Compressed Air Grid 'Battery'

[Shadow Wolf]

Ever see a kodiak run from a cat...you see black bears run....but they're just an appetizer to kodiak

Note: alligators in the south try to attract cats........ and it ain't to make friends.....

As for kodiak bears, it appears they are too afraid of cats to approach them as there are no videos of the two interacting.

 

[Wu Wei]

As for kodiak bears, it appears they are too afraid to of cats to approach them as there are no videos of the two interacting.

And try the little kitty against this and see what happens

 

[Shadow Wolf]

And try the little kitty against this and see what happens

No videos, no evidence. Kodiak bears are scared of cats.

 

[Wu Wei]

No videos, no evidence. Kodiak bears are scared of cats.

On a similar note....no videos of cats going after Kodiak bears so they don't...and it doesn't happen....therefore your entire premises is null and void so.....

 

[Shadow Wolf]

On a similar note....no videos of cats going after Kodiak bears so they don't...and it doesn't happen....therefore your entire premises is null and void so.....

Prove me wrong.

 

[Wu Wei]

Prove me wrong.

You first

 

[Shadow Wolf]

You first

The absence of evidence of kodiak bears even interacting with cats is the evidence of the absence of their courage, It's the evidence that says they are big weenies when it comes to cats.

 

[Wu Wei]

The absence of evidence of kodiak bears even interacting with cats is the evidence of the absence of their courage, It's the evidence that says they are big weenies when it comes to cats.

 

[Shadow Wolf]

 

[sun rise]

Speaking of bird deaths, it appears that painting the blades black cuts bird death by 70% Bird deaths down 70 percent after painting wind turbine blades

 

[Revoltingest]

Mistakenly posted in another thread (about 6th wave
intersectional post modern feminist marxist research methods)...
Let's look at the efficiency of using that heat....
- Steam engines can hit 40%. Treat this as an unattainable
maximum, given that the compressed air temp air will be
below the operating temps of the most efficient engines.
- At lower temps, stirling cycle would be best. 40% could
be achievable. But again, this is an unattainable maximum,
because it applies only to the stored energy, which will
endure losses in the storage process.

I imagine that 25% efficiency could be possible.

 

[sayak83]

That's quite a silly issue people brought up, because they'll mention that and ignore that lots of other things also kill birds.
Bird–skyscraper collisions - Wikipedia

U.S. Fish & Wildlife Service - Migratory Bird Program | Conserving America's Birds

An Estimate of Avian Mortality at Communication Towers in the United States and Canada

This was never an issue or thought of by many until people brought it up to prevent wind turbines from going up.

Domestic and feral cats are the largest bird killers. But their PR is unassailable....

 

[sayak83]

Mistakenly posted in another thread (about 6th wave
intersectional post modern feminist marxist research methods)...
Let's look at the efficiency of using that heat....
- Steam engines can hit 40%. Treat this as an unattainable
maximum, given that the compressed air temp air will be
below the operating temps of the most efficient engines.
- At lower temps, stirling cycle would be best. 40% could
be achievable. But again, this is an unattainable maximum,
because it applies only to the stored energy, which will
endure losses in the storage process.

I imagine that 25% efficiency could be possible.

Since we are not converting thermal energy to work, this is not the correct estimate.

A compressor can run at 90% efficiency easily. A turbine can also run at 90% efficiency. So IF there are no pressure losses during storage, we can get 0.9*0.9 ie 81% energy recovery. But storage pressure losses are the main issue here. They must have improved on that.

 

[Revoltingest]

Since we are not converting thermal energy to work, this is not the correct estimate.

A compressor can run at 90% efficiency easily. A turbine can also run at 90% efficiency. So IF there are no pressure losses during storage, we can get 0.9*0.9 ie 81% energy recovery. But storage pressure losses are the main issue here. They must have improved on that.

I've never heard of efficiencies that high. Those appear to
exceed the Carnot efficiency (theoretical maximum).
Have any links?
Converting thermal energy to work is certainly worth doing,
given the great quantity generated in such a process.
It could even be used to run a heat engine to augment
the renewable energy running the compressor.

 

[Heyo]

Since we are not converting thermal energy to work, this is not the correct estimate.

A compressor can run at 90% efficiency easily. A turbine can also run at 90% efficiency. So IF there are no pressure losses during storage, we can get 0.9*0.9 ie 81% energy recovery. But storage pressure losses are the main issue here. They must have improved on that.

The losses are high only at high pressure. When you have volume (like an ex gas cavern) you can store a lot of air at low pressure. (But you need special low pressure turbines.)

 

[sayak83]

I've never heard of efficiencies that high. Those appear to
exceed the Carnot efficiency (theoretical maximum).
Have any links?
Converting thermal energy to work is certainly worth doing,
given the great quantity generated in such a process.
It could even be used to run a heat engine to augment
the renewable energy running the compressor.

Carnot efficiency is only if you are using heat energy and converting to work. If you use electricity compressors can run at 90% efficiency, especially if you use multi stage compression. Here is a link to single stage compressor efficiency.
How to Estimate Compressor Efficiency?
Multi stage will be more efficient.

Here is more detailed article on compressed energy storage. Note that typical efficiencies are around 60%
Compressed Air Energy Storage

 

[Revoltingest]

Carnot efficiency is only if you are using heat energy and converting to work. If you use electricity compressors can run at 90% efficiency, especially if you use multi stage compression. Here is a link to single stage compressor efficiency.
How to Estimate Compressor Efficiency?
Multi stage will be more efficient.

The 3 stage example in the link is impressive,
but it's still well under 80%.

Here is more detailed article on compressed energy storage. Note that typical efficiencies are around 60%
Compressed Air Energy Storage

There's more going on than just the compressor.
A motor drives it. Was that figured into the analysis
in the link?
In comparison with batteries or other storage methods,
what matters is overall efficiency of energy in & energy
out. So we have additional inefficiencies in converting
compressed air into power. I wonder what they'll achieve.

Notice...
It's been nearly half a century since I took thermo
courses. It all looks like Greek to me now.