Workshop for Flipped Class

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Workshop for Flipped Class Based on students having completed the Chapter 4 e-Lesson before class Chapter 4 Part I Modeling and Analysis for Process Control Copyright © Thomas Marlin 2016

Workshop 4. Product composition dynamics CHAPTER 4: MODELING AND ANALYSIS FOR PC Workshop 4. Product composition dynamics Let’s consider the CSTR initially operating at steady-state in Example 3.2. Then, a step is introduced in to the feed composition. Determine the concentration of the PRODUCT (CB) in the CSTR as a function of time. F CA0 V CA CB CB ?

Workshop 8. Determining a pipe dead time CHAPTER 4: MODELING AND ANALYSIS FOR PC Workshop 8. Determining a pipe dead time Engineers would like to know values of dead time in their process plants. A major contribution to dead time can be pipes. Develop a method for determining (calculating) the dead time for turbulent flow through a pipe that can be performed using commonly measured variables. Develop an experimental method for determining dead time from empirical data.

Workshop 9. First order with Dead time CHAPTER 4: MODELING AND ANALYSIS FOR PC Workshop 9. First order with Dead time Let’s consider a mixing process involving pure delay followed by a well-mixed, constant volume tank. The process begins at steady state. The feed composition experiences a step change. In this workshop, you will develop a fundamental model of the effluent composition in response to the input change in Cfeed. Cfeed Cdelay Ceffluent We’ll see this model many times in the remainder of the course!

CHAPTER 4: MODELING AND ANALYSIS FOR PC Workshop 5. Sine input Let’s consider the mixing tank initially operating at steady-state in Example 3.1. Then, the feed composition varies as a sine function. Determine the concentration in the tank as a function of time. F CA0 V CA CA ?

The chemical reactor in Example 3. 3 is considered in this question The chemical reactor in Example 3.3 is considered in this question. Because of safety concerns, the concentration of A in the second CSTR must never exceed a limit of 0.53 mole/m3. Process modified: a dead time of 7 minutes between the two reactors a. Strategy 1: The inlet concentration is returned to its initial value whenever the concentration in the second tank exceeds its limit; after the action is taken, the inlet concentration is never adjusted again. Determine the dynamic response of the concentration of both tanks. b. Strategy 2: The inlet concentration is decreased to zero whenever the concentration in the second tank exceeds its limit; after the action is taken, the inlet concentration is never adjusted again. Determine the dynamic response of the concentration of both tanks. c. Strategy 3: The feed flow rate is reduced to zero whenever the concentration in the second tank exceeds its limit; after the action is taken, the inlet concentration is never adjusted again. Determine the dynamic response of the concentration of both tanks. d. Based on your results in (a)-(c), discuss how you would design an emergency system to prevent the concentration of A in the second tank from exceeding a specified maximum value.