Development and evaluation of aeration control strategies for maintaining stored grain quality
1995
Chang, C.S. | Steele, J.L.
A grain temperature and moisture content simulation model was used to simulate and evaluate the temperature and moisture conditions of grain during storage with different aeration control strategies. The simulation was based on wheat stored in 6.6 m (22 ft) steel bins to a depth of 3.6 m (12 ft). Local hourly weather data and airflow rates during aeration were used as model inputs. Ambient air temperature, equilibrium moisture content of grain at ambient conditions, and grain temperature were used as the aeration control parameters for different aeration seasons. By aeration, the entire grain mass was cooled during the winter months to below 5 degrees C (41 degrees F) and grain 2 m (6.6 ft) below the top surface and 2 m (6.6 ft) away from the bin wall maintained a temperature below 25 degrees C (77 F) through the summer months. However, grain temperature at 0.3 m (1 ft) below the top surface reached 35 degrees C (95 degrees F) and grain within 0.6 m (2 ft) of the top surface and within 0.5 m (2 ft) of the bin wall was 28 degrees C (82 degrees F) or higher for 75 days. The greatest moisture losses occurred at the top layer during the summer months.
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