The
integration of back-up heating components was also
avoided since studies show that recirculation procedures
may only be feasible for processing products with low
moisture content or with the introduction of desiccant
material (Chaudhri et al., 2009). Such improvements
increase both the cost and the design complexity which
limits their use in developing countries that generally rely
on imported, commercial components (Bakeka and Bilgen,
2008)