Discussion
Which of the following is not a type of solar dryer?
Answer: C
The one that is not a type of solar dryer is the Forced conduction-type solar dryer.
Solar dryers are classified by how air moves through them: natural convection (air rises by buoyancy) and forced convection (a fan moves the air). Designs include cabinet dryers, low height solar tunnel dryers and walk-in-type solar tunnel dryers, which are large polyhouse-like dryers that a person can walk into.
Air cannot be 'forced' by conduction. Conduction is heat transfer through solids, so 'forced conduction-type' is a mixed-up term and is the odd one out.
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