A significant
difference was observed between the hybrid mode
and the solar and LPG modes; the slowest drying rate
(0.022 kg water/kg d.s. min) occurred in solar mode, due
to the low temperature reached during the process.In contrast,
drying rates for GHS and HHS exhibited similar constant
drying rate periods, at 0.032 and 0.030 kg water/kg
d.s. min, respectively.