Exercise Y
159
Log the temperature within the vessel for 10 minutes, then select the
icon to stop
logging.
Create a new results sheet and repeat the procedure with the gear pump set to a
speed of 50% to circulate (stir or mix) the water in the process vessel. Return the
gear pump setting to 0%.
Disturbances
Within the software it is possible to introduce disturbances in the temperature inside
the process vessel by changing the flowrate of water through the vessel:
In the software, select the
icon to create a new results sheet.
Select the
icon to begin data logging.
In the software, increase the PSV setting by 20%. Open the drain valve at the base
of the process vessel enough to balance the flow in and out of the vessel, so that the
fluid level in the vessel remains constant.
Log the temperature for 5 minutes.
Increase the PSV setting by a further 20%, and open the drain valve more to
maintain the fluid level within the vessel.
Continue to log the temperature for another 5 minutes, and then select the
icon to
finish data logging.
Set the PSV back to its original setting and close the drain valve.
Create a new results sheet and repeat the investigation of disturbances with the gear
pump set to a speed of 50% to circulate (stir or mix) the water in the process vessel.
Return the gear pump setting to 0%.
Temperature Set Point
Investigate the effect of changing the set point temperature:
Create a new results sheet by selecting the
icon.
In the software, alter the temperature set point to 40°C.
Select the
icon to begin data logging.
Log the temperature for 5 minutes, and then select the
icon to finish data
logging.
Repeat the procedure, altering the set point and recording the change in temperature
over time. Suggested values for the temperature set point value are 45 and 50°C.
Depending on the starting temperature of the water, it may not be possible to achieve
temperatures above 50°C during indirect heating.
Return the temperature set point to its original value.
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