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Old 10-06-2010, 01:04 PM   #46
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Interesting that you can use the already drilled holes for oil to make a better Geothermal mapping. The only problem with geothermal energy is that it's still depletable. I do not know to what extent. It's certainly a plus that it's green energy, much better than oil and coal.
Well, we could accelerate the depleting of the source with clear conscious, at least until the moment, where the earth is too cold for living before the sun is too hot/near and burns us all. If we are really clever we could balance these two processes and salvage a few more years.
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Old 10-06-2010, 01:12 PM   #47
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The fact that Geothermal energy is considered to be a depletable energy source got me interested. How many years would you expect to get from a power plant and would the fact that you draw heat from the earth give any side effects that we are not aware of.

More info on Geothermal energy can be found at: https://secure.wikimedia.org/wikiped...thermal_energy

It has a depletion section: https://secure.wikimedia.org/wikiped...ergy#Depletion

Doesn't seem like it's a huge problem.

Last edited by thinkpad; 10-06-2010 at 01:35 PM.
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Old 10-06-2010, 02:09 PM   #48
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Well given that the heat is being generated mostly by radioactivity I think it's going to be a long long time.

In fact if I remember what I was reading correctly it will be longer than the time when the sun expands and engulfs the Earth. eeek!
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Old 10-06-2010, 08:49 PM   #49
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I would question the credibility of an article that makes a statement like:

Quote:
Then there's latent heat, Marone says. This type arises from the core's expanding as the Earth cools from the inside out. Just as freezing water turns to ice, that liquid metal is turning solid—and adding volume in the process. "The inner core is becoming larger by about a centimeter every thousand years," Marone says. The heat released by this expansion is seeping into the mantle.
Water expands as it freezes, liquid metal does not, it contracts. In fact water is the only know substance that does.

If Marone can’t get that right, what else did he get wrong? Being a Penn State professor of geosciences, he should know better!
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Old 10-06-2010, 08:52 PM   #50
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I would question the credibility of an article that makes a statement like:



Water expands as it freezes, liquid metal does not, it contracts. In fact water is the only know substance that does.

If Marone can’t get that right, what else did he get wrong? Being a Penn State professor of geosciences, he should know better!
Hmmm....

Still I think there is convection/rotation friction causing heading as the liquid and semi-liquid rock and metal and etc moves around...
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Old 10-06-2010, 08:54 PM   #51
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Not only that, but:

Quote:
the Earth cools from the inside out.
Really?
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Old 10-06-2010, 08:56 PM   #52
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Not only that, but:



Really?
I think what that means (at least to me it meant) that there is trapped head inside that must move outside in order to cool...

Not well stated to be sure.
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Old 10-06-2010, 09:18 PM   #53
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Basic thermodynamics, objects cool from the outside in, not the other way.
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Old 10-06-2010, 09:27 PM   #54
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I understand that, but as I said, it made sense to me in the way I explained. It was just poorly worded/stated I think.

They cool from the outside in, but by the same token the heat moves from the inside out.
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Old 10-06-2010, 09:33 PM   #55
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Even so, if you get one of Marone's classes at Penn State, run like hell!
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Old 10-06-2010, 09:37 PM   #56
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Gotta agree with that!
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Old 10-07-2010, 01:50 AM   #57
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If Marone can’t get that right, what else did he get wrong? Being a Penn State professor of geosciences, he should know better!
There are two parts to the Earth's core-- the solid inner core and the liquid outer core. I think what he was trying to say is that over that timeframe that amount of the liquid outer core material cools enough to solidify and become part of the inner core. (And eventually produce some of these.)
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Old 10-07-2010, 06:55 AM   #58
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Ardeegee, welcome back. I was thinking too about the solid part growing as more of the liquid solidifies. I think (as I said above) Marone just is not conveying what he means very well...
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Old 10-07-2010, 08:05 AM   #59
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Kenny, you should do some research into 26Al/Aluminum-26. You'll see that this (extinct) isotope was what drove the melting of the early small solar system bodies-- and in that order-- first they formed, THEN they melted when they were large enough to hold enough heat in. The first stages of asteroid/comet/planitestimal formation don't actually produce that much heat, as it is an accretion of particles traveling in mostly the same orbit and at mostly the same speed-- if object A is traveling at 50,000 miles per hour and object B is traveling in the same direction at 50,001 miles per hour, when they collide-- not much happens. It isn't the vee that matters, it is the delta vee.

http://www.google.com/search?hl=en&s...AAAKoEBU_QIpth

http://www.google.com/search?hl=en&s...=&oq=&gs_rfai=

http://www.google.com/search?hl=en&s...AAAKoEBU_Q4Rkb
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