this is process control and instrument question.. please answer all by showing w

Question

this is process control and instrument question.. please answer all by showing working step calculation.. thanks

Question 4 (20 marks) Define the variables in the system in Figure 1 that constitutes the process load. (a) (4 marks) 0s Control valve Controller Measurement Output Setpoint Figure 1 () Analyze each of the following control systems and determine whether they have self-regulation, what the process load would be and whether a process lag would be expected. Air-condition system (3 marks)

Explanation / Answer

This is the simple problem based on Process Dynamic and Cotrol . For help in such kind of problems you can also take Mechaical Measuremet and Control book by Surekha Bhanot.

a)

Control Variable: Tl(Temperature of the liquid)

Manipulated Variable:Qs(Inflow of steam)

Disturbances:Qa , Qb, Ta

b)

In Air conditioned system :

It will be self-regulated because to mantain the temperature it must have temperature sensing hence it become self regulated .

Now, Load Variable here is the temperature which needs to be mantained .

For a water level control system as shwon in figure 2 .

The load variable (control ) is the liquid level .

Since the controller take feedback and then give signal to control valve opening .

Hence , there is a time lag in the system .

c)

Start - Platform moves to down

Now , control action required to move it up are

START -> STOP -> UP

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