Answered: Paper is being dried with recirculating…

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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Paper is being dried with recirculating air in a two-stage drying system at 1 atm. Air enters the first dryer at 180^oF, where it is adiabatically saturated with moisture. The air is then reheated in a heat exchanger to 174^oF before entering the second dryer, where it is adiabatically humidified to 80% relative humidity. The air is then cooled to 60^oF in a second heat exchanger, causing some moisture to be condensed. This is followed by a third heater to heat the air to 180^oF before it returns to the first dryer. (a) Draw a process-flow diagram of the system and enter all of the given data. (b) Determine the lb H₂O evaporated in each dryer per lb of dry air being circulated. (c) Determine the lb H₂O condensed in the second heat exchanger per lb of dry air circulated

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