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A dryer is used to process 2000 kg/h of a material containing 40% moisture to a final product containing 5% moisture. The dryer consists of an air heater and a drying chamber. To save energy in air heating, part of the exhaust air is recycled, mixed with fresh air, and the resulting mixture is heated before feeding to the chamber. 30,000 m³ of fresh air per hour at 30°C dry bulb temperature and 65% RH are used. This is mixed with the recycled air and heated to 100°C dry bulb temperature and 42°C wet bulb temperature. The exhaust air is at 60°C. Calculate: a) the molal and absolute humidity of the exhaust air b) the fraction of the exhaust air that is recycled

A dryer is used to process 2000 kg/h of a material containing 40% moisture to a final product containing 5% moisture. The dryer consists of an air heater and a drying chamber. To save energy in air heating, part of the exhaust air is recycled, mixed with fresh air, and the resulting mixture is heated before feeding to the chamber. 30,000 m³ of fresh air per hour at 30°C dry bulb temperature and 65% RH are used. This is mixed with the recycled air and heated to 100°C dry bulb temperature and 42°C wet bulb temperature. The exhaust air is at 60°C. Calculate: a) the molal and absolute humidity of the exhaust air b) the fraction of the exhaust air that is recycled

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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A dryer is used to process 2000 kg/h of a material containing 40% moisture to a final product containing 5% moisture. The dryer consists of an air heater and a drying chamber. To save energy in air heating, part of the exhaust air is recycled, mixed with fresh air, and the resulting mixture is heated before feeding to the chamber. 30,000 m of fresh air per hour at 30°C dry bulb temperature and 65% RH are used. This is mixed with the recycled air and heated to 100°C dry bulb temperature and 42°C wet bulb temperature. The exhaust air is at 60°C. Calculate: a) the molal and absolute humidity of the exhaust air b) the fraction of the exhaust air that is recycled
Transcribed Image Text:A dryer is used to process 2000 kg/h of a material containing 40% moisture to a final product containing 5% moisture. The dryer consists of an air heater and a drying chamber. To save energy in air heating, part of the exhaust air is recycled, mixed with fresh air, and the resulting mixture is heated before feeding to the chamber. 30,000 m of fresh air per hour at 30°C dry bulb temperature and 65% RH are used. This is mixed with the recycled air and heated to 100°C dry bulb temperature and 42°C wet bulb temperature. The exhaust air is at 60°C. Calculate: a) the molal and absolute humidity of the exhaust air b) the fraction of the exhaust air that is recycled
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