# In a thermostat control system for a home heating system

Chapter 1, Problem 1.9

(choose chapter or problem)

QUESTION:

In a thermostat control system for a home heating system (a) Identify the manipulated variable (b) Identify the controlled variable (c) How is a valve involved in the control system? What does it manipulate? (d) Name one important disturbance (it must change with respect to time).

QUESTION:

In a thermostat control system for a home heating system (a) Identify the manipulated variable (b) Identify the controlled variable (c) How is a valve involved in the control system? What does it manipulate? (d) Name one important disturbance (it must change with respect to time).

Step 1 of 3

To answer this question, we need to understand what are the three important process variables in a control problem:

1. Control Variable:

A control variable is the variable that is measured and controlled. This could be the desired temperature in a room or a level of water in a tank.

2.Manipulated Variable:

It is the variable which is adjusted or manipulated to keep the control variable at desired levels or at set point.

3. Disturbance variable: These are variables that affect the control variable, generally changes in environment could be called disturbance variable.