evaluated a multi-purpose transparent solar tunnel dryer with fans powered by PV modules. In these systems, the product to be dried receives energy from both the hot air supplied by the collector and direct exposure to solar radiation; also the product being dried is protected from rain, insects, and dust. They found the product to have high-quality in terms of flavor, color, and texture. In all cases, the use of a solar tunnel dryer considerably reduces drying time in comparison to open-sun drying (Bala et al., 2003). Supranto et al. (1999) carried a study on an experimental solar assisted dryer consisting of a collector, a dryer, an auxiliary burner, and a fan. Tiris et al. (1996) developed a dryer where a fan controlled by a manual valve was used to force the drying air through the collector and the drying chamber. Bena
and Fuller (2002) demonstrated a direct-type natural convection solar dryer combined with a simple biomass burner to provide a drying technology suitable for smallscale drying of fruits and vegetables in non-electrified areas (Bena and Fuller, 2002).
evaluated a multi-purpose transparent solar tunnel dryer with fans powered by PV modules. In these systems, the product to be dried receives energy from both the hot air supplied by the collector and direct exposure to solar radiation; also the product being dried is protected from rain, insects, and dust. They found the product to have high-quality in terms of flavor, color, and texture. In all cases, the use of a solar tunnel dryer considerably reduces drying time in comparison to open-sun drying (Bala et al., 2003). Supranto et al. (1999) carried a study on an experimental solar assisted dryer consisting of a collector, a dryer, an auxiliary burner, and a fan. Tiris et al. (1996) developed a dryer where a fan controlled by a manual valve was used to force the drying air through the collector and the drying chamber. Bena
and Fuller (2002) demonstrated a direct-type natural convection solar dryer combined with a simple biomass burner to provide a drying technology suitable for smallscale drying of fruits and vegetables in non-electrified areas (Bena and Fuller, 2002).
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