Solar drying systems are classified according to mode of
heating (direct or indirect) and the manner in which solar
energy is used. In general terms, these systems may be
placed into one of two main groups: (a) active solar drying
systems, and (b) passive solar drying systems (Ekechukwu
and Norton, 1999a). There are three distinct subclasses for
each major class, defined primarily by the design and
arrangement of the components and the mode in which
solar energy is utilized: (a) integral-type solar dryers; (b)
distributed-type solar dryers; and (c) mixed-mode solar
dryers. However, the disadvantage of these dryers is th