by wheels » Tue Jun 30, 2015 8:29 pm
That's a better idea. Use the fan just for circulation of the air rather than to (attempt to) control RH.
This area is so difficult though as what works for one doesn't work for another. It's very much a case of trial and error - if the fridge is for air drying that is?
The point I was trying to make, but doing it badly, was that a system open to the outside will draw in air at ambient temp/RH which might not be beneficial. For example: the introduction of air at 22°C and 75%RH will increase the humidity in the fridge. It's got to as when the air's cooled to 10°C the previously 75% RH air will be 100%RH+. It's got to be, its dew point's around 17°C. Now that maybe looks beneficial if you want to increase humidity, except that, at the same time the 22°C air will start the fridge motor running and the usual result of this is that the RH will drop. The two will work against each other.
I hope that makes sense.
Phil