My guess is you haven't seen a machine like this before

Sweeeeeeeeeeeeeeet!

Well done!!!

isoMorphic wrote in post #15928698
Cold Air falls Hot Air rises.

By sucking air from the top you are sucking in warmer air. Always suck from the bottom and blow out the top for best performance.

Sure, cold air falls and hot air rises, but a fan pushes air around regardless of temp. Air moves, and when it moves it carries its heat energy with it. So you might see a minimally noticeable difference in the first few minutes the system is on in a mid sized room, but pulling that 'hot' air from above and pushing it out the bottom forces it to mix with the 'cold' air below. If you pull from the bottom then you pull the cold air from below and force it to mix with the hot air above... Soon you are hard pressed to be able to measure any kind of notable difference with lab grade gear.

Unless you have one vent within six inches of the ceiling and the other within six inches of the floor, you're not going to see a difference, other than making a more efficient mini-vac for your office's desk, even worse if you place the tower on the floor.

Seriously, which sounds like it will get you better performance? Pushing maybe 0.01 degree warmer air through the system, or sucking 0.01 degree cooler air and a tonne more dust to help clog your cooling fins faster?

Luckless wrote in post #15930310
Sure, cold air falls and hot air rises, but a fan pushes air around regardless of temp. Air moves, and when it moves it carries its heat energy with it. So you might see a minimally noticeable difference in the first few minutes the system is on in a mid sized room, but pulling that 'hot' air from above and pushing it out the bottom forces it to mix with the 'cold' air below. If you pull from the bottom then you pull the cold air from below and force it to mix with the hot air above... Soon you are hard pressed to be able to measure any kind of notable difference with lab grade gear.

Unless you have one vent within six inches of the ceiling and the other within six inches of the floor, you're not going to see a difference, other than making a more efficient mini-vac for your office's desk, even worse if you place the tower on the floor.

Seriously, which sounds like it will get you better performance? Pushing maybe 0.01 degree warmer air through the system, or sucking 0.01 degree cooler air and a tonne more dust to help clog your cooling fins faster?

One of the few times I have agreed with a Canadian....

Luckless wrote in post #15930310
Sure, cold air falls and hot air rises, but a fan pushes air around regardless of temp. Air moves, and when it moves it carries its heat energy with it. So you might see a minimally noticeable difference in the first few minutes the system is on in a mid sized room, but pulling that 'hot' air from above and pushing it out the bottom forces it to mix with the 'cold' air below.

Sorry but you are wrong to put it simply you can't go against the laws of physics and win against proven science. If you don't believe me just read any trusted site run by folks who test all kinds of alternative theories for a living. That or test with your own machine and see how much different it performs with various fan configurations. In some very hot environments even the best fan setup will be challenging as there is no cool air to begin with.

Some Inadvisable Arrangements
1) Intake and exhaust too close: That would ‘short-circuit’ the airflow. The cool (assumed) air is moved out before it comes in contact with the components, decreasing cooling capability.
2) Intakes at the roof: Hot air will stay at the top. Imagine it being sucked in from the top, onto the components. Not lovely, eh?
3) Intakes below the PSU (when PSU is top-mounted, which I personally prefer): For obvious reasons. The hot (no joke) air being expelled from the PSU could be sucked back in, directly onto the CPU. Can you say ‘oven’?

http://www.techspot.co​m …uals-and-analysis.180883/

Fans are generally mounted in the following locations: front, rear, top, and side. The fans on the front of the case are usually primary intakes, drawing ambient temperature air in to pass across hot components. The top and rear fans are exhausts, expelling the warm air out of the case and away from the internal components. In the past this simple air exchange was enough, but in modern systems with powerhouse (and often multiple) video cards, large banks of RAM, and overclocked CPUs, more thought needs to be put into how air travels through an enclosure.

http://www.extremetech​.com …de-to-air-cooling-your-pc

Or I could just go with my science degree, nearly two decades working along side building design and interior climate control work, and common sense. (Seriously, a two foot difference isn't going to give you a noticeable change in temperature for a moving fluid. Have you ever read a book on fluid dynamics or thermal exchange?)

If you coat your cooling fins in an insulator, then it doesn't matter how much colder the air at the bottom is than the top, it is going to do jack all for you. Dust is a beautiful insulator, and you should limit how much can enter your system.

pretty awesome project! that barn wood monitor looks pretty damned slick too.

Pretty cool, I'm using an old wooden stereo to make a PC case at the mo!

having positive or negative airflow also effects cooling. which one you have is determined by your ambient

I'd just find a way to put a filter on the intake fan. That'll solve the dust problem.

That's friggin amazing!

I hope it is water cooled!! If that thing over heats it looks extremely combustible.

Wow...

Really clever design! Bravo!!

philmar wrote in post #15961867
I hope it is water cooled!! If that thing over heats it looks extremely combustible.

I have a thermal shutdown temp set for 80C, which is still well below the combustion temperature of wood. Even then, I highly doubt the CPU will ever get near that.