Science > Physics > Re: Water vapour mainly to blame for global warming
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Science > Physics |
| User: |
"habshi@anony habshi" |
| Date: |
11 Dec 2005 05:15:07 PM |
| Object: |
Re: Water vapour mainly to blame for global warming |
How much of the solar energy falling on a small garden during
the day , can one store underground using a heat pump and can this be
say turned into electricity and used say for the fridge and and
washing machines or exported back to the utility company , running the
meter in reverse ?
It could make us energy independent.
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| User: "The Ghost In The Machine" |
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| Title: Re: Water vapour mainly to blame for global warming |
11 Dec 2005 08:00:07 PM |
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In sci.physics, habshi
<habshi@anony>
wrote
on Sun, 11 Dec 2005 23:15:07 GMT
<439cb270.4714629@news.clara.net>:
How much of the solar energy falling on a small garden during
the day , can one store underground using a heat pump and can this be
say turned into electricity and used say for the fridge and and
washing machines or exported back to the utility company , running the
meter in reverse ?
It could make us energy independent.
Define "small garden". The standard insolation is 1000
W/m^2, but there's also the issue of the incoming angle
of that insolation, and also whether the day is sunny
or rainy. Solar cell efficiency, if I'm not mistaken,
is approximately 20-30%. The typical household uses 1 kW
of energy, though that metric is dependent on many things,
for instance how much water is used in the shower and
whether the family cooks or simply eats cold leftover
turkey sandwiches.
As for heatpumps -- there's a few problems with them;
even if one had a good heatpump to warm the house with,
I don't see how the combination of solar-cell and heat-pump
will equate to just letting the sun warm the domicile.
The good news is that most heat-pumps are reversible
in the summer, and most houses have insulation, which
basically reflects the Sun's heat as well as keeping the
heat in.
As for storage -- batteries will do adequately, though
they do have to be recycled/replaced every few years.
There's also the initial setup costs. One problem with
classical solar cells is that they're made of glass (there
are newer variants, however, that should take less energy
to construct). The energy cost of such cells will take
10 years to recoup.
And then there's the issue that, if one plants a roof of
solar cells in one's garden, the garden then is deprived
of sunlight. The plants aren't going to be all that happy,
though one might try a "thatchweave" solution, letting the
solar cells have some of the light in a trelliswork roof
or some such, and the rest of the sunlight filters down.
Of course that further reduces the available electrical
power.
--
#191,
It's still legal to go .sigless.
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| User: "AJW" |
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| Title: Re: Water vapour mainly to blame for global warming |
11 Dec 2005 06:03:14 PM |
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You might want to look up direct conversion (solar cell) effeciency as
well as thermal conversion methods (concentration, boil water, turn a
generator or whatever) to get an idea of just how effective such
schemes might be. The short answer is, there is no free lunch.
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| User: "Bret Cahill" |
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| Title: Re: Water vapour mainly to blame for global warming |
12 Dec 2005 06:16:43 AM |
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< The short answer is, there is no free lunch.
Not only is there no free lunch, even after you pay for one most of it
will get stolen.
Bret Cahill
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| User: "Damon Hill" |
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| Title: Re: Water vapour mainly to blame for global warming |
11 Dec 2005 05:55:29 PM |
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habshi@anony (habshi) wrote in news:439cb270.4714629@news.clara.net:
How much of the solar energy falling on a small garden during
the day , can one store underground using a heat pump and can this be
say turned into electricity and used say for the fridge and and
washing machines or exported back to the utility company , running the
meter in reverse ?
Very little. It's a low grade heat and the efficiency
would be very poor.
It could make us energy independent.
Not a chance.
Typical habshi fantasy.
--Damon
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