Why Is DC Power Transmission 10X More Efficient Than AC?

The lines themselves are not insulated, but they are suspended on
insulting
bushings, and of course air itself is an insulator.

ďż˝ I've never seen an insulting bushing. ;-)

I was wondering if anyone would catch that...
Click to expand...
Now that you've 'fessed up you need to go to www.newsgroupstypos.com
and get on their 7 step program, just like those rehab clinics in
Arizona that treat sex offenders.

Insulator cost vs conductor cost doesn't change anything but
explicitly stating it is still an interesting [more general] way to
present the problem.

After all, if aluminum was $0.0001/lb you could just lay 3 foot
diameter bar on the ground and run high current/low voltage. I'm
guessing someone has already tried that somewhere.

You could eliminate all those unsightly dangerous crop duster snagging
overheat wires.

WHOOooops! I just made a typo. Now I have to go back on the program.

Or maybe sue for malpractice . . .


Bret Cahill
 
Bret Cahill wrote:

Presumably, 99.2%. �The loss for 92% efficiency
is 8%; reducing that loss by a factor of 10
generates 0.8%.

The 8% figure is an average and an arbitrary one at that.

The only reason the 92% efficiency figure appeared is because electric
power just isn't shipped thousands of miles when it is cheaper to
build plants in every town and ship the fuel instead.

The situation changes if a power plant needs to be in a very remote
location like the Sahara. Â To ship the solar thermal

Solar thermal isn't electricity, it's heat. I assume you mean PV solar.

I think it's a solar trough vapor cycle. Anyway a turbine drives an
alternator in the desert. The voltage is stepped up, rectified,
probably filtered and transmitted to Finland by HVDC where it is
inverted back to ac.

back to N. Europe would waste 1/2 the energy using HVAC.

Why do you think that ? Is there any scientific rationale for it ?

Do the math. If 8% is lost every 200 km using HVAC, then 0.92^8 is
lost going 1600 km.
Click to expand...
Who says 8% every 200 km ?

Graham
 
"Paul E. Schoen" wrote:
"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in message
news:lOGdnfIrON0MjInVnZ2dnUVZ_rjinZ2d@earthlink.com...

"Paul E. Schoen" wrote:

The lines themselves are not insulated, but they are suspended on
insulting
bushings, and of course air itself is an insulator.


I've never seen an insulting bushing. ;-)

I was wondering if anyone would catch that... You win!!!

Actually if an insulator broke off and fell on my head, it would be quite
insulting :)
Click to expand...

More like injuring. 10 pounds of ceramic with a sharp edge falling 60
feet or more could kill you. :(


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"Paul E. Schoen" wrote:
"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in message
news:DK2dneaOBs1sJInVnZ2dnUVZ_vKdnZ2d@earthlink.com...

More like injuring. 10 pounds of ceramic with a sharp edge falling 60
feet or more could kill you. :(

Actually, "insult" is a medical term that means an injury or an incident
that can result in injury:

http://medical.merriam-webster.com/medical/insult

I have heard my brother in law (who is a medical researcher) use the term
to describe things to which people subject their body, that eventually
cause cancer or other disease.
Click to expand...

Some doctors are an insult to your health, as well. I am diabetic,
(along with other problems) and have had a problem with pressure sores
on my lower legs for almost two years. The first doctor blamed me for
them, and the second ignored them. All they cared about was that I took
all the medicene they prescribed. The swellling and sores got so bad
that it lookedlike I was going to lose both legs. One of the things they
kept harping on was that I use absolutely no salt in my diet. A little
over a month ago I decided what the hell. If they were going to start
cutting off body parts, I might as well enjoy my meals for whatever time
I had left. I went back to the level i was using 15 years ago, and
within three days they sores started to heal. In two weeks they went
from 30+ to two. The swelling in my fett wasn't as bad, the migrane
headches stopped. I was very hat intolerant, but I can take about 15
degrees more, without AC. My vision is better, my balance has improved,
I have lost about five pounds, and I am regaining some strength. After
some research, it turns out that almost every medcine I am on lowers
sodium, potassium, or both levels in your blood. My electtrolytes were
all screwed up, and it was slowly killing me.


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Bret Cahill wrote:
Try my < $2/lb diet.

The UC Berkeley _Wellness Letter_ once published a letter claiming
that, if it costs less than 19 cents/lb, it's healthy.

My theory was 19 cents/lb is the cost to load roots from a field onto
a truck + the cost to unload the truck at a market.

In any event, it's affordable.
Click to expand...

It might be affordable, but not right for everyone. Any deviations
in my current diet make me so sick that I can't function.


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Try my < $2/lb diet.

The UC Berkeley _Wellness Letter_ once published a letter claiming
that, if it costs less than 19 cents/lb, it's healthy.

My theory was 19 cents/lb is the cost to load roots from a field onto
a truck + the cost to unload the truck at a market.

In any event, it's affordable.


Bret Cahill
 
On Mon, 28 Apr 2008 10:16:52 -0700, Bret Cahill wrote:

I once found a reference that claimed the body cannot use regular table
salt for its sodium requirement, and that it must first pass through
the vegetable kingdom, and be "chelated".

