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Index » Regional/Local » USA/Canada » Solar / Wind / Geothermal / Efficiency Energy Page: 1, 2, 3 ... 37, 38, 39  Next
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ColdMiser

ColdMiser Avatar

Location: On the Trail
Gender: Male


Posted: Nov 22, 2019 - 6:50am



 cc_rider wrote:


 haresfur wrote:


 cc_rider wrote:


 haresfur wrote:
a friend worked for a company that had a very efficient generator for turning heat from a solar tracking mirror into electricity. the cool thing was that it could use any heat source so they could park the mirror at night over a gas flame and continue to generate

the company failed because of cash flow, not because of the technology
 
The idea is pretty simple: use focused solar energy to heat water (or other carrier: I've heard liquid sodium is ideal) to make super-heated steam to power turbines. At night just use a gas burner or excess heat from a cement kiln or whatever.  The big solar arrays I've heard about have a problem with too much heat. They have to de-focus the mirrors to keep from burning up the piping.

A big problem is birds, though. As you get closer to the 'furnace', the solar rays get more focused, i.e. hotter. Apparently it'll vaporize anything that gets too close. Your Thanksgiving turkey is ready in three seconds flat though.
c.

 

Actually, the neat thing was that their system was much simpler. The sunlight was focused onto a linear-drive Stirling engine. Basically a shaft held by bearings that looked like the inserts for 45 records (I assume everyone here are old farts and I don't need to explain what those are). In a nutshell, the heat drives the shaft back and forth through a coil, generating electricity. The parts were simple enough that they thought they could repurpose a closed auto manufacturing plant for production. If I recall, their biggest unit was 3 kW.

I can't remember the conversion efficiency, but it was significantly higher than photovoltaic panels and didn't use fancy silicon. Also solar panel efficiency degrades with time. The tradeoff is having the disk reflector and having to keep it tracking the sun.

They were selling units to the military as generators using diesel as the heat source. More efficient than conventional generators. Not that the price is significant to them, but it turns out driving fuel trucks around a war zone is a dangerous job and the less fuel you move, the safer your troops. As a sideline, they could essentially run the system in reverse as a refrigerator. You can get people to stay hydrated with 30 C water but it's really hard to get them to drink 40 C water.

The boss was trying to set up systems in little villages in Bangladesh. One person power companies that could make a living charging cell phones, etc.
 Sounds really cool. It's a shame it's so hard to get alternative energy projects going. To be fair, they require a big initial investment.
c.


 
Good point, you can lead a horse to water but you can't make him pay for the drink

cc_rider

cc_rider Avatar

Location: Bastrop
Gender: Male


Posted: Nov 21, 2019 - 1:05pm



 haresfur wrote:


 cc_rider wrote:


 haresfur wrote:
a friend worked for a company that had a very efficient generator for turning heat from a solar tracking mirror into electricity. the cool thing was that it could use any heat source so they could park the mirror at night over a gas flame and continue to generate

the company failed because of cash flow, not because of the technology
 
The idea is pretty simple: use focused solar energy to heat water (or other carrier: I've heard liquid sodium is ideal) to make super-heated steam to power turbines. At night just use a gas burner or excess heat from a cement kiln or whatever.  The big solar arrays I've heard about have a problem with too much heat. They have to de-focus the mirrors to keep from burning up the piping.

A big problem is birds, though. As you get closer to the 'furnace', the solar rays get more focused, i.e. hotter. Apparently it'll vaporize anything that gets too close. Your Thanksgiving turkey is ready in three seconds flat though.
c.

 

Actually, the neat thing was that their system was much simpler. The sunlight was focused onto a linear-drive Stirling engine. Basically a shaft held by bearings that looked like the inserts for 45 records (I assume everyone here are old farts and I don't need to explain what those are). In a nutshell, the heat drives the shaft back and forth through a coil, generating electricity. The parts were simple enough that they thought they could repurpose a closed auto manufacturing plant for production. If I recall, their biggest unit was 3 kW.

I can't remember the conversion efficiency, but it was significantly higher than photovoltaic panels and didn't use fancy silicon. Also solar panel efficiency degrades with time. The tradeoff is having the disk reflector and having to keep it tracking the sun.

