Re: The Observer: At last: let's put that rail crisis behind us

Roland,

Unfortunately in all six reports, it would appear not. Some are quite
explicit in ignoring these losses, whilst others are not explicit
enough, but produce results sufficintly similar for me to conclude that
they exclude losses as well. So this is energy consumed at the vehicle.

In another thread, comparing energy use by various modes of transport,
the energy losses from a gas fired power station to an IC225 set was
examined by yours truly and was found to be in the region of 82 to 90%
depending upon where the traction substation was fed (at 400kV, 275kV
or 132kV) within the national electricity network. Factor in the energy
conversion within a medium efficincy gas turbine and the whole thermal
energy efficiency became in the order of 44 to 52%, compared to that of
an IC 125 set being about 28% efficient for the same conversion process
(chemical energy to useful work plus losses). The figures quoted here
might not exactly match my earlier article and are as a result of some
updates which I have been working on for the past few months thanks to
actual fuel consumption figures for one fleet of IC125's and the loss
data for CTRL finding their way to me.

The above would need refining for a TGV network on the basis that all
substations will be 275kV or 400kV fed and some better efficiency data
on the latest generation of trains, both TGV-Est (The POS sets) and a
comparison from the ICE 3. I have my European colleagues to thank for
the data that they are providing on this score at the moment.

What we really need for someone to comment on is the efficiency of a
refinery and (pre Buncefield) distribution costs of Diesel to ordinary
filling stations and to large consumers (by lorry and pipeline) and
distribution costs of Jet A1 by lorry and by pipeline.

I am aware that most refeineries are really efficient in that waste
product heat and part fractions of the cat cracking process are used to
provide heat for the processing of the wanted products and to help
offset the site's electricty, process steam and compressed air
requirements. trouble is, I've got no feel for this, whether 70, 80 or
90% would have significant impacts upon the outcome of the models.

Whilst I'm making a plea for help, can anyone give me an energy
conversion process efficiency for an AGR reactor? Even within the
industry and its detractors, there is a wide range of efficiencies
quoted and depending upon which one you pick, it can sway an argument
wildy in or out of favour.

I could plod through the range of scenarios, but as I do this to unwind
at the end of a long day I don't really want to write another thesis in
the process.

Thanks for any info heading my way on the above.

RBC

.

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