Let us now examine the sample calculation of the friction loss shown in Application Example
No. 1 (Section 4).
The flowrate in that example is 11 USGPM = 2.497 m
3
/hr at a total friction loss of 14.67m.
For the mini chiller model AC 58A, the pump used is CH2-30.
2.497 m
3
/h
The performance curve of the pump
shows that at the design flowrate, the
pump is able to deliver a head
pressure of 20 m. This is more
than sufficient to cater for the
total system friction loss.
Therefore, the pump is OK.
20 m
Similarly, in Application Example No. 2, we have a flowrate of 27 usgpm with a requirement
of total friction loss of 26.4m. Entering now into the pump performance curve of CH4-40,
we find that at this flowrate, the pump can only deliver a head pressure of 19 m.
27 USGPM
his is not enough for the system.
ate.
T
Therefore, it is necessary to
redesign the piping network
to have a lower friction loss
in order for the pump to
deliver the required flowr
19 m
Section 5 Page 76
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