Re: Biodiesel

[AJH <andrew.heggie@dtn.ntl.com>]

I think Tom meant this for the whole list, it references my message
<lpcuqukfbjfbcdp3hq53r8t6abnaqvfp6i@4ax.com>
On Mon, 21 Oct 2002 00:42:33 -0600, "Tom Reed" <tombreed@attbi.com>
wrote:

>Dear Andrew and Harmon:
>
>Points well taken below, BUT....
>
>Biodiesel is lower in energy on a mass basis, but almost equal on a VOLUME
>basis, and (unfortunately) we measure efficiency on a miles per gallon basis
>rather than the more sensible miles per lb or miles per BTU (or better their
>metric equivalents).  Biodiesel has MORE energy per gallon than gasoline.
>(I just went through these calculations).

I am surprised at this, I had a density for gasoil of 0.86, now
allowing for my scales being +-5grams I have weighed 1litre of
vegetable oil at 920g giving an sg of .92, so yes it does look like
they are similar energy by volume.

I have often wondered at how we by fuel by volume whether liquid or
wood, coal was always sold by weight. Wood fuel is interesting in that
the moisture content varies the weight but not the volume (until you
get below the fiber saturation point), yet is has a marked effect on
calorific value. So in the case of a stack of wood the weight is no
good indication without knowledge of the moisture content.

AJH


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