Correct, but incomplete, answer (have renumbered answers) is 4
But complete answer is:
A,B and D produce more radiation heat
C less radiation
E most heats buy convection
Therefore, if you are sitting exposed to sources A, B and D, you feel
warmer with the same power (sounds strange ?) as of C or E.
If you are interested ONLY in heating a room, answer 1) is ok.
But if you are interested in heating people (for example, outdoor),
sources A, B and D are very efficient options.
Let us put it this way: A,B and D are most efficient in delivering the
same amount of power of C and E, but where you need it more: on your body.
Example: a keep 64 F at home. When I am walking around it is a
comfortable temperature. But when I sit down, I start to feel a little cold.
Solution: a 150W halogen lamp with reflector pointed in my direction.
150W is not that much power, but you have to compare it to your body
heating power (about 100-200W), so if you could deliver that power to
heat yourself and not the walls of your house ... :-)
Actually, the illumination is, indeed, free. 500 watts of energy
consumed results in 500 watts of heat, regardless of what else the
energy is doing. If you have a refrigerator that consumes 500 watts
of electricity and it runs continuously, it's producing exactly the
same amount of heat as five 100 watt light bulbs. And it chills your
beer for free. In fact, if you heat your home with electricity, it
doesn't cost a dime to run all your appliances and keep all your
lights on all day and all night long (assuming, of course, that you
do it during the heating season and you're not overheating your
It doesn't cost more in all areas of the world.
In FACT, a natural gas fired, forced air furnace cost more to run than
straight electric heat last year.
Now just think of the savings they could have had with a heat pump!
True. I'm speaking in conventional terms in the US. Obviously,
Depends on where you live in the country. While my figgerin' could
be wrong, at around $0.08/kwh, (Chicago area), I calculated that
natural gas would need to be in the ballpark of $2 per therm in order
for electricity to be competitive.
Not every power supplier burns natural gas for it's source. Our electric
rates are much cheaper since they burn coal in this area.
I'm also not saying that electric is ALWAYS cheaper all over the US or
saying that it stays that way. (we were talking about 8 cents/kw vers high
priced natural and using a heat pump to save money)
Last year our natural price was over $2.50 per therm while electric was
under .08 cents/kw. Now put that in your pipe and smoke it! :-)
Where is electricity .24/kw?
The utility where I live burns minimal gas just enough so they can base
their production cost on it.
For example - using nuclear it cost 1 unit to produce one mw of electricity,
two units of coal to produce one mw of electricity and ng cost 8 units to
produce one mw of electricity. They list their cost as 8 units to create
one mw of electricity and it's perfectly legal under the recently enacted
rules re: deregulation. BGE works something like this
50% of the electricity is produced using nuclear, 40% using coal and maybe
5% other and 5% using ng. They legally state their cost is 8 units per mw
Can you spell rip-off. There will never be anything resembling a legitimate
completive market for electricity. Why?
it can't be stored,there's no real competition, the local electric power
grid weren't designed to ship electricity long distances, due line
resistance there's a greater power loss the further electric is shipped and
it stresses the power grids which were designed for local consumption.
Deregulated electric rates will never save consumers money over sanely
regulated rates. The next big rip of coming will be in "delivery charges"
already in some areas "delivery charges" and "customer charges" are
approaching the over priced cost of deregulated electricity.
I don't know what it's like today, but, as I recall, customers of
some of the municipal power companies in New York that were buying
hydro power from PASNY were paying something like $0.004/kwh (yes,
that's less than 1/2 cent) as recently as 1999. Needless to say,
these were all electric homes.
When I was a kid, in the Pacific Northwest, electricity was $.02/KwH.
My Father, the Banker, was a Depression KId, and had a fetish about
turning off the lights, in rooms that were unoccupied. He would
get very angry at us kids for "Wasting Electricity". In 7th Grade,
I wrote a Paper for Science Class on the efficency of an "All Electric
House" which we lived in. Got an "A" on the Paper, and after my Father
read it, he quit ragging on us kids about the lights, but only durning
the winters. Summers were still a bit of a hassel........
Bruce in alaska
Not sure that is 100% true. There is lots of waste heat, but the
refrigeration system is expending energy pumping heat out of the refrigerated
area, just so it can gradually be absorbed back from your heated home. At the
end of the day, does all of the energy that the refrigerator uses really show up
as waste heat in the room?
My head hurts.
> > If you have a refrigerator that consumes 500 watts
> > of electricity and it runs continuously, it's
> > producing exactly the same amount of heat as five
> > 100 watt light bulbs.
> Not sure that is 100% true. There is lots of waste
> heat, but the refrigeration system is expending
> energy pumping heat out of the refrigerated area,
> just so it can gradually be absorbed back from your
> heated home. At the end of the day, does all of the
> energy that the refrigerator uses really show up
> as waste heat in the room?
Of course it does. If the refrigerator is consuming
an average of 500W it delivers an average of 500W.
That's just basic physics.
There is a "cool" exception, but this was not included
in the original question.
During the heating season take liquid tap water in a
container, freeze it in the freezer, and throw the
resultant ice out doors.
In addition to the power needed to run the
refrigerator you will have extracted some of the heat
in the water.
> My head hurts.
Home of the $35 Solar Tracker Receiver
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