They were selling units to the military as generators using diesel as the heat source. More efficient than conventional generators. Not that the price is significant to them, but it turns out driving fuel trucks around a war zone is a dangerous job and the less fuel you move, the safer your troops. As a sideline, they could essentially run the system in reverse as a refrigerator. You can get people to stay hydrated with 30 C water but it's really hard to get them to drink 40 C water.

The boss was trying to set up systems in little villages in Bangladesh. One person power companies that could make a living charging cell phones, etc.
 Sounds really cool. It's a shame it's so hard to get alternative energy projects going. To be fair, they require a big initial investment.
c.


haresfur

haresfur Avatar

Location: The Golden Triangle
Gender: Male


Posted: Nov 21, 2019 - 12:49pm



 cc_rider wrote:


 haresfur wrote:
a friend worked for a company that had a very efficient generator for turning heat from a solar tracking mirror into electricity. the cool thing was that it could use any heat source so they could park the mirror at night over a gas flame and continue to generate

the company failed because of cash flow, not because of the technology
 
The idea is pretty simple: use focused solar energy to heat water (or other carrier: I've heard liquid sodium is ideal) to make super-heated steam to power turbines. At night just use a gas burner or excess heat from a cement kiln or whatever.  The big solar arrays I've heard about have a problem with too much heat. They have to de-focus the mirrors to keep from burning up the piping.

A big problem is birds, though. As you get closer to the 'furnace', the solar rays get more focused, i.e. hotter. Apparently it'll vaporize anything that gets too close. Your Thanksgiving turkey is ready in three seconds flat though.
c.

 

Actually, the neat thing was that their system was much simpler. The sunlight was focused onto a linear-drive Stirling engine. Basically a shaft held by bearings that looked like the inserts for 45 records (I assume everyone here are old farts and I don't need to explain what those are). In a nutshell, the heat drives the shaft back and forth through a coil, generating electricity. The parts were simple enough that they thought they could repurpose a closed auto manufacturing plant for production. If I recall, their biggest unit was 3 kW.

I can't remember the conversion efficiency, but it was significantly higher than photovoltaic panels and didn't use fancy silicon. Also solar panel efficiency degrades with time. The tradeoff is having the disk reflector and having to keep it tracking the sun.

They were selling units to the military as generators using diesel as the heat source. More efficient than conventional generators. Not that the price is significant to them, but it turns out driving fuel trucks around a war zone is a dangerous job and the less fuel you move, the safer your troops. As a sideline, they could essentially run the system in reverse as a refrigerator. You can get people to stay hydrated with 30 C water but it's really hard to get them to drink 40 C water.

The boss was trying to set up systems in little villages in Bangladesh. One person power companies that could make a living charging cell phones, etc.
cc_rider

cc_rider Avatar

Location: Bastrop
Gender: Male


Posted: Nov 21, 2019 - 9:02am



 haresfur wrote:
a friend worked for a company that had a very efficient generator for turning heat from a solar tracking mirror into electricity. the cool thing was that it could use any heat source so they could park the mirror at night over a gas flame and continue to generate

the company failed because of cash flow, not because of the technology
 
The idea is pretty simple: use focused solar energy to heat water (or other carrier: I've heard liquid sodium is ideal) to make super-heated steam to power turbines. At night just use a gas burner or excess heat from a cement kiln or whatever.  The big solar arrays I've heard about have a problem with too much heat. They have to de-focus the mirrors to keep from burning up the piping.

