Re: electric power generation
From: Saint-Hilaire (saint-hilaire_at_promci.qc.ca)
Date: 06/29/04
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Date: Tue, 29 Jun 2004 10:37:38 GMT
"Conrad Eaton" <conradeaton@hotmail.com> wrote in message
news:3d2b919b.0406270759.1c25ee15@posting.google.com...
> Hi all,
> Some time ago I was involved in a project that used 600 HP electric
> motors. We determined that it was cheaper to generate our own power
> with a deisel mo-gen than to buy power from the local utility (in MA).
> Why isn't the same true for small mo-gens for households? Are small
> engines inherantly less efficient than large engines? That doesn't
> seem true for auto engines. Are there other considerations which
> render household generation impractical?
> TIA
> Conrad Eaton
Yes, small engines are inherantly less efficient than large engines,
this being a wall effect which goes like the square of dimension,
while the volume effect goes like the cube of dimension,
making the wall less significative as the size of engine increases.
This is also true for turbines.
However, engine efficiency also falls rapidely
if you reduces throtle and run a large engine near idle,
and this is even worst of the turbine engine...
Part of the problem is the hourly modulation of demand
which fortunatly cancel out on a large number of connected customers...
Read the problematic of efficient engine at :
http://quasiturbine.promci.qc.ca/QTPhotodetonation.html
Generatiny your own power make sense only if you have
a stable and constant electrical demand like for industrial process,
where the engine heat can further be used...
Bonne journée, Gilles
www.quasiturbine.com
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