A TEC is not a very good device for cooling a large enclosure. It works
for the case of a wine coolers because (1) you don't need wine to be very
cool, 55F is fine and you don't open the door very often either. But TECs
do have a good use where they ar perfect. That is cooling some small
electronic device such as an op-amp or CCD sensors or whatever so as to
greatly reduce thermal noise. Noise is many times mostly due to
temperature. You can epoxy a TEX to the device and then a heat sink to
the TEC and make a good spot cooler in just a few minutes. Add a
thermocouple and a control loop and you can make a good temperature
regulated for some small (1" square) part.
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