A big problem is birds, though. As you get closer to the 'furnace', the solar rays get more focused, i.e. hotter. Apparently it'll vaporize anything that gets too close. Your Thanksgiving turkey is ready in three seconds flat though.
c.

haresfur

haresfur Avatar

Location: The Golden Triangle
Gender: Male


Posted: Nov 20, 2019 - 4:59am

a friend worked for a company that had a very efficient generator for turning heat from a solar tracking mirror into electricity. the cool thing was that it could use any heat source so they could park the mirror at night over a gas flame and continue to generate

the company failed because of cash flow, not because of the technology
haresfur

haresfur Avatar

Location: The Golden Triangle
Gender: Male


Posted: Nov 20, 2019 - 4:53am



 Red_Dragon wrote:
 

i'm not sure how significant this is, and it's an incremental improvement, not a new technology as the article acknowledges. The cement industry thing is a bit misleading. Yes it uses a lot of heat to make, but a lot of the CO2 release is from turning the limestone CaCO3 into lime CaO and you can't get around that
haresfur

haresfur Avatar

Location: The Golden Triangle
Gender: Male


Posted: Nov 20, 2019 - 4:47am



 ScottFromWyoming wrote:


 Red_Dragon wrote:
 

That's neat, and I wonder about smaller systems on cold days just for heating. Solar cells are cool but it seems more simpler to just gather the heat and warm the house.
 

wear your sunglasses, Mr. ant 
ColdMiser

ColdMiser Avatar

Location: On the Trail
Gender: Male


Posted: Nov 19, 2019 - 4:25pm

 kcar wrote:


 ScottFromWyoming wrote:


 Red_Dragon wrote:
 

That's neat, and I wonder about smaller systems on cold days just for heating. Solar cells are cool but it seems more simpler to just gather the heat and warm the house.
 

Amazing development. If you applied this technology to heating living/working spaces as SFW suggests, I think you'd have to work with large apartment/office buildings.

This is also cool:

Heliogen said it is generating so much heat that its technology could eventually be used to create clean hydrogen at scale.
That carbon-free hydrogen could then be turned into a
fuel for trucks and airplanes."If you can make hydrogen that's green, that's a gamechanger," said Gross. "Long term, we want to be the green hydrogen company."
 
It will be interesting to see if the industries this technology is tailored to, cement, steel etc. will invest in the change over from fossil fuels. Or is it just easier for them to keep what they have in place, continue to use fossil fuels and still make boat loads of money. Its a positive step to develop the tech though. Not holding my breath it will be the new standard. 
kcar

kcar Avatar



Posted: Nov 19, 2019 - 3:55pm



 ScottFromWyoming wrote:


 Red_Dragon wrote:
 

That's neat, and I wonder about smaller systems on cold days just for heating. Solar cells are cool but it seems more simpler to just gather the heat and warm the house.
 

Amazing development. If you applied this technology to heating living/working spaces as SFW suggests, I think you'd have to work with large apartment/office buildings.

This is also cool:

Heliogen said it is generating so much heat that its technology could eventually be used to create clean hydrogen at scale.
That carbon-free hydrogen could then be turned into a
fuel for trucks and airplanes."If you can make hydrogen that's green, that's a gamechanger," said Gross. "Long term, we want to be the green hydrogen company."

ScottFromWyoming

ScottFromWyoming Avatar

Location: Powell
Gender: Male


Posted: Nov 19, 2019 - 10:09am



 Red_Dragon wrote:
 

That's neat, and I wonder about smaller systems on cold days just for heating. Solar cells are cool but it seems more simpler to just gather the heat and warm the house.
Red_Dragon

Red_Dragon Avatar



Posted: Nov 19, 2019 - 10:02am

Secretive energy startup backed by Bill Gates achieves solar breakthrough
NoEnzLefttoSplit

NoEnzLefttoSplit Avatar

Gender: Male


Posted: Oct 8, 2019 - 10:59am

 Lazy8 wrote:
NoEnzLefttoSplit wrote:
Isn't that stuff under enormous pressure?

That's why it's fizzy! Just crack the can open slowly.
 
Great for removing tartar! 
Lazy8

Lazy8 Avatar

Location: The Gallatin Valley of Montana
Gender: Male


Posted: Oct 8, 2019 - 10:51am

NoEnzLefttoSplit wrote:
Isn't that stuff under enormous pressure?

