10-06-2010, 01:04 PM | #46 | |
Wizard
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10-06-2010, 01:12 PM | #47 |
David
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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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10-06-2010, 02:09 PM | #48 |
The Dank Side of the Moon
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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! |
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:
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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10-06-2010, 08:52 PM | #50 | |
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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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10-06-2010, 08:54 PM | #51 | |
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Not only that, but:
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10-06-2010, 08:56 PM | #52 |
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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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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. |
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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10-06-2010, 09:37 PM | #56 |
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Gotta agree with that!
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10-07-2010, 01:50 AM | #57 | |
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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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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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