[time-nuts] Temp/Humidity control systems?

Scott McGrath scmcgrath at gmail.com
Wed Oct 26 14:35:06 EDT 2016

Personally I'd be looking at a commercial ductless heat pump unit Mitsubishi MrSlim comes to mind in your case you would want a 'cartridge' type unit designed for ceiling mount the ones for data center use have humidity control as well.   Figure these units will hold +/- 2-3 deg F over long term

If you really want to go over the top get a used RF shield room.  Lots of used ones coming on market as stuff is going over 26Ghz.  Shipping will be the ugly bit as the doors are heavy

Content by Scott
Typos by Siri

> On Oct 26, 2016, at 1:58 PM, 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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