gadgeteer123

I would like to know what the tmax of this peltier i got is in Fahrenheit plz, its Tmax is 68 celsius, so what would be the conversion

lockdownx1x

154.4 Farenheit

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gadgeteer123

that seems a bit high for a Tmax especially for peltiers being inefficient, i dont think basic C to F conversion through google is accurate for a tmax, i may be wrong but that how i see it and thats why i asked in here.

Deagle50ae

68 celsius is 68 celsius no matter the application.
YOUR ANSWER

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flak-spammer

The inefficiency of TECs or peltiers comes from energy consumed vs energy moved not the delta they can create.

gadgeteer123

ok so this 177watt qmax 68C Tmax peltier will cool over a 100F below ambient when used in a mini fridge or as a drink cooler?

flak-spammer

at 0w Q yes, however at 177Q the Dt will be 0. So If you are making a drink cooler then it won't be the highest Dt.

zipdogso

There is no special temperature conversion for TEC's a celcius to fahrenheit conversion is the same the world over.

I think perhaps you are slightly confused as to what Dt is, and it is Dtmax NOT Tmax

The Dt is the difference between the hot and cold side. The maximum Dt (Dtmax ) of a single stage 127 TEC is usually about 68-70ºC (143 - 158ºF.)

You are unlikely to see this because the split second you power up the hot side gets hot and the cold side gets cold, the unit is "under load" and the DT will fall.

Because there are a number of variables that affect Dt it is difficult to say you will get x value of DT at any given point.
You can only really run the unit and see.

The main variable for Dt is input power and the less power you apply the less Dt you get.

Dt is important because this determines how cold the cold side gets - Dt is subtracted from the hotside temp - so if you have a high hotside temp you won't get much cooling with a low Dt. BUT also you wont get much cooling with a high Dt if you hotside is too hot, that's why I always say hotside cooling is important without it you won't get cooling at any Dt. Of course if you go silly with hotside cooling and it gets cooler than you coldside you actually get -Dt that rises as the hotside gets colder in relation to the coldside. DON'T FORGET HERE the hot and cold sides are determined by the current flow not whether they are actually hot or cold.

Generally with the 177w 15.6v unit you have run at 12v you could hope for something like a Dt in the 40's ( low 100's in ºF ) or maybe a bit more if you have an excellent setup. But as I already said it is difficult to say exactly what you willl get without running it. Naff TIM, wonky fittings and incorrect pressure etc will all have an effect.

While you might find it amazing for a TEC to deal in 100's ºF consider this - if you connect a TEC to power without any hotside cooling in seconds literally it reaches an internal temperature high enough to melt the solder joins - that's the point where it burns out - typically this is 140ºC - 284ºF. High Temp. TEC's have solder with a higher melting point so go even higher.The other way TEC's typically work down to -50ºC (-58ºF ) so the maximum working range of a standard temp. TEC is over 340 ºF.

ira-k

This is a handy little free conversion tool I've been using for years for temp, mass, area...etc...Ultimate Conversion Tool - Free software downloads and software reviews - CNET Download.com

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