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La fin du pétrole? LOL vraiment pas pour bientôt...


Malek
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hippies regardez et pleurez!

 

<iframe title="YouTube video player" width="853" height="510" src="http://www.youtube.com/embed/BmkCaXMMShs?hd=1" frameborder="0" allowfullscreen></iframe>

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J'aurais aimé qu'ils parlent des couts du baril... ça c'est aussi important à savoir que la technique elle même.

 

Ca va juste influencer sur quand on pourrait commencer à utiliser cette méthode commercialement, c'est la même chose que les sables bitumineux, beaucoup plus cher à extraire que du pétrole dans le sol, mais du moment que le prix au marché du baril est rendu assez élevé, c'est rentable de l'exploiter. Et ensuite entrent en jeux les économies d'échelles et l'évolution technique qui permet de l'extraire pour moins cher, ou de récupérer une plus grande quantité.

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Le hic c'est le cout et l'effacacite energetique.

 

Evidemment si on peut bruler du petrole pour faire de l'energie + du CO2 et H2O, on peut produire du petrole avec du CO2, H2O et de l'energie. Tout comme une pile electrique.

 

Sauf que l'energie est cher et le point c'est de produire de l'energie, donc ce n'est pas desirable.

 

L'avantage des algues, c'est que l'energie utilise provient de le soleil, qui effectivement "gratuite"...

 

Mais leur appareil vu dans le video, ca semble que ca marche pas sur le soleil...

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ca reste un moyen detourne d'en arrive a exploiter la seule veritable source d'energie disponible sur cette planete, le soleil. et si demain matin des ingenieurs trouvaient un moyen de recolter cette energie d'une facon plus efficace et directe, va t on continuer a se casser le bicycle de cette facon, juste pour le doux vroum vroum du moteur a combustion ?

 

en passant, y a pas plus de merdes qui sort d'un exhaust de char qu'un peu d'eau et du CO2 ....

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ca reste un moyen detourne d'en arrive a exploiter la seule veritable source d'energie disponible sur cette planete, le soleil. et si demain matin des ingenieurs trouvaient un moyen de recolter cette energie d'une facon plus efficace et directe, va t on continuer a se casser le bicycle de cette facon, juste pour le doux vroum vroum du moteur a combustion ?

 

en passant, y a pas plus de merdes qui sort d'un exhaust de char qu'un peu d'eau et du CO2 ....

 

In any combustion process, the most inefficient / incomplete combustion occurs at the beginning and end of the process. Since an internal combustion engine runs thousands of combustion cycles in a minute, this issue exists in a way that is not present with engines that run on a constant combustion process (e.g. jet engine, steam engine). With the advent of emissions regulations for automobiles in the 1960's it was thought the ICE was a sure goner as while it could sort of be massaged to meet initial regulations, the proposals would "surely" kill it. There were all kinds of prototype cars with steam engines and ridiculous garbage like this (I remember one GM prototype of 1969, a Pontiac Grand Prix with a lengthened hood (like 10 feet long), a steam engine of roughly 125 horsepower (instead of 300 horsepower) and it got 1/2 the fuel economy of the ICE engine).

 

But what happened is better understanding of combustion dynamics (combustion chamber design, etc) and superior control of the combustion process (e.g. computer engine controls) basically have turned pollution from ICE into a non-issue. The only big thing now is the NOx emissions on diesels, since the US harmonized emissions standards for diesel and gas engines, but of course to the strictest value... even then, you are pretty much into the realm of diminishing returns (as even the head of the US EPA said circa 2007). Today probably the biggest issue with emissions is cold-start, since all the regulation testing requires start from cold, and a cold engine runs in such a way that is much more polluting, just so that it can function. Something like 1/2 of all the controlled emissions during a trip of maybe 50 km happens in the first 5 minutes of running.

 

ICE is of course thermodynamically limited because it is a heat engine, and like any other, is just trying to "catch" heat as it flows from a hot place to a cold place, and so there must always be heat wasted into the cold place. But, ICE are very very amusing because they make nice noises and vibrations, at least when properly designed.

 

On an aside, I am really interested in the new frontiers of engineering. For a long time, the idea was to replicate or better biological processes, like engines to replace draft animals and the like. Now we are trying to go make our own animal using the power of biological processes. It is really very interesting and promising. Cheaper, tastier, healthier foods, medicines, chemicals, materials and who knows where it will end up.

Edited by Cyrus
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