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16.5. A 100 kg batch of granular solıds containing 30 per cent of moisture is to be dried in a tray dryer to 15.5 pcr cent of moisture by passing a current of air at 350 K tangentially across its surface at the velocity of 1.8 m/s. If the constant rate of drying under these conditions is 0.7 g/s m- and the critical moisture content is per cent, calculate the approximate drying time. It may be assumed that the area of the drying surface is 0.03 m-/kg dry mass. 15

16.5. A 100 kg batch of granular solıds containing 30 per cent of moisture is to be dried in a tray dryer to 15.5 pcr cent of moisture by passing a current of air at 350 K tangentially across its surface at the velocity of 1.8 m/s. If the constant rate of drying under these conditions is 0.7 g/s m- and the critical moisture content is per cent, calculate the approximate drying time. It may be assumed that the area of the drying surface is 0.03 m-/kg dry mass. 15

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
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16.5
PROBLEMS 1181 16.5. A 100 kg batch of granular solıds containing 30 per cent of moisture is to be dried in a tray dryer to per cent of mnoisture by passing a current of air at 350 K tangentially across its surface at the vclocity of 1.8 m/s. If the constant rate of drying under these conditions is 0.7 g/s m- and the critical moisture content is 15 per cent, calculate the approximate drying time. It may be assumed that the area of the drying surface is 0.03 m-/kg dry mass. 15.5 16.6. A flow of 0.35 kg/s of a solid is to be dried from 15 per cent to 0.5 per cent moisture based on a dry basis. The mean heat capacity of the solids is 2.2 kJ/kg deg K. It is proposed that a co-current adiabatic dryer should be uscd with the soliıds entering at 300 K and, because of the heat sensitive nature of the solids, leaving at 325 K. Hot air is available at 400 K with a humidity of 0.01 kg/kg dry air, and the maximum allowable mass velocity of the air 1s 0.95 kg/m-s. What diameter and length should be specified tor the proposed dryer? 16.7. 0.126 kg/s of a product containing 4 per cent water is produced in a dryer from a wet feed containing 42 per cent water on a wet basis. Ambient air at 294 K and 40 per cent relative humidity is heated to 366 K n a prehcater before entering the dryer which it leaves at 60 per cent relative humidity. Assuming that the dryer operates adiabatically. what is the amount of air supplied to the preheater and the heat required in the preheater? How will these values be affected if the air enters the dryer at 340K and sufticient heat is supplied within the dryer so that the air leaves also at 340 K and again with a relative humidity of 60 per cent! 16.8. A wct solid
Transcribed Image Text:PROBLEMS 1181 16.5. A 100 kg batch of granular solıds containing 30 per cent of moisture is to be dried in a tray dryer to per cent of mnoisture by passing a current of air at 350 K tangentially across its surface at the vclocity of 1.8 m/s. If the constant rate of drying under these conditions is 0.7 g/s m- and the critical moisture content is 15 per cent, calculate the approximate drying time. It may be assumed that the area of the drying surface is 0.03 m-/kg dry mass. 15.5 16.6. A flow of 0.35 kg/s of a solid is to be dried from 15 per cent to 0.5 per cent moisture based on a dry basis. The mean heat capacity of the solids is 2.2 kJ/kg deg K. It is proposed that a co-current adiabatic dryer should be uscd with the soliıds entering at 300 K and, because of the heat sensitive nature of the solids, leaving at 325 K. Hot air is available at 400 K with a humidity of 0.01 kg/kg dry air, and the maximum allowable mass velocity of the air 1s 0.95 kg/m-s. What diameter and length should be specified tor the proposed dryer? 16.7. 0.126 kg/s of a product containing 4 per cent water is produced in a dryer from a wet feed containing 42 per cent water on a wet basis. Ambient air at 294 K and 40 per cent relative humidity is heated to 366 K n a prehcater before entering the dryer which it leaves at 60 per cent relative humidity. Assuming that the dryer operates adiabatically. what is the amount of air supplied to the preheater and the heat required in the preheater? How will these values be affected if the air enters the dryer at 340K and sufticient heat is supplied within the dryer so that the air leaves also at 340 K and again with a relative humidity of 60 per cent! 16.8. A wct solid
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