. Forster j...@quik.com
Subject: Re: [time-nuts] Cycling of Peltier junction
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Date: Thursday, 9 September, 2010, 22:14
Peltier devices have been used as temperature control elements for
decades. I've never heard of fatigue
Might be worth a glance:
http://www.eevblog.com/2010/07/25/eevblog-101-hacking-your-own-peltier-lab-thermal-chamber/
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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?
Not an
: [time-nuts] Cycling of Peltier junction
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Date: Friday, 10 September, 2010, 8:59
Does anybody know about using the same Peltier junction for both
heating and cooling? I'm concerned about thermal/mechanical shock
when
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
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
there, done that.
Regards...
Don
From: Jerome Peters jpet...@nvidia.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thu, September 9, 2010 2:41:52 PM
Subject: [time-nuts] Cycling of Peltier junction
Does anybody know about using
Peltier devices have been used as temperature control elements for
decades. I've never heard of fatigue failures, but, if I were designing a
chamber as you suggest, I'd try to keep the temperature differential
across the TE element under maybe 15 to 20F. The harder you push it, the
greater the
There is a reference to thermomechanical fatigue in Peltier devices with
respect to the effect of peltier device ripple current on the longevity
of the Peltier devices in the HP Journal article on an optical power meter.
Bruce
J. Forster wrote:
Peltier devices have been used as temperature
Can you just close the system and let the item self heat.
Then you only ever have a cooling problem.
Seems I am familiar with a very large computer manufacture who does it that
way.
On Thu, Sep 9, 2010 at 5:14 PM, J. Forster j...@quik.com wrote:
Peltier devices have been used as temperature
Of paul swed
Sent: Thursday, September 09, 2010 2:55 PM
To: j...@quik.com; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Cycling of Peltier junction
Can you just close the system and let the item self heat.
Then you only ever have a cooling problem.
Seems I am
It's kind of important for the heating and cooling systems to be
able to overlap. I think you will get much tighter control if you
use a simple resistance heater and the Peltier cooler.
-Chuck Harris
Jerome Peters wrote:
Does anybody know about using the same Peltier junction for both heating
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