Description of the control of a passive dehydrator and its effect on temperature regulation in the dehydration process of Stevia leaves (Stevia rebaudiana Bertoni)
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Stevia leaves (Stevia Rebaudiana Bertoni) have become important due to their high sweetening power, so their consumption has increased in recent years. The highest sweetener content is generally found in the dried leaves; allowing temperature contro become an important study parameter. The present research, explains the effect of the implementation of a closed loop control system implemented through Arduino technology and conventional electronics. Temperature regulation was analyzed with a PID (Proportional, Integral, Derivative Control) for a drawer type solar dehydrator. Through a graphical user interface (GUI) in Matlab, the dehydration process of Stevia (Stevia Rebaudiana Bertoni) was monitored through three different desired temperatures 30 ℃, 35 ℃ and 40 ℃. Finally, in the analysis of results, the effect of temperature on the dehydration process must be studied through the quantification of the percentage of its active substances present in the leaves using the L standard at 630 nanometers. The results showed that 35°C is the optimum temperature for the dehydration of Stevia leaves. On the other hand, the passive tyoe dehydration of temperature is a feasible option for its application in the dehydration of Stevia leaves.
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