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Kolumam

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Reply with quote  #1 
Hi All,

I am curious to understand what's mean by clear sky irradiation. Would be great if you could share some links to it. 

Thank you.

stmbtwle

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Reply with quote  #2 
It's when a hot object radiates heat into a clear sky (space). It does work, HOWEVER unless you have a REALLY clear sky with LOW humidity it doesn't work well enough to be worth the expense (IMO). GOM has tried it in New Mexico and it works there. I've tried it in Florida, not so much. A couple universities have studied it. Try googling "solar cooling", "solar AC", "radiant cooling", etc.

https://simplysolar.supporttopics.com/post/radiant-cooling-7503045?highlight=solar+cooling&trail=10

http://www.fsec.ucf.edu/en/publications/pdf/FSEC-CR-1692-07.pdf

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Willie, Tampa Bay
SolarInterested

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Reply with quote  #3 
Some projects are detailed at BuildItSolar

https://www.builditsolar.com/Projects/Cooling/passive_cooling.htm#ActiveMore

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Both temperature rise and airflow are integral to comparing hot air collectors
Rick H Parker

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Quote:
Originally Posted by stmbtwle
GOM has tried it in New Mexico and it works there. I've tried it in Florida, not so much.


Nights are colder and the night sky is clearer in New Mexico  then Florida. Night Sky Radiation Cooling works when the loss due to Radiation is greater then heat gains from the surrounding air by convection.

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Rick H Parker
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