M0G940E8-00 04/07/08
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58
CORRECTION FACTOR FOR ANTIFREEZE SOLUTIONS
% ethylene glycol by weight
5%
10%
15%
20%
25%
30%
35%
40%
Freezing temperature
°C -2,0 -3,9 -6,5 -8,9 -11,8 -15,6 -19,0 -23,4
Safety temperature
°C 3,0 1,0 -1,0 -4,0 -6,0 -10,0 -14,0 -19,0
Cooling Capacity Factor
Nr 0,995 0,990 0,985 0,981 0,977 0,974 0,971 0,968
Compressor input Factor
Nr 0,997 0,993 0,990 0,988 0,986 0,984 0,982 0,981
Internal exchanger Glycol solution flow Factor
Nr 1,003 1,010 1,020 1,033 1,050 1,072 1,095 1,124
Pressure drop Factor
Nr 1,029 1,060 1,090 1,118 1,149 1,182 1,211 1,243
The correction factors shown refer to water and glycol ethylene mixes used to prevent the formation of frost on the exchangers in the water circuit during inactivity in winter.
FOULING CORRECTION FACTOR
INTERNAL EXCHANGER
EXTERNAL EXCHANGER
m² °C/W
F1
FK1
F2
FK2
0.44
x
10^(-4)
1,00 1,00 1,00 1,00
0.88
x
10^(-4)
0,97 0,99 0,97 1,08
1.76
x
10^(-4)
0,94 0,98 0,92 1,05
The cooling performance values provided in the tables are based on the external exchanger having clean plates (fouling factor 1). For different fouling factor values, multiply the performance by the
coefficients shown in the table.
F1 = Cooling capacity correction factors
FK1 = Compressor power input correction factor
PUMP PERFORMANCE
EXCHANGER PRESSURE DROPS
10
20
30
40
50
60
70
80
90
100
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
Q (l/s)
DP
(
k
P
a
)
41
31
51
21
DP[KPA]=USEFUL DISCHARGE HEAD
Q[L/S]= WATER-FLOW RATE
THE HEADS ARE INTENDED AS AVAILABLE AT THE UNIT CONNECTIONS
10
20
30
40
50
60
70
80
90
100
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
Q (l/s)
DP
(
k
P
a
)
21
31
41
51
DP = PRESSURE DROP
Q = WATER FLOW
SOUND LEVELS
Sound Power Level (dB)
Size
Octave band (Hz)
63
125 250 500 1000
2000
4000 8000
Sound
pressure
level
dB(A)
Sound
power
level
dB(A)
21
74
79 69 69 62 57 48 40 55
69
31
73
79 68 68 62 57 50 41 55
69
41
74
80 69 69 63 59 50 40 56
70
51
75 83 73 74 66 61
53 46 59
72
Measures according to ISO 3744 regulations, with respect to the EUROVENT 8/1
certification.
The sound pressure is measured at 1 m from the external surface of the unit in
open field conditions.
data referred to the following conditions :
Internal exchanger water = 12/7 °C; outdoor air temperature 35°C
Summary of Contents for WSAN-XPR 21
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