[time-nuts] Temp/Humidity control systems?
namichie at gmail.com
Thu Oct 27 05:43:37 EDT 2016
The nature of air is that when you heat it by one degree Celcius the humidity falls by 10%.
That does not change the moisture content of the air, just the activity of the same amount of
water vapour with regards to any material with an equilibrium moisture content.
So it is important to control temperature fluctuation if you are going to control relative humidity.
> On 27 Oct 2016, at 8:17 PM, David J Taylor <david-taylor at blueyonder.co.uk> wrote:
> From: jimlux
> 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.
> Thanks for that, Jim, and for the graph.
> Your graph suggests to me that using /any/ form of artificial control may give worse short-term results than simply leaving an underground, uninhabited room with outside walls just "as-is". The slow daily variations may be far more tolerable than excursions due to heaters etc. being switched on and off.
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