Unit Operations of Chemical Engineering
7th Edition
ISBN: 9780072848236
Author: Warren McCabe, Julian C. Smith, Peter Harriott
Publisher: McGraw-Hill Companies, The
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Chapter 1, Problem 1.9P
Interpretation Introduction
Interpretation: The dimensionless group for the relation is to be determined by comparing the dimensions on both the sides of the equation.
Concept introduction: The dimensional consistency is a method to check whether the particular formulae or equation is valid. It doesn’t mean that the formula or equation is correct; it only states that it is dimensionally valid and can perform the arithmetic operations.
There are 3 basic symbols into which all the symbols or quantities can be expressed. These are Mass (kg), Length (m) and time (s) and corresponding symbols are M, L and T respectively.
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9.4. A PID temperature controller is at steady state with an output pressure of 9 psig. The set
point and process temperature are initially the same. At time = 0, the set point is increased
at the rate of 0.5°F/min. The motion of the set point is in the direction of lower temperatures.
If the current settings are
PART 3 LINEAR CLOSED-LOOP SYSTEMS
Ke
=
2 psig/°F
Ti =
1.25 min
TD = 0.4 min
plot the output pressure versus time.
9.6. A PI controller has the transfer function
Determine the values of K, and T.
5s + 10
Ge
S
9.5. The input & to a PI controller is shown in Fig. P9-5. Plot the output of the controller if
Ke 2 and 0.50 min.
-
E
0.5
0
-0.5
0
FIGURE P9-5
2
4
t, min
Chapter 1 Solutions
Unit Operations of Chemical Engineering
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