Originally Posted by Ultrasonic2 (muffy)
Great so we agree then that Frozen CPU needs to update their site as their own website has conflicting data on it.
Yea buddy. I would like to see at least the enthusiast sites put up some consistent data. People are already confused, and some of the info out there is giving TECs a bad rap.
Qcmax at 27C (300K) is the way most TEC manufacturers list product. But you get about 10% more pumping capacity with the hot side at 50C, and that is where most air-cooled TECs will operate, so that's a useful number too.
ArcticSpider should also be consistent in their descriptions. They have 3 TECs advertised as 226W, 340W and 437W.
The '226W' is a 12724. A normally doped 12724 has 226W Qcmax at 50C Th and max dT of 70C, but the ArcticWeb spec says max dT is 60C. 60C dT would match the older design from TTCC. So not sure what they are selling.
The '340W' shows Qcmax of 345W, so already it doesn't match the label. That is almost certainly the Hui Mao unit, which gives ratings at 27C. At 50C that TEC has Qcmax of 380W.
The '427W' shows 437W Qmax at 32.8A Imax and 26.7V Umax but the same TEC is shown on the '340W' page as 360W Qmax at 24A Imax and 25V Umax. That sure doesn't seem like the same TEC. The first set exactly matches the old style TTCC TEC, the second matches the Hui Mao 19924. I think they changed suppliers when TTCC quit making the 19933, and for some reason (like maybe a much lower Qcmax) don't want to tell buyers.
ArcticWeb needs to clean up their numbers and be consistent. At least give the numbers at a common temp.
FrozenCPU has similar problems. I am pretty sure they also changed suppliers after TTCC quit making the old style 437, but the new one is different than what ArcticSpider is selling. Ignoring the graph, they have 437W Qmax at 32.8A Imax and 26.7V, the same as the 'old' 437 listing at ArcticSpider. But the dT max was changed to 74.4. That spec matches a 19930 in a 62mm package, which is a custom order part from UCD Korea. If that's what they are using, it is actually rated 437W at 27C, 480W at 50C. UCD Korea also has a standard part, 19928, which has 394W Qcmax at 27C, 433W at 50C, but only draws 28A at 26.7V and 27C.
The numbers on eBay are all over the map depending on who is selling, but Thermal Enterprises is pretty consistent in using the Umax * Imax as the 'watts', and always list the actual TEC id so it is possible to figure out what it is. Buyer just needs to know what they are ordering.
Companies like ArcticSpider and FrozenCPU owe it to their customers to be transparent about what they are selling, and give enough spec information so people know what they are getting. If they switch suppliers and are selling a different TEC, they should say so. Otherwise, people will compare their results with someone elses and spend a lot of time trying to figure out 'what they did wrong' when the real problem is they got a lower rated TEC sold as the higher rated part.