23V at 9 A or 17V at 9A?

Miss_Man · 12-11-2001, 01:29 PM

For a drift 0.8 172 watt peltier thats 24V @ 11A, would 23V @ 9A or 17V @ 9A be better? Which would cool better?

Butcher · 12-11-2001, 02:15 PM

You can't get either of those. Current is not independent from voltage, you pick one and work out the other you don't pick both.
At 23V you'll get 10.5A.
At 17V you'll get 7.8A.
To get 9A you'll need 19.6V
Optimal performance for a TEC is the 75-85% band - 18-20.4V on this model.

Miss_Man · 12-12-2001, 01:18 PM

So 7.8A is what it draws at 17V. Wish I could bring my voltage up to 19V, Either its 23V or 17V, I have no potmeters to adjust in the power supplies. Actually what I meant was if I give it 23V but only 9A since thats all I have, would it give better temps than 17V and giving it all the amps it can take which is 7.8A?

futRtrubL · 12-12-2001, 04:03 PM

What would happen if you attached it to a 23V supply that can give a max of 9 Amps is that the 23V might drop to a lower voltage (while stressing the power supply) or it might just blow a fuse or trip a breaker or if unprotected just melt the power suply, all ways a bad thing.

Edward

PsyKoRealm · 01-27-2002, 01:00 AM

Basically this is my motto:

1. Try it! With pelts you should not give it 100% power but hey, running it at different configurations is what peltier cooling is all about. Don't be affaid to experiment. Of course if you think you run into danger of breaking something then don't do it.

2.Peltiers are like woman.. everyone it unique and needs to be treated differently. So experiment with different configurations.

Brad · 01-27-2002, 05:10 AM

pelts aren't like women, they are hard as hell, and their main body is flat.

at 23v, your pelts wouldn't be too efficient, and your psu might have issues. at 17v however your pelts would be quite efficient, if not being utilised fully, and your psu would be under little strain

kemical · 01-28-2002, 10:10 AM

im no electrician so forgive me if this sounds dumb, but would it be possible to use a couple of large variable resistors in between the pelts and the power supply so you could use just the right amount of power? Or the opposite and use some voltage controlled amplifiers? If its possible, (just day dreaming here) could you then control the resistance/voltage from a rheostat of some sort that your pelt is getting the perfect amount of voltage depending on the temp of the cpu?

Brad · 01-28-2002, 06:09 PM

yes it would, but the resistors would produce a lot of heat, you'd need to cool them with a hsf, which would be sort of negating the purpose if you ask me

decodeddiesel · 01-31-2002, 04:45 PM

http://www.ohmslaw.com

you really should have a basic understand of electricity and how these BASIC princables work before you begin toying with something as complex and dangerous as a TEC. No with a TEC the resistance is not linear, it is dependant on a lot of other things but for approximations of voltage and current using an approximation of the resistance is good enough. Still, read up people this link will demistify a lot of things for you.

12-11-2001, 01:29 PM	#1
Miss_Man Cooling Savant Join Date: Dec 2000 Posts: 151	23V at 9 A or 17V at 9A? For a drift 0.8 172 watt peltier thats 24V @ 11A, would 23V @ 9A or 17V @ 9A be better? Which would cool better?

12-11-2001, 02:15 PM	#2
Butcher Thermophile Join Date: May 2001 Location: UK Posts: 1,064	You can't get either of those. Current is not independent from voltage, you pick one and work out the other you don't pick both. At 23V you'll get 10.5A. At 17V you'll get 7.8A. To get 9A you'll need 19.6V Optimal performance for a TEC is the 75-85% band - 18-20.4V on this model. __________________ Once upon a time, in a land far far away...

01-27-2002, 01:00 AM	#5
PsyKoRealm Cooling Neophyte Join Date: Jan 2002 Location: UC Santa Barbara, CA Posts: 38	More Power Basically this is my motto: 1. Try it! With pelts you should not give it 100% power but hey, running it at different configurations is what peltier cooling is all about. Don't be affaid to experiment. Of course if you think you run into danger of breaking something then don't do it. 2.Peltiers are like woman.. everyone it unique and needs to be treated differently. So experiment with different configurations. __________________ Athlon T-Bird XP 1700+ (1.43@2.0) PURE HSF BABY!!!!!!! EPOX NForce2 EP-8RDA 256MB DDR400 300w PSU 20GIG Western Digital 40GIG Quantum Fireball MSI Gefore 4 Ti4200 @ 280 / 610 48X Lite-On @ 52X Fireware Flash 16X DVD SBLive! Value 10/100 LAN Zalman HSF

