5
Water chillers
LD
PROPELLER
CONDENSER
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
0
0
A
A
CORRECTION
POSITIVE CONDITIONS
NEGATVE CONDITIONS
K
Calculation mode
K
Calculation mode
Ev
aporator
Cooling capacity
0,98
Pfc = Pf x 0,98
1,00
See selection table
Chilled water flow
1,05
Qc = Pfc x 0,86 x 1,05
1,10
Qc = Pfc x 0,86 x 1,10
Water pressure
1,15
D
Pc =
D
P x 1,15
1,30
D
Pc =
D
P x 1,30
Average temp.
12 / 7 ° C
See table
Condenser
Cooling capacity
0,97
Pfc = Pf x 0,97
Chilled water flow
1,05
Qc=(Pfc+Pa)x0,86x1,10
Water pressure
1,10
D
Pc =
D
P x 1,10
Average temp.
35 / 40 ° C
USRT
kW x 0,2846
Btu/h
kW x 3414
kcal/h
kW x 860
Frig/h
kcal/h
Cheval vapeur (CH)
kW x 1,36
Horsepower (HP)
kW x 1,341
kPa
bar x 100
bar
mCE x 0,0981
kg/cm2
bar x 1,0197
Livre/Pouce2 (lbf/in2)
bar x 14,504
Pouce (in)
mm x 0,0394
Pied (ft)
mm x 0,0032808
Livre (lb)
kg x 2,205
Pied3/mn (cfm)
m3/h x 0,5885
Gallons US
m3 x 264,2
Gallons UK
m3 x 220
Degré Fahrenheit (°F)
(°C x 9/5) + 32
G
L
YCOL
WA
TER
COEFFICIENT
■
30 % concentration by glycol weight
■
Freezing point of the solution :
- 17.5 °C
K :
Correction coefficient
Values written in the brochure :
Pf :
cooling capacity as per selection table
Pa :
compressors power input as per selection tables
D
D
P
:
water pressure drop as per curves, for the corresponding corrected flow
value (Qc)
Values corrected as per above calculations :
Pfc
:
corrected cooling capacity
Qc
:
corrected flow, chilled or hot water
D
D
Pc
:
corrected water pressure drop, evaporator or condenser
U
NITS
CONVERSION
FORMULA
M
INIMUM
WATER
VOLUME
■
LD - LDC - LDH / ILD - ILDH
The Connect control is equipped with an anticipation logic allowing high flexibility in adjusting the set points according to the
parameters drifting, in particular for low water volume hydraulic installations.
An adapted management of the compressors operating periods avoids therefore the start of anti-short cycle functions, and in
most cases, the requirement of a buffer tank.
Remark :
Industrial processes which require high stability of water temperatures or installations with high thermal load variation can
privilege the use of LDH-ILDH models equipped with a buffer tank.
Models
LD - ILD - LDC
100
150
200
250
300
350
400
450
500
600
750
753
900
1000
Minimum volume
Of installation
112
181
110
112
174
121
174
167
106
164
161
327
257
322
