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5 - APPLICATION DATA
5.2 - Operating range 61WG/30WG/30WGA
Evaporator leaving water temperature, °C
Condenser leaving water
temperature, °C
15
20
25
30
35
40
45
50
55
60
65
-8 -6 -4 -2 0 2 4
6
8
10
12
14
16
18
20
StandardOption 272
61WG standard unit
61WG unit with option 272 (brine to water)
Evaporator leaving water temperature, °C
Condenser leaving water
temperature, °C
15
20
25
30
35
40
45
50
55
60
65
-14 -12 -10 -8 -6 -4 -2 0 2 4
6
8
10
12
14
16
18
20
Standard
Option 6
30WG standard unit
30WG unit with option 6 (brine)
20
25
30
35
40
45
50
55
60
65
Evaporator leaving water temperature, °C
Condenser leaving water
temperature, °C
StandardOption 5B
30WGA standard unit
30WGA uwith option 5B (% glycol < 25%)
5.3 - Minimum chilled water ow
If the system water ow rate is lower than the minimum water ow
rate, recirculation of the evaporator flow may occur. The
temperature of the mixture leaving the evaporator must never be
less than 2.5 K lower than the chilled water entering temperature.
5.4 - Maximum chilled water ow
The maximum chilled water ow is limited by the maximum
permitted pressure drop in the evaporator. It is provided in the
tables in chapter 5.7. If the ow exceeds the maximum value, two
solutions are possible:
- Modify the ow rate with a control valve.
- Bypass the evaporator to obtain a highter temperature
difference with a lower evaporator ow rate.
5.5 - Variable ow
A pump with variable ow can be used in these units. The units
maintain a constant leaving water temperature under all ow
conditions. For this to happen, the minimum ow rate must be
higher than the minimum ow given in the table of permissible
ow rates and must not vary by more than 10% per minute.
If the ow rate changes more rapidly, the system should contain
a minimum of 6.5 litres of water per kW instead of the values below.
5.6 - Water ow rates
5.6.1 - Standard 61WG/30WG/30WGA
61WG/
30WG/
30WGA
Evaporator water ow rate, l/s
Minimum
(1)
Minimum
(2)
Maximum
(3)
Maximum
(4)
Low
pressure
High
pressure
Low
pressure
High
pressure
20 1,0 0,9 0,5 3,5 3,7 3,8
25 1,0 1,0 0,5 3,8 3,9 4,1
30 1,0 1,0 0,5 3,8 3,9 4,1
35 1,1 1,1 0,6 4,1 4,3 4,7
40 1,2 1,1 0,6 4,3 4,5 5,0
45 1,2 1,1 0,8 4,5 4,8 5,4
50 1,6 1,4 0,8 6,1 7,9 9,2
60 1,5 1,6 1,0 6,2 8,1 9,9
70 1,6 1,5 1,1 6,3 8,3 10,3
80 1,6 1,5 1,3 6,4 8,4 10,9
90 2,0 1,6 1,5 8,1 8,8 12,5
110 2,0 1,3 0,8 7,5 11,8 14,4
120 2,0 1,3 0,9 7,6 12,5 16,7
140 2,0 1,3 1 8,6 12,8 18,3
150 2,0 1,3 0,8 8,6 12,5 16,1
170 2,0 1,3 0,9 13,6 13,1 18,3
190 2,0 1,3 1 14,0 13,3 20,3
(1) Units with hydraulic module
Flow rate for a maximum permitted temperature difference at the minimum
leaving water temperature
(2) Units without hydraulic module
Flow rate for a maximum permitted temperature difference at the minimum
leaving water temperature
(3) Units with hydraulic module
Maximum ow rate for an available pressure of 20 kPa (unit with low-pressure
hydraulic module) or 50 kPa (unit with high-pressure hydraulic module)
(4) Units without hydraulic module
Maximum ow rate for a pressure drop of 100 kPa in the plate heat exchanger.
61WG/
30WG/
30WGA
Evaporator water ow rate, l/s
Minimum
(1)
Maximum
(3)
Maximum
(4)
Low pressure High pressure
20 0,3 3,5 3,6 3,8
25 0,3 3,7 3,9 4,1
30 0,3 3,7 3,9 4,1
35 0,4 4 4,2 4,7
40 0,4 4,2 4,4 5,0
45 0,4 4,4 4,6 5,4
50 0,4 5,4 6,9 7,0
60 0,5 5,6 7,1 7,5
70 0,5 5,7 7,3 7,8
80 0,6 5,8 7,5 8,2
90 0,6 7,4 8 9,3
110 0,5 11,4 11,7 13,1
120 0,5 12,5 12,4 15,0
140 0,6 13,2 12,9 16,7
150 0,5 12,6 13,8 16,4
170 0,5 13,6 14,4 18,9
190 0,6 14,0 14,7 20,6
Note: Operation permitted up to a value of 20 K.
(1) Units with or without hydraulic module
Minimum ow rate for a water temperature difference of 18 K-
(2) Units without hydraulic module
Maximum ow rate for an available pressure of 20 kPa (unit with low-pressure
hydraulic module) or 50 kPa (unit with high-pressure hydraulic module)
(3) Units without hydraulic module
Maximum ow rate for a pressure drop of 100 kPa in the plate heat exchanger
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