[time-nuts] TECs in cooling below ambient

[Bob kb8tq]

Hi

I think you will find that things work out a whole lot better if you target something
just above room temp. If your room runs 22 +/- 3 C , a set point of 27C likely results
in better operation than 17C. 

Bob

> On Dec 23, 2020, at 2:57 PM, ed breya <eb at telight.com> wrote:
> 
> This recent TEC talk reminded of some of my long term planned projects, and related issues. I have at least four "someday" projects involving TECs, to regulate device temperatures near or below "normal" room temperature, including a high precision DC voltage standard, a sub-fA electrometer circuit, a constant temperature block for nonlinear analog computing elements, and a small general purpose heat/cool box for device and circuit testing. Each has its own particular system, application, and environment issues, but common to all is the lower limit of running temperature, based on the local climate conditions and dew point. I plan to estimate the lowest possible operating temperatures for expected conditions, that avoids condensation, and not having to resort to special packaging.
> 
> An essential thing for this is a dew point calculator. I found lots online, but this is my favorite so far. It's slider-based, so you don't even have to enter numbers.
> 
> http://www.dpcalc.org/
> 
> The harder part is finding the normal range of local climate conditions.
> 
> Ed
> 
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