Question: It is desired to control the composition and the level of the mixing tank used toIt is desired to control the composition and the level

It is desired to control the composition and the level of the mixing tank used toIt is desired to control the composition and the level of the mixing tank used to prepare a saline solution

at the nominal value by two PID controllers. There are

2

inlet streams entering the mixing tank. Density

of the mixture can be assumed constant through out the mixing process. The dilute inlet stream has a

constant composition of

10 w t %

with a nominal flowrate of

5 k \frac{g}{m} i n .

The other concentrated stream

has a constant composition which is

80 %

and has a nominal stream flowrate of

4 k \frac{g}{m} i n .

It is desired

to keep the level of the cylindrical mixing tank with a crosssectional area of

1 m^{2}

3 m .

prepare a saline solution at the nominal value by two PID controllers. There are

2

inlet streams entering the mixing tank. Density of the mixture can be assumed constant through out the mixing process. The dilute inlet stream has a constant composition of

10

%

with a nominal flowrate of

5

/

min

.

The other concentrated stream has a constant composition which is

80 %

and has a nominal stream flowrate of

4

/

min

.

It is desired to keep the level of the cylindrical mixing tank with a crosssectional area of

1

2

3

.

It is desired to control the composition and the level of

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