I think the last constructive post that addressed the topic in this thread was:
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Quote:
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The thing I found most interesting was the level of energy lost. I obviously knew there was waste but I never realised how much... Can they not improve their distribution network? It'd seem like the most win-win thing...
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The amount lost surprised me too, especially considering the role that coal generation plays in electricity supply.
A substantial part of the loss in gas- and steam-turbine power stations (whether the latter are powered by nuclear or coal heat) is limited by the theoretical efficiency limit, which is:
(Ti - To)/Ti
Where
Ti is temperature of the input gas or steam and
To is temperature of the output condensate or gas, both in degrees Kelvin. The lower limit of
To is usually higher than 300 degrees K (~30 degrees C).
But modern generation plants are more efficient than older ones (I recall seeing reports that each time China commissions a new coal-fired plant, it decommissions a smaller, old, far less efficient one.)
More
here.
There are still further opportunities though. Exhaust gas at a little more than 300 degrees K could provide municipal building heating in cold climates.