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Comparativa de Cinéticas de un secador tipo gabinete y un secador acoplado con vacío

El secado solar es un procedimiento que busca conservar la calidad de los productos alimenticios por más tiempo. Para algunos productos se busca disminuir las temperaturas y el tiempo de secado para preservar sus características nutrimentales y/o farmacológicas. Al acoplar un sistema de vacío al secador solar tipo gabinete se reduce la temperatura de ebullición, el tiempo de proceso y permite deshidratar materiales que se degradan o modifican con temperaturas cercanas a los 100°C, además se eliminan gases que dificultan la transferencia de calor y gases químicamente activos que pueden oxidar el sustrato a secar. En el presente trabajo se presenta la comparativa de las cinéticas de secado de orégano en un secador solar tipo gabinete y un secador solar acoplado con vacío. Las pruebas de secado se hicieron con una muestra de 20g durante un tiempo de 90 minutos. Para el secador solar con vacío la máxima dentro del gabinete fue de 53.3°C y la humedad libre del producto final fue de 1.327gH2O/gss. Para el secado con vacío la velocidad de secado inicia muy lento, llega a un máximo de 0.1246 gH2O/gssmin y empieza a decrecer. Para el caso del secado sin vacío la temperatura máxima fue de 55.663°C, la humedad libre del producto final fue de 1.876gH2O/gss y la velocidad de secado tuvo un decaimiento constante. Los modelos que mejor se ajustan son el Two-term para el secado con vacío y modelo Newton para el secado sin vacío.


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