York YLCC-H Technical Information page 18

Correcting factors
Foul factors
Foul factor m²,
Capacity factor
°C/kW
0.044
0.088
0.76
0.352
Altitude factors
Altitude (m) Capacity factor
0
600
 200
 800
2 400
Correcting factors for real temperature of coil air intake
at flows other than nominal
Flow % 70
Correction in °C on real
5
temperature of coil in-
take
Factors with water and glycol
Glycol can be used for antifreeze protection, or as brine for
operation at low temperatures. We recommend the use of wa-
ter and glycol when the discharge water temperature is below
+6° C. The "Solution with glycol/freezing point" table gives the
freezing point of water with glycol, and the "Recommended
glycol concentration" table shows the glycol concentration
needed, depending upon application.
Glycol contains anticorrosive and antifoam components that
favour circuit protection.
Solution with glycol/freezing point
Glycol % per weight
0
0
20
30
35
40
50
8
Evaporator
Absorbed power
factor, comp.
.000 .000
0.987 0.995
0.964 0.985
0.926 0.962
Absorbed power
factor, comp.
.000 .000
0.987 .00
0.973 .020
0.958 .029
0.943 .038
80 90 00 0
3 .5 0 -
Freezing point °C
0
-4
-0
-7
-20
-25
-37
A mixture of glycol and water has a freezing point below that
of pure water. Depending upon the concentration of glycol in
this solution, an even lower freezing point can be achieved
and this protects the circuit when the unit is off and ambient
temperature is low (below 0° C). This table indicates freezing
point in accordance with glycol concentration. This concentra-
tion appears in % per weight.
Recommended glycol concentration
TAS °C
6°C > TAS > 0°C
0°C > TAS > -5°C
The glycol concentration in the water should be checked
regularly to ensure adequate protection of the chiller.
Correcting factors
Ethylene
glycol
percentage
by weight
(%)
20 30
20
-2 -2.5
30
Water flow correcting factors for ethylene glycol solu-
tions
Ethylene glycol
percentage
by weight (%)
20
30
Glycol % per weight
Nominal capacity
correcting factors
Evaporator
discharge
Air temperature at
water
condenser intake (°C DB)
temperature
(°C)
25
5 .045
4 .004
3 0.962
2 0.92
 0.879
0 0.838
- 0.795
-2 0.764
-3 0.734
-4 0.703
-5 0.673
Correcting factors
Water flow
.035
.075
20
30
35 45
0.902 0.754
0.866 0.726
0.83 0.697
0.794 0.669
0.758 0.64
0.722 0.62
0.68 0.574
0.652 0.545
0.623 0.55
0.594 0.486
0.565 0.457
Pressure drop
.6
.27