1000 kg/h of Seawater containing 3.5 wt% salt and the balance water passes through a series of 3 evaporators. In each evaporator, 90% of the entering water is vaporized. The salt and remaining liquid water is fed to the next evaporator in series. The vapor streams from each evaporator are condensed and combined to obtain a product stream of pure water. The liquid outlet stream from the final evaporator in series is called the brine.
a. Draw and label the flow chart for this process. Use variable notation to label the amount and composition of each flow stream.
b. Carry out a DOF analysis on each subsystem based on your flowchart.
c. What is the mass flowrate of the pure water product stream in kg/h?
d. What is the mass flowrate of the brine product stream in kg/h?
e. What is the composition of the brine product stream in wt%?