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Peltier/TEC Hybrid Water Cooling vs 2.0 - Page 26

post #251 of 365
Quote:
Originally Posted by whk0 View Post

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.


Are you a mind reader ? smile.gif
It occured to med on the way home from work. Looking at it now



Going to post back the reading.

Edit:


Cheers Toe
Edited by toeCUTTER78 - 5/4/17 at 11:46am
post #252 of 365
Quote:
Originally Posted by whk0 View Post

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.
Good thinking, I certainly would have missed that biggrin.gif
post #253 of 365
Quote:
Originally Posted by toeCUTTER78 View Post



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.

Careful. You'd be surprised how little torque is required to generate large pressures. Someone can correct me if I'm wrong but I think you're shooting for 300psi. What size is the TEC again?
post #254 of 365
Quote:
Originally Posted by Master Chicken View Post

Careful. You'd be surprised how little torque is required to generate large pressures. Someone can correct me if I'm wrong but I think you're shooting for 300psi. What size is the TEC again?

Its a 62x62mm
post #255 of 365
Quote:
Originally Posted by toeCUTTER78 View Post

Are you a mind reader ? smile.gif
It occured to med on the way home from work. Looking at it now



Going to post back the reading.

Edit:


Cheers Toe


What about the new numbers guys ?
post #256 of 365
Quote:
Originally Posted by toeCUTTER78 View Post

What about the new numbers guys ?
Oh wow, I completely missed that. Numbers look perfect if that's taken a minute or two after you turned it on.
post #257 of 365
Its about a minute or 2 after turning it on, yes.

It starts a bit higher, and quickly drops
post #258 of 365
Quote:
Originally Posted by toeCUTTER78 View Post

Its about a minute or 2 after turning it on, yes.

It starts a bit higher, and quickly drops

Yeah, that's exactly what I'd expect looking at CTE's charts. Sounds like it's working as expected!
Time to chill some CPU's biggrin.gif
post #259 of 365
yeah always measure TEC power consumption directly, not through a kill-a-watt etc, PSU's can vary from like 50-90% efficiency depending on the percentage of total PSU wattage being used.

12v 12A is perfect.

Correct mounting pressure can result in a change in amperage, either up or down, I've never tested it though but I have heard others report amperage dropping a bit with higher pressure. That might have been too much pressure though.

300PSI is absolute max pressure I think, there is a pretty basic formula you need to use to figure out how much torque per bolt. I think with 4 x M4 bolts that aren't oiled it's about 1.5Nm/bolt for a 62mm TEC. I'll get the formula and check.


Edit, here is the formula from Ultrasonics forum, guide to TEC's. http://www.tecpeltier.com/viewtopic.php?f=21&t=19&sid=585c445502e1f2364a6af9cfa3b75864

A.
You should apply about 300 PSI to your TEC to work out how to apply this pressure see the equation below
T = (C x D x F x in2) / (# of screws)

Using the following equation you can solve for torque per screw:
T = torque per screw (in-lbs)
C = torque coefficient (0.20 as received, 0.15 lubricated)
D = nominal screw size (4/40 = 0.112, 6/32 = 0.138, 8/32 = 0.164)
F = Force (lbs / in2)
in2 = Module surface area (length x width)

This per module

C= 0.20 (who oils their bolts)
D= 0.157 (4mm)
F= 300 (150 is the minimum recommended)
in2= 3.875 (50x50mm TEC)
# of screws = 2

18.25125 = (0.20 x 0.157 x 300 x 3.875) / (2)

So to achieve 300psi on the TEC i'd have to tighten each bolt up to 18.25 inch pounds. i'll probably round that up to 20inch pounds. This is actually a very SMALL amount of pressure and will require a special tool to apply. It's my experiences that a TEC with a higher couple count ( higher voltage ) can not withstand as much force as a lower voltage TEC AND the Pressure applied really isn't as important as widely though.




Lets go with M4 bolts (0.157") and use 4 of them without oil, aiming for 300psi on a 62mm TEC .

(0.20 x 0.157 x 300 x 5.958) / (4) = 14 inch pounds

so 14 inch pounds per bolt. or 1.58Nm per bolt. That's not very much at all really.
Edited by LiamG6 - 5/4/17 at 6:44pm
post #260 of 365
Thread Starter 
Looking good so far Toe! thumb.gif
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