Primer on managing moisture
control for seed drying installations
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
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).
drying process will also stop when the seeds has reeds
the required moisture content. This will prevent that
the seeds became too dry!
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.
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:
1760 AB Anna Paulowna
Tel. +31 223 522824
Fax +31 223 521949
Brochures in PDF