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Phase Change cooling a hermetically sealed rack - Page 2

post #11 of 14
Thread Starter 
It really seems it is a language barrier smile.gif

Ok ignore i3 just to make this simpler, i wont be putting it in the rack there really is no point.

And i know the air in the rack is eventually reach temperatures in my room, i just pointed out the ac can also heat it up if i need to open it quickly.

The i7 i am now building is gonna draw 800W according to online calculators. And my AC has EER rating of 4 (that is efficiency rating in these parts), so i naturally assumed that it will draw 250W to cool 1000W. (spending 250kWh when my computer is running). But since you pointed out it will not work like that since the mass is small and that it will work almost full time and die on me from going on/off constantly i dropped the idea and put 500kWh as maximum power i want the thing to spend.

I am gonna consult a pro tomorrow, hope he wont just ridicule me and hang the phone smile.gif
post #12 of 14
Quote:
Originally Posted by Apostrophe View Post

It really seems it is a language barrier smile.gif

Ok ignore i3 just to make this simpler, i wont be putting it in the rack there really is no point.

And i know the air in the rack is eventually reach temperatures in my room, i just pointed out the ac can also heat it up if i need to open it quickly.

The i7 i am now building is gonna draw 800W according to online calculators. And my AC has EER rating of 4 (that is efficiency rating in these parts), so i naturally assumed that it will draw 250W to cool 1000W. (spending 250kWh when my computer is running). But since you pointed out it will not work like that since the mass is small and that it will work almost full time and die on me from going on/off constantly i dropped the idea and put 500kWh as maximum power i want the thing to spend.

I am gonna consult a pro tomorrow, hope he wont just ridicule me and hang the phone smile.gif

if you have a simple 12kBTU (3.5kWh/h) AC unit, then based on this: http://www.tripplite.com/en/products/model.cfm?txtModelID=4462

I will assume that it draws 10.5 Amps at 110v, or if you have 220V power, 5.25A. either way, while it's running, it pulls 1155W from the plug. you can't de-rate the compressor to match your desired load. it's either on, and pulling just over a kilowatt, or it's off. meaning when it's on, it pulls roughly 1000W, and moves 3500W worth of heat from one side to the other until it stops.


if I do the math based on your 5 hours a day number and 800W for the i7 rig, then 5*30*800W = 120kWh a month for the i7 rig, which, in USD is 120kWh*$.14/kWh = $16 a month USD to run your computer for 5 hours a day.

assuming you run your AC unit to move only the heat produced by your 800W number:
.8kW/3.5kW * 5hours * 30 days
20% duty cycle * 1155W * 5 hours * 30 days = .2*1.155*5*30 = to move ONLY the heat produced by your rig costs $35 a month. However, you want to reduce the temperature of the box to 1C, not hold it at ambient. This will increase energy consumption.

Either way, you're still spending 200% extra in power to run a computer that only pulls 800W.

Speaking of your 800W number, would you mind breaking that down for me?

here's a thread with measured power consumption of rigs:
http://www.overclock.net/t/1126863/real-world-power-usage-user-submitted-values/0_40

A rig with a 5GHz i7 running prime95 and a GTX480 running furmark doesn't even break 600W.

My old rig with watercooling idles around 150W, and running Prime95 on a 3.2GHz Q6700 and Furmark on a stock 4870 pulled 634 Watts at the wall.
FYI a 4770k has a TDP of 84W.
http://ark.intel.com/products/75123

My current rig's CPU has a TDP of 130W - nearly double what yours is rated for, and with dual GPUs at full load, and 80% load on the overclocked CPU, it pulls around 650W at the wall. I have a dual pump watercooling setup and 8 fans in there as well. I'm firing up the 3rd GPU soon, and I estimate total power consumption to be under 750W will everything running.
 
Reginald
(14 items)
 
GLaDOS (v3)
(12 items)
 
CPUMotherboardGraphicsGraphics
i7-970 @ 4.14GHz 1.350v P6T7 WS Supercomputer MSI 7970 GHz Edition HIS 6950 
RAMHard DriveHard DriveCooling
48GB Crucial Ballistix @1660MHz 9-9-9-27 Momentus XT intel 480GB 520 series INX-720 
OSMonitorMonitorMonitor
win7pro Soyo P-MVA 1200p 24" Dell 24" 1200p Dell 17" 4:3 (market tickers) 
KeyboardPowerCaseMouse
Dell Quietkey AX850 PC-Z60 Logitech G5 
CPUMotherboardGraphicsRAM
Q6700 @ 3.0 (stock volts) ASUS P5WDG2-WS PRO HIS 6950 2GB turbo (unlocked) 8GB DDR2 800 
Hard DriveOptical DriveOSMonitor
9550SX w/BBU + 4x 250GB 7.2k Raid 5 HL-DT-ST DVDRW GSA-H30L Kali Linux VNC (TC Rig, baby) 
KeyboardPowerCaseMouse
Dell QuietKey (PS2) Truepower Trio 650 Koolance PC3-420SL Logitech G5 
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Reginald
(14 items)
 
GLaDOS (v3)
(12 items)
 
