Dryeration applications in warmer areas

by Stormy Wylie
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Dear editor,
Cool drying or "Dryeration," when practiced in the corn-growing areas of the United States, implies that the average temperature of the air is about 15° to 20° C. However, in warmer areas of the world, such as the Argentinian Pampas, the average temperatures are in the range of 25° to 30° C. Do you still recommend Dryeration? If so, what increase factor should be applied?

Salvador Garcia
Elmhurst, Illinois, U.S.


Editor's Reply:
I like your description of Dryeration as "cool drying." It is indeed drying (moisture removal) while cooling.

Dryeration will work exceptionally well in your climate. Why? Dryeration cooling of very warm or hot grain in separate cooling bins works on the psychrometric basis of exhausting the air at saturation (100% R.H.) at high temperatures.

For maize drying, saturated cooling air typically exhausts in the range of 50° to 60°C. This air carries 10 to 15 times as much moisture as air from the cooling zone of a high-speed dryer. For other grains that are dried at lower temperatures, exhaust air temperatures may be only 40° to 45°C, but when saturated or near saturation, the exhaust moisture load is still much higher than when cooling in a conventional dryer.

Your average temperatures of 25° to 30°C are typical of some regions of the southern U.S. where Dryeration works very well. Yes, Dryeration will work well for you, improve or maintain high grain quality. Your dryer capacity should increase by 50% to 75% when you stop drying with the grain about 2% higher in moisture and by using the entire dryer for heating with the grain tempering and cooling in Dryeration bins.