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(Some Guy)   What could be better than dismantling coal fired power plants? How about converting them to geo-thermal   (renewableenergymagazine.com) divider line
    More: Cool, Fossil fuel, Coal, Geothermal power, Geothermal heating, Natural gas, Power station technology, mother lode of geothermal energy, Coal Plants  
•       •       •

409 clicks; posted to STEM » on 16 Aug 2022 at 4:12 PM (6 weeks ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook



39 Comments     (+0 »)
View Voting Results: Smartest and Funniest
 
2022-08-16 3:41:04 PM  
That's interesting.
 
2022-08-16 3:43:57 PM  
pbs.twimg.comView Full Size
 
2022-08-16 3:48:59 PM  
Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.  

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!
 
2022-08-16 3:50:05 PM  
Crack In The World ≣ 1965 ≣ Trailer
Youtube w-PqtOCcCBY
 
2022-08-16 4:24:12 PM  

patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.  

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!


I don't think the technology is there yet, is it? Sure you can drill some near yellowstone, the american southwest, but I we're not to the point of 'virtually anywhere' yet.
 
2022-08-16 4:30:49 PM  

Communist Middleschool Student: patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.  

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!

I don't think the technology is there yet, is it? Sure you can drill some near yellowstone, the american southwest, but I we're not to the point of 'virtually anywhere' yet.


If the ground temperatures in your area are too low, you can dig an underground cavern and then fill it with burning coal. That will provide plenty of extra geothermal energy.
 
2022-08-16 4:34:20 PM  

patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.  

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!


What is the ballpark depth to drill to get deep enough to access viable heat?  How far down does current technology allow us to go?  They are using geothermal extensively in Iceland, but they don't have to drill too deep with the existing hot springs.
 
2022-08-16 4:45:50 PM  

Hospitaller: patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.  

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!

What is the ballpark depth to drill to get deep enough to access viable heat?  How far down does current technology allow us to go?  They are using geothermal extensively in Iceland, but they don't have to drill too deep with the existing hot springs.



"The oil and gas industry has drilled into sedimentary rock as deep as 26,000 (ft) or 8 km in West Texas, yet more typical oil and gas drilling is 4,000 to 10,000 ft (1.2 to 3 km) depending on the depth to the resource. In areas with geothermal power production, drilling is usually in the 1 to 3 km depth range for western United States. "

https://www.smu.edu/Dedman/Academics/Departments/Earth-Sciences/Research/GeothermalLab/DataMaps/TemperatureMaps

With handy maps for temperature ranges
 
2022-08-16 4:47:14 PM  

Communist Middleschool Student: patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.  

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!

I don't think the technology is there yet, is it? Sure you can drill some near yellowstone, the american southwest, but I we're not to the point of 'virtually anywhere' yet.


There's been some nifty millimeter wave technology demonstrations lately that circumvent the issues of deep drilling with conventional pipe that promise the drill pretty much anywhere thing.
 
2022-08-16 5:05:41 PM  

Communist Middleschool Student: patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.  

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!

I don't think the technology is there yet, is it? Sure you can drill some near yellowstone, the american southwest, but I we're not to the point of 'virtually anywhere' yet.


Five years. Book it. Done.
 
2022-08-16 5:36:57 PM  
Funny thing about geothermal - it requires electricity, what the old closed plants used to make, to run.

Not a positive step.
 
2022-08-16 5:56:33 PM  

zgrizz: Funny thing about geothermal - it requires electricity, what the old closed plants used to make, to run.

Not a positive step.


Fark user imageView Full Size
 
2022-08-16 6:10:35 PM  

zgrizz: Funny thing about geothermal - it requires electricity, what the old closed plants used to make, to run.

Not a positive step.


All power plants use electricity. As long as they produce more than they use it's a win.
 
2022-08-16 6:18:07 PM  

patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.  

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!


