Grain Systems PNEG-501 - Manual (Page 13)

13
Fan/Heater Application
SUGGESTED AIRFLOW RATES
Aeration
This ventilation of stored grain to maintain
uniform moisture and temperature, uses low
airflow rates and unheated air. The lowest
rates are for dry grain and higher rates are for
higher moisture contents.
Corn 1/10 to 1/5cfm/bu
Wheat 1/13 to 1/8 cfm/bu
Beans 1/10 to 1/7 cfm/bu
Rice 1/10 to 1/7 cfm/bu
Dryeration and Cooling
Natural unheated air used to cool heated grain
and/or take out remaining few moisture points.
1/5 to 1/2 cfm/bu
Wet Holding
Higher airflow rate for maintaining wet grain
for short periods of time, generally one days'
conditioning capacity or no longer than the
recommended SAFE STORAGE TIME.
1/2 to 1 cfm/bu
NOTE:
USE MAXIMUM BIN CAPACITY
TO SIZE FANS FOR APPLICATIONS IN
THIS COLUMN
Natural Air Drying
Unheated air used on low moisture harvested
grain to remove remaining moisture points,
use layer method or full bin depending on
initial moisture, the airflow rate selected will
depend on geographic location and prevailing
weather conditions.
1 1/2 to 2 1/2cfm/bu
Low temperature Drying
5 to 20 degree F temperature rise, high airflow
rates, equilbrium drying system generally
employed with layer or full bin, stirring device
suggested.
1 to 2cfm/bu
High Temperature Drying
120-160 degree F plenum temperatures, high
airflow rates, batch or layers recommended
with stirring devices.
3/4 to 1 1/2cfm/bu
NOTE:
USE 1/2 TO 3/4 BIN CAPACITY TO SIZE
FANS FOR APPLICATION IN THIS
COLUMN. THIS WILL AVOID
UNREASONABLE FAN SIZES.