Peliter cooling question

woody

Member
Paid Member
2002-01-15 12:57 am
Tyrone Ga. U.S.A.
I have seen some refferences to Peliter cooling but haven't
found anything that my math challenged mind understands.
How efficent is Peliter cooling say compaired to a typical A/C
unit or if you wanted to transfer 100 watts from a bank of mosfets
to a heat sink with a 50 degree C difference how much energy would the Peliter units need to do this.

Thanks in advance

Woody AKA bob12345678
 
bob12345678 said:
I have seen some refferences to Peliter cooling but haven't
found anything that my math challenged mind understands.
How efficent is Peliter cooling say compaired to a typical A/C
unit or if you wanted to transfer 100 watts from a bank of mosfets
to a heat sink with a 50 degree C difference how much energy would the Peliter units need to do this.

Thanks in advance

Woody AKA bob12345678
--------------------------------------------------

You will need a large current supply and a place to transfer the heat to (via heat sink). It is also expensive. Not for 100W amps!
 
A Peltier is basically trading efficiency for temperature. You can cool the "cold" side of the peltier to (potentially) below ambient, at a cost of dissipating not only the load heat but also the Peltier dissipation.

Sufficient cooling for the Peltier is critical, as the device will be rapidly destroyed if the temperature differential between the hot and cold side exceeds the specs. Large Peltier devices are usually forced-air or water cooled, as their surface area is so small it is hard to transfer the heat effectively.

You can also run into problems if you get too cold, as condensation will form if you drop below the dewpoint. A lot has been said about this on various PC cooling sites.