# Heating outside air - how much humidity can it take?

I am trying to figure out this problem - maybe it is simple for someone of you but I can't figure it out.

I have known variables of outside air temperature and relative humidity (RH), I am taking that air into the heater and have two fans that pump 640,000 m$$^3$$ per hour. The air is being heated up to 80 degrees Celsius.

My question is how can I calculate the RH of the heated air and is there any corelations between how much air is being pumped and how much can that air take RH from grain that I am trying to dry?

In short two fans with capacity of 640,000 m$$^3$$ per hour, 100 tons of grain, how to calculate best way and how much air does it need to dry it?

• Are these grains suspended in a stream of air or piled on a floor and blown from above? – Alex Trounev Jul 31 '19 at 14:21
• Grains are piled on the floor ( to be precise on sieves and air is blown from below them and trough them, layer is thick around 1.1 meter) @AlexTrounev – Ivan Ćalušić Jul 31 '19 at 14:55
• Is it organic grains? – Alex Trounev Jul 31 '19 at 16:05
• Yes they are, barley grains @AlexTrounev – Ivan Ćalušić Jul 31 '19 at 19:06
• For barley grains, there is a temperature limit during drying. If the grains are supposed to be used for seeds, then 40C, and if not, then 60C. – Alex Trounev Aug 1 '19 at 2:11