Yeah but once you use up all the Earth's heat, we've destroyed the planet. Also, have any studies been done on the cancers it causes?

/Chest tits, libbies.
 
2022-08-16 7:04:49 PM  
 
2022-08-16 7:15:36 PM  

revrendjim: zgrizz: Funny thing about geothermal - it requires electricity, what the old closed plants used to make, to run.

Not a positive step.

All power plants use electricity. As long as they produce more than they use it's a win.


acktwually a closed-loop advanced geo plant can move the heat via thermosiphon.  Hot fluid rises on one side while the cooled fluid falls on the other.  This eliminates the need for a pump and improves output.  Also, it's dirt-simple and resilient.  Without the parasitic load of a pump, we can make profitable use of relatively low heat, around 150°C, available almost anywhere about a mile and a half down.

This article is from last year, but it's still a good read.
 
2022-08-16 7:36:30 PM  
That's really interesting. I live in a geothermally rich area. In fact the building I work in is heated with geothermal, but as far as I know it is only used for direct heating, not electricity production. Seems worth looking into.
 
2022-08-16 7:37:33 PM  

revrendjim: That's really interesting. I live in a geothermally rich area. In fact the building I work in is heated with geothermal, but as far as I know it is only used for direct heating, not electricity production. Seems worth looking into.


That was supposed to be a response to patowen
 
2022-08-16 7:46:13 PM  
If I am able to build my retirement home, it will have a geothermal heat pump for the HVAC.

/got nothin
 
2022-08-16 8:26:50 PM  

revrendjim: revrendjim: That's really interesting. I live in a geothermally rich area. In fact the building I work in is heated with geothermal, but as far as I know it is only used for direct heating, not electricity production. Seems worth looking into.

That was supposed to be a response to patowen


Not used to that.  Even my cat doesn't respond to me.
 
2022-08-16 8:52:56 PM  
Retrofitting of old power plants is a great idea that needs to move ahead quickly. They have been sited, permitted, people have built around them with the expectation of their function. This is why old nuclear COULD be retrofitted with new nuclear or wind or solar along with or instead of decommissioning.  Old coal can be converted to gas or biomass or geothermal. Hydro reservoirs can get added floating solar. Etc.
 
2022-08-16 9:11:51 PM  
Japan used to be a leader in geothermal. It has slipped from the top 3 or so down to number 10 or thereabouts. It used to be a leader in solar too, and in nuclear. Now it is more or less an also-ran. It is not because they are stupid, but probably because they can get resources elsewhere, and cheaply. That will change.

But that is the problem with geothermal, oddly. It makes total sense. We can all think of how easy it is. How it can be so great in the long term. And yet... even the cheap systems get so little interest from people that the technology is scrambling for money.

Compared to everything else, it seems pricey and risky. I made the comment yesterday in a thread that super rich plutocrats, if they do nothing else, should AT LEAST be throwing bones to R and D projects and start ups to develop and demonstrate new technologies. I guess Gates has three or four, Musk has his three or four, Bezos? Google? Not sure Buffett is pulling his weight in this department.

We need a TBoone Pickens to take his drillers and get to work on geothermal in the US West. Too bad we don't have one.

Barring that, we need to raise oil and coal prices. Do it gradually but earnestly. But do it so that geothermal can find a fundamental value to work from, without simple comparison to today's artificially cheap alternatives.

If geothermal can find a basic value or a killer app, it can take off. I think the VOX article that Patowen cites above is a great overview, presenting three or four technologies and 10 flavors. What is exciting is that they show different scales, capital expenditure, etc. There are many geothermal technologies available.

They missed some important applications though.. see below...
 
2022-08-16 9:29:09 PM  
Retrofitting is exciting. The many applications and flavors of geothermal are exciting.

One thing a lot of people miss is that current technologies can be COMBINED with geothermal to give very cheap alternatives to fossil fuels.

