69
9.5 SOUND LEVELS
INTERNAL EXCHANGER
m² °C/W F1 FK1
0.44 x 10^(-4) 1,00 1,00
0.88 x 10^(-4) 0,97 0,99
1.76 x 10^(-4) 0,94 0,98
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
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.
9.6 FOULING CORRECTION FACTOR
9.7 CORRECTION FACTOR FOR ANTIFREEZE SOLUTIONS
9.8 INTERNAL EXCHANGER PRESSURE DROP
9 - TECHNICAL INFORMATION
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
% ethylene glycol by weight
Measures according to EN 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 :
water to internal exchanger 30/35°C
outdoor air temperature 7°C DB / 6°C WB
Sound Power Level (dB)
Sound
pressure
level
Octave band (Hz)
63 125 250 500 1000 2000 4000 8000 dB(A) dB(A)
25
80 76 65 61 58 54 44 36
49
65
31
83 78 68 62 61 55 45 38
51
67
41
83 79 68 64 62 57 47 39
52
68
Sound
power level
51
85 80 69 65 63 57 48 40
53
69
61
88 85 75 71 68 63 53 45
58
75
81
92 84 76 72 69 65 55 47
59
76
31
76 74 63 59 57 52 42 34
47
63
SIZE
0
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 1,0 1,1 1,2 1,3 1,4 1,5 1,6 1,7 1,8 1,9
Q (l/s)
DP (kPa)
61
81
31- 41 5121 25
DP = PRESSURE DROP
Q = WATER FLOW
Data referred to the following conditions :
- water to internal exchanger 30/35°C
- outdoor air temperature 7°C DB / 6°C WB
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