Tomato Dehydration in a Hybrid-Solar Dryer
|Reyes A*, Mahn A, Huenulaf P and González T|
|Department of Chemical Engineering, University of Santiago of Chile, Av. L. B. O”Higgins 3363, Santiago, Chile|
|Corresponding Author :||Reyes A
Department of Chemical Engineering
University of Santiago of Chile
Av. L. B. O”Higgins 3363, Santiago, Chile
E-mail: [email protected]
|Received May 05, 2014; Accepted May 31, 2014; Published June 02, 2014|
|Citation: Reyes A, Mahn A, Huenulaf P, González T (2014) Tomato Dehydration in a Hybrid-Solar Dryer. J Chem Eng Process Technol 5:196. doi: 10.4172/2157-7048.1000196|
|Copyright: © 2014 Reyes A, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.|
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Tomato pieces were dehydrated in a hybrid solar dryer provided with a 3 m2 solar panel and electric resistances. At the outlet of the tray dryer 80 or 90% of the air was recycled and the air temperature was adjusted 50 or 60ºC. At the outlet of the solar panel the air temperature raised between 5 and 18°C above the ambient temperature.
Temperature and sample size significantly affected critical moisture content. The color parameters of dehydrated tomato indicate a notorious redness. Rehydration was achieved in less than 50 minutes.
Drying kinetics was adequately adjusted with three empirical models. Sorption isotherms adjusted soundly well with the Guggenheim-Anderson-de Boer and Peleg models. The solar energy input resulted in 6.6-12.5% energy saving.