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Peltier/TEC Hybrid Water Cooling vs 2.0 - Page 25

post #241 of 421
Quote:
Originally Posted by goodoleguy View Post




This is one of the blocks I used between the peltier hot side and air cooler.


What TEC's and waterblocks are you using GoodOleGuy ?

Cheers Toe
post #242 of 421
Guys, I need your comments on my new TEC's power draw.

It's a Wellentech 199 couple, 24volt, 28A, 400QcMax TEC run at 12v and it consumes approximately 190w - thats around 16 amps.
Is this way off, or do you think this sounds reasonable ?

I seem to recall Puck mentioning the CTE400 which has similar specs and that it should draw around 13-14 amps at 12v.

Cheers Toe
post #243 of 421
if it is the equivalent of the CTE 400w TEC at 12v it should draw about 13 amps when it has a delta of 20-30*c and the hot side is at about 30-40*c. ~150w is normal for 12v

16 amps sounds like far too much. What PSU? Correct voltage? The CTE TEC would pull 16A at about 13.5-14v and 0*c delta.

If you hold a light up behind the TEC you can count the couples to verify that it is a 199 couple 24v TEC to make sure it is correct.

are you testing this with the TEC clamped by the block with the correct PSI?
Edited by LiamG6 - 5/4/17 at 3:54am
post #244 of 421
Thread Starter 
Quote:
Originally Posted by toeCUTTER78 View Post

Guys, I need your comments on my new TEC's power draw.

It's a Wellentech 199 couple, 24volt, 28A, 400QcMax TEC run at 12v and it consumes approximately 190w - thats around 16 amps.
Is this way off, or do you think this sounds reasonable ?

I seem to recall Puck mentioning the CTE400 which has similar specs and that it should draw around 13-14 amps at 12v.

Cheers Toe

If you are only supplying half of the spec'd voltage then you should only expect half of the spec'd wattage and amperage.

My peltiers were spec'd at 15.4v, 26amp, 245w, supplying 12v dropped to 20amp, 200w.
Edited by OCAddict - 5/4/17 at 4:52am
post #245 of 421
Quote:
Originally Posted by OCAddict View Post

If you are only supplying half of the spec'd voltage then you should only expect half of the spec'd wattage and amperage.

Actually, power (wattage) is VI or V squared / R or I squared R so if you halve the voltage you'd expect the power to be reduced by a factor of 4 (approximately for TECs since they are non linear).
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post #246 of 421
Thread Starter 
Affirmative!
Edited by OCAddict - 5/4/17 at 6:57am
post #247 of 421
Quote:
Originally Posted by LiamG6 View Post

if it is the equivalent of the CTE 400w TEC at 12v it should draw about 13 amps when it has a delta of 20-30*c and the hot side is at about 30-40*c. ~150w is normal for 12v

16 amps sounds like far too much. What PSU? Correct voltage? The CTE TEC would pull 16A at about 13.5-14v and 0*c delta.

If you hold a light up behind the TEC you can count the couples to verify that it is a 199 couple 24v TEC to make sure it is correct.

are you testing this with the TEC clamped by the block with the correct PSI?


The psu is an old Antec TruePower 550w
All 12v wires are in use except the ones from the ATX connector.
http://www.tweaktown.com/reviews/305/antec_truepower_550watt_power_supply_review/index2.html

I havent measure the voltage, will do when i get home.

The TEC is mounted, so I cannot see through it anymore :-)

The correct pressure/PSI ... I'm sure it's not to tight - its just bare tight with a screw driver.
I will try and tighten the bolts a bit tonight.
Problem is that i have the EKWB Mx ... with plexi top.
I had a leak the other day, and i think it was due to high strain on the mounting bracked to it "bent" the plexi enough for water to escape - well that's just my theory anyhow.

I would like some metal tops as Tool suggested - but havent been able to find any in Europe , only the link to performance pc's Tool posted.

How will the pressure change the current draw ?


Cheers Toe



Edit:
I plotted my measured power consumption (from kill-a-watt clone) and simply calculated the amps, given the theory that my psu outputs 12v(to be determined).
I inserted the max current at 24v(from datasheet) and 0A at 0v.
Looks reasonably linear.


Edited by toeCUTTER78 - 5/4/17 at 5:54am
post #248 of 421
Quote:
Originally Posted by toeCUTTER78 View Post

How will the pressure change the current draw ?


Cheers Toe



Edit:
I plotted my measured power consumption (from kill-a-watt clone) and simply calculated the amps, given the theory that my psu outputs 12v(to be determined).
I inserted the max current at 24v(from datasheet) and 0A at 0v.
Looks reasonably linear.


Pressure should improve the heat transfer between the plates and the TEC which should reduce the temperature difference between the hot and cold sides of the TEC at a given TEC voltage and that ought to result in an increase in the current at that voltage.

That graph ought to be at least a 2D surface on a 3D plot where the other dimension is either deltaT or Q. For example, the voltage with no current depends on deltaT. If there is some deltaT then there will be a voltage across the TEC when the current is zero. The TEC parameters vary with absolute temperature too which would be a fourth dimension.
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post #249 of 421
Quote:
Originally Posted by heb1001 View Post

Pressure should improve the heat transfer between the plates and the TEC which should reduce the temperature difference between the hot and cold sides of the TEC at a given TEC voltage and that ought to result in an increase in the current at that voltage.

That graph ought to be at least a 2D surface on a 3D plot where the other dimension is either deltaT or Q. For example, the voltage with no current depends on deltaT. If there is some deltaT then there will be a voltage across the TEC when the current is zero. The TEC parameters vary with absolute temperature too which would be a fourth dimension.

If I understand you correctly if i had had a too high pressure that would have had explained the 16A ?

Cheers
post #250 of 421
You're using indirect reading (by using a type of kill-a -watt) and calculated, you should subtract the loss of the power supply you using. Lets say your PS's efficiency is 85%, 16A * 0.85 = 13.6A.
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