You can combine geothermal with solar thermal generation, which is extremely efficient, but which gets expensive when you start dealing with molten salts and the like. You can take very hot water and heat it more using solar heated fluids and heat exchangers to produce supercritical steam, hydrogen, or other chemicals and then on to electricity.

In many systems the geothermal can do the heavy lifting to bring chemical or other processes to a certain point that OTHER systems can then take over push to higher efficiency. There is no reason that geothermal needs to do all the work.

If you take away that requirement for geothermal to meet 100% of some need, then you reduce the initial investment in geothermal considerably. If you need to heat water to 300degCelsius but you don't have 100 million to spend on a project, well, spend 3 million to get a system that will give you 150degCelsius and find the other 150deg someplace else.

I am not convinced, but I do believe, that fitting solar or geothermal "pre-boilers" and improving heat transfer systems and cycles can greatly raise the efficiency of all of the water boiling we are doing with thermal plants today.
 
2022-08-16 9:33:00 PM  

optikeye: [Youtube-video https://www.youtube.com/embed/w-PqtOCcCBY]


This trailer is far and away the funniest thing I have seen all week, and it has been a pretty funny week. Somehow the schlock and the pseudo-science and campy effects all hit me just right.
 
2022-08-16 10:28:38 PM  

Maturin: Communist Middleschool Student: patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.  

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!

I don't think the technology is there yet, is it? Sure you can drill some near yellowstone, the american southwest, but I we're not to the point of 'virtually anywhere' yet.

Five years. Book it. Done.


Cool I look forward to the completion of testing and scaling.
 
2022-08-16 11:47:15 PM  
Here is where the scam is exposed
FTA: "Quaise replaces the conventional drill bits that mechanically break up the rock with millimeter-wave energy (cousins to the microwaves many of us cook with). Those millimeter waves literally melt then vaporize the rock to create ever deeper holes. An inert gas that accompanies the millimeter waves brings the vaporized rock back up to the surface."

imaginary technology is going to make this all possible.  I'm selling bridges round Brooklyn if anyone is interested.
 
2022-08-16 11:55:58 PM  

Obscene_CNN: Here is where the scam is exposed
FTA: "Quaise replaces the conventional drill bits that mechanically break up the rock with millimeter-wave energy (cousins to the microwaves many of us cook with). Those millimeter waves literally melt then vaporize the rock to create ever deeper holes. An inert gas that accompanies the millimeter waves brings the vaporized rock back up to the surface."

imaginary technology is going to make this all possible.  I'm selling bridges round Brooklyn if anyone is interested.


Well, yes, we should all prefer to be scammed by oil companies, like has happened for the past century or more.
 
2022-08-17 12:10:29 AM  

Obscene_CNN: Here is where the scam is exposed
FTA: "Quaise replaces the conventional drill bits that mechanically break up the rock with millimeter-wave energy (cousins to the microwaves many of us cook with). Those millimeter waves literally melt then vaporize the rock to create ever deeper holes. An inert gas that accompanies the millimeter waves brings the vaporized rock back up to the surface."

imaginary technology is going to make this all possible.  I'm selling bridges round Brooklyn if anyone is interested.


Place your bets on whether this technology or fusion power will be the first to deliver on their promises.
 
2022-08-17 12:14:15 AM  

patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.  

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!


Ummm the sun is about 15 million degrees Celsius. That is why fusion of hydrogen happens.  This is way hotter than the core of the earth which is about 6000 degrees Celsius.

Also just because you can drill deep doesn't mean it is economical to do so. Furthermore the deeper you drill the well the less efficient the power plant becomes due to the change in height of the steam. That change changes the potential energy of the steam at the expense of the energy available to the turbine.


