A single effect evaporator is used to concentrate fruit juice from $$ 5 \% $$ to $$ 20 \% $$ solids. The diluted juice is fed into the evaporator at a temperature of $$ 25 \% \mathrm{C} $$ and a mass flow rate of $$ \angle 720 \mathrm{~kg} / \mathrm{h} $$. a) Draw a process flow diagram for the evaporator. D) Caiculate the mass flow rate in $$ \mathrm{kg} / \mathrm{h} $$ of concentrated juice and vapour. c) Siven that the sleam used is $$ 4300 \mathrm{~kg} / \mathrm{h} $$, calculate the steam economy of the system.

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a) Process flow diagram: Steam input (heating) -> Evaporator -> Concentrated juice output -> Vapor output b) Mass flow rate of concentrated juice: 180 kg/h, vapor: 540 kg/h c) Steam economy: 0.1256 (or 12.56%)

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