Answered: Equilibrium-Moisture Content % relative…

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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Question

A tunnel dryer is to be designed to dry, by crossflow with air, a wet solid that will be placed in trays measuring 1.5 m longx1.2 m widex25 cm deep. Drying will be from both sides. The initial total moisture content is 116% (dry basis) and the desired final average moisture content is 10% (dry basis). Air is at 90^oF and 1 atm with a relative humidity of 15%. The laboratory data below were obtained under the same conditions: Determine the time needed to dry the solid from 110% to 10% moisture content (dry basis) if the air conditions are changed to 125^oF and 20% relative humidity. Assume the critical moisture content will not change and that the drying rate is proportional to the difference between dry- and wet-bulb air temperatures.

Equilibrium-Moisture Content
% relative
10
20
30
40
50
60
70
90
humidity
Moisture content,
3.0 3.2 4.1
4.8
5.4
6.1
7.2 10.7
% (dry basis)
Drying Test
Drying Test
Moisture content,
Moisture content,
Time, min
% (dry basis)
Time, min
% (dry basis)
116
362
31.4
36
106
415
28.6
125
81
465
24.8
194
61.8
506
22.8
211
57.4
601
15.4
242
49.6
635
13.5
277
12.8
785
11.4
313
37.1
822
10.2

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