Why is absorption AC not used in cars?

[Piotrsko]

Originally Posted by freebeard

I don't follow your thinking.

Your huge bonfire radiates at a lower frequency than the Atmospheric Window.

.

Not following my thinking is the story of my life. Ehh btdt gumo

The quote following my statement said .7 to 10 micro. Ummm 8 to 13 is in there somewhere I betcha.

[freebeard]

Yeah, in the cold light of dawn, there appears to be some overlap.

[aerohead]

Originally Posted by freebeard

Did you look any any of the linked material?


youtu.be/pq8xDXkbXZs?t=159

Clouds are no impediment.

Clouds reflect about 30% of incoming shortwave radiation back to space.
Clouds trap 31.3-Watts/ square meter of out-going longwave radiation.
They, 'presently' provide a net 'cooling' effect, globally.
A carbon dioxide increase will raise the altitude of clouds and they will begin to trap more heat than they reflect.
Then there's around 10-different greenhouse gases trapping more.
The increased global warming will raise the water vapor content of the atmosphere, which is the largest GHG we have ( until surpassed by methane ).
I failed to find any 'band-pass' where long wave could squeak by.
Did those frequencies you mentioned qualify with all GHGs?

[freebeard]

I failed to find any 'band-pass' where long wave could squeak by.

Follow the science. All I know is the sources at Permalink #15 document it. Logically, the Atmospheric Window admits incoming radiation as well as outgoing.

Darkness is a sink?

[aerohead]

Originally Posted by freebeard

Follow the science. All I know is the sources at Permalink #15 document it. Logically, the Atmospheric Window admits incoming radiation as well as outgoing.

Darkness is a sink?

Thanks. I looked at it.
The elephant in the room is the 12-other greenhouse gases which stop infrared, not mentioned.
That's part of the 'science', but omitted from the conversation, for reasons unknown. Potentially very dangerous to a populace motivated to be 'informed.'
After sundown, on a 'clear' night, 'space' is at minus 394 degrees. But if some of the longwave radiation cannot pass beyond the tropopause, it may as well be +33-degrees.
At Montezuma's Castle, in Arizona, the Park Rangers spoke of the indigenous people creating clear-sky-night ice.
I tried it a few times in Lubbock, during college, but never saw results.

[Logic]

Air conditioner in automobiles using exhaust gases / refrigeration using waste heat from ic engine:

https://www.youtube.com/watch?v=p-pKujS0CRw

"horrifically inefficient":
You're using heat that is normally wasted.
Therefore, inefficient or not, you are increasing the efficiency of the car/system as a whole vs NOT using the waste heat for anything.

Question is:
Is the (cooling) power to weight ratio comparable to a stock system, or does it weigh more to the point where you burn more fuel lugging the system around vs a stock system + the engine power reqd to turn the compressor..?
Looking at the vid; I think not, but thats a guess.

Personally:
The Pyrolysis of waste plastics, then feeding the gasses into the intake, seems to be the best use of waste exhaust heat at typical car exhaust temperatures...

[Hersbird]

They can't be shut off and on over short periods of time and they are slow to cool. So it might work on a semi truck that just stays running with the AC left on, but you can't get in the car, turn on the AC, get it cool within a few miles, then 5 mins later shut it off, go into the store for 15 minutes and repeat on the way home. Even the article the OP posted talks about how it protects itself in a power failure. That happens 10 times a day in a car by design.

They are for a slow constant cooling.

I was surprised how little power the AC system used in my PHEV Pacifica. That's a huge volume van and that AC could freeze you out without running the ICE. It used 1/3 the watts of the heater 1500-2000 and that obviously also includes the circulation fan which you would have with either system.

That's under 3 horsepower. So while the van made over 250 using 3 more at idle or even normal driving if anything probably puts it in a better thermal efficiency spot as you are just wasting power with throttle losses and no load. Plus with modern start stop, they can shut it off at a light and there is still enough cold refrigerant in the system to keep it cool until the light changes and the ICE starts again.

The absorption systems can't be too bad as I have had them on a small fridge camper. They would run for a long time on a 20 pound propane bottle or use about 15 amps on a 12 volt circuit. That was a tiny space andbon really hot days it struggled to keep a well insulated 1.3 ft3 box cold.

[aerohead]

Originally Posted by freebeard

It's not a signal, it's heat. Sort of the opposite.

https://www.skycoolsystems.com/technology/


It's a foil with alternating layers of two materials. Something like a vinyl wrap that works better than Ultrawhite paint.

Experienced from space, that portion of the spectra, if escaping the atmosphere, 'could' be interpreted as a 'signal' from Earth.
However, with a dozen greenhouse gases present, it would be good to have at least two other independent sources corroborating the claim.
I've never experienced 'exceptions' mentioned in the reporting.
--------------------------------------------------------------------------------------
And as a reminder, Penn State University's attribution to the so-called 'atmospheric window' was in the context of only water vapor and carbon dioxide, with no mention of all the other greenhouse gases.
My opinion is that, when all the GHGs that are actually present in the troposphere are taken into account, then there would be no such thing as an 'atmospheric window.'

[cRiPpLe_rOoStEr]

Originally Posted by Hersbird

I was surprised how little power the AC system used in my PHEV Pacifica. That's a huge volume van and that AC could freeze you out without running the ICE. It used 1/3 the watts of the heater 1500-2000 and that obviously also includes the circulation fan which you would have with either system.

That's under 3 horsepower. So while the van made over 250 using 3 more at idle or even normal driving if anything probably puts it in a better thermal efficiency spot as you are just wasting power with throttle losses and no load. Plus with modern start stop, they can shut it off at a light and there is still enough cold refrigerant in the system to keep it cool until the light changes and the ICE starts again.

Isn't its compressor electric-driven???

[Hersbird]

Originally Posted by cRiPpLe_rOoStEr

Isn't its compressor electric-driven???

The Pacifica yes, but in a non-hybrid I'm saying a conventional A/C system still makes sense even if it requires the ICE to run to make it work. It's a small 3hp draw.