Overclock.net › Forums › Cooling › Specialized Cooling › Peltiers / TEC › Help with calculations?
New Posts  All Forums:Forum Nav:

# Help with calculations? - Page 3

Quote:
 Originally Posted by Ultrasonic2 (muffy) Before we can understand stacking you must first FULLY understand Qmax and dTmax Qmax is the amount of heat that can be moved to a delta of 0 ( the hot and cold sides are = temps ) dTmax is achieved when NO load is applied to the TEC and at this point Q =0 ( or the TEC can't move any heat load to a delta of 69 ) As you apply a load to the cold side of the TEC the delta is reduced . that means if your cooling a cpu it is impossible to cool it to a delta of 69 So you can't just add the dtmax's together and expect a delta of 138 NOW to stacking If you apply Umax ( full power ) to a TEC to get your Qmax and dTmax then ALL the electricity to do so is lost as heat to the hot side of the TEC . If your running the TEC's at full power then the TECs will use FAR more power than they can move. In the case of stacking the second set of TEC's has to move the previous set of TEC's "WASTE" heat as well as the load applied ( CPU ) this will mean that the total load applied to the second set of tec's will FAR exceed it's Qmax resulting in a fail IE ( im just making up numbers ) TEC can move 400 while used 600 of electricity CPU = 200 CPU =200 TEC 1 moves the 200 while adding 500watts TEC 2 then has to move the 200 watt CPU and the 500watts which equals 700 watts . However the TEC can only move 400 . so this can not work. Now you can get Stacking to work with having FAR more Qmax in the second level and or not running the TEC's at full power. however in both cases the Delta will be significantly reduced from a theoretical 69*2
so then a smaller maybe 90W tec1 followed by a 331-400w tec2 would work while still keeping a good dtmax
 Supra (19 items)
CPUMotherboardGraphicsGraphics
Intel Core i7-2600K 4.0GHz @ 1.160V MSI P67A-GD65 (B3) XFX Radeon HD 6950 2GB Unlocked @ 950/1450 XFX Radeon HD 6950 2GB Unlocked @ 950/1450
RAMHard DriveHard DriveHard Drive
Mushkin Enhanced Silverline 8GB (2 x 4GB) Corsair Nova SSD 32GB 1TB Seagate 6.0GB/s SATA 1TB Seagate 6.0GB/s SATA
Optical DriveCoolingOSMonitor
Lite-On DVD Burner Stock Windows 7 Ultimate x64 Acer S231HL LED Monitor
MonitorMonitorKeyboardPower
Acer S231HL LED Monitor Acer A23IH LCD Monitor eMachines Generic Antec 750W Modular
Antec 1200 Gigabyte Ghost 6000 dpi Desk
 Supra (19 items)
CPUMotherboardGraphicsGraphics
Intel Core i7-2600K 4.0GHz @ 1.160V MSI P67A-GD65 (B3) XFX Radeon HD 6950 2GB Unlocked @ 950/1450 XFX Radeon HD 6950 2GB Unlocked @ 950/1450
RAMHard DriveHard DriveHard Drive
Mushkin Enhanced Silverline 8GB (2 x 4GB) Corsair Nova SSD 32GB 1TB Seagate 6.0GB/s SATA 1TB Seagate 6.0GB/s SATA
Optical DriveCoolingOSMonitor
Lite-On DVD Burner Stock Windows 7 Ultimate x64 Acer S231HL LED Monitor
MonitorMonitorKeyboardPower
Acer S231HL LED Monitor Acer A23IH LCD Monitor eMachines Generic Antec 750W Modular
Antec 1200 Gigabyte Ghost 6000 dpi Desk
Quote:
 Originally Posted by Elloquin I really need to go to bed but...you deserve special attention I miss Zipdogso he had such a flair. Exactly what fluid were you planning to run through the cold side at -110c hell tell me what you are going run at -50c.
idk, anti freeze, WW, 98% alchohol, bleach, dis water....
Edited by Intresting Enough - 9/16/10 at 5:53pm
 Supra (19 items)
CPUMotherboardGraphicsGraphics
Intel Core i7-2600K 4.0GHz @ 1.160V MSI P67A-GD65 (B3) XFX Radeon HD 6950 2GB Unlocked @ 950/1450 XFX Radeon HD 6950 2GB Unlocked @ 950/1450
RAMHard DriveHard DriveHard Drive
Mushkin Enhanced Silverline 8GB (2 x 4GB) Corsair Nova SSD 32GB 1TB Seagate 6.0GB/s SATA 1TB Seagate 6.0GB/s SATA
Optical DriveCoolingOSMonitor
Lite-On DVD Burner Stock Windows 7 Ultimate x64 Acer S231HL LED Monitor
MonitorMonitorKeyboardPower
Acer S231HL LED Monitor Acer A23IH LCD Monitor eMachines Generic Antec 750W Modular
Antec 1200 Gigabyte Ghost 6000 dpi Desk
 Supra (19 items)
CPUMotherboardGraphicsGraphics
Intel Core i7-2600K 4.0GHz @ 1.160V MSI P67A-GD65 (B3) XFX Radeon HD 6950 2GB Unlocked @ 950/1450 XFX Radeon HD 6950 2GB Unlocked @ 950/1450
RAMHard DriveHard DriveHard Drive
Mushkin Enhanced Silverline 8GB (2 x 4GB) Corsair Nova SSD 32GB 1TB Seagate 6.0GB/s SATA 1TB Seagate 6.0GB/s SATA
Optical DriveCoolingOSMonitor
Lite-On DVD Burner Stock Windows 7 Ultimate x64 Acer S231HL LED Monitor
MonitorMonitorKeyboardPower
Acer S231HL LED Monitor Acer A23IH LCD Monitor eMachines Generic Antec 750W Modular
Antec 1200 Gigabyte Ghost 6000 dpi Desk
Okay just for this statement you aren't going to get -110C. Even the commercial 3 layer stacks (pre-stacked), can't do that with the heat provided. So proposing this is just impossible. And to note that about the 3 layer stacks they only move a Q of about 3-5 watts. Nowhere near 500.
 theonering (13 items)
CPUMotherboardGraphicsRAM
Q6600 B3 Asus Striker II Formula 8800GTS 512 SLI Corsair Dominator PC2-8500
Hard DriveOptical DriveOSMonitor
2x Seagate 500GB, 2x Seagate 1TB LG HD-DVD Bluray Windows 7 x64 Samsung Syncmaster 305T+
KeyboardPowerCaseMouse
Razer Reclusa Coolermaster Realpower 850w Lian-Li PC-V2000B Razer DeathAdder
Steelseries Qck+
 theonering (13 items)
CPUMotherboardGraphicsRAM
Q6600 B3 Asus Striker II Formula 8800GTS 512 SLI Corsair Dominator PC2-8500
Hard DriveOptical DriveOSMonitor
2x Seagate 500GB, 2x Seagate 1TB LG HD-DVD Bluray Windows 7 x64 Samsung Syncmaster 305T+
KeyboardPowerCaseMouse
Razer Reclusa Coolermaster Realpower 850w Lian-Li PC-V2000B Razer DeathAdder
Steelseries Qck+
Quote:
 Originally Posted by Intresting Enough so then a smaller maybe 90W tec1 followed by a 331-400w tec2 would work while still keeping a good dtmax
Something like that but obviously a 90watt TEC wont do anything

