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PROBLEM SET IN SINGLE EFFECT EVAPORATION
Group #
Prob Set on Single Effect Evap
Group 1
Problem 1
Problem 9
Prob17
Prob5
Prob13
Prob8
Group 2
Problem 2
Problem 10
Prob18
Prob6
Prob14
Prob7
Group 3
Problem 3
Problem 11
Prob19
Prob7
Prob15
Prob6
Group 4
Problem 4
Problem 12
Prob20
Prob8
Prob16
Prob5
Group 5
Problem 5
Problem 13
Prob1
Prob9
Prob17
Prob4
Group 6
Problem 6
Problem 14
Prob2
Prob10
Prob18
Prob3
Group 7
Problem 7
Problem 15
Prob3
Prob11
Prob19
Prob2
Group 8
Problem 8
Problem 16
Prob4
Prob12
Prob20
Prob1
8.4-1/554 and 8.4-2/554 Geankoplis
8.4-4/555 Geankoplis
8.4-10/555 Geankoplis
8.4-11/555 Geankoplis
Apple juice is being concentrated in a natural circulation single effect evaporator. At steady state conditions, dilute juice is the feed introduced at a rate of 7 kg/s. The concentration of the dilute juice is 10% total solids. The juice is concentrated to 50% total solids. Steam is available at 205 kPa and evaporation takes place at 13.5 kPa. The specific heat of dilute apple juice is 3.76 kJ/kg. The inlet feed temperature is 21oC and the condensate leaves the heating space at 79.7oC . The overall heat transfer coefficient is assumed to be 3000 W/m2K. Assume negligible boiling point elevation. Calculate:
mass flow rate of concentrated product
steam requirements
steam economy heat transfer area
5 MT/hr of an aqueous solution with 10% sugar will be concentrated to 50% in a single evaporator system operating at 694 mm Hg vacuum. Superheated steam at 150oC will condense at 120oC without subcooling in the steam chest. Assume that the feed has a specific heat of 3.5 kJ/kg-K, and the evaporator has an over-all coefficient of 2500 W/m2-K. Determine the steam requirement, economy and heat transfer area needed for the evaporator if the feed enters at 70oC?
A Single Effect evaporator was used to concentrate sugar solution from 15% to 60% solids. Steam is available at a temperature of 280oC and a pressure of 560 kPa. After the evaporation process, the steam finally condenses at 80oC. The temperature of the entering feed is 60oC and a specific heat capacity of 2.15 kJ/kg-K with a throughput rate of 1800 kg/hr. The pressure recorded at the vapor space reads at 200 kPa and the overall heat transfer coefficient is taken as 500 W/ m2 -K. Determine the following: (a) the capacity of the evaporator (b) the economy (c) the area of the evaporator.
8.4-7/555 Geankoplis
8.4-9/555 Geankoplis
A single effect evaporator is used to concentrate KCl solution from 10% to 40% solids. The feed enters at 25°C and steam at 180°C. The vapor space is maintained at 54°C. The over-all heat transfer coefficient is 3000W/m2-K. Cp is constant at 4.187 KJ/kg-K. The evaporation rate is 1000 kg/hr. Determine:
heat transfer area
economy
A single effect evaporator is used to concentrate NaCl solution from 10% to 35% solids. The feed enters at 250C and steam at 1800C. Vapor space is maintained at 540C. Over-all heat transfer coefficient is 3000 W/m2K. Cp is constant at 4 KJ/kg K. The throughput rate is 1000 kg/hr. Determine its
Heat transfer area
Economy
A single effect evaporator is used to concentrate 10,000 lb/hr of a 20% solution of NaOH solution to 40% solids. The pressure of saturated steam used is 172.4 kPa and the vapor space is to be 11.7 kPa. The overall coefficient is estimated to be 274 BTU/ft2 hr °F. The feed temperature is 140 °F. Calculate (a) the amount of steam consumed; (b) the steam economy and(c) the heating surface area
A single effect evaporator is used to concentrate LiCl solution from 15% to 40% solids. The feed enters at 25oC and steam at 180oC. Its vapor space is maintained at 54oC. Over-all heat transfer coefficient is 3000W/m2-K. Cp is constant at 4.187 KJ/Kg-K. The feed rate is 1000Kg/hr. Determine its: a) heat transfer area, and b) economy.
A single effect evaporator is used to concentrate 1000 kg/hr of a 20% solution of NaOH solution to 40% solids. Saturated steam used is at 180oC and the vapor space is at 30oC. The overall coefficient is estimated to be 5000 W/m2K. The feed temperature is 25oC. Calculate: (a) the amount of steam consumed (b) the steam economy and (c) the heating surface area.
A single effect evaporator is used to concentrate KCl solution from 10% to 40% solids. The feed enters at 25°C and steam at 180°C. The vapor space is maintained at 54°C. The over-all heat transfer coefficient is 3000W/m2-K. Cp is constant at 4.187 KJ/kg-K. The throughput rate is 1000 kg/hr. Determine:
heat transfer area
economy
A single effect evaporator is used to concentrate NaCl solution from 10% to 35% solids. The feed enters at 250C and steam at 1800C. Vapor space is maintained at 540C. Over-all heat transfer coefficient is 3000 W/m2K. Cp is constant at 4 KJ/kg K. Determine its feed rate if the heat transfer area is 10 m2. Find the economy
A single effect evaporator is used to concentrate 1000 kg/hr of a 20% solution of NaOH solution to 40% solids. The pressure of saturated steam used is 172.4 kPa and the vapor space is to be 11.7 kPa. The overall coefficient is estimated to be 1400 W.m2K. The feed temperature is 45 °C. Calculate (a) the amount of steam consumed; (b) the steam economy and(c) the heating surface area
A single effect evaporator is used to concentrate LiCl solution from 15% to 40% solids. The feed enters at 25oC and steam at 180oC. Its vapor space is maintained at 54oC. Over-all heat transfer coefficient is 3000W/m2-K. Cp is constant at 4.187 KJ/Kg-K. The thick liquor rate is 1000Kg/hr. Determine its: a) heat transfer area, and b) economy.
A single effect evaporator is used to concentrate 1000 kg/hr of a 20% solution of NaOH solution to 40% solids. Saturated steam used is at 180oC with the condensate leaving at 150oC; the vapor space is at 30oC. The overall coefficient is estimated to be 5000 W/m2K. The feed temperature is 25oC. Calculate: (a) the amount of steam consumed (b) the steam economy and (c) the heating surface area.
Suppose we are trying to concentrate a solution of orange juice from 10 wt% solids to 50 wt% in a long-tube vertical evaporator. Our past experience has shown that a reasonable heat transfer coefficient is 500 BTU/hr-ft2-oF. To keep the boiling temperature low enough, we keep the vapor space at 4-inches Hg vacuum. If the area of the evaporator is 700 ft2, what feed rate in lb/hr is required?
