Complete '24/7' pc running on one 90mm fan - outside!
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Complete '24/7' pc running on one 90mm fan - outside!
Hi guys! I'm new to the forums but I have been reading it for a few weeks. Great stuff
Now I would like to present my own silent pc
It is basically a simple pc built from parts left over from various upgrades. It sits outside on my balcony, in a specially designed weatherproof fiberglass case. Designed by myself, obviously
The whole pc has only one fan, a €9 90mm outtake fan. No fancy cooling equipment installed, no passive cooling towers, no nothing
Okay, I know what you're thinking. I'm nuts.
I agree
But I must add that it's been running great since July 2005. All components are healthy and cool. It started out as a do-or-die test. The components were pretty much redundant anyway. But why outside? The PC wasn't always this silent. Before, I had it suspended in the hallway above my door. Last year I moved and had to find another solution. The only thing close enough was the balcony door. I figured what the hell
Every peripheral is attached through about 12 feet of extensions per cable. The DVD rewriter has an IDE to USB module attached and is mounted in my monitor stand, as is a USB2.0 hub.
The specs:
ASUS A7V8X-X
AMD Athlon 2400+
1024MB RAM 333MHz
GeForce2Pro 64MB
Two lousy HD's
PSU: 230W brandless from the stoneage
The case is made with fiberglass and is weatherproof in the sense that even horizontal rain can't penetrate the case. It's also airtight, apart from two instances: a ducted intake and an outtake in the form of a 90mm fan. As the fan blows warm air out, the ducted intake draws in fresh air directly across the CPU heatsink. This is the heatsink which came free with the CPU. I just unscrewed the noisy fan and threw it out The stream of air is then led across the naked PSU, which I removed from it's casing and seperated from it's noisy fan. After that, the air is pushed out by the fan running via a 5V/12V switch.
Since the mobo was already fanless and the VGA is now passive (I also forcibly removed the fan from that), the whole rig is cooled by the one fan
The results are very good! The CPU runs at ambient + 20C, currently 29C. The northbridge is one degree cooler. Harddisks are running at 37C at the moment.
Okay, some notes.
This is not a performance gaming rig. I have a seperate gaming rig which is very powerful and loud
Silently cooling this download/email/MSN pc isn't very hard. Cooling it with one 90mm fan is something else, mind
Also, the PSU is using the same airstream as the CPU. This is not a good idea, but it seems to work alright. However, it doesn't work so well with the fan at 5V. It doesn't take long for the PC to switch off, probably due to the PSU getting too hot and losing output as a result. The CPU is fine at 5V though, ran steadily at 47C.
Another thing is humidity. The air drawn in will certainly have a higher humidity than you'd get in the house. Truth be told I'm not sure what the effects are. I've seen no evidence of damage when I revised the pc after a year. Humidity is of course relative. The air inside the case will be around 20C, quite a bit higher than ambient. That means that the relative humidity will drop as soon as the air enters the case and gets warmer. I think the result is a climate inside the case which isn't harmful to the components. We'll see in another 12 months, when the next revision is due
As for the noise? There isn't any It's outside, so the teeny bit of noise generated by the single fan is inaudible from my workstation. At 5V, the HD whirring is the only sound you can hear, and even that only when you put your ear right by the case. Not sure whether it's worth my while to work on getting the pc to run stable with the fan at 5V.
Comments are welcome!
But first some pics!
Now I would like to present my own silent pc
It is basically a simple pc built from parts left over from various upgrades. It sits outside on my balcony, in a specially designed weatherproof fiberglass case. Designed by myself, obviously
The whole pc has only one fan, a €9 90mm outtake fan. No fancy cooling equipment installed, no passive cooling towers, no nothing
Okay, I know what you're thinking. I'm nuts.
I agree
But I must add that it's been running great since July 2005. All components are healthy and cool. It started out as a do-or-die test. The components were pretty much redundant anyway. But why outside? The PC wasn't always this silent. Before, I had it suspended in the hallway above my door. Last year I moved and had to find another solution. The only thing close enough was the balcony door. I figured what the hell
Every peripheral is attached through about 12 feet of extensions per cable. The DVD rewriter has an IDE to USB module attached and is mounted in my monitor stand, as is a USB2.0 hub.
The specs:
ASUS A7V8X-X
AMD Athlon 2400+
1024MB RAM 333MHz
GeForce2Pro 64MB
Two lousy HD's
PSU: 230W brandless from the stoneage
The case is made with fiberglass and is weatherproof in the sense that even horizontal rain can't penetrate the case. It's also airtight, apart from two instances: a ducted intake and an outtake in the form of a 90mm fan. As the fan blows warm air out, the ducted intake draws in fresh air directly across the CPU heatsink. This is the heatsink which came free with the CPU. I just unscrewed the noisy fan and threw it out The stream of air is then led across the naked PSU, which I removed from it's casing and seperated from it's noisy fan. After that, the air is pushed out by the fan running via a 5V/12V switch.
Since the mobo was already fanless and the VGA is now passive (I also forcibly removed the fan from that), the whole rig is cooled by the one fan
The results are very good! The CPU runs at ambient + 20C, currently 29C. The northbridge is one degree cooler. Harddisks are running at 37C at the moment.
Okay, some notes.
