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A solution of sugar in water is to be concentrated from 5 wt% sugar to 20% sugar. The solution is at 45 ˚C when it is fed continuously to a bubble column. Air at 45 ˚C with a dew point of 4 ˚C is bubbled through the column and emerges saturated. The humidification of the air may be considered adiabatic. Using the psychrometric chart: a) What are the absolute humidities of the entering and exiting air? b) How many kilograms of air must be fed per kilogram of the entering sugar solution? What is the corresponding volume of the entering air? (Hint: assume the mass of the air stream remains approximately constant).

A solution of sugar in water is to be concentrated from 5 wt% sugar to 20% sugar. The solution is at 45 ˚C when it is fed continuously to a bubble column. Air at 45 ˚C with a dew point of 4 ˚C is bubbled through the column and emerges saturated. The humidification of the air may be considered adiabatic. Using the psychrometric chart: a) What are the absolute humidities of the entering and exiting air? b) How many kilograms of air must be fed per kilogram of the entering sugar solution? What is the corresponding volume of the entering air? (Hint: assume the mass of the air stream remains approximately constant).

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 solution of sugar in water is to be concentrated
from 5 wt% sugar to 20% sugar. The solution is at 45
˚C when it is fed continuously to a bubble column.
Air at 45 ˚C with a dew point of 4 ˚C is bubbled
through the column and emerges saturated. The
humidification of the air may be considered adiabatic.

Using the psychrometric chart:
a) What are the absolute humidities of the entering and exiting air?
b) How many kilograms of air must be fed per kilogram of the entering sugar solution? What is
the corresponding volume of the entering air? (Hint: assume the mass of the air stream remains
approximately constant).

-5 -10 52 02 10 15 Wet Bulb or Saturation Temperature, "C 10 0 +0.2 +04 0 30 +0.6 +0.8 st +1.0 35 40 3 10 0.75 0.80 Below 0°C Properties and Enthalpy Deviation Lines Are For Ice 40 15 53 500- Enthalpy At Saturation, kl/kg Dry Air 99 SL OL 59 09 55 05 St 20 OR -0.1 58 20 90 56 25 21 15 25 Dry Bulb Temperature, "C 100 105 110 115 30 120 306 509 SE 0.85 Humid Volume, m'/kg Dry Air 125 40% 3 90 30% 40 50% Relative Humidity 130 20% 40 -0.8 10% 135 45 45 1 0.90 -1.0 Enthalpy Deviation Kl/kg Dry Air 140 50 50 1.2 145 55. 0.033 0.032 0.031 0.030 0.029 -0.028 0.027 0.026 -0.025 -0.024 -0.023 0.022 0.021 -0.020 0.019 0.018 0.017 0.95 0.016 0.015 0.014 0.013 0.012 -0.011 0.010 -0.009 -0.008 0.007 0.006 0.005 0.004 -0.003 0.002 €0.001 -0.00 55 Moisture Content, kg/kg Dry Air
Transcribed Image Text:-5 -10 52 02 10 15 Wet Bulb or Saturation Temperature, "C 10 0 +0.2 +04 0 30 +0.6 +0.8 st +1.0 35 40 3 10 0.75 0.80 Below 0°C Properties and Enthalpy Deviation Lines Are For Ice 40 15 53 500- Enthalpy At Saturation, kl/kg Dry Air 99 SL OL 59 09 55 05 St 20 OR -0.1 58 20 90 56 25 21 15 25 Dry Bulb Temperature, "C 100 105 110 115 30 120 306 509 SE 0.85 Humid Volume, m'/kg Dry Air 125 40% 3 90 30% 40 50% Relative Humidity 130 20% 40 -0.8 10% 135 45 45 1 0.90 -1.0 Enthalpy Deviation Kl/kg Dry Air 140 50 50 1.2 145 55. 0.033 0.032 0.031 0.030 0.029 -0.028 0.027 0.026 -0.025 -0.024 -0.023 0.022 0.021 -0.020 0.019 0.018 0.017 0.95 0.016 0.015 0.014 0.013 0.012 -0.011 0.010 -0.009 -0.008 0.007 0.006 0.005 0.004 -0.003 0.002 €0.001 -0.00 55 Moisture Content, kg/kg Dry Air
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