CPUMotherboardGraphicsGraphics
i7-970 @ 4.14GHz 1.350v P6T7 WS Supercomputer MSI 7970 GHz Edition HIS 6950 
RAMHard DriveHard DriveCooling
48GB Crucial Ballistix @1660MHz 9-9-9-27 Momentus XT intel 480GB 520 series INX-720 
OSMonitorMonitorMonitor
win7pro Soyo P-MVA 1200p 24" Dell 24" 1200p Dell 17" 4:3 (market tickers) 
KeyboardPowerCaseMouse
Dell Quietkey AX850 PC-Z60 Logitech G5 
CPUMotherboardGraphicsRAM
Q6700 @ 3.0 (stock volts) ASUS P5WDG2-WS PRO HIS 6950 2GB turbo (unlocked) 8GB DDR2 800 
Hard DriveOptical DriveOSMonitor
9550SX w/BBU + 4x 250GB 7.2k Raid 5 HL-DT-ST DVDRW GSA-H30L Kali Linux VNC (TC Rig, baby) 
KeyboardPowerCaseMouse
Dell QuietKey (PS2) Truepower Trio 650 Koolance PC3-420SL Logitech G5 
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post #13 of 14
Thread Starter 
I just realized i keep putting kWh without actually dividing anything with 1000. In my defense it is 3am here.

20% of 1155W is significantly less than 800W, it would be under 5$ to run it 5 hours a day full month. AC is a heat pump and even the worst ones have efficiency rating over 3 there is no way in hell it will spend more than the pc itself. My new ac for example has an inverter and EER 5. Im gonna consult a professional and try to get smaller compressor with inverter that can fit in the current installation.

800W came from various PSU manufacturer sites, i7 4770 to 4.5ghz with 2 x 660TI in SLI.
Edited by Apostrophe - 11/17/13 at 6:00pm
post #14 of 14
20% is only a guess, and assumes ideal conditions that only exist when oversimplifying things and assuming everything works perfectly, which nothing ever does.
Many datacenters spend as much money on power to run their cooling as they do the computers in them!

as for 800W, try putting your build into this calc:
http://www.extreme.outervision.com/psucalculatorlite.jsp
and let us know what it says - and feel free to share your build, too.

and remember, the recommended size PSU is based on maximum use of everything. your PSU has to be big enough for those "just in case" moments - most of the time a PC won't draw anywhere near as much power.

For example, when I put my primary sig rig in, it gives a minimum 765W, recommended 815W.
I have 3 GPUs, an overclocked CPU, and watercooling.

My idle draw is a little under 200W, and with the CPU and two GPUs hard at work, it's around 600W. I expect the 3rd GPU to take it to around 700W.

if I stop all the nonsense and game, I generally see 300-400W.
 
Reginald
(14 items)
 
GLaDOS (v3)
(12 items)
 
CPUMotherboardGraphicsGraphics
i7-970 @ 4.14GHz 1.350v P6T7 WS Supercomputer MSI 7970 GHz Edition HIS 6950 
RAMHard DriveHard DriveCooling
48GB Crucial Ballistix @1660MHz 9-9-9-27 Momentus XT intel 480GB 520 series INX-720 
OSMonitorMonitorMonitor
win7pro Soyo P-MVA 1200p 24" Dell 24" 1200p Dell 17" 4:3 (market tickers) 
KeyboardPowerCaseMouse
Dell Quietkey AX850 PC-Z60 Logitech G5 
CPUMotherboardGraphicsRAM
Q6700 @ 3.0 (stock volts) ASUS P5WDG2-WS PRO HIS 6950 2GB turbo (unlocked) 8GB DDR2 800 
Hard DriveOptical DriveOSMonitor
9550SX w/BBU + 4x 250GB 7.2k Raid 5 HL-DT-ST DVDRW GSA-H30L Kali Linux VNC (TC Rig, baby) 
KeyboardPowerCaseMouse
Dell QuietKey (PS2) Truepower Trio 650 Koolance PC3-420SL Logitech G5 
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Reginald
(14 items)
 
GLaDOS (v3)
(12 items)
 
CPUMotherboardGraphicsGraphics
i7-970 @ 4.14GHz 1.350v P6T7 WS Supercomputer MSI 7970 GHz Edition HIS 6950 
RAMHard DriveHard DriveCooling
48GB Crucial Ballistix @1660MHz 9-9-9-27 Momentus XT intel 480GB 520 series INX-720 
OSMonitorMonitorMonitor
win7pro Soyo P-MVA 1200p 24" Dell 24" 1200p Dell 17" 4:3 (market tickers) 
KeyboardPowerCaseMouse
Dell Quietkey AX850 PC-Z60 Logitech G5 
CPUMotherboardGraphicsRAM
Q6700 @ 3.0 (stock volts) ASUS P5WDG2-WS PRO HIS 6950 2GB turbo (unlocked) 8GB DDR2 800 
Hard DriveOptical DriveOSMonitor
9550SX w/BBU + 4x 250GB 7.2k Raid 5 HL-DT-ST DVDRW GSA-H30L Kali Linux VNC (TC Rig, baby) 
KeyboardPowerCaseMouse
Dell QuietKey (PS2) Truepower Trio 650 Koolance PC3-420SL Logitech G5 
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