In my opinion you want twice the Qmax than the load you are cooling
which then allows you to unervolt it a bit

So for my previous example it would be a tec of 400 and 1400watts This bad boy will draw incredible power more than could be plugged into any 240volt 10amp circuit

Now as stated before you dont actually want to run the TEC's at Umax you want to run them at less to reduce the electricity being used by the first level and there fore the Qmax required for the second level will be reduced. However the delta will be reduced in the process . Stacking is incredibly complex .

And i would recommend you dont bother with stacking to be honest

By the why you wont ever get to -80c with a dual stack
Edited by Ultrasonic2 (muffy) - 9/16/10 at 5:51pm
 My System (13 items)
 My System (13 items)
i never said 3 stacks. and if stacks is too much trouble i have no problem going with 1. Im new to peltiers but not to wc. I just wanted to expand my horizon. Its nice to learn something new every now and then.
 Supra (19 items)
CPUMotherboardGraphicsGraphics
Intel Core i7-2600K 4.0GHz @ 1.160V MSI P67A-GD65 (B3) XFX Radeon HD 6950 2GB Unlocked @ 950/1450 XFX Radeon HD 6950 2GB Unlocked @ 950/1450
RAMHard DriveHard DriveHard Drive
Mushkin Enhanced Silverline 8GB (2 x 4GB) Corsair Nova SSD 32GB 1TB Seagate 6.0GB/s SATA 1TB Seagate 6.0GB/s SATA
Optical DriveCoolingOSMonitor
Lite-On DVD Burner Stock Windows 7 Ultimate x64 Acer S231HL LED Monitor
MonitorMonitorKeyboardPower
Acer S231HL LED Monitor Acer A23IH LCD Monitor eMachines Generic Antec 750W Modular
Antec 1200 Gigabyte Ghost 6000 dpi Desk
 Supra (19 items)
CPUMotherboardGraphicsGraphics
Intel Core i7-2600K 4.0GHz @ 1.160V MSI P67A-GD65 (B3) XFX Radeon HD 6950 2GB Unlocked @ 950/1450 XFX Radeon HD 6950 2GB Unlocked @ 950/1450
RAMHard DriveHard DriveHard Drive
Mushkin Enhanced Silverline 8GB (2 x 4GB) Corsair Nova SSD 32GB 1TB Seagate 6.0GB/s SATA 1TB Seagate 6.0GB/s SATA
Optical DriveCoolingOSMonitor
Lite-On DVD Burner Stock Windows 7 Ultimate x64 Acer S231HL LED Monitor
MonitorMonitorKeyboardPower
Acer S231HL LED Monitor Acer A23IH LCD Monitor eMachines Generic Antec 750W Modular