he system configuration for the mixed-mode is shown in Fig. 1 and for the
indirect-mode in Fig. 2. A photograph of the mixed-mode natural convection solardryer is shown in Fig. 3. For the mixed-mode, the drying chamber cover is transparent whereas for the indirect-mode it is opaque. In both configurations, the dryer
width is the same as the collector width. Airflow in the dryer is driven by buoyancy
pressure created in: (a) the single covered collector with flow over the absorber, (b)
the space below the grain bed, (c) the grain bed and (d) the space above the grain bed