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06617645-02
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COMPRESSORS CAPACITY STEP CONTROLS
CORRECTION TABLE Operation with glycol
Water temp. Glycol WFCF PDCF
10% 1,012 1,125
20% 1,048 1,32
7
35% 1,109 1,62
10% 0,870 0,85
20% 0,875 0,92
3
35% 0,925 1,13
10% 0,710 0,64
20% 0,730 0,85
-2
35% 0,770 1,05
10% --- ---
20% 0,600 0,56
-5
35% 0,625 0,7
WFCF = Water flow correction factor PDCF = Pressure drop correction factor
The water flow rate and pressure drop correction factors are to be applied directly to the values given for
operation without glycol. The water flow rate correction factor is calculated in order to maintain the same
temperature difference as that which would be obtained without glycol. The pressure drop correction factor
takes into account the different flow rate obtained from the application of the flow rate correction factor.
When the new flow rate is determind the capacity can be calculated using the formula Q=4.19m ΔT, where Q
is the duty in kw, m is the flow rate in kg/s and ΔT is the fluid temperature difference.
CORRECTION TABLES Different DT
Water temperature
difference
3 5 8
CCCP 0,99 1 1,02
IPCF 0,99 1 1,01
CCCP = Cooling capacity correction factor IPCF = Input power correction factor
CORRECTION TABLES Different Fouling factors
Fouling factor 0,00005 0,0001 0,0002
CCCP 1 0,98 0,94
IPCF 1 0,98 0,95
CCCP = Cooling capacity correction factor IPCF = Input power correction factor