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Northeast Missouri | Based on how you asked, you probably know all of this but here's how I see it:
Normally I like to cool them just enough to stay with ambient temp., following it on down for winter storage.
But if beans are dry, as yours are, I don't want to cool them much below ambient until I get some humidity. Running 30 degree air through 70 degree beans will initially mostly be raising the temp. and lowering relative humidity of the exiting air. If the 30 degree air is at 50% relative humidity going in, it's going to be well below that humidity as it exits the bin, thus drying the beans a bit more. I'm not looking at an equilib. chart right now, but I think you won't get much drying very quickly with beans that are already at 10% moisture.
If your phone's weather app says ambient humidity is say 50% when you're running the fans @ 30 degrees, take a thermometer to the top of the bin after running fans for an hour and see what the temp is of the exiting air. It might be, say 45 degrees. Somewhere on the web (can't find the link at the moment) I've used a chart or calculation that tells what 50% rel. humidity @ 30 degrees translates to at 45 degrees--might be 27% say. Then look up 27% at 45 degrees in your soybean equilib. chart to see if you're getting any drying--probably so, but not a lot.
I don't have a fancy bin monitoring system--just a thermometer and a smartphone. I like to monitor exiting air temp, and if its down to 5 or 10 degrees above ambient I might quit running fans and try waiting for a more humid day to run them again. In a few days if I haven't gotten a humid day I run fans again for a bit to keep the grain following average ambient temp. as it falls. Unfortunately here beans are also dry but even nighttime humidity is not enough to make much change in their moisture content (I've never had that work much for soybeans anyway).
Opposite situation: if on the other hand the beans were wet, you don't have the luxury of waiting to get them cooled and/or waiting for drier air to run through them....just gotta run the fans.
Edited by Mark in NEMO 10/8/2024 16:14
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Dry Soybean Aeration?
