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24.3. A slab with a wet weight of 5 kg originally contains 50 percent moisture (wet basis). The slab is 600 by 900 by 75 mm thick. The equilibrium-moisture content is 5 percent of the total weight when in contact with air of 20°C and 20 percent humidity. The drying rate is given in Table 24.1 for contact with air of the above quality at a definite velocity. Drying is from one face. How long will it take to dry the slab to 15 percent moisture content (wet basis)? TABLE 24.1 Data for Prob. 24.3 Wet-slab weight, kg Drying rate, kg/m²-h 9.1 7.2 5.3 4.2 3.3 29 2.0 2.7 1.0 4.9 4.9 4.4 3.9 3.4

24.3. A slab with a wet weight of 5 kg originally contains 50 percent moisture (wet basis). The slab is 600 by 900 by 75 mm thick. The equilibrium-moisture content is 5 percent of the total weight when in contact with air of 20°C and 20 percent humidity. The drying rate is given in Table 24.1 for contact with air of the above quality at a definite velocity. Drying is from one face. How long will it take to dry the slab to 15 percent moisture content (wet basis)? TABLE 24.1 Data for Prob. 24.3 Wet-slab weight, kg Drying rate, kg/m²-h 9.1 7.2 5.3 4.2 3.3 29 2.0 2.7 1.0 4.9 4.9 4.4 3.9 3.4

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
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1-:07 ll VOLTE OMANTEL K/s Tutorial 2.pdf Question 1: 24.3. A slab with a wet weight of 5 kg originally contains 50 percent moisture (wet basis). The slab is 600 by 900 by 75 mm thick. The equilibrium-moisture content is 5 percent of the total weight when in contact with air of 20°C and 20 percent humidity. The drying rate is given in Table 24.1 for contact with air of the above quality at a definite velocity. Drying is from one face. How long will it take to dry the slab to 15 percent moisture content (wet basis)? TABLE 24.1 Data for Prob. 24.3 Wet-slab weight, kg Drying rate, kg/m²-h 9.1 7.2 5.3 4.2 3.3 2.9 2.0 2.7 4.9 4.9 4.4 3.9 3.4 1.0 Question 2: 24.4. A continuous countercurrent dryer is to be designed to dry 800 lb of wet porous solid per hour from 140 percent moisture to 20 percent, both on the dry basis. Air at 120°F dry bulb and 70°F wet bulb is to be used. The exit humidity is to be 0.012. The average equilibrium-moisture content is 5 percent of the dry weight. The total moisture content (dry basis) at the critical point is 40 percent. The stock may be assumed to remain at a temperature 3°F above that of the wet-bulb temperature of the air throughout the dryer. The heat-transfer coefficient is 12 Btu/ft?-h-°F. The area exposed to the air is 1.1 ft? per pound of dry solids. How long must the solids remain in the dryer? References: 1- Felder, R.M. & Rousseau, R.W., Elementary Principles of Chemical Processes, 3th edition, J. Wiley & Sons, New York, 2005. 2- Himmelblau, D, M, and Riggs, J, B. Basic Principles and Calculations in Chemical Engineering, 7th Edition, Prentice Hall, 2004
Transcribed Image Text:1-:07 ll VOLTE OMANTEL K/s Tutorial 2.pdf Question 1: 24.3. A slab with a wet weight of 5 kg originally contains 50 percent moisture (wet basis). The slab is 600 by 900 by 75 mm thick. The equilibrium-moisture content is 5 percent of the total weight when in contact with air of 20°C and 20 percent humidity. The drying rate is given in Table 24.1 for contact with air of the above quality at a definite velocity. Drying is from one face. How long will it take to dry the slab to 15 percent moisture content (wet basis)? TABLE 24.1 Data for Prob. 24.3 Wet-slab weight, kg Drying rate, kg/m²-h 9.1 7.2 5.3 4.2 3.3 2.9 2.0 2.7 4.9 4.9 4.4 3.9 3.4 1.0 Question 2: 24.4. A continuous countercurrent dryer is to be designed to dry 800 lb of wet porous solid per hour from 140 percent moisture to 20 percent, both on the dry basis. Air at 120°F dry bulb and 70°F wet bulb is to be used. The exit humidity is to be 0.012. The average equilibrium-moisture content is 5 percent of the dry weight. The total moisture content (dry basis) at the critical point is 40 percent. The stock may be assumed to remain at a temperature 3°F above that of the wet-bulb temperature of the air throughout the dryer. The heat-transfer coefficient is 12 Btu/ft?-h-°F. The area exposed to the air is 1.1 ft? per pound of dry solids. How long must the solids remain in the dryer? References: 1- Felder, R.M. & Rousseau, R.W., Elementary Principles of Chemical Processes, 3th edition, J. Wiley & Sons, New York, 2005. 2- Himmelblau, D, M, and Riggs, J, B. Basic Principles and Calculations in Chemical Engineering, 7th Edition, Prentice Hall, 2004
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