TEC undervolting charts

[Bloody_Sorcerer]

Thermal Enterprises model CP1-12726

IDK if they have a website, if you email the guy named thermalenterprises on ebay he may be able to get the values for you. I am very interested in using one of these @5v.

Good to see im not the only one using big pelts at diff voltages

EDIT:

Dividing amperage by the voltage you are running at is not a good way to predict amperage......How are you calculating that?

Just spot checking one example with the kryotherm software, you will be drawing 3.24A from the 80w unit at 5v. Would be interesting to see what is causeing this.

Qc seems to be about right though.

for amperage i was just doing (voltage)/VMax*IMax.The results do seem kinda fishy though.

[Premmer]

for amperage i was just doing (voltage)/VMax*IMax.The results do seem kinda fishy though.

If your 320W undervoltage table is referring to the Thermal Enterprises CP1-12726, suspect it needs a major rework.

Referring to Page 2 of the Thermal Enterprises documentation on the CP1-12726, the graph in the upper left hand corner plots Qc(W) vs dT(C). Look at the intersection point of the I=26A plot with the y-axis scaling of Qc. The value indicated validates the Qcmax noted on Page 1 of 243.5W. This device has a maximum cooling rating of 244W (Th = 27C), in round numbers, at a maximum input power consumption level Pcmax of (15.4V*26A)W.

The 320W Qcmax rating is at a Th = 50C. This would require a Pcmax level considerably greater than (15.4V*26A)W.

[ls7corvete]

If your 320W undervoltage table is referring to the Thermal Enterprises CP1-12726, suspect it needs a major rework.

Referring to Page 2 of the Thermal Enterprises documentation on the CP1-12726, the graph in the upper left hand corner plots Qc(W) vs dT(C). Look at the intersection point of the I=26A plot with the y-axis scaling of Qc. The value indicated validates the Qcmax noted on Page 1 of 243.5W. This device has a maximum cooling rating of 244W in round numbers, not 320W which I believe is hype, at a maximum power consumption level of (15.4V*26A).

If there is a 50mm square 320W Qcmax peltier in the marketplace, it's not this one.

Hmmmm is there one? I still believe this is the most powerfull 50mm.

[Premmer]

I still believe this is the most powerfull 50mm.

That may be but lets refer to the device by its actual Qcmax rating, 244w.

I emailed Thermal Enterprises and posed the following question.
"Your ebay advertisement refers to the device as 245-320w. Your specs clearly state that the maximum Qc of the device is 243.5w . Why do you use the 320w reference in your advertisement? It's misleading to the public".

Their response was as follows.
"We simply follow the same common practice as most other TEC manufactures, we establish the watt rating of our devices under two different operating conditions. The lower wattage rating is established with hot side temperature at 27 deg C. The higher wattage rating is established with hot side temperature at 50 deg C".

After researching the peltier rating subject, I have to agree with Thermal Enterprises response. It is up to the end-user to determine which set of peltier parameters would be most applicable for their operating conditions.

In summary, when peltier maximum cooling power wattage ratings (Qcmax) are expressed by two values as is the case with Thermal Enterprises devices, the lower rating equates to a Th = 27C ambient condition and the higher rating to a Th = 50C. In any well planned CPU peltier/water-cooled system, the Qcmax that would be most representative of their system's cooling performance would be the vaule at Th = 27C.

[ls7corvete]

That may be but lets refer to the device by its actual Qcmax rating, 244w.

I emailed Thermal Enterprises and posed the following question.
"Your ebay advertisement refers to the device as 245-320w. Your specs clearly state that the maximum Qc of the device is 243.5w . Why do you use the 320w reference in your advertisement? It's misleading to the public".

Their response was as follows.
"We simply follow the same common practice as most other TEC manufactures, we establish the watt rating of our devices under two different operating conditions. The lower wattage rating is established with hot side temperature at 27 deg C. The higher wattage rating is established with hot side temperature at 50 deg C".

Interesting, I do think that most applications are going to be running with the TEC closer to the 320w rating than the 244w rating though.

I always assumed that the temperature range we are dealing with in WCing loops was not extreme enough to affect the performace of the TECs, just when I thought I knew enough to give good answers to users in the forums this kind of thing has to come into play.

interesting, I guess I gotta play with kryotherm to see how this affects things.....

[Premmer]

FYI, Wintsch Labs also has 2 ratings on their big peltier.

Th = 50C
Qmax = 437.3W
I(Qmax) = 32.8A
I(dTmax) = 25.2A
Umax = 26.7V
dT = 74.5

Th = 27C
Qmax = 376.8W
I(Qmax) = 30.4A
I(dTmax) = 23.7A
Umax = 24.8V
dT = 66.0

The advertised maximum cooling rating of the Dominator Pro when first released was 360W. After a brief period of time, it was advertised to be 437W with no hardware change to account for it other than quoting its rating based on the Th = 50C spec which I believe is nothing more than technical hype.

In general terms, Qmax @ Th = 27C, which is most likely the most realistic rating to use as a measure of expected performance, is in the range of 60% to 62% of the maxiumum input power for the 226W, 245W and 360W peltiers.

[Stocky]

That is all confusing

Can we conclude which peltier is the MOST POWERFUL at 12V?
(I'm assuming 320W? What about the 350W?)