That's why it's fizzy! Just crack the can open slowly.
NoEnzLefttoSplit

NoEnzLefttoSplit Avatar

Gender: Male


Posted: Oct 8, 2019 - 10:41am

 Lazy8 wrote:
Manbird wrote:
We need another form of energy besides stupid old fashioned electricity. Right? One that's almost free to collect and doesn't require physical means of transmission and storage. Right? That would be so cool. Can you work on that?  Oh, and it's completely clean, too. But maybe gives of precious metals and gems as a byproduct. But not too much, just enough so everyone can have about $100,000 per year. (Except stupid old rich people.) 

I would but I'm in the pay of greedy oil companies who give me free plastic straws with their logos on them so I can't make the breakthru that would make me a jillionaire because then how would I sip my fracking water?
 
Isn't that stuff under enormous pressure?
Lazy8

Lazy8 Avatar

Location: The Gallatin Valley of Montana
Gender: Male


Posted: Oct 3, 2019 - 7:12am

Manbird wrote:
We need another form of energy besides stupid old fashioned electricity. Right? One that's almost free to collect and doesn't require physical means of transmission and storage. Right? That would be so cool. Can you work on that?  Oh, and it's completely clean, too. But maybe gives of precious metals and gems as a byproduct. But not too much, just enough so everyone can have about $100,000 per year. (Except stupid old rich people.) 

I would but I'm in the pay of greedy oil companies who give me free plastic straws with their logos on them so I can't make the breakthru that would make me a jillionaire because then how would I sip my fracking water?
Ohmsen

Ohmsen Avatar

Location: Valhalla Mists


Posted: Oct 2, 2019 - 12:45pm

 Manbird wrote:
We need another form of energy besides stupid old fashioned electricity. Right? One that's almost free to collect and doesn't require physical means of transmission and storage. Right? That would be so cool. Can you work on that?  Oh, and it's completely clean, too. But maybe gives of precious metals and gems as a byproduct.
 

Spiders can fly hundreds of miles using electricity


And then of course, there is this Magnetism of Sacred Sites available as spiritual technology, hahaha. 


Manbird

Manbird Avatar

Location: Oroville, Ca
Gender: Male


Posted: Oct 2, 2019 - 12:38pm



 Lazy8 wrote:
 

We need another form of energy besides stupid old fashioned electricity. Right? One that's almost free to collect and doesn't require physical means of transmission and storage. Right? That would be so cool. Can you work on that?  Oh, and it's completely clean, too. But maybe gives of precious metals and gems as a byproduct. But not too much, just enough so everyone can have about $100,000 per year. (Except stupid old rich people.) 
Lazy8

Lazy8 Avatar

Location: The Gallatin Valley of Montana
Gender: Male


Posted: Oct 2, 2019 - 12:24pm

Can Electric Airplanes Put a Dent in Travel Emissions?

Short answer: no, not really.

miamizsun

miamizsun Avatar

Location: (3261.3 Miles SE of RP)
Gender: Male


Posted: Sep 23, 2019 - 12:22pm

sulfur battery tech?

How Inexpensive Must Energy Storage Be for Utilities to Switch to 100 Percent Renewables?

MIT researchers list the energy storage technologies that could enable a 100 percent renewable grid


Another viable technology is flow batteries that would use abundant, low-cost chemicals to store energy in large tanks. But not all flow battery chemistries are inexpensive. One of the main types, vanadium redox flow batteries, have an estimated cost of $100/kWh, the researchers say, but more development could bring down costs.

Chiang is betting on sulfur batteries. He has recently developed an aqueous sulfur flow battery that could cost as little as $10/kWh. The technology has what it takes for long-duration, low-cost storage, and is now being developed by Form Energy, a company he co-founded in 2017 and that has recently gotten extensive financial backing.

There are other battery technologies to keep an eye on. High-temperature sodium-sulfur batteries cost $500/kWh, but with more development, their costs could fall by up to 75 percent by 2030, according to the International Renewable Energy Agency. Meanwhile, the cost of sodium nickel chloride batteries could fall from $315 to $490/kWh at present to $130 to $200/kWh by 2030.

aflanigan

aflanigan Avatar

Location: At Sea
Gender: Male


Posted: Sep 20, 2019 - 10:59am

 miamizsun wrote:


well, not quite (coal is great for pizza ovens)
 
True dat
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