
This paper presents the results of convective drying of ginger rhizomes under blanched, unblanched, peeled and unpeeled conditions using the ars-0680 environmental chambers for the drying process and td1002a—linear heat conduction experimental equipment to measure the thermal conductivities of the ginger at six temperature levels ranging from 10 to 60 °C and drying times of 2 and 24 h. The drying curves were drawn using the moisture and conductivity data. The drying rate at higher drying times (24 h) was 0.889/°C and 0.4437/°C for 2 h-drying, giving 50% in moisture reduction rate. Whereas the initial moisture content was 95.12%, it reduced to 59.33% for the 24 h-drying time. The result of this study shows that the lowest moisture content (5.98%) was obtained for unpeeled ginger while the highest was the blanched (9.04%) all for 24 h-drying and at 60 °C. The average moisture content for 2 h drying at 60 °C was 70.6% while for 24 h drying; it was an average of 7.55%. Which is close to the target of 4–7% desired for this research. Though our results made our target, they are in line with the literature results that recommend moisture content of 7–12%. These show the superiority of higher temperature drying and the use of the convective drying method. The thermal conductivity for 24 h-dried ginger at 60 °C approximates to the thermal conductivity of dried ginger and it is 0.050 W/mK on the average. The unpeeled ginger gave the lowest value of 0.046 W/mK while the unblanched ginger gave the highest value of 0.055 W/mK. For 2 h of drying, the average value was 0.079 W/mK while the unblancehd ginger gave the lowest (0.076 W/mK) while the blanched the highest (0.084 W/mK).
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