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#1
02-25-2009, 10:41 PM
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Physics Question
I'm building a canopy for my tank and am installing two Ice Cap 4" Canopy Fans. Which is more efficient for cooling: drawing the warm air out of the canopy or blowing air on to the surface of the water?
I'm thinking drawing air out would be, but I'm not sure. Suggestions?
__________________
225g reef 
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#2
02-25-2009, 10:43 PM
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I vote drawing air out.
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28g Nano Cube drilled with 13g sump in stock stand. Vertex IN80 Skimmer, Phosban 150 Reactor, Apex Controller, DIY LED with stock hood, dimmable Established March 2006
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#3
02-25-2009, 10:50 PM
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I vote push just to be difficult, but seriously if you are looking at cooling the water then I would think blowing cool air directly onto the waters surface might be more efficient as opposed to sucking air from random air leaks in the canopy.
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#4
02-25-2009, 11:08 PM
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blowing fresh air over the water is by far more efficient. The whole point of fans is evaporative cooling. fans pointed at the water will evaporate more water, therefore it will cool better. is this a closed canopy? Is there any reason you can't have one fan drawing fresh air in and directing it at the water, and have another fan drawing hot air out?
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#5
02-25-2009, 11:15 PM
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The Reef Aquarium Vol 3 recommends blowing air in because sucking air out will likely cause a lot of corrosion on the fan.
__________________
"We shall dive down through black abysses... and in that lair of the Deep Ones we shall dwell amidst wonder and glory forever." - H.P. Lovecraft Old 120gal Tank Journal New 225gal Tank Journal May 2010 TOTM The 10th Annual Prince George Reef Tank Tour
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#6
02-25-2009, 11:20 PM
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I can tell you for sure after I look over a doc at work (brain trust back National hired a Engineer and one of the things they had him studying was having a muffin fan blowing in, or the fan blowing out). Might as well get some of your tax money back.
Personally from looking at the fans I have around the tank/sump, probably better blowing in, rather than having the moist salt air being drawn past the fan. Hey, might be the difference of a fan lasting 5 years rather than 3.
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#8
02-25-2009, 11:39 PM
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blowing air across the surface of the water, so pushing I would say
 (yeah, I went there AGAIN whatigot)
__________________
75 gallon with 20 gallon sump in the works. R. Bacchiega. Tattooer I didn't smack you, I simply High Fived your face. I've got so much glue on my pants it looks like a Friday night gone horribly wrong.
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#9
02-25-2009, 11:54 PM
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Quote:
It is a closed canopy. I thought about installing them this way originally, but was unsure if it was the right way to go.
__________________
225g reef
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#10
02-26-2009, 12:03 AM
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Two fans, one each end. 1 pushing air in the other blowing out. my current canopy is set up this way and both previous custom canopies I have done have also been set up this way, cools the lamps and keeps the heat away from the surface of the water. If you don't have the fans yet I do have a spare 4" variable speed ice cap fan, for you I make to be good deal ya.
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