Solar dryer, the heat
from the sun couple with the wind has been used to dry food crops for
preservation for the thousand years. Drying depends upon, temperature,
humidity, quality of air used, size of the piece to be dried, physical
structure and composition. Heat is not
the only factor which is necessary for drying. The condition, quality and
amount of air passed over and through the pieces to be dried. The amount of
moisture contained in the air to be used for the drying important and is
referred to as relative humidity. There are three basic design in which others
are based,(1) cabinet dryer (2) tent dryer (3) tunnel dryer (4) commercial
dryer (5) cabinet dryer with ventilator 96) solar cabinet dryer with natural.
There are various
fruits, vegetables, herbs and spices can dry in above solar dryer. Our dryer
are available different sizes according to requirements. size of solar dryer
depends upon how many kg you want to dry and what you want to dry.
Simple solar drying
system suitable for different agricultural fresh commodity was evaluated to dry
banana pulp. The drying system mechanism was flexible, it was constructed from
cheap and available materials (i.e. wood, glass plastic and metals). It
composed solar collector, drying chamber and solar chimney and/or blower. The
air type solar collector was mounted fixed all the year around at 30°. the
drying chamber was flexible to be 0° and 90° with the horizon axis. Simple
passive and active designs were followed to enable save energy requirement for
fan operating. Banana moisture reduction rate, drying coefficient, of banana
and the drying system efficiency were determined. Based on the drying constant
the study found that, the horizontal dryer chamber was speeding banana drying
over the vertical one for both of active and passive modes within the time of
drying for the site and time of investigations. Drying system efficiency for
the forced convection was higher for the first day comparing with the following
days due to the fast drying in the moisture falling stage.
Here is the procedure
of banana drying in solar dryer.
Place the sliced banana on the Dryer in one single layer.
According to your dryer instructions and set the timer for about 24 hours. You
can check it sooner but bananas usually take a long time to dry.
The slices of banana are ready when they snap
easily and don't just bend in the fingers. Leave a few pieces cool first before
trying the snap test as it gives a better indication to whether they are ready
or not.
For longer storage or places with high humidity, little oxygen
remover bags are a handy addition placed in the container or packet – you know,
the little plastic pads you sometimes find in packaged foods? You can buy them
in bulk and use them at home too for home-made dry food storage.