16
Air cooled chillers
LX
PROPELLER
F
ANS
A I R C O N D I T I O N I N G - R E F R I G E R A T I O N - A I R H A N D L I N G - H E A T E X C H A N G E -
N
N
A
A
0
0
4
4
.
.
5
5
3
3
1
1
B
B
Difference of temperature for performances calculation tables
Example
:
For a water outlet :
+ 5 °C (
D
T for performances calculation 5 °C)
D
T minimum :
3,1 °C
Water temp :
8,1 / 5 °C
D
T maximum :
7,5 °C
Water temp :
12,5 / 5 °C
-8
-2
5
12
-8
-2
5
12
C
B
A
C
B
A
38
41
10
D
10
D
35
38
-15
-15
Evaporator water outlet temperature °C
Condenser air inlet temperature °C
Evaporator water outlet temperature °C
A
- Full load operation with pure water
B
- Full load operation with glycol compulsory
C
- Part load operation
D
- Operation without HPS
Condenser air inlet temperature °C
O
PERATION
RANGES
E
VAPORA
TOR
LIMITS
The curve below represents the min.
and max.
admissible
temperature differences on pure water or glycol water as a
function of the fluid outlet temperature at the evaporator.
Check also minimum and maximum temperature differences
according to minimum and maximum flow (see curves "Hydraulic
characteristics").
Mass
concentration %
Multiplying coefficient
Cooling
capacity
Chilled water
flow
Chilled water pressure drops
10
0.99
1.05
1.05
20
0.985
1.10
1.10
30
0.98
1.15
1.15
40
0.97
1.20
1.23
C
ORRECTION
FACTORS
FOR
ETHYLENE
GL
YCOL
Evaporator
Glycol concentration necessary
Mass concentration %
0
10
20
30
40
Ethylene glycol
Freezing point °C
0
-4
-9
-16
-23
Minimum water outlet °C
4
2
0
-5
-11
Propylene glycol
Freezing point °C
0
-3
-7
-13
-22
Minimum water outlet °C
4
3
-2
-4
-10
Low noise - Xtra low noise versions
715 rpm fan speed
Standard version
905 rpm fan speed
Chilled water outlet temperature (°C)
D
T between chilled water
inlet / outlet difference °C
