Peltier Unit

[montecristo#2]

Originally Posted by bobarian

Also, Peltier units cool based upon ambient temperatures. They only cool from 5-7 degrees below ambient in the best case.

Is this true? Just wondering as my temp controlled Aristocrat has cooled more than 10+ degrees below my room temp on hot days. So on a day where it is 76-78F in the house, it is stable at 65-66F.

[shilala]

Originally Posted by montecristo#2

Is this true? Just wondering as my temp controlled Aristocrat has cooled more than 10+ degrees below my room temp on hot days. So on a day where it is 76-78F in the house, it is stable at 65-66F.

Yes, it's true. Depends on the unit and how it's used. Best case scenario is what you described. 10-12 degrees for a thermoelectric are design parameters. Usually they do about what Bob described. Ask them to give you 15 degrees and they run themselves to death and dump water all over the floor.

[bobarian]

I am pretty sure that Bob also over sizes his units for maximum efficiency.

[Wharf Rat]

Originally Posted by montecristo#2

Is this true? Just wondering as my temp controlled Aristocrat has cooled more than 10+ degrees below my room temp on hot days. So on a day where it is 76-78F in the house, it is stable at 65-66F.

It probably depends on the particular device. I had one hooked up once under a piece of glass. It created frost on the top surface. As mentioned, the cold surface will attract a lot of moisture that needs to be removed. Try this website: http://www.peltier-info.com/