Internal and External Friction Losses
The friction losses of the straight pipes and fittings are considered external losses to the hydronic
system. Other than that, there are also losses in the chiller unit itself, i.e. through the brazed plate
heat exchanger (BPHE), internal pipework, pump fittings, flow switch, etc.
All these internal losses
are as tabulated below:
Friction loss, Nominal water
Model
psi flow rate, GPM
AC 40A/AR
5.4 6.7
AC 50A/AR
6.4 8.9
AC 58A/AR
5.7 11.1
AC 75B/BR
6.0 17.8
AC 100B/BR
6.5 22.2
AC 125B/BR
6.6 27.7
AC 80C/CR
5.9 17.5
AC 100C/CR
12.5 20.8
AC 120C/CR
6.4 26.7
AC 150C/CR
9.9 31.7
In the same manner, each fan coil unit has its own internal losses through the heat exchanger.
Please refer to the respective Technical Manual for the values of these losses.
Section 4 Page 71
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