Armfield Instruction Manual
156
Results
For easy identification or results, it is suggested that each results sheet is renamed
with a descriptive title (e.g. ‘Flow rate’, ‘Cycle Time’, etc.). The entire workbook
should be saved with a suitable filename for future reference (e.g. PCT40 Exercise
X).
Each set of data should be plotted on a graph of temperature T3 against time.
Make a comparison of each variation in the experimental conditions against the
graph of the initial set of results, noting the difference in response. Compare the
results obtained using time proportional control against those using a simple on/off
controller (as in Exercise W). Comment on the effect of stirring.
Describe the effect of cycle time on an indirect temperature control system.
Suggest industrial applications in which step-changes in flow rate might be
experienced. Discuss the suitability of time-proportional control for those applications.
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