Physics Question

Lance · #1 02-25-2009, 11:54 PM

Quote:

Originally Posted by justinl

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?

It is a closed canopy. I thought about installing them this way originally, but was unsure if it was the right way to go.

Mrfish55 · #2 02-26-2009, 12:03 AM

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.

Lance · #3 02-26-2009, 12:46 AM

Quote:

Originally Posted by Mrfish55

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.

The fans just came in today. When am i gonna learn to call you first? I sometimes think you have enough equipment to open your own store.

Mrfish55 · #4 02-26-2009, 02:06 AM

Quote:

Originally Posted by Lance

I sometimes think you have enough equipment to open your own store.

That would be funny if it weren't true

marie · #5 02-26-2009, 02:47 AM

I'm pretty sure I have a couple of ice cap fans sitting around here somewhere not doing anything too

Lance · #6 02-26-2009, 02:56 AM

Quote:

Originally Posted by marie

I'm pretty sure I have a couple of ice cap fans sitting around here somewhere not doing anything too

Oh fer Chrissake!

marie · #7 02-26-2009, 03:00 AM

Quote:

Originally Posted by Lance

Oh fer Chrissake!

Don't feel too badly it would probably take me a week to find them. I've had them for 3 or 4 yrs and never used them

24storm · #8 02-26-2009, 04:20 AM

Quote:

Originally Posted by Mrfish55

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.

This is how i have mine setup as well. I have had no problems my canopy is about a year old. I have aqua medic fans and they have stayed quiet since the install and i have seen no signs of them rusting or salt creep.

Keith

slakker · #9 02-26-2009, 04:30 AM

It's about flow... if you push air in or pull air out... how's the air being replaced. The design with 2 matchedfan pushing and pulling is the best idea I think...

Funky_Fish14 · #10 02-26-2009, 05:35 AM

I have a closed canopy over a covered 75g with two 400w halides, and two bulk 4" fans from Princess Auto.... One pushes air in, the other draws air out at the other end... I have NO heat issues, my tank has only ever peaked at 83 degrees, when our air conditioner was not on for a few hours... during the day the temp is about 79 on average through the year.

If you can keep the heat away from the water... you wont have to cool the water.