View Single Post
Old 01-20-20, 07:35 PM   #1
menaus2
Apprentice EcoRenovator
 
menaus2's Avatar
 
Join Date: Feb 2011
Location: Driftless Region, North America, Earth, Solar System, Orion Arm, Milky Way Galaxy,Virgo Supercluster
Posts: 116
Thanks: 13
Thanked 32 Times in 25 Posts
Default Solar Air Heater/ Night Radiative Cooling "Double Play" System?

I've been mulling over a large air based solar heater recently, but the question I've been asking myself is if there is any way to utilize it during the summer for cooling purposes. The idea is to run it at night and use the "white plate" temperature of the night sky to cool the air in the panel, possibly condensate out some of the humidity at the same time. I live in the Midwest US where summer nights can be muggy, and the ability to flush the hot air at night without reintroducing humidity from fresh air would be nice. Some sort of automatic greenhouse type vent would be necessary to prevent stagnation during the day as well as getting rid of the condensation from the night cycle.

From my limited research, there's a guy on the Simply Solar forum who does this with his solar air heater in the Southwest US Desert climate with good results. It also seems like the radiative cooling potential of the night sky is highly dependent on cloudiness, and research papers I've skimmed suggest maybe 30-60 btu/ sqft cooling. Sooo...

-Has anyone tried this?
-Would a higher CFM or lower CFM be more efficient?
-Is this even practical outside a desert-like climate?
-And the obligatory "why not just use a ASHP?"

__________________
Resiliency is the new sustainability.

The Things to do are: the things that need doing, that you see need to be done, and that no one else seems to see need to be done. -Buckminster Fuller
menaus2 is offline   Reply With Quote