As I did say I wasn't going to post again in this thread, this is actually an informative post to show the basis of accuracy for Ultrasonics calculator.

In response to the accuracy of ultrasonics calculator, Ultrasonic has provided this information:

On some forms the accuracy of my TEC calculator has been in question.

So it seems the best way to prove the calculator is pretty much right, is to put it against other manufactures numbers.

First my app will go head to head with another TEC simulator then real test numbers performed by a different TEC manufacture.. Seems a fair test to me

Here is the Kryotherm TEC calculator in comparison to mine it's Pretty Pretty close including all the random stuff like COP!

Above is the Kryotherm pic

At delta of 4.4c (TH-TC)

while moving a load of 124 watts (QC(W)

which requires 7.14 amps

Below is my app

it gets

a delta of 4.43c

while moving a load of 124 watts

which requires 7.13 amps

Above is the Kryotherm pic

At delta of 54.2c (TH-TC)

while moving a load of 30 watts (QC(W)

which requires 9.11 amps

Below is my app

it gets

a delta of 54.69c

while moving a load of 30 watts

which requires 9.08 amps

Above is the Kryotherm pic

At delta of 13.5c (TH-TC)

while moving a load of 10 watts (QC(W)

which requires 1.39 amps

Below is my app

it gets

a delta of 13.47c

while moving a load of 10 watts

which requires 1.39 amps

Above is the Kryotherm pic

NOW WHAT HAPPENS IF WE CHANGE THE HOT SIDE TEMP TO 50C

At delta of 33.3c (TH-TC)

while moving a load of 20 watts (QC(W)

which requires 3.44 amps

Below is my app

it gets

a delta of 33.35c

while moving a load of 20 watts

which requires 3.45 amps

http://www.customthermoelectric.com/tecs/pdf/19911-5M31-28CZ_spec_sht.pdf
Here we have CTE's 400Qmax TEC with REAL test data so i've put a few points on their graph then i'll bang those numbers into my app and see how close i get. Now remember this is REAL test DATA V my theoretical data

Now at point A they get

At delta of 20c

while moving a load of 150 watts

which requires just over 12 amps

Below is my app

it gets

a delta of 20c

while moving a load of 150 watts

which requires 13.3 amps (within 10%)

Now at point B they get

a delta of 30c

while moving a load of 175 watts

which requires 20 amps

Below is my app

it gets

a delta of 28.8c (within 4%)

while moving a load of 175 watts

which requires 20.13 amps

Now at point C they get

a delta of 60c

while moving a load of 0 watts

which requires 28 amps

Below is my app

it gets

a delta of 62.0c ( i based my numbers on a delta of 62 which it's advertised as )

while moving a load of 0 watts

which requires 28.0 amps

Now at point D they get

a delta of 0c

while moving a load of 400 watts

which requires 28 amps

Below is my app

it gets

a delta of 0.0c

while moving a load of 0 watts

which requires 28.0 amps

Now obviously these is a slight variance in some of the numbers this is partly because im basing the DELTA on 62c while in there test it only achieves 60c and at the end of the day this is theoretical verses real data it's not going to be 100% right but it's DARN CLOSE !

The calculator is only calculating the TEC part of the equation and is not including the thermal resistance of the radiator, water, flow rate, copper water block, TIM. Then TEC then TIM again then copper then TIM again and lastly the Thermal resistance of the IHS and Silicone .

This is how people seem to use calculators.

Ambient is 22 so the hot side of the TEC will be 22c

I'll apply 12volts and that gives me a TEC cold side of -10

And therefore the CPU temps read from apps like core temp will be -10

Yeah Right!

At the end of the day it's just an estimator

While someone maybe

**unable** to make a block that replicates

**their** understanding of the widely available data, That does not make the mountain of data is wrong. In allot of cases they have miss estimated in the first place though a lack of understanding.