Moisture control for seed drying installations

Drying seeds more economically to the desired moist content with your existing drying installation.
If the average airtemperature increase the absolute moisture content will also increase. Drying seeds to the equilibrium will not succeed when a fan of a drying installation extract humid air. In the final drying  phase dry air is needed to remove the last percentage of moist out of the seeds.

Most people look only to the Relative Humidity (RH) of the air.

Warm air has more energy and therefore can absorb more water than cold air. Warm air has a higher moisture content (AM) than colder air, also when the RH is low. Because of this, cold air is better to dry with than warm air. Cold air need to heat up before it can absorb water. This will cost energy. To
compare the extracted air conditions with the air conditions that is coming out of the seeds, the drying process can be run more efficient.

Newly harvested seeds have mostly a high moisture content. The moist in the seeds can be removed easily by blowing dry air trough the seeds. The exchange of moist to the drying air goes smoothly when the moisture content of the seeds is high. When the seeds became more dryer the exchange of moist to the drying air will decrease. The drying process will slow down. To optimize the drying process dryer air is needed to remove the last percentage of water out of the seeds.

To dry seeds to the required moisture content we have to measure the air condition that is coming out of the seeds. The drying installations of Agratechniek compare the outdoor (extracted) air conditions with the air conditions out of the seeds, automatically . If the extracted air is dryer comparing to the air that come out of the seeds, the drying process goes well. If the extracted air content more moist than the out coming air, the drying process will stop. This will prevent that moisture content of the seeds will increase again and it will save energy (= money).

The drying process will also stop when the seeds has reeds the required moisture content. This will prevent that the seeds became too dry!

With the Agra-Moist-Control (AMC) the air conditions of the extracted air and the out coming air will be permanent be measured. The drying process can run perfectly when the outdoor temperature is low and the RH is high. Better(dryer) air conditions will result in a faster drying process.

The AMC processor will calculate automatically which air conditions are allowed. Cold nights with a high RH content can be good conditions to dry with.

The AMC controller stop the drying process automatically when the seeds has reached the required equilibrium moisture content.

This also prevent unnecessary process hours. The process hours are logged so the energy costs can be calculated. The log timer can be reset to 0 in the beginning of the year or season.

For more information:

Agratechniek BV
Postbus 91
1760 AB Anna Paulowna
The Netherlands
Tel. +31 223 522824
Fax +31 223 521949
E-mail: info@agratechniek.com
Web: www.agratechniek.com

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