Flash separator is a common unit operation system in chemical engineering. This technique utilizes the sudden drop in pressure of a stream at vapor$-$liquid equilibrium to separate vapor and liquid. In an application, Refrigerant $134$ a with quality $65\%$ at $10$ bar, enters a flash vessel at a rate of $490k\frac{g}{h}.$ Due to the sudden drop in the vessel, partial vaporization occurs, and separation of vapor and liquid is achieved. Hence, two outlet streams emerge from the vessel. The first outlet stream contains saturated vapor while the other outlet stream contains saturated liquid. Both outlet streams are at $4$ bar.

a$.$ Sketch the flash vessel described above. Label all the streams associated with the system

$(4$ marks$)$

b$.$ By making appropriate assumptions, calculate:

i$.$ The mass flowrate $(k\frac{g}{s})$ of liquid stream.

ii$.$ The mass flow rate $(k\frac{g}{s})$ of vapor stream.

$(8$ marks$)$