803 B – 04/11 D – pag. 9/24
Table 1 – Operating limits
PFS 103.1÷296.2
HFC 134a
Max evaporator leaving water temperature
°C
15
Min evaporator leaving water temperature (without glycol)
°C
3
Min evaporator leaving water temperature (with glycol)
°C
-8
Max condenser leaving water temperature
°C
50
Table 2 – Evaporator fouling factors
Fouling factors
m
2
°C / kW
Cooling capacity
correction factor
Power input
corretion factor
COP
correction factor
0,0176
1,000
1,000
1,000
0,0440
0,978
0,986
0,992
0,0880
0,957
0,974
0,983
0,1320
0,938
0,962
0,975
Table 3 – Condenser fouling factors
Fouling factors
m
2
°C / kW
Cooling capacity
correction factor
Power input
corretion factor
COP
correction factor
0,044
1,000
1,000
1,000
0,088
0,990
1,018
0,973
0,132
0,981
1,036
0,945
Table 4 – Ethylene glycol and low ambient temperature correction factors
Air ambient temperature °C
-3
-8
-15
-23
-35
% of ethylene glycol by weight
10
20
30
40
50
Cooling capacity correction factor
0,991
0,982
0,972
0,961
0,946
Power input correction factor
0,996
0,992
0,986
0,976
0,966
COP correction factor
0,995
0,990
0,986
0,985
0,979
Flow rate correction factor
1,013
1,040
1,074
1,121
1,178
Water pressure drops correction factor
1,070
1,129
1,181
1,263
1,308
Table 5 – Low temperature operation performance factors
Ethylene glycol/water leaving temperature °C
2
0
-2
-4
-6
-8
Min. % of ethylene glycol
10
20
20
30
30
30
Cooling capacity correction factor
0,842
0,785
0,725
0,670
0,613
0,562
Power input compressors correction factor
0,95
0,94
0,92
0,89
0,87
0,84
