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6 - APPLICATION DATA
6.5 - System minimum water volume
Whichever the system, the water loop minimum capacity is given
by the formula:
Capacity = Cap (kW) x N litres
Application
Normal air conditioning
Process type cooling
Where Cap is the nominal system cooling capacity (kW) at the
nominal operating conditions of the installation.
This volume is necessary for stable operation and accurate
temperature control.
It is often necessary to add a buffer water tank to the circuit in order
to achieve the required volume. The tank must itself be internally
baffled in order to ensure proper mixing of the liquid (water or
brine). Refer to the examples below.
Connection to a buffer tank
Bad
Bad
6.6 - Maximum system water volume
Units with hydraulic module incorporate an expansion tank that
limits the water volume. The table below gives the maximum loop
volume for pure water or ethylene glycol with various system
concentrations, as well as the static pressures. If the maximum
volume is insufficient, compared to the minimum system water
loop volume, an additional expansion tank must be added to the
system.
30XB(E/P)
Static pressure
bar
Pure water
10% EG
20% EG
30% EG
40% EG
EG : Ethylene Glycol
52
N
3,25
6,5
Good
Good
Sizes 250 to 450
500
1
2
2,5
1
l
2400 1600 1200 3960 2640 1980
l
1800 1200 900 2940 1960 1470
l
1320 880
660 2100 1400 1050
l
1080 720
540 1740 1160 870
l
900 600
450 1500 1000 750
6.7 - Evaporator water flow rate
30XB(E/P)
250
300
350
400
450
500
600
700
750
800
850
900
1000
1100
1200
1300
1400
1500
1550
1700
(1) Minimum flow rate for optimal efficiency in variable flow configuration
(2) Maximum flow rate for a pressure drop of 100 kPa in the exchanger
2
2,5
Minimum flow rate
(l/s) Maximum flow rate
(1)
4,6
5,0
5,4
6,5
7,4
8,3
10,4
11,3
12,2
13,1
13,8
15,0
16,4
19,1
21,1
22,2
24,0
25,2
25,7
28,1
(l/s)
(2)
37,5
40,5
40,5
34,1
36,9
42,0
45,0
56,1
59,1
67,1
67,1
73,9
83,9
87,8
126,5
92,9
132,1
107,4
109,4
107,4
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