The diagram below shows a circuit consisting of 2 reverse osmosis units. There a

Question

The diagram below shows a circuit consisting of 2 reverse osmosis units. There are five streams whose total mass flowrates are given as A, B E. The mass fraction of salt in stream iis represented by Xi. Known values are written on the diagram. Unknown values are shown by Assume the system is operating at steady state with no reactions xc 0.18 DE 3 kg/h. A 100 kg/h xD 0.02 0.035 1 E 30 kg/h Question Completio Conduct a DOF analysis of this circuit and determine which of the following statements is correct: Circuit is underspecified (DOF 0) i e. more information is needed to determine all the unknown values. Number of unknowns number of independent equations (DOF o i.ee. a unique solution can be found for all unknowns Circuit is overspecified (DOF 0 i e. too much informationis provided and there may be inconsistencies. Circuit is not a linear problem. None of or more than one of the above.

Explanation / Answer

Degree of freedom analyses are similar for recycle systems to those for other systems, but with a couple important points that the engineer must keep in mind:

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