Author Topic: Real or scam?Cooling from 'sky'  (Read 3590 times)

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Offline RajTopic starter

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Real or scam?Cooling from 'sky'
« on: July 09, 2018, 05:30:19 am »
recently,I had this video popping up in youtube suggestion-
I am quite suspicious it's gonna be like fontis or solar road or something,
but at the same time, I think why would a phd guy destroy his reputation, conjuring up a hoax?
 

Offline larsdenmark

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Re: Real or scam?Cooling from 'sky'
« Reply #1 on: July 09, 2018, 10:50:08 am »
I have no problems with this tech and how it works. It has been published in Nature after all.

Whether or not it'll be economically viable is another thing, but it looks promising.
 

Online BrianHG

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Re: Real or scam?Cooling from 'sky'
« Reply #2 on: July 09, 2018, 05:18:19 pm »
Discussed weeks ago here: https://www.eevblog.com/forum/chat/harnesing-cold-outer-space-on-the-ground-through-a-transparent-ir-wavelength/
Everything you need to know is in the thread.
And, it shouldn't be in the dodgy section.
 
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Offline G7PSK

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Re: Real or scam?Cooling from 'sky'
« Reply #3 on: July 10, 2018, 08:33:23 am »
Nothing that new really.
http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1938851

Thermo siphon power generation using ocean water was proposed in the 60's not sure if any was put into action back then but the ASME paper of 2014 claims it is a first.
 
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Offline IanMacdonald

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Re: Real or scam?Cooling from 'sky'
« Reply #4 on: July 12, 2018, 04:02:16 pm »
This does work, and was used in ancient times to cool water or even make ice.  :-+

The unfortunate corollary for the climate alarmists is that it's the smoking-gun proof that carbon dioxide is not very effective as a greenhouse gas. If it were, then it would not be possible to cool water this way.  :-DD
 

Online BrianHG

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Re: Real or scam?Cooling from 'sky'
« Reply #5 on: July 13, 2018, 01:54:00 pm »
The unfortunate corollary for the climate alarmists is that it's the smoking-gun proof that carbon dioxide is not very effective as a greenhouse gas. If it were, then it would not be possible to cool water this way.  :-DD
Please provide the diffusion, absorbent, reflective and transparent spectrum wavelengths maps of CO2 at atmospheric pressure so I may compare it to the graph provided in the video...
 

Offline tomato

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Re: Real or scam?Cooling from 'sky'
« Reply #6 on: July 15, 2018, 04:28:13 am »
The unfortunate corollary for the climate alarmists is that it's the smoking-gun proof that carbon dioxide is not very effective as a greenhouse gas. If it were, then it would not be possible to cool water this way.  :-DD

The guy does a pretty good job of explaining how the emitted radiation must be at a certain wavelength for this process to work.  In no way does it imply that CO2 is not an effective greenhouse gas.
 

Offline StillTrying

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Re: Real or scam?Cooling from 'sky'
« Reply #7 on: July 15, 2018, 02:04:34 pm »
The guy does a pretty good job of explaining how the emitted radiation must be at a certain wavelength for this process to work.

At least one of us thinks he's wrong.
https://www.eevblog.com/forum/chat/harnesing-cold-outer-space-on-the-ground-through-a-transparent-ir-wavelength/msg1629317/#msg1629317
.  That took much longer than I thought it would.
 

Offline tomato

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Offline StillTrying

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Re: Real or scam?Cooling from 'sky'
« Reply #9 on: July 17, 2018, 12:36:44 pm »
"You disagree with the physics?"

No, the explanation. I suspect it would work with the right type of reflector pointed in the right direction.
.  That took much longer than I thought it would.
 

Offline IanMacdonald

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Re: Real or scam?Cooling from 'sky'
« Reply #10 on: August 02, 2018, 07:42:44 pm »
Emitted radiation wavelength range of bulk solids or liquids is is determined by temperature. Essentially, black body law. (A white or transparent object emits less radiation than a black one, but still behaves as a 'black body' in terms of spectrum.)

I don't see how that can be vastly different from the range emitted by the Earth's surface. Gases are not 'black bodies' though, and behave differently.

Have a play with this to see how it works. The solid lines are the relative energy distribution by wavelength for an 'ideal black' solid object at a given temperature. 
 


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