Drying of a food product is carried out in an insulated tray. The drying air has a partial pressure of water equal to 2360 Pa and a wet bulb temperature of 3°C. The product has a drying surface of 0.05 m² /kg dry solid. The material has a critical moisture content of 0.12 (dry basis) and negligible equilibrium moisture content. The drying rate in the falling rate period is proportional to the moisture content and the mass transfer coefficient is 5.34 x 10-4 kg/m².hr.Pa. Calculate: (a) the drying rate in the constant iate period in kg/m² hr (b) the time required to dry the material from a moisture of 0 22 to 0.06 (both on dry basis). Vapor pressure of water at 30°C = 4232 Pa.
Drying of a food product is carried out in an insulated tray. The drying air has a partial pressure of water equal to 2360 Pa and a wet bulb temperature of 3°C. The product has a drying surface of 0.05 m² /kg dry solid. The material has a critical moisture content of 0.12 (dry basis) and negligible equilibrium moisture content. The drying rate in the falling rate period is proportional to the moisture content and the mass transfer coefficient is 5.34 x 10-4 kg/m².hr.Pa. Calculate: (a) the drying rate in the constant iate period in kg/m² hr (b) the time required to dry the material from a moisture of 0 22 to 0.06 (both on dry basis). Vapor pressure of water at 30°C = 4232 Pa.
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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Transcribed Image Text:Drying of a food product is carried out in an insulated tray. The drying air has a partial
pressure of water equal to 2360 Pa and a wet bulb temperature of 30°C. The product has a
drying surface of 0.05 m² /kg dry solid. The material has a critical moisture content of 0.12
(dry basis) and negligible equilibrium moisture content. The drying rate in the falling rate
period is proportional to the moisture content and the mass transfer coefficient is 5.34×10-4
kg/m².hr.Pa.
Calculate:
(a) the drying rate in the constant tate period in kg/m² hr
(b) the time required to dry the material from a moisture of 0 22 to 0.06 (both on dry
basis).
Vapor pressure of water at 30°C = 4232 Pa.
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