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The wet feed material to a continuous dryer contains 50 wt% water on a wet basis and is dried to 27 wt % by counter-current air flow. The dried product leaves at the rate of 662.25 kg dry solid/h. Fresh air to the system is at 25.6°C and has a humidity of H = 0.007 kg H20/kg dry air. The moist air leaves the drier at 37.8°C and H = 0.020 and part of it is recirculated and mixed with the fresh air before entering a heater. The heated mixed air enters the dryer at 65.6°C and H = 0.010. The solid enters at 26.7°C %3D %3D and leaves at 26.7°C. Calculate i. the flowrate of the fresh air ii. the percentage of the air leaving the dryer that is recycled

The wet feed material to a continuous dryer contains 50 wt% water on a wet basis and is dried to 27 wt % by counter-current air flow. The dried product leaves at the rate of 662.25 kg dry solid/h. Fresh air to the system is at 25.6°C and has a humidity of H = 0.007 kg H20/kg dry air. The moist air leaves the drier at 37.8°C and H = 0.020 and part of it is recirculated and mixed with the fresh air before entering a heater. The heated mixed air enters the dryer at 65.6°C and H = 0.010. The solid enters at 26.7°C %3D %3D and leaves at 26.7°C. Calculate i. the flowrate of the fresh air ii. the percentage of the air leaving the dryer 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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The wet feed material to a continuous dryer contains 50 wt% water on a wet basis and is dried to 27 wt % by counter-current air flow. The dried product leaves at the rate of 662.25 kg dry solid/h. Fresh air to the system is at 25.6°C and has a humidity of H = 0.007 kg H20/kg dry air. The moist air leaves the drier at 37.8°C and H = 0.020 and part of it is recirculated and mixed with the fresh air before entering a heater. The heated mixed air enters the dryer at 65.6°C and H = 0.010. The solid enters at 26.7°C %3D %3D and leaves at 26.7°C. Calculate i. the flowrate of the fresh air ii. the percentage of the air leaving the dryer that is recycled
Transcribed Image Text:The wet feed material to a continuous dryer contains 50 wt% water on a wet basis and is dried to 27 wt % by counter-current air flow. The dried product leaves at the rate of 662.25 kg dry solid/h. Fresh air to the system is at 25.6°C and has a humidity of H = 0.007 kg H20/kg dry air. The moist air leaves the drier at 37.8°C and H = 0.020 and part of it is recirculated and mixed with the fresh air before entering a heater. The heated mixed air enters the dryer at 65.6°C and H = 0.010. The solid enters at 26.7°C %3D %3D and leaves at 26.7°C. Calculate i. the flowrate of the fresh air ii. the percentage of the air leaving the dryer that is recycled
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