[Diy_efi] Veggie van

[Patrick Cahill]

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>I don't think it's that simple.  McDonald's is going to do business and
>make french fries no matter what we do, so there will always be lots of
>used french fry oil, as long as no more than a few people use it to run
>their cars.  But the cycle of growing food, tending it, harvesting it,
>processing the oil out of it to burn in cars is not solar powered, and on
>the scale of use that people use petrodiesel, Biodiesel would not be
>solar generated, nor all the CO2 closed cycle.  That raises the question
>"how much effort does it take to produce a billion barrels of petrodiesel
>vs. biodiesel?"  These little hidden sources of non-renewableness reduce
>the feasibility of so-called "clean" energy sources.

>Whereas I know that if I use solar power to split water, that is closed
>cycle.

The amount of effort needed to produce a billion barrels of biodiesel would
be a bit more efficient to a billion barrels of petro diesel. I say this
using the batch/catalyst method of production for the biodiesel. As I think
I metnioned in an earlier post, there are newer and much more efficient
processes which are now coming out of the experimental phase.

As for hidden non-renewableness in either batch or flow type biodiesel,
there are none.

The closed carbon cycle referred to is in fact, fact. Someone mentioned that
petrodiesel is also a closed cycle, it just takes millions of years. My
point exactly. A lot of the atmospherical damage currently being wrought on
the panet is due to the fact that we are digging up carbon which has sat
underground for millenia and are now throwing it into the atmosphere. We
then expect our current level of vegetation to clean this mess up for us
(ala the Greenfleet idea in Asutralia) and then panic when it doesn't.

The process of growing the food, harvesting the food and processing the oil
is still a better proposition than pumping out an oil well shipping it to a
refinery (ask the Spanish what a great idea this can be) refining and
cracking it through several processes (most taking a huge amount of heat)
and finally shipping it off to market.

I negelected to mention the problems of setting up an oil well to start
with.

Believe me, I am not the type of person you would normally find advocating
"Green" alternatives (Iam a race engineer by day) and I agree that some of
these alternatives can be a backward step. However, the long term
implications of biodiesel and the short term simplicity of implementation
makes it a very attractive alternative to any other current fuel.

Patrick Cahill


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