Glossary – Grain Systems PNEG-1851 User Manual
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Glossary
aeration — The process of forcing air through stored grain to maintain quality and prevent moisture
accumulation.
batch — The quantity of grain that is loaded, dried, cooled, or unloaded in a single batch cycle.
combination drying — A grain cooling process that combines the high-temperature drying capabilities of
a high-speed dryer with those of a natural air/low-temperature drying bin. In this process, hot grain is dis-
charged from the dryer at a moisture content several points above its target, and placed in a natural air/
low-temperature drying bin where it is immediately cooled and then stored.
concurrent-flow dryer — A type of continuous flow dryer where airflow and grain flow move in the same
direction. As wet grain moves down the grain columns by way of gravity, heated air enters at the top of the
dryer and is forced downward in the same direction. If cooling is required, it is a common practice to have
the cool air move in the opposite direction to the grain. This arrangement improves energy efficiency and
reduces the risk of stress cracks within the kernels. GSI’s portable dryers are crossflow dryers.
continuous flow — A grain drying mode where grain enters and exits the dryer in one continuous, uninter-
rupted cycle.
control scheme — Preset drying strategies designed to help the user achieve the desired outgoing mois-
ture content. Each drying mode includes several control schemes, all of which are based on temperature
or time, a combination of the two, or moisture.
counterflow dryer — A type of continuous flow dryer where airflow and grain flow move in opposite direc-
tions. As wet grain is loaded from the top and distributed evenly throughout the dryer, heated air is forced
through the dryer’s perforated floor and moves upward to dry the grain. As the grain reaches its desired
moisture, a sweep auger removes even layers of the hot grain from the floor, and it is then transferred to a
storage bin to cool. GSI’s portable dryers are crossflow dryers.
crossflow dryer — A type of continuous flow dryer where airflow is perpendicular to the grain flow. As wet
grain moves down the grain columns by way of gravity, heated air is forced across the grain column to dry
the grain. One of the most common and popular types of continuous flow dryers, the crossflow dryer is the
type used for GSI’s portable dryer models.
dry and cool — A grain drying operation where the grain is dried and cooled entirely within the dryer and
unloaded with a temperature that is within 10 to 15 degrees of the outside temperature. Dry and cool can
be used for all grain types.
dryeration — A grain cooling process that requires hot grain to be discharged from the dryer with a slight
amount of excess moisture and heat, tempered for several hours in a dryeration bin, and then slowly
cooled to attain the desired moisture content. Derived from drying and aeration.
dryer length — On a portable dryer, the combined length of all grain columns. See also
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PNEG-1851 Vision N2
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