Conclusion
This work has shown the potential of using air at low-temperatures and low RHs to dry rough rice without adversely affecting
product quality. Experimental data describing thin-layer drying
characteristics of rough rice were obtained under controlled conditions representing low-temperatures and low-relative humidities.
The drying data was well described using the Page equation and
equations were developed to predict drying parameters k and n
as functions of temperature and RH within the range of the experimental conditions. Results showed that drying duration can be
shortened significantly by reducing the RH at given temperature,
particularly lower temperatures, thereby supporting the concept
of dehumidification of drying air. Product quality, expressed as
HRY and color of rice samples dried at low-temperatures and low
RHs, was maintained. The peak and final viscosities of the lowtemperature dried samples were same as controls.