Take the Steam generation equation:
Q - WS = m2[V22/2 + gz2 + u2 + P2Ï...2] - m1[V12/2 + gz1 + u1 + P1Ï...1] + dEC.V./dt

Q = Heat input per unit time
W
S = Shaft work such as that done by a turbine per unit time
m
2 = Mass flow out of the system per unit time
m
1 = Mass flow into the system per unit time
(V
22 - V
12)/2 = Change in kinetic energy
gz
2 + gz1 = Change in potential energy
u
2 = Internal energy of the exiting fluid
u
1 = Internal energy of the entering fluid
P
2Ï...
2 = Flow work of fluid as it exits the system (P = pressure, Ï... = specific volume)
P
1Ï...
1 = Flow work of fluid as it enters the system
dE
C.V./dt = Change in energy within the system per unit time

https://www.power-eng.com/coal/steam-generation-thermodynamics-101/#gref
 
2022-08-17 12:16:14 AM  

Obscene_CNN: patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.  

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!


Ummm the sun is about 15 million degrees Celsius. That is why fusion of hydrogen happens.  This is way hotter than the core of the earth which is about 6000 degrees Celsius.


And what's the temperature of the surface of the sun?
 
2022-08-17 12:17:20 AM  

Ivo Shandor: Obscene_CNN: Here is where the scam is exposed
FTA: "Quaise replaces the conventional drill bits that mechanically break up the rock with millimeter-wave energy (cousins to the microwaves many of us cook with). Those millimeter waves literally melt then vaporize the rock to create ever deeper holes. An inert gas that accompanies the millimeter waves brings the vaporized rock back up to the surface."

imaginary technology is going to make this all possible.  I'm selling bridges round Brooklyn if anyone is interested.

Place your bets on whether this technology or fusion power will be the first to deliver on their promises.


Try micro waving a rock until its vapor. Fusion is the safe bet here.
 
2022-08-17 12:18:18 AM  
It's in the ballpark of about 5000 degrees C, btw.-
 
2022-08-17 12:24:04 AM  

iron de havilland: Obscene_CNN: patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.  

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!


Ummm the sun is about 15 million degrees Celsius. That is why fusion of hydrogen happens.  This is way hotter than the core of the earth which is about 6000 degrees Celsius.

And what's the temperature of the surface of the sun?


The sun's corona can reach temperatures of around 1.8 million degrees F to 3.6 million degrees F (1 to 2 million degrees C)
 
2022-08-17 12:32:07 AM  

Obscene_CNN: iron de havilland: Obscene_CNN: patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!


Ummm the sun is about 15 million degrees Celsius. That is why fusion of hydrogen happens.  This is way hotter than the core of the earth which is about 6000 degrees Celsius.

And what's the temperature of the surface of the sun?

The sun's corona can reach temperatures of around 1.8 million degrees F to 3.6 million degrees F (1 to 2 million degrees C)


Sorry, but I asked you what the temperature of the surface of the sun was, and NASA says it's about 5.5 thousand degrees C.
 
2022-08-17 12:58:48 AM  

iron de havilland: Obscene_CNN: iron de havilland: Obscene_CNN: patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!


Ummm the sun is about 15 million degrees Celsius. That is why fusion of hydrogen happens.  This is way hotter than the core of the earth which is about 6000 degrees Celsius.

And what's the temperature of the surface of the sun?

The sun's corona can reach temperatures of around 1.8 million degrees F to 3.6 million degrees F (1 to 2 million degrees C)

Sorry, but I asked you what the temperature of the surface of the sun was, and NASA says it's about 5.5 thousand degrees C.


Sorry , From Nasa Sun Surface temp 10,000 degrees F https://www.nasa.gov/sun
Earths core temperature from Nasa 9800 degrees F  https://solarsystem.nasa.gov/planets/earth/in-depth/
 
2022-08-17 1:04:49 AM  

Obscene_CNN: iron de havilland: Obscene_CNN: iron de havilland: Obscene_CNN: patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!


Ummm the sun is about 15 million degrees Celsius. That is why fusion of hydrogen happens.  This is way hotter than the core of the earth which is about 6000 degrees Celsius.

And what's the temperature of the surface of the sun?

