[rescue] SGI Challenge L systems available in Denver
nate at portents.com
Fri Sep 17 09:57:00 CDT 2004
On Fri, 17 Sep 2004, Phil Stracchino wrote:
> On Fri, Sep 17, 2004 at 10:39:36AM -0400, velociraptor wrote:
>> In the household, though, a lot of the energy efficiency
>> gains of switching to LEDs (and in using other DC devices)
>> is lost in the inefficiency of the AC-to-DC converters.
> However, I'd think this is a surmountable problem.
First of all, there are new AC->DC mini converters that are a lot more
efficient, but not as common because they cost a bit more (and they cost
a bit more partly because the economy of scale hasn't kicked in to the
degree it has for the older, less-efficient more common design). You see
those most often on recent cell phones.
What's really needed is a large AC->DC converter in the basement and new
DC outlets alongside AC outlets in houses, and devices that work with the
new DC outlets. A large AC->DC converter can be made much more
efficiently than a small one. The net energy savings would be *enormous*
if the US switched to a solution like this. The amount of power lost on a
national scale to low efficiency AC->DC conversion is somewhere on the
order of 30-40% of all power.
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