Controlled, manipulated, and disturbance variables in the given figure are to be identified. Also, the effect of time length required on the waste concentration in the dialysis treatment is to be explained. Concept introduction: A control system is a system that regulates or monitors the behavior or working of other devices/systems using control loops. It can be used to control a single device or large industrial processes. Controlled variables (CVs) are the process variables that can be controlled, and its desired value is known as the set point. Manipulated variables (MVs) are the process variables that are adjusted by the controller to keep its value close to the set point. Disturbance variables (DVs) are the process variable that affects the controlled variables, but they cannot be manipulated and are associated with any changes in the operating environment of the ongoing process.

Question

Figure below shows a portion of a fire protection system in which apump draws water at 60 F from a reservoir and delivers it to point B at the flow rate of 1500 gal/min a). Calculate the required height of the water level in the tank in order to maintain 5.0 psig pressure at point A. Answer: h = 12,6 ft b). Assuming that the pressure at A is 5.0 psig, calculate the power delivered by the pump to the water in order to maintain the pressure at point B at 85 kPa. Include energy lost due to friction but neglect any other energy losses. P₁ =19,2 hp

Answer 1

Question

Chapter 1, Problem 1.12E

Interpretation Introduction

Interpretation:

Controlled, manipulated, and disturbance variables in the given figure are to be identified. Also, the effect of time length required on the waste concentration in the dialysis treatment is to be explained.

Concept introduction:

A control system is a system that regulates or monitors the behavior or working of other devices/systems using control loops. It can be used to control a single device or large industrial processes.

Controlled variables (CVs) are the process variables that can be controlled, and its desired value is known as the set point.

Manipulated variables (MVs) are the process variables that are adjusted by the controller to keep its value close to the set point.

Disturbance variables (DVs) are the process variable that affects the controlled variables, but they cannot be manipulated and are associated with any changes in the operating environment of the ongoing process.

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