A 25 wt% solution of coffee in water at 70oF is spray-dried to a moisture content of 5% (dry basis) with air entering at 450oF and 1 atm with a humidity of 0.01 lb/lb (dry basis) and exiting at 200oF. Assuming the specific heat of coffee=0.3 Btu/lb-oF, calculate: (a) air rate in lb dry air/lb coffee solution; (b) temperature of evaporation; (c) heat-transfer rate in Btu/lb coffee solution

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
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A 25 wt% solution of coffee in water at 70oF is spray-dried to a moisture content of 5% (dry basis) with air entering at 450oF and 1 atm with a humidity of 0.01 lb/lb (dry basis) and exiting at 200oF. Assuming the specific heat of coffee=0.3 Btu/lb-oF, calculate: (a) air rate in lb dry air/lb coffee solution; (b) temperature of evaporation; (c) heat-transfer rate in Btu/lb coffee solution

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