[time-nuts] Cycling of Peltier junction

Don Latham djl at montana.com
Thu Sep 9 20:43:32 UTC 2010


For this temp range, thermal shock or reversal should not be a problem.
Neither is reversal, just use a (relatively) cheap h-bridge off epay...
working out the water temp might be a problem? There will be no problem
with h-bridges, as the Peltier junction has very small L-C values, ie not
like a motor...
Don

Jerome Peters
> Does anybody know about using the same Peltier junction for both heating
> and cooling?
> I'm concerned about thermal/mechanical shock when changing the polarity
> back-n-forth between hot and cold.  Maybe there needs to be a controlled
> ramp, if so then how do I figure out the rate?
>
> Why:
> I'm in the process of building a small environmental chamber for my home
> lab. The volume is ~30 liter, target temp range of 0C to 60C.  For the
> cooling side I am using water circulation (radiator, pump, reservoir &
> water block) and Peltier junctions.  At first I was planning to have two
> separate systems, one for heating and one for cooling, but then I got to
> thinking that using just the water and Peltier could be used for both.  I
> will be using a PID for temp control, and two TEC1-12726 Peltier Qcmax(w)=
> ~240 $B"$(BT =0j
>
>
> Regards,
> Jerome
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-- 
"Neither the voice of authority nor the weight of reason and argument are
as significant as experiment, for thence comes quiet to the mind."
R. Bacon


Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com




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