This is not a performance gaming rig. I have a seperate gaming rig which is very powerful and loud
Silently cooling this download/email/MSN pc isn't very hard. Cooling it with one 90mm fan is something else, mind
Also, the PSU is using the same airstream as the CPU. This is not a good idea, but it seems to work alright. However, it doesn't work so well with the fan at 5V. It doesn't take long for the PC to switch off, probably due to the PSU getting too hot and losing output as a result. The CPU is fine at 5V though, ran steadily at 47C.
Another thing is humidity. The air drawn in will certainly have a higher humidity than you'd get in the house. Truth be told I'm not sure what the effects are. I've seen no evidence of damage when I revised the pc after a year. Humidity is of course relative. The air inside the case will be around 20C, quite a bit higher than ambient. That means that the relative humidity will drop as soon as the air enters the case and gets warmer. I think the result is a climate inside the case which isn't harmful to the components. We'll see in another 12 months, when the next revision is due
As for the noise? There isn't any It's outside, so the teeny bit of noise generated by the single fan is inaudible from my workstation. At 5V, the HD whirring is the only sound you can hear, and even that only when you put your ear right by the case. Not sure whether it's worth my while to work on getting the pc to run stable with the fan at 5V.
Comments are welcome!
But first some pics!
Last edited by Remco_Hitman on Tue Oct 31, 2006 2:15 pm, edited 1 time in total.
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NeilBlanchard wrote:Hello & welcome to SPCR!
Kewl set up! Did you fabricate the case yourself?
Some of us around here are nuttier than others...you'll fit right in!
Thanks... I guess
Yes, I forgot to say I built the case too. It came out really ugly, because I used outdated gelcoat and ran out of spraypaint halfway through lol...
I'm usually quite the perfectionist when it comes to my fiberglass projects, but this time I figured: "out of sight, out of heart"
give your case an IP rating! http://www.aquatext.com/tables/ip_ratings.htm
This is how industrial enclosures are rated for wetherproofing. IP00 = totally open and not waterproof to IP68 = drop it in the deep ocean. I'd say your case was IP13.
So, have you had any small rodents/hobos trying to nest in it yet?
What is that green PCB mounted at right angles to the motherboard - is it your case-removed PSU?
This is how industrial enclosures are rated for wetherproofing. IP00 = totally open and not waterproof to IP68 = drop it in the deep ocean. I'd say your case was IP13.
So, have you had any small rodents/hobos trying to nest in it yet?
What is that green PCB mounted at right angles to the motherboard - is it your case-removed PSU?
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Hehehe! It is indeed a typically Dutch fietsenhok. Well spotted
This http://www.aquatext.com/tables/ip_ratings.htm is really cool! I'd agree on a rating of 13. My sea kayak's hatches would be rated 67
Anyway the PCB you spotted is indeed the PSU. It sits on a 2nd floor built into the case above the mobo. The PSU sits in a space about as big as a standard PSU case, and it's basically the main channel to the outtake fan. That's how the PSU recieves sufficient airflow.
And no, I haven't seen any birds, but it does appear to be a pretty elaborate yet succesful mosquito trap
BTW it has gotten quite a bit colder here since yesterday. Both the CPU and northbridge are now running at 25C. HD's are now at 32C. I'd say ambient is 5C.
This http://www.aquatext.com/tables/ip_ratings.htm is really cool! I'd agree on a rating of 13. My sea kayak's hatches would be rated 67
Anyway the PCB you spotted is indeed the PSU. It sits on a 2nd floor built into the case above the mobo. The PSU sits in a space about as big as a standard PSU case, and it's basically the main channel to the outtake fan. That's how the PSU recieves sufficient airflow.
And no, I haven't seen any birds, but it does appear to be a pretty elaborate yet succesful mosquito trap
BTW it has gotten quite a bit colder here since yesterday. Both the CPU and northbridge are now running at 25C. HD's are now at 32C. I'd say ambient is 5C.
Remco didn't listen to me when I suggested white is the only colour to paint anything in that sits outside ; I believe it did get too hot in summer but that was with the old 'multi fan' setup, hence the white bed sheet over the 'balcony' (wouldn't call it that!) railing.
Its overall quite insane this case (in a good way!)
Its overall quite insane this case (in a good way!)
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haha! Well we don't get bad storms on the Floridian scale over here, but it has gracefully survived last week's 10BFT winds and ferocious hailstorms. It's seen some biblical downpours through the last winter too.
The only problems I've had came during last summer's heatwaves. It was a particularly hot summer this year. However, problems only arose on the three hottest days, when pc's across the country were suffering. Not really an issue for me. I put up the white cover last summer to protect the case from direct sunlight. Worked like a charm. That side of the building catches direct sunlight from noon till sundown so a bit of shade for the old PC was definitely needed.
Condensation resulting in dew or even frost won't harm the pc at all. Condensation only accurs on cold surfaces, while the whole case is warm.
The only problems I've had came during last summer's heatwaves. It was a particularly hot summer this year. However, problems only arose on the three hottest days, when pc's across the country were suffering. Not really an issue for me. I put up the white cover last summer to protect the case from direct sunlight. Worked like a charm. That side of the building catches direct sunlight from noon till sundown so a bit of shade for the old PC was definitely needed.
Condensation resulting in dew or even frost won't harm the pc at all. Condensation only accurs on cold surfaces, while the whole case is warm.
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