WATER-COOLED SCREW COMPRESSOR
LIQUID CHILLERS 30HXC 080-375
Operating limits,
units for very low temperature (option 6)
*
**
30HXC
Minimum flow rate, l/s*
Maximum flow rate, l/s**
090
110
130
155
175
200
230
260
310
345
8
10.6
12.4
14.5
15.6
20.5
21
24.1
29.6
30.2
15.7
21.3
25.1
28.1
33
38
39.7
48.3
62
63
For very low temperature applications the amount of
antifreeze solution added is critical for the unit operation.
The following amounts are required:
Evaporator leaving
water temperature, °C
Ethylene glycol, %
Propylene glycol, %
-6
-7
-8
-9
-10
25
28
30
33
35
27
30
NA
NA
NA
COOLING
Evaporator water flow rate with 35% ethylene
glycol
Based on a Reynolds number of 4000.
Based on a water velocity of 3.6 m/s.
Minimum flow rate, l/s*
Maximum flow rate, l/s**
090
110
130
155
175
200
230
260
310
345
11.1
14.2
16.7
19.1
21.1
25.1
27.4
32.3
40
40.6
15.7
21.3
25.1
28.1
33
38
39.7
48.3
62
63
Based on a Reynolds number of 4000.
Based on a water velocity of 3.6 m/s.
Operating range,
units for very low temperature (option 6)
Condenser entering water temperature, °C
50
48
44
D
20
15
13
C
-7
Evaporator leaving water temperature, °C
A
R
R
I
E
R
2
0
1
6
/
2
0
4
13 15
Evaporator leaving water temperature, °C
Notes:
1. Evaporator ΔT = 4 K max. - condenser ΔT = 5 K
2. Operating range applicable for full and reduced load.
3. At full load with a condenser water entering temperature below 20°C, a three-way
valve must be used to maintain the correct condensing temperature.
C
AIR TREATMENT
Operating range 30% propylene glycol
Condenser entering water temperature, °C
Operating range 35% ethylene glycol
0
1
7
Legend
C Unit operating with condensing pressure control with an analogue water control valve.
For transient operating modes (start-up and part load), the unit can operate down to a
condenser entering water temperature of 13°C.
D Operation permitted, but performance is not optimised.
245
CONTROLS
*
**
30HXC
HEATING HEATING
Evaporator water flow rate with 30% propylene
glycol