[time-nuts] Temp/Humidity control systems?

Mark Spencer mark at alignedsolutions.com
Wed Oct 26 14:27:50 EDT 2016

Hi John.   You might want to look at "precision air conditioning" systems (to use the vendors phraseology) designed for small computer rooms for some ideas ?

I suspect getting close to your temperature spec may be easier than your humidity spec ?   There may also be issues getting commercial units permitted / installed / inspected in a residential setting ?

As a side note I was impressed with the split unit my residential HVAC contractor installed during a recent Reno in my TV room.  The newer units seem to have finer temperature units than the older ones.  I don't believe my unit features any humidity control.

Hope this is of some interest.

Mark Spencer

> On Oct 26, 2016, at 10:58 AM, John Ackermann N8UR <jra at febo.com> wrote:
>> On 10/26/2016 1:00 PM, Richard (Rick) Karlquist wrote:
>>> On 10/26/2016 8:59 AM, John Ackermann N8UR wrote:
>>> I may have the opportunity to build a small "clock room" and am
>>> considering whether I could make it an environmentally controlled space.
>>> I'd like to learn about the options for doing this.
>>> The space would probably be 6x8 feet or so, in a basement with one
>>> outside wall.
>> I'm lost with the basic concept here.  Help me understand this.
> This room would be a large closet in my basement where two racks of various OCXO, Rb, Cs live. There wouldn't be a lot of in-and-out traffic. I'm not looking for 0.01 degree regulation -- <1 degree C and a few percent humidity throughout the year seems a reasonable goal.
> What I envisioned was a very small heat pump or other heating/air-con unit coupled with some sort of proportional control. I just don't know where to start looking for that, or what other issues to be thinking about.
> (I know the way time-nuts think, and I recall the great ideas posted here in the past about using an old refrigerator, or burying standards in a deep hole -- but this would be wrapped into a bigger construction project that I'm going to be managing from a distance, so I need to keep it fairly straight-forward.)
> Thanks, all!
> John
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