1200

800

400

0

0.2

0.4

0.6

0.8

1.0

Pipe Diameter (m)

This result is plotted in Figure 12, where we have arbitrarily set the aggregate of all

the coefficients of *d *equal to 1. We see that the slope is everywhere negative and that

it is increasingly negative for decreasing values of the pipe diameter. This tells us

that an incremental increase in the pipe diameter will have a greater effect on

reducing the pressure loss at smaller pipe diameters than at larger ones. Thus, if we

have a choice of several possible pipe segments whose diameters we can increase,

we can achieve a larger pressure loss reduction for a given increase in pipe size by

choosing the pipe segment with the smallest diameter.

Unfortunately, our results tell us we should favor the smaller diameters from a

pressure losses reduction standpoint, but from the standpoint of heat loss costs,

0

2000

4000

0.2

0.4

0.6

0.8

1.0

Pipe Diameter (m)

57

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