[time-nuts] Temp/Humidity control systems?

jimlux jimlux at earthlink.net
Wed Oct 26 16:10:25 EDT 2016

On 10/26/16 9:34 AM, David J Taylor 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.
> Can anyone point me to purveyors of the hardware to do something like
> this?  Because I'll have a limited time to build this, I'm looking for
> something that uses more-or-less off the shelf gear, and not a whole lot
> of custom engineering.
> Thanks!
> John
> _______________________________________________
> John,
> My most stable systems are in an upstairs, walk-in cupboard with two
> outside walls.  If the space is normally unoccupied, you may find it
> stable enough. Can you put a temperature recorder in the space to
> check?  I've used a Raspberry Pi and "single wire" sensor for this.

You can buy the smallest "window" airconditioner and "plumb" it to your 
chamber (I used dryer vent hose, cardboard, and lots of duct tape)

Attached is a plot temperature and RH of an insulated box about 1.2 
meter wide, 2 meters tall and 60 cm deep, filled with 100 or so 750 ml 
bottles of liquid.

The temperature is fairly stable, but the RH varies wildly - basically, 
when the AC unit kicks on, it sucks all the water out of the air in the 
box, and then, when it turns off, the (damp) walls of the box rapidly 
rehumidify the air.

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