800 kg of a porous material containing 0.38 kg H2O/kg wet material is dried in a tray dryer such that 56% of the original moisture is removed in 7800 seconds. If the area of surface drying is 0.5 m2 /kg dry mass, how long will it take to dry the pellets from 0.22 kg H2O /kg dry mass to 0.08 kg H2O /kg dry mass moisture? Assume the surface area of drying is still the same. The critical moisture content of the material is 0.15 kg H2O /kg dry mass and the equilibrium moisture content is 0.05 kg H2O / kg dry mass. Hint: The first drying case occurs only in the constant rate period, while the
800 kg of a porous material containing 0.38 kg H2O/kg wet material is dried in a tray dryer such that 56% of the original moisture is removed in 7800 seconds. If the area of surface drying is 0.5 m2 /kg dry mass, how long will it take to dry the pellets from 0.22 kg H2O /kg dry mass to 0.08 kg H2O /kg dry mass moisture? Assume the surface area of drying is still the same. The critical moisture content of the material is 0.15 kg H2O /kg dry mass and the equilibrium moisture content is 0.05 kg H2O / kg dry mass. Hint: The first drying case occurs only in the constant rate period, while the
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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800 kg of a porous material containing 0.38 kg H2O/kg wet material is dried in a tray dryer such that 56%
of the original moisture is removed in 7800 seconds. If the area of surface drying is 0.5 m2
/kg dry mass,
how long will it take to dry the pellets from 0.22 kg H2O /kg dry mass to 0.08 kg H2O /kg dry mass moisture?
Assume the surface area of drying is still the same. The critical moisture content of the material is 0.15 kg
H2O /kg dry mass and the equilibrium moisture content is 0.05 kg H2O / kg dry mass.
Hint: The first drying case occurs only in the constant rate period, while the second case includes both
drying periods.
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