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Consider the production model of chapter 4. As we discussed in class, it is a general equilibrium model. Please discuss in no more than 6 lines i) what general equilibrium means? and, ii) why do you think is important?

In an APA-formatted paper of at least 4 pages

• Evaluate how Wal-Mart has prioritized and responded to various stakeholders.
• What has driven Wal-Mart’s priorities and responses?
• What can Wal-Mart do to develop an improved ethical culture?
• Using your MBA brilliance, please create solutions as to what Wal-Mart could do to respond more positively to its diverse stakeholders.
• How do you know your solutions will work? (i.e., Please use research to defend your ideas!)

TASKS:

1. On the lab computer, locate and open the CE2000 software application, and load

`exp6-1.ict’ le. Ask TA for the computer Username and Password. Connect the

CE117 Control Panel as shown in Fig. 1 using the black and red colored cables located

in the white small box. On the software, adjust the voltage to the proportional valve

(a.k.a Valve Control) to 10 V (fully open). Analog signals will pass from the Analog-

Digital-Analog (ADA) section to the valve and the pumps, and from the process vessel

level and temperature transmitters back to the ADA section.

2. On the Control Panel (see Fig. 1), set the heater control to `Manual’ by moving the

metal switch and adjust to full power by turning the black-colored knob clockwise. Set

the cooler fan to maximum speed by turning the black-colored knob clockwise. Set

both shiny metal pump switches to `External’. Close the loop bypass valve (wing nut

on the Process Trainer panel), fully open the process vessel drain valve (red-colored ball

valve on the Process Trainer panel), and fully open the air vent (red-colored ball valve

on the top of the Process Trainer panel) such that it is in-line with the pipe. Switch

on the stirrer by moving the shiny metal switch on the Control Panel.

Figure 1: Wiring diagram for control panel.

3. On the right side of the Process Trainer Panel, turn ON the black-colored switch.

4. On the software (see Fig. 2), the blocks titled `PID’ are three term controllers, one

controls the heater loop pump (temperature control), the other controls the process loop

pump (level control). The proportional, integral and derivative values in the controllers

are already set to:

Proportional gain: 10

Integral: 0.1

Derivative: 0

Conrm that the PID settings.

5. On the software panel, there are two set points, one for the temperature of the process

vessel, the other for the level of the process vessel. Run the software and adjust the

temperature set point to correspond to the temperature of the process vessel (3.0

V), indicated by the TT5 display, this is the reference temperature. Adjust the level

set point to 7.5 V (the water in the process vessel must just cover the heat exchanger,

so you may need to adjust the level set point slightly to achieve this). Hit Play/Run

(blue colored) and Record (red colored) buttons on the software application.

6. Read the TT5 and water level in the Process Vessel using the millimeter scale on its

Figure 2: Screenshot of the software panel.

front.

Figure 3: Units conversion.

7. Increase the temperature set point so that it is 5C higher than the reference tem-

perature. Refer to Fig. 3 for the voltage to temperature conversion of the temperature

Figure 4: Screenshot of a un-formatted result for your reference.

transmitters. Note how long the process takes to adjust to the new heater tank tem-

perature. Allow up to 10 minutes for the temperature to stabilize.

8. Record the water level in the Process Vessel using the millimeter scale and temperature

TT5 using the software application. There should be very minimal change in the

measurement!

9. Increase the level set point by 1 V and note how both control systems respond, that

is, what happens to the temperature TT5. The level control loop moves to the new

desired level. The temperature of the tank begins to drop, but the temperature control

loop responds and returns the temperature to the desired value.

10. Increase the temperature set point by approximately 10% and note that only the tem-

perature control loop responds (the temperature control does not inuence the temper-

ature control loop). Allow 5 minutes for the temperature to stabilize.

11. Your experiment is complete. Show the TA your data and get their OK.

12. Stop the data recording on the software application.

13. Now export your experiment data from the computer to your ash drive. Fig. 4 shows

a screenshot of a un-formatted result for your reference! Before you export the graph,

you must rst edit the graph using the software application. For this, go to Graph !

Draw ! edit the graph using functions such as Autoscale, making x-, y- labels, and

Plot title.

14. Your data export is complete. Show the TA your data and get their OK.

15. Make a schematic sketch of the experiment setup for your lab report and get

your TA approval.

16. Turn OFF the Process Trainer switch, unplug the red/black-colored cables from the

Control Panel, close the software application, and log out of the computer.

17. Unplug the black-colored power cable from the wall (under the table).

Questions

1. Describe how a PID controller works in 8-10 sentences using a schematic sketch with

examples.

You must answer the discussion question

2. How does the response speed of the temperature control compare with level control?

You must answer the discussion question