Trane Variable Speed Furnace

I dunno - when I was in High School, they only covered
linseed-oil lamps and beeswax candles, that was about it.

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Paul ( pjm @ pobox . com ) - remove spaces to email me
'Some days, it's just not worth chewing through the restraints.'
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Posted by =?ISO-8859-15?Q?Tekkie=AE?= on November 7, 2007, 9:29 pm

geothermaljones posted for all of us...

> Now that is something I did not know...

> I do know the AC distribution can eat up 20-30%+ of it's power in order to

> boost it's voltage & keep up the flow,

> but I've never heard of long distance DC distribution.

> Any recommendations on a good read to explain it? I'd like to see how it's

> done...

> geothermaljones

> > DC is sometimes used to transmit large amount of power long distances.

> >

> > Dave

Large data centers are actively investigating DC power supplies directly to the
systems to save on cooling costs and conversion losses by built in power
supplies.
--
Tekkie

Posted by on November 7, 2007, 9:28 pm

On Wed, 7 Nov 2007 20:35:32 +0000 (UTC), davem@cs.ubc.ca (Dave
Martindale) wrote:

>>See, DC is a much more efficient powersource when use in close proximity of

>>production.

>DC *at the voltage you happen to need* is more efficient than AC,

>because there are no transformer losses. But if the voltages don't

>match, it's much more complicated and expensive to change voltage with

>DC.

Bullshit. It takes a resistor.

>>Unfortunately the DC supply to a power grid in an urban area would require

>>huge quantities of copper to transmit.

>>Now if they'd just have used more localized transformers & generation, we'd

>>all be saving energy.

Bullshit. If that was cheaper, they'd have done it ( to save
themselves money ).

>There are probably only a few houses sharing the same pole transformer

>(and thus the same 120/240 V supply). All other distribution is done at

>higher voltage. To get the same efficiency (both electric and copper

>usage) with DC, you'd need a source for every few houses. But

>generators that small aren't very clean or efficient.

Correct.

>Centralized generation and AC distribution, using several levels of

>voltage, makes much more sense for supplying homes.

>DC is sometimes used to transmit large amount of power long distances.

I doubt it. There may be some tiny exception you can scrounge
up, but 99.999 % of long distance transmission is AC.

> Dave

--
Click here every day to feed an animal that needs you today !!!
http://www.theanimalrescuesite.com/

Paul ( pjm @ pobox . com ) - remove spaces to email me
'Some days, it's just not worth chewing through the restraints.'
'With sufficient thrust, pigs fly just fine.'
HVAC/R program for Palm PDA's
Free demo now available online http://pmilligan.net/palm/

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