The Kotzur Aeration Controller has been designed to operate the silo fans for a determined number of hours a day, when the ambient weather conditions are optimum for cooling.
The unit is equipped with a temperature and humidity sensor that reads the ambient temperature and humidity in ‘real time’. These readings are used in the controller to calculate the ‘wet bulb’ temperature, which is then compared to a ‘set point’ temperature. When the wet bulb temperature is above the set point temperature the fans will automatically turn on. Wet bulb temperature is used for this comparison as it accounts for temperature and the amount of moisture in the air.
The set point temperature is set initially at 15 degrees Celsius. This temperature is automatically adjusted to account for actual weather conditions, for example; if the temperature does not drop below 15 degrees in one day, the set point temperature is increased, likewise if it does not rise above 15 degrees it will decrease.
- Maintenance Mode: Fans run for an average of 128 minutes a day (or 15 hours per week). If the fans are not able to run for 128 minutes a day (because the temperature is too high, for example), the amount they don’t run will be carried over to the next day, so on and so forth. This mode is used to maintain low moisture grain for long term storage.
- Cooling Mode: Fans run for an average of 214 minutes a day (or 25 hours per week). Like the maintenance mode, the hours not run will carry over to the next days. This mode is used to maintain high moisture grain for long term storage. Also used to cool dry grain in preparation for long term storage.
- Continuous Mode: Fans run continuously 24/7. The fans will turn off if the humidity is over 85%, and turn back on when it drops back below 85%.This mode is used to purge the grain mass when silo is first filled, or after fumigation. Typically, this mode would be run for 5-7 days.