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6 - APPLICATION DATA
6.9 - Variable flow evaporator
Variable evaporator flow can be used. The controlled flow rate
must be higher than the minimum flow given in the table of
permissible flow rates and must not vary by more than 10% per
minute.
If the flow rate changes more rapidly, the system should contain
a minimum of 6.5 litres of water per kW instead of 3.25 l/kW. It is
possible to use a dedicated terminal to connect the pump drive
(0/10V signal).
Please refer to SmartVu
control manual.
TM
6.10 - System minimum water volume
Whichever the system, the water loop minimum volume is given
by the formula: Volume = 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.
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
6.11 - Pressure drop curves
Units with two evaporator passes (standard)
120
110
100
90
80
70
60
50
40
30
20
10
0
10
20
30
Water flow rate, l/s
N
3,25
6,5
Good
Good
1
2
3
40
50
60
70
80
Units with one evaporator pass (option 100C)
36
33
30
27
24
21
18
15
12
9
6
3
0
10
20
Units with two condenser passes (standard)
120
110
100
90
80
70
60
50
40
30
20
10
0
10
20
Units with one condenser pass (option 102C)
36
33
30
27
24
21
18
15
12
9
6
3
0
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
1
Sizes 580, 630
2
Sizes 810, 880
90
1
30
40
50
60
70
80
90
Water flow rate, l/s
2
1
30
40
50
60
70
80
90
Water flow rate, l/s
2
1
Water flow rate, l/s
3
Sizes 1150, 1280, 1470, 1570, 1710
2
3
100 110 120
3
100 110 120
3
19
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