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Example 3:- A sample of porous sheet material of mineral origin is dried from both sides by cross circulation of air in a laboratory drier. The sample was 3 m² and 6mm thick and edges were sealed. The air velocity is 3 m/s. DBT and WBT of air were 52°C and 21°C respectively. There was no radiation effect. Constant rate drying was 7.5 x 105 kg/s until critical moisture content of 15% (on wet basis) was obtained. In the falling rate period, rate of drying fell linearly with moisture content until the sample was dry. The dry weight of the sheet was 1.8 kg. Estimate the time needed for drying similar sheets 1.2 mx1.2 m x12 mm thick from both sides from 25% to 2% moisture on wet basis using air at a DBT of 66°C but of the same absolute humidity and a linear velocity of 5 m/s. Assume the critical moisture content remains the same.

Example 3:- A sample of porous sheet material of mineral origin is dried from both sides by cross circulation of air in a laboratory drier. The sample was 3 m² and 6mm thick and edges were sealed. The air velocity is 3 m/s. DBT and WBT of air were 52°C and 21°C respectively. There was no radiation effect. Constant rate drying was 7.5 x 105 kg/s until critical moisture content of 15% (on wet basis) was obtained. In the falling rate period, rate of drying fell linearly with moisture content until the sample was dry. The dry weight of the sheet was 1.8 kg. Estimate the time needed for drying similar sheets 1.2 mx1.2 m x12 mm thick from both sides from 25% to 2% moisture on wet basis using air at a DBT of 66°C but of the same absolute humidity and a linear velocity of 5 m/s. Assume the critical moisture content remains the same.

Introduction to Chemical Engineering Thermodynamics
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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Example 3:- A sample of porous sheet material of mineral origin is dried from both sides by cross circulation of air in a laboratory drier. The sample was 3 m² and 6mm thick and edges were sealed. The air velocity is 3 m/s. DBT and WBT of air were 52°C and 21°C respectively. There was no radiation effect. Constant rate drying was 7.5 x 105 kg/s until critical moisture content of 15% (on wet basis) was obtained. In the falling rate period, rate of drying fell linearly with moisture content until the sample was dry. The dry weight of the sheet was 1.8 kg. Estimate the time needed for drying similar sheets 1.2 mx1.2 m x12 mm thick from both sides from 25% to 2% moisture on wet basis using air at a DBT of 66°C but of the same absolute humidity and a linear velocity of 5 m/s. Assume the critical moisture content remains the same.
Transcribed Image Text:Example 3:- A sample of porous sheet material of mineral origin is dried from both sides by cross circulation of air in a laboratory drier. The sample was 3 m² and 6mm thick and edges were sealed. The air velocity is 3 m/s. DBT and WBT of air were 52°C and 21°C respectively. There was no radiation effect. Constant rate drying was 7.5 x 105 kg/s until critical moisture content of 15% (on wet basis) was obtained. In the falling rate period, rate of drying fell linearly with moisture content until the sample was dry. The dry weight of the sheet was 1.8 kg. Estimate the time needed for drying similar sheets 1.2 mx1.2 m x12 mm thick from both sides from 25% to 2% moisture on wet basis using air at a DBT of 66°C but of the same absolute humidity and a linear velocity of 5 m/s. Assume the critical moisture content remains the same.
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