Re: Scotland's cycling tax

On 2009-09-16, Mike Clark <mrc7--urc@xxxxxxxxx> wrote:
In message <29b6220e-2b59-4922-b873-06de0ed4c0b8@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Simon Brooke <stillyet@xxxxxxxxxxxxxx> wrote:

[snip]
You cannot efficiently transmit electricity long distances. You can
efficiently transmit smelted aluminium long distances; it becomes, in
effect, embodied energy. So you smelt aluminium where bauxite and
power are plentiful. If the hydroelectric or geothermal energy from
these sources were not used for smelting aluminium (or electrolysing
sea water into hydrogen or some other means of chemically embodying
energy), it could not be efficiently used at all, because these
sources are too far from other consumers for economical transmission.

So the argument is not meaningless; it is simple, basic economics.

According to David MacKay's book HVDC could be used to transmit
electrical power over long distances with acceptable efficiency. He
quotes a 15% loss on a 3500Km line including conversion between AC and
DC at both ends.

see http://tinyurl.com/lt43qs

Or use type 2 superconductors. Superconducting cable in the middle,
jacket of liquid Nitrogen around it, and a bit of insulation on the
outside.
.

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