Answered: Air entering dryer (0.042, G (kg/h))…

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

Cereal is being dried in a dryer by air flowing countercurrent to the cereal (sec flowchart below). To minimize breakage of the cereal flakes, a portion of the exit air from the dryer is recycled. The moisture content (mass fraction) of the various streams is as follows: Fresh air = 0.0082, wet cereal = 0.200, dried cereal = 0.050, air entering dryer = 0.042, and exit air = 0.181. Take as a basis 1000 kg/h of wet cereal entering the dryer and assume steady state. What is the flow rate (F in kg/h) of the fresh air, and that of the recycle stream (R in kg/h)? Write enough independent equations (neither more, nor less) that, if solved, they will provide F and R.

Air entering dryer
(0.042, G (kg/h))
Recycle, R(kg/h)
Exit air (0.181,
E(kg/h))
Fresh air,
(0.0082, F(kg/h))
DRYER
Wet cereal (0.200,
1000 kg/h)
Dried cereal
(0.05, D(kg/h))

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