I thought salt doesn't react with anything in any way but first rate
gourmet cook claims that salt cannot always be added after cooking and
have the same effect.
Click to expand...
Why shouldn't salt react? It dissolves easily in water and provides two
very active ions. There are free (not chelated) sodium and chloride ions
in your body fluids, and your body doesn't care where they came from.
Chemical reactions are sensitive to temperature; things that happen
quickly at cooking temperatures happen more slowly at serving
temperatures, so I would expect salt in the pot to have at least slightly
different effects from salt at the table. The food also spends more time
in the pot or the oven than it does on your plate.
 
I once found a reference that claimed the body cannot use regular table
salt for its sodium requirement, and that it must first pass through the
vegetable kingdom, and be "chelated".
Click to expand...
I thought salt doesn't react with anything in any way but first rate
gourmet cook claims that salt cannot always be added after cooking and
have the same effect.


Bret Cahill
 
"Stephen J. Rush" <sjrush@comcast.net> wrote in message
news:weOdnWEIc52HjYvVnZ2dnUVZ_vSdnZ2d@comcast.com...
On Mon, 28 Apr 2008 10:16:52 -0700, Bret Cahill wrote:

I once found a reference that claimed the body cannot use regular table
salt for its sodium requirement, and that it must first pass through
the vegetable kingdom, and be "chelated".

I thought salt doesn't react with anything in any way but first rate
gourmet cook claims that salt cannot always be added after cooking and
have the same effect.

Why shouldn't salt react? It dissolves easily in water and provides two
very active ions. There are free (not chelated) sodium and chloride ions
in your body fluids, and your body doesn't care where they came from.
Chemical reactions are sensitive to temperature; things that happen
quickly at cooking temperatures happen more slowly at serving
temperatures, so I would expect salt in the pot to have at least slightly
different effects from salt at the table. The food also spends more time
in the pot or the oven than it does on your plate.
Click to expand...
Another point about salt intake is iodine. Common salt bought in stores is
'iodized'. That is, it has a trace of the element iodine added to it.
Using non-iodized salt or no salt at all and you run the risk of having a
deficiency of iodine in your body. This can lead to a goiter (swelling of
the thyroid) as well as other conditions.

Another good source of iodine is seafood, but if you're allergic or don't
eat salt-water fish, you may need iodized salt to prevent such a dificiency.

daestrom
 
tadchem wrote:

Note the various definitions here, used for specific cases.
http://en.wikipedia.org/wiki/Thermodynamic_efficiency
In all cases, the efficiency is the *ratio* of usable energy output to
total energy input. Since energy output cannot exceed input,
efficiency can never be greater than 1.
Click to expand...
With less than two pound feet of torque on my car's throttle, I can get
greater than 100 pound feet at the drive wheel. I get more energy out
of my car than I personally put in.

So I'm right and you ALL are wrong, and now I get to call you all names.

||||||||| The preceding parody was posted to make a point. |||||||||































Grow up. You are all smarter than that.
 
On Thu, 08 May 2008 09:29:34 -0500, OverUnity
<OverUnity@zeropointenergy.com> wrote:

tadchem wrote:

Note the various definitions here, used for specific cases.
http://en.wikipedia.org/wiki/Thermodynamic_efficiency
In all cases, the efficiency is the *ratio* of usable energy output to
total energy input. Since energy output cannot exceed input,
efficiency can never be greater than 1.

With less than two pound feet of torque on my car's throttle, I can get
greater than 100 pound feet at the drive wheel. I get more energy out
of my car than I personally put in.

So I'm right and you ALL are wrong, and now I get to call you all names.

||||||||| The preceding parody was posted to make a point. |||||||||
Click to expand...
Umm, what names did you have in mind?

John
 
Bret Cahill wrote:
So I'm right and you ALL are wrong, and now I get to call you all names.

||||||||| The preceding parody was posted to make a point. |||||||||

Umm, what names did you have in mind?

A sensitive young man such as myself should not be called really bad
names.

Bret Cahill
Click to expand...

If you are that 'sensitive', you shouldn't be online. :(


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your account: http://www.usenettools.net/ISP.htm
 
So I'm right and you ALL are wrong, and now I get to call you all names.

||||||||| The preceding parody was posted to make a point. |||||||||

Umm, what names did you have in mind?
Click to expand...
A sensitive young man such as myself should not be called really bad
names.


Bret Cahill
 
Bret Cahill wrote:
So I'm right and you ALL are wrong, and now I get to call you all names.

||||||||| The preceding parody was posted to make a point. |||||||||

Umm, what names did you have in mind?


A sensitive young man such as myself should not be called really bad
names.


Bret Cahill
Click to expand...
Maybe he wants to call you good names.

Ed
 
John Larkin wrote:
On Thu, 08 May 2008 09:29:34 -0500, OverUnity
OverUnity@zeropointenergy.com> wrote:

tadchem wrote:

Note the various definitions here, used for specific cases.
http://en.wikipedia.org/wiki/Thermodynamic_efficiency
In all cases, the efficiency is the *ratio* of usable energy output to
total energy input. Since energy output cannot exceed input,
efficiency can never be greater than 1.
With less than two pound feet of torque on my car's throttle, I can get
greater than 100 pound feet at the drive wheel. I get more energy out
of my car than I personally put in.

So I'm right and you ALL are wrong, and now I get to call you all names.

||||||||| The preceding parody was posted to make a point. |||||||||



Umm, what names did you have in mind?

John
Click to expand...
Well, in your case, I think John would fit nicely.
:)

Those arguing over how many angels can dance on the head of a pin know
who they are. They need to come to an understanding. I'm curious about
I^2R losses and the impact distributive generation (private solar etc.)
would have on those line losses.
 
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