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Processed cotton will be dried on a tray in a medium-sized dryer from 1 kg of dry water/kg to 0.1 kg of dry water/kg of humidity. Tests in a similar condition on a reduced scale in a wind tunnel indicated a critical humidity of 0.4 kg water/kg dry for the material in a 1 cm layer. It was also possible to detect that the drying rate in decreasing period would be approximately proportional to the free moisture of the solid. The dryer will maintain about 2500 Kg /(h m²_sol) in air flow on 60 x 60 cm trays, with material in a 1 cm layer. Thus, the bottom of the solid would not be exposed to the flowing air. The worst atmospheric conditions in the installation region indicate that the air heated to 75C for drying in the trays would be at a relative humidity of around 17%. In this condition, data from the literature indicate that the equilibrium with the drying air occurs at about 0.03 Kg water/Kg dry dry (you can check this in the equilibrium graph of the previous question). Under these air conditions and in "good ventilation", the wet bulb temperature would be 50C (you can check this on the psychrometric chart). It is estimated that dry cotton has about 0.7 g_solid/cm³ of material.

In view of the mentioned characteristics, you estimate that the drying time for the intended humidity will be __________ hours. When faced with drying time, the producer asks you to check an alternative to reduce drying time. You decide to use supports that have a metallic mesh on the base instead of the trays, allowing the cotton to contact the bottom as well. As a rough estimate, he decides to ignore the effects of the wires and calculate the drying time as if the cotton vine were suspended in the air. Thus, it estimates that drying will occur in __________ hours, ___________ % of the time it would take with only the top exposed to air.