01-27-2002, 05:10 AM	#6
Brad Thermophile Join Date: Oct 2001 Location: Nuu Zeeelin Posts: 3,175	pelts aren't like women, they are hard as hell, and their main body is flat. at 23v, your pelts wouldn't be too efficient, and your psu might have issues. at 17v however your pelts would be quite efficient, if not being utilised fully, and your psu would be under little strain __________________ 2x P3 1100's at 1400, Abit VP6, 2x Corsair 256mb PC150 sticks, 20gb 'cuda ATA-III, 2x 40gb 'cuda ATA-IV in raid 0. 20" Trinitron. No fans 2x 2400+ at 2288mhz (16.0 x 143), Iwill MPX2, 2x Kingmax PC-3200 256mb sticks, 4x 20gb 60gxp in Raid 5 on a Promise SX6000. Asus Ti4200 320/630. Cooled by Water

01-28-2002, 10:10 AM	#7
kemical Cooling Neophyte Join Date: Nov 2001 Location: Nashville Posts: 26	im no electrician so forgive me if this sounds dumb, but would it be possible to use a couple of large variable resistors in between the pelts and the power supply so you could use just the right amount of power? Or the opposite and use some voltage controlled amplifiers? If its possible, (just day dreaming here) could you then control the resistance/voltage from a rheostat of some sort that your pelt is getting the perfect amount of voltage depending on the temp of the cpu? __________________ -kem WinXP \| xp1500 @ 1.59ghz \| Iwill xp333-r rev2.1 \| 2X256 Kingston pc2700 \| Radeon 8500 retail \| 431W Enermax Whisper \| 2x 40gig Maxtor 133's in RAID 0 \| Cooling \| DD Maze2-1 \| DD Chipset Block \| 1/2" ID hose and fittings \| ehiem 1250 \| BIX shrouded to a 172mm 200+cfm Rotron Monster \| DD5 \| Custom inline Res \|

12-12-2001, 01:18 PM	#3
Miss_Man Cooling Savant Join Date: Dec 2000 Posts: 151	So 7.8A is what it draws at 17V. Wish I could bring my voltage up to 19V, Either its 23V or 17V, I have no potmeters to adjust in the power supplies. Actually what I meant was if I give it 23V but only 9A since thats all I have, would it give better temps than 17V and giving it all the amps it can take which is 7.8A?

12-12-2001, 04:03 PM	#4
futRtrubL Cooling Savant Join Date: Jul 2001 Location: Kingston, Jamaica Posts: 204	What would happen if you attached it to a 23V supply that can give a max of 9 Amps is that the 23V might drop to a lower voltage (while stressing the power supply) or it might just blow a fuse or trip a breaker or if unprotected just melt the power suply, all ways a bad thing. Edward

01-28-2002, 06:09 PM	#8
Brad Thermophile Join Date: Oct 2001 Location: Nuu Zeeelin Posts: 3,175	yes it would, but the resistors would produce a lot of heat, you'd need to cool them with a hsf, which would be sort of negating the purpose if you ask me __________________ 2x P3 1100's at 1400, Abit VP6, 2x Corsair 256mb PC150 sticks, 20gb 'cuda ATA-III, 2x 40gb 'cuda ATA-IV in raid 0. 20" Trinitron. No fans 2x 2400+ at 2288mhz (16.0 x 143), Iwill MPX2, 2x Kingmax PC-3200 256mb sticks, 4x 20gb 60gxp in Raid 5 on a Promise SX6000. Asus Ti4200 320/630. Cooled by Water

01-31-2002, 04:45 PM	#9
decodeddiesel Cooling Savant Join Date: Oct 2001 Location: classified Posts: 534	http://www.ohmslaw.com you really should have a basic understand of electricity and how these BASIC princables work before you begin toying with something as complex and dangerous as a TEC. No with a TEC the resistance is not linear, it is dependant on a lot of other things but for approximations of voltage and current using an approximation of the resistance is good enough. Still, read up people this link will demistify a lot of things for you. __________________ ...i hurt... do me a favor, disconect me... they can re-work me but i'll never be top of the line again ...i'd rather be nothing...

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