Exercise Q
127
Continue to control the temperature, noting the action required.
Set the PSV back to its original setting, close the drain valve, and continue to control
the temperature within the vessel.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon.
Results
For easy identification or results, it is suggested that each results sheet is renamed
with a descriptive title (e.g. ‘Disturbances’, etc.). The entire workbook should be
saved with a suitable filename for future reference (e.g. PCT40 Exercise Q).
Each set of data should be plotted on a graph of temperature T1 against time.
Write up your experiment, commenting on the heating and cooling characteristics of
continuous operation and the actions required for manual control of the heating
process. Give reasons for any time delay between applying a control action and
observing a response. Explain any difference between heating and cooling rate. Give
examples of industrial control situations in which a step change in flow rate might
occur.
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