A fruit juice at 20°C with 5% total solids is being concentratedin a single-effect evaporator. The evaporator is being operatedat a suffi cient vacuum to allow the product moisture to evaporate at 80°C, and steam with 85% quality is being supplied at 169.06 kPa. The desired concentration of thefi nal product is 40% total solids. The concentrated productexits the evaporator at a rate of 3000kg/h. Calculate the(a) steam requirements and (b) steam economy for theprocess, when condensate is released at 90°C. The specifi cheat of liquid feed is 4.05kJ/(kg°C), and of concentratedproduct is 3.175kJ/(kg°C). A single-effect evaporator is being used to concentrate10,000 kg/h of tomato juice from 5% total solids to 30% totalsolids. The juice enters the evaporator at 15°C. The evaporatoris operated with steam (80% quality) at 143.27 kPa. Thevacuum inside the evaporator allows the juice to boil at 75°C.Calculate (a) the steam requirements and (b) steam economyfor the process. Assume the condensate is discharged at 75°C.The specifi c heat of the liquid feed is 4.1 kJ/(kg°C) and theconcentrated product is 3.1 kJ/(kg°C).
A fruit juice at 20°C with 5% total solids is being concentrated
in a single-effect evaporator. The evaporator is being operated
at a suffi cient vacuum to allow the product moisture to evaporate at 80°C, and steam with 85% quality is being supplied at 169.06 kPa. The desired concentration of the
fi nal product is 40% total solids. The concentrated product
exits the evaporator at a rate of 3000kg/h. Calculate the
(a) steam requirements and (b) steam economy for the
process, when condensate is released at 90°C. The specifi c
heat of liquid feed is 4.05kJ/(kg°C), and of concentrated
product is 3.175kJ/(kg°C).
A single-effect evaporator is being used to concentrate
10,000 kg/h of tomato juice from 5% total solids to 30% total
solids. The juice enters the evaporator at 15°C. The evaporator
is operated with steam (80% quality) at 143.27 kPa. The
vacuum inside the evaporator allows the juice to boil at 75°C.
Calculate (a) the steam requirements and (b) steam economy
for the process. Assume the condensate is discharged at 75°C.
The specifi c heat of the liquid feed is 4.1 kJ/(kg°C) and the
concentrated product is 3.1 kJ/(kg°C).
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