A process instrument reading, Z (volts), is thought to be related to a process stream flow rate V(L/s) and pressure P(kPa) by the following expression:

Process data have been obtained in two sets of runs-one with V held constant, the other with P held constant. The data are as follows:

(a) Suppose you had only performed runs 2, 3 and 5. Calculate a, b, and c algebraically from the data for these three runs.

(b) Now use a graphical method and all the data to calculate a, b, and c. Comment on why your would have more confidence in this result than in that of part(a).

Transcribed Image Text:

Z = avb pe Point 1 2 3 4 5 V(L/s) 0.65 1.02 1.75 3.43 1.02 1.02 1.02 P(kPa) 11.2 11.2 11.2 11.2 9.1 7.6 5.4 Z(volts) 2.27 2.58 3.72 5.21 3.50 4.19 5.89 6 7