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 Post subject: Scythe Shuriken for Silverstone LC11 case ?
PostPosted: Thu Sep 04, 2008 9:08 pm 
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Joined: Thu Oct 06, 2005 8:37 pm
Posts: 29
Location: Hong Kong
Upgrading cpu from 2.6 to 3E GHz Northwood and want to make sure I have enough cooling, currently using Silverston NT03 and thinking about going to the Shuriken... but wondering if this type of cooler might work as the airflow of this case is inverted :

mobo/cpu is on the top ceiling of case facing down, fresh air come from bottom and front to exit from the side. In most case, hot air from cpu goes up, but in this case, standard fan rotation will flow the hot air down

should I try reversing the fan rotation direction ? anyone tried this type setup ?

intake :
http://hothardware.com/image_popup.aspx ... id=638&t=a

exhaust :
http://hothardware.com/image_popup.aspx ... id=638&t=a


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 Post subject: Re: Scythe Shuriken for Silverstone LC11 case ?
PostPosted: Sun Oct 12, 2008 2:09 am 
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Joined: Tue Jul 22, 2008 8:04 pm
Posts: 5
Location: aust
pyro2003 wrote:
Upgrading cpu from 2.6 to 3E GHz Northwood and want to make sure I have enough cooling, currently using Silverston NT03 and thinking about going to the Shuriken... but wondering if this type of cooler might work as the airflow of this case is inverted :

mobo/cpu is on the top ceiling of case facing down, fresh air come from bottom and front to exit from the side. In most case, hot air from cpu goes up, but in this case, standard fan rotation will flow the hot air down

should I try reversing the fan rotation direction ? anyone tried this type setup ?

intake :
http://hothardware.com/image_popup.aspx ... id=638&t=a

exhaust :
http://hothardware.com/image_popup.aspx ... id=638&t=a


If you're still interested in putting a shuriken inside a LC11, i've just installed one but it's not working as well as I planned.
I think the problem is that the fluid inside the heatpipes doesn't transfer down to the finned area of the shuriken when it's installed upside down, not that the air flow is inverted (as you suggested). It's designed so that the fluid in the heatpipes heat near the cpu and flows *up* the heat pipe to the finned area by natural convection, then cools by the air flow, and goes back down the pipe to the cpu. But when it's upside down, the hot fluid just stays near the cpu and doesn't flow to the finned area.
as part of my install, i removed the exhaust from the side of the case - it was a major source of noise because of its rigid fixture to the case. I think i'm going to have to put it back in, or look for a silent alternative (maybe some ducting from the cpu?)
I also noticed the psu was getting very warm too - the air flow through it was not working too well.

So, while the LC11 is sitting upside down, the shuriken did work pretty well, even without the exhaust fan beside it. but, as soon as you put it up-side-up, the whole system starts to cook.


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 Post subject:
PostPosted: Mon Oct 13, 2008 5:50 am 
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Joined: Mon Apr 25, 2005 10:00 am
Posts: 2131
Location: Grand Rapids, MI
It's not a true fluid system. There is mainly just water (or alcohol) vapor and very, very, very small amount of condensed liquid.

The heatpipe should have no problem working upside down as the vapor phase should migrate readily from hot-end to cold-end and condense there. Normal convection rules of hot air rising only work in relation to the system. It's more than likely that the cause is what the OP guesses, that the system is trapping hot air, or that both of you got bum HSFs.

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HTPC: OrigenAE X11|Gigabyte GA-MA785GPMT-UD2H|Phenom II x3 740BE w/AC Freezer 7|150GB Velociraptor|Corsair VX450
Main: Antec 300 (SlipStream @ 800rpm/140mm @ 5v)|Asus M4A88TD-M|Phenom II x4 945 (Mugen2 pass.)|Asus EAH6850|Samsung 830 128GB|Antec TP750
WHS: DF-85|P8H67-M Pro|I5-3450S/Hyper 212+|Corsair AX650|Sandisk Extreme 240GB, 2xWD20EARS, 2x WD15EARS, WD15EADS


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 Post subject:
PostPosted: Mon Oct 13, 2008 9:39 pm 
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-- Vendor --

Joined: Wed Mar 16, 2005 2:29 pm
Posts: 104
Location: Taiwan
The type of heatpipes used does affect performance in different orientations. Our NT03 used powder heatpipes so performence does not change much in any orientations.


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 Post subject:
PostPosted: Thu Oct 16, 2008 8:29 pm 
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Joined: Tue Jul 22, 2008 8:04 pm
Posts: 5
Location: aust
I did some uber scientific testing to check:
turn pc on, allow temp to stabilise, shutdown, turn pc over and turn it back on again.
This was done with no exhaust fan on the side of the case, and some cereal-box-cardboard ducting so the cpu fan would blow straight out the side.
PC is an A3700+ on an Asus A8N VM-CSM


Idle PC test
Image

CPU Burn test
ImageImage


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 Post subject:
PostPosted: Fri Oct 17, 2008 5:57 am 
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Joined: Mon Apr 25, 2005 10:00 am
Posts: 2131
Location: Grand Rapids, MI
There's your proof. Without any exposure to the CPU heat, the entire system temp is rising, due to being inverted. This will raise the temp of the HSF as it's getting warmer air to cool itself.

Just something to be aware of when running a LC11: don't put anything too powerful in there. But I don't really think your temps are horrifically high, even during burn. As long as your HDD is staying somewhat cool.

_________________
HTPC: OrigenAE X11|Gigabyte GA-MA785GPMT-UD2H|Phenom II x3 740BE w/AC Freezer 7|150GB Velociraptor|Corsair VX450
Main: Antec 300 (SlipStream @ 800rpm/140mm @ 5v)|Asus M4A88TD-M|Phenom II x4 945 (Mugen2 pass.)|Asus EAH6850|Samsung 830 128GB|Antec TP750
WHS: DF-85|P8H67-M Pro|I5-3450S/Hyper 212+|Corsair AX650|Sandisk Extreme 240GB, 2xWD20EARS, 2x WD15EARS, WD15EADS


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