If the drive current ripple is too high fatigue failure from cyclic thermomechanical stress can be significant.
Bruce > On 23 October 2020 at 10:37 ed breya <[email protected]> wrote: > > > Regarding TEC life, in my experience, what wrecks them the most is > cooling applications where the cold side is below the dew point, and > water condenses out onto and into the TEC Peltier array. This eventually > rots the elements from corrosion and electrolysis, until something craps > out. If the TEC will be exposed to ambient air, and run below or even > near the expected dew point, the sides should be sealed up with silicone > goop for longer life. Even then, it's not foolproof, since it will never > be a perfect seal. > > If the TEC is in a closed, benign environment or vacuum, then it should > last indefinitely, unless abused power-dissipation-wise, or mechanically > by thermal stress. When the temperature cycles, the whole part must be > allowed to change dimensions slightly, so the mounting needs to have > some compliance. > > Ed > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
