is your argument, exactly? What is the nature of this 'sore spot' you believe you've identified?

A lot of what you've written so far is factually incorrect. You don't need a nuclear reactor to produce fissionable material (not that that seems relevant to me anyway), atomic bombs do not produce more energy than goes in, and we already have the means to harness nuclear reactions to produce electricity.

I think daemonoid's right - most professors have better things to do than to personally educate you on the basics. Try reading.
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Rogerborg
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PostPosted: 15:01 - 23 Oct 2012    Post subject: Reply with quote

https://cdn.memegenerator.net/instances/400x/28847464.jpg

Throw the Heisenberg limit at some beard stroker spouting Zeno's dichotomy, now that's a laugh.
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daemonoid
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PostPosted: 16:46 - 23 Oct 2012    Post subject: Reply with quote

Rogerborg wrote:
https://cdn.memegenerator.net/instances/400x/28847464.jpg

Throw the Heisenberg limit at some beard stroker spouting Zeno's dichotomy, now that's a laugh.


Spent the majority of my last meeting trying to figure out what you were on about. Did you mean plank's limit?
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jjdugen
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PostPosted: 17:43 - 23 Oct 2012    Post subject: Reply with quote

OK, I'll plead my ignorance....... Lets see, a few pounds of fisile matirial, a few more pounds of shaped charge semtex, enough energy released to devastate a city the size of Londaon. Seems like a muliplyer to me......
I DO realise that its a fairly specious argument, but it did get me thinking.

Every piece of matter has a resonant frequency. Hit it with a targeted burst and it will shatter, or even explode. The problem with extracting hydrogen from water is that, with present technology, vast amounts of electrical current is required. I have not seen any work on trying to find the resoant frequency of H2O to try actually 'vibrating' the the constituant parts untill the hydrogen element is released.
If an opera singers voice can shatter glass, I am of the mind that high frequencies might be the way forward for hydrogen on demand.
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haroman666
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PostPosted: 17:51 - 23 Oct 2012    Post subject: Re: An end to the fuel crisis? Reply with quote

daemonoid wrote:
Maybe we won't need electric bikes after all:

Rendering my final year project redundant Sad
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LordShaftesbu...
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PostPosted: 18:35 - 23 Oct 2012    Post subject: Reply with quote

jjdugen wrote:
OK, I'll plead my ignorance.......

If only you'd stopped there.
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daemonoid
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PostPosted: 21:56 - 23 Oct 2012    Post subject: Re: An end to the fuel crisis? Reply with quote

haroman666 wrote:
daemonoid wrote:
Maybe we won't need electric bikes after all:

Rendering my final year project redundant Sad


Making a bike? Finished it last year or just starting it? Can I be a test pilot? I'll have a National B class racing license by February!
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haroman666
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PostPosted: 00:14 - 24 Oct 2012    Post subject: Re: An end to the fuel crisis? Reply with quote

daemonoid wrote:
Making a bike? Finished it last year or just starting it? Can I be a test pilot? I'll have a National B class racing license by February!

Just starting it.
"Design the Powertrain for an electric motorbike" is my title. So there's nothing actually being manufactured Sad
And it's only Motor + Running gear.
I'd have happily taken you up on the offer though! However not before i'd tried anything myself Wink
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Shielder
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PostPosted: 12:30 - 24 Oct 2012    Post subject: Reply with quote

jjdugen wrote:
OK, I'll plead my ignorance....... Lets see, a few pounds of fisile matirial, a few more pounds of shaped charge semtex, enough energy released to devastate a city the size of Londaon. Seems like a muliplyer to me......
I DO realise that its a fairly specious argument, but it did get me thinking.

Every piece of matter has a resonant frequency. Hit it with a targeted burst and it will shatter, or even explode. The problem with extracting hydrogen from water is that, with present technology, vast amounts of electrical current is required. I have not seen any work on trying to find the resoant frequency of H2O to try actually 'vibrating' the the constituant parts untill the hydrogen element is released.
If an opera singers voice can shatter glass, I am of the mind that high frequencies might be the way forward for hydrogen on demand.


Okay, I'll bite (and, hopefully, not get too technical)

You seem to have confused two different processes here. In the original post, you were talking about recombining the carbon, oxygen and hydrogen in the air to induce a chemical reaction that produces a hydrocarbon based fuel.

Unfortunately, this is a process that requires energy to be put in in order to recombine the atoms and molecules. It is the energy in the molecular bonds that is released when we burn these hydrocarbons. If you consider that we can only harness 30-40% of the energy in these bonds when we burn them, then you can see that the energy balance is not there.

In a nuclear reactor (fusion or fission) and a nuclear bomb, we are actually converting matter into energy in line with Einstein's famous matter energy equation. Now, the energy released when you convert matter into energy is many many orders of magnitude greater than when you burn something.

In your nuclear bomb analogy, the few pounds of fissile material (U-235 or Pu-239) that you compress (in a highly controlled manner) with the Semtex (actually a few different explosive componds, RDX is used as well as some others) is not all converted into energy. Only a very small percentage is converted, with the rest either not splitting, or becoming fission products (fallout if you will). I think they estimated that Little Boy only converted 0.6-0.8grammes of U-235 into energy.

In a nuclear reactor, the weight of the fuel rods does not measurably change as they convert U235 to energy.

Resonant frequencies (harmonics) are only relevant on the macroscopic scale (big, like you and me). It is really incredibly difficult and energy intensive to create a focussed beam of particles/energy (electrons, neutrons or electromagnetic radiation) that is powerful enough to break the chemical bonds between atoms in a molecule.

Hope that helps.

Andy
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