The sun's corona can reach temperatures of around 1.8 million degrees F to 3.6 million degrees F (1 to 2 million degrees C)

Sorry, but I asked you what the temperature of the surface of the sun was, and NASA says it's about 5.5 thousand degrees C.

Sorry , From Nasa Sun Surface temp 10,000 degrees F https://www.nasa.gov/sun
Earths core temperature from Nasa 9800 degrees F  https://solarsystem.nasa.gov/planets/earth/in-depth/


Close enough, considering that there are no direct measurements of the Earth's core temperature.
 
2022-08-17 1:25:49 AM  

Ivo Shandor: Obscene_CNN: iron de havilland: Obscene_CNN: iron de havilland: Obscene_CNN: patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!


Ummm the sun is about 15 million degrees Celsius. That is why fusion of hydrogen happens.  This is way hotter than the core of the earth which is about 6000 degrees Celsius.

And what's the temperature of the surface of the sun?

The sun's corona can reach temperatures of around 1.8 million degrees F to 3.6 million degrees F (1 to 2 million degrees C)

Sorry, but I asked you what the temperature of the surface of the sun was, and NASA says it's about 5.5 thousand degrees C.

Sorry , From Nasa Sun Surface temp 10,000 degrees F https://www.nasa.gov/sun
Earths core temperature from Nasa 9800 degrees F  https://solarsystem.nasa.gov/planets/earth/in-depth/

Close enough, considering that there are no direct measurements of the Earth's core temperature.


No direct measurements of the surface of the sun either
 
2022-08-17 1:39:26 AM  

Obscene_CNN: Ivo Shandor: Obscene_CNN: iron de havilland: Obscene_CNN: iron de havilland: Obscene_CNN: patowen: Geothermal power is the future.  The public is just barely starting to realize this now.  The core of the earth is hotter than the surface of the sun, and fark-all closer.  Our new drilling skills means we can reach the heat pretty much from anywhere. Carbon-free power 24/7/365, day & night, foul and fair weather and no radiation.

It's not just obsolete coal plants that are the low-hanging fruit here either.  There are lots of spent oil wells that can also be repurposed.  This sector is going to be "discovered" and grow like crazy in the next decade.  Good!


Ummm the sun is about 15 million degrees Celsius. That is why fusion of hydrogen happens.  This is way hotter than the core of the earth which is about 6000 degrees Celsius.

And what's the temperature of the surface of the sun?

The sun's corona can reach temperatures of around 1.8 million degrees F to 3.6 million degrees F (1 to 2 million degrees C)

Sorry, but I asked you what the temperature of the surface of the sun was, and NASA says it's about 5.5 thousand degrees C.

Sorry , From Nasa Sun Surface temp 10,000 degrees F https://www.nasa.gov/sun
Earths core temperature from Nasa 9800 degrees F  https://solarsystem.nasa.gov/planets/earth/in-depth/

Close enough, considering that there are no direct measurements of the Earth's core temperature.

No direct measurements of the surface of the sun either


Not 'direct' in the sense of poking it with a thermometer, but we can measure the emission spectrum and fit a blackbody curve to it (and/or look at stuff like Doppler broadening of spectral lines).
 
2022-08-17 11:53:09 AM  

Obscene_CNN: patowen: Geothermal power is the future.<snip>

Ummm the sun is about 15 million degrees Celsius.

 <snip>

Take the Steam generation equation: <snip>

https://www.power-eng.com/coal/steam-generation-thermodynamics-101/#gref


The surface of the sun is used for comparison.  The earth's core is reeeally hot, and we can use that.  Steam generation doesn't need to happen at the bottom of the well - in a closed-loop thermosiphon plant the heat extraction happens at the surface.

I'm a big geothermal geek and I try not to miss an opportunity to crow about it.  I think it's a no-brainer solution that people are willfully blind to.  I think, like EVs, that it will sell itself eventually.  There are many new installations around the world to watch.
 
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