Effect of Drying Temperature on Drying Rate Changes
The drying rates of SC using FIRD and AD at different tem- peratures were compared (Fig. 3a,b). The drying rates were calculated using Eqs. (3)–(5) based on the moisture ratio changes. The drying rate changes showed the prototypical behavior of a falling rate drying period for both FIRD and AD for all tested temperatures. A constant drying period was not observed for all treatments. Because the samples were already steamed and salted, the free water around the SC surface, which mainly contributes to the constant drying rate, was already removed before drying. Therefore, the falling rate drying period was observed even in the begin- ning. Many bioproducts show the same drying behavior that is reported in the present study. The dried layers of bio- products cannot provide a constant supply of water, so the drying rate may be dominated by moisture diffusion from the inside to the surface (Chua and Chou 2005; Doymaz 2007; Shi et al. 2008).
At the same temperature, the drying rate of FIRD was higher than that of AD. In addition, the drying rate increased with the increase in the drying temperature for both FIRD and AD. The drying rates of FIRD were approxi- mately 38.6, 29.3 and 27.1% higher than those of AD at 60, 70 and 80C, respectively. The drying rate can be increased by increasing the temperature, but doing so may shorten the drying period of SCs. However, the high drying temperature may degrade the SC quality by burning the bumps on the surface or the edge of the SC. Generally, the shape of the bumps on the SC surface is an important factor for grading the dried SC commercially. Therefore, the drying tempera- ture should be optimized in consideration of both the SC drying rate and quality.
Effect of Drying Temperature on Drying Rate Changes
The drying rates of SC using FIRD and AD at different tem- peratures were compared (Fig. 3a,b). The drying rates were calculated using Eqs. (3)–(5) based on the moisture ratio changes. The drying rate changes showed the prototypical behavior of a falling rate drying period for both FIRD and AD for all tested temperatures. A constant drying period was not observed for all treatments. Because the samples were already steamed and salted, the free water around the SC surface, which mainly contributes to the constant drying rate, was already removed before drying. Therefore, the falling rate drying period was observed even in the begin- ning. Many bioproducts show the same drying behavior that is reported in the present study. The dried layers of bio- products cannot provide a constant supply of water, so the drying rate may be dominated by moisture diffusion from the inside to the surface (Chua and Chou 2005; Doymaz 2007; Shi et al. 2008).
At the same temperature, the drying rate of FIRD was higher than that of AD. In addition, the drying rate increased with the increase in the drying temperature for both FIRD and AD. The drying rates of FIRD were approxi- mately 38.6, 29.3 and 27.1% higher than those of AD at 60, 70 and 80C, respectively. The drying rate can be increased by increasing the temperature, but doing so may shorten the drying period of SCs. However, the high drying temperature may degrade the SC quality by burning the bumps on the surface or the edge of the SC. Generally, the shape of the bumps on the SC surface is an important factor for grading the dried SC commercially. Therefore, the drying tempera- ture should be optimized in consideration of both the SC drying rate and quality.
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