9
GB 03/2009
BRAN H
WATER CIRCUIT DATA
I A
Water content in the system
Size
0011
0025 0041
Minimum water content
l
24
32
40
cPf
cQ
cdp
0
1
1
1
12%
0,985
1,02
1,07
20%
0,98
1,04
1,11
28%
0,974
1,075
1,18
35%
0,97
1,11
1,22
40%
0,965
1,14
1,24
Ethylene glycol solutions
Water and ethylene glycol solutions used as a heat carrier in
the place of water reduce the performance of the unit.
Multiply the performance figures by the values given in the
following table.
0
-5
-10
-15
-20
-25
Freezing point (°C)
Percentage of ethylene glycol in weight
cPf: capacity correction factor
cQ flow rate correction factor
cdp: pressure drop correction factor
f1: capacity correction factor
fk1: compressor power input correction factor
fx1: total power input correction factor
Fouling factors
The performance data given refer to conditions with clean
evaporator plates (fouling factor=1).
For different fouling factors, multiply the figures in the perfor-
mance tables by the coefficient given in the following table.
4,4 x 10
-5
0,86 x 10
-4
1,72 x10
-4
-
0,96
0,93
-
0,99
0,98
-
0,99
0,98
Fouling factors
(m
2
°C/W)
f1
Evaporator
fk1
fx1
0011
kPa
17
26
31
84
126
138
-
-
-
0025
Pressure
kPa
8
12
15
39
58
63
75
-
-
0041
drop
kPa
-
6
8
21
31
34
40
57
69
PUMP USEFUL HEAD CURVE (*)
(*) To obtain the useful head of the installation, subtract the pressure drop of the plate heat exchanger.
100
90
80
70
60
50
40
30
20
10
0
10,1
9,1
8,1
7,1
6,1
5,0
4,0
3,0
2,0
1,0
0
0,0
0,5
1,0
1,5
2,0
2,5
3,0
3,5
4,0
4,5
5,0
5,5
6,0
6,5
7,0
7,5
8,0
8,5
9,0 m3/h
0,13 0,27 0,41 0,55 0,69 0,83 0,97 1,11 1,25 1,38 1,52 1,66 1,80 1,94 2,08 2,22 2,36
2,5
L/s
KPa
mCA
HEAT EXCHANGER PRESSURE DROP (WATER SIDE)
Model Water
m
3
/h
0,8
1,0
1,1
1,8
2,2
2,3
2,5
3,0
3,3
flow
l/sec
0,223
0,278
0,306
0,501
0,612
0,640
0,696
0,835
0,919
Note: the values highlighted refer to the rated flow: external air 35°C - evaporator water 12/7°C
