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Trane Variable Speed Furnace jwalkky 10-30-2007
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Posted by on November 7, 2007, 3:55 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.
>
>>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.
>
>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.
>
>Centralized generation and AC distribution, using several levels of
>voltage, makes much more sense for supplying homes.

        Damn. You mean, the power companies actually know WTF they're
doing ? Better even than the home-moaners they supply unlimited power
to 24 / 7 ????

        Shit ......



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

Posted by Zyp on November 8, 2007, 4:11 pm
.p.jm@see_my_sig_for_address.com wrote:
> 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.
>>
>>> 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.
>>
>> 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.
>>
>> Centralized generation and AC distribution, using several levels of
>> voltage, makes much more sense for supplying homes.
>
> Damn. You mean, the power companies actually know WTF they're
> doing ? Better even than the home-moaners they supply unlimited power
> to 24 / 7 ????
>
> Shit ......
>
>
>
>>
>> DC is sometimes used to transmit large amount of power long
>> distances.
>>
>> 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/

Where's that popcorn bucket?

--
Zyp



Posted by on November 8, 2007, 4:17 pm

>.p.jm@see_my_sig_for_address.com wrote:
>> 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.
>>>
>>>> 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.
>>>
>>> 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.
>>>
>>> Centralized generation and AC distribution, using several levels of
>>> voltage, makes much more sense for supplying homes.
>>
>> Damn. You mean, the power companies actually know WTF they're
>> doing ? Better even than the home-moaners they supply unlimited power
>> to 24 / 7 ????
>>
>> Shit ......
>>
>>
>>
>>>
>>> DC is sometimes used to transmit large amount of power long
>>> distances.

>Where's that popcorn bucket?

        That was a POPCORN BUCKET ?????

        Damn....... I'm sorry guys. The pocorn is gonna be a little
soggy tonight .... and try to stay away from the big pieces.


--
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/

Posted by geothermaljones on November 7, 2007, 7:39 pm
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



Posted by on November 7, 2007, 9:24 pm
On Wed, 7 Nov 2007 18:39:33 -0600, "geothermaljones"

>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
>

        Actually, one of the main reasons AC won out over DC was that
DC **SUCKS** when it come to distances and transmission. I highly
doubt that it's used ANYWHERE to long distance transmission.

        Google Westinghouse Edison AC DC transmission distance.


--
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/

Page 5 of 6       < 1 2 3 > last >>
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