Modeling One and Twophase Water Hammer Flows - Advances in Control and Automation of Water Systems - page 53

tABle 3.2 Model Summary and Parameter Estimates (Water hammer condition).

Model Un-standardized

Coefficients

Standardized Coefficients t Sig.

Std. Error Beta

1 (Constant) 28.762 29.73 - 0.967 0.346

flow 0.031 0.01 0.399 2.944 0.009

distance -0.005 0.001 -0.588 -4.356 0

time 0.731 0.464 0.117 1.574 0.133

2 (Constant) 14.265 29.344 - 0.486 0.632

flow 0.036 0.01 0.469 3.533 0.002

distance -0.004 0.001 -0.52 -3.918 0.001

3 (Constant) 97.523 1.519 - 64.189 0

4 (Constant) 117.759 2.114 - 55.697 0

distance -0.008 0.001 -0.913 -10.033 0

5 (Constant) 14.265 29.344 - 0.486 0.632

flow 0.036 0.01 0.469 3.533 0.002

distance -0.004 0.001 -0.52 -3.918 0.001

Regression Equation defined in stage (1) has been accepted, because its coeffi-
cients are meaningful:

figure 3.4 Scatter diagram for Lab Tests (Research Field Tests Model).