York YLCC-H - Correcting Factors; Factors for Fouling, Altitude, Flow, and Glycol

18
20 1.035 1.16
30 1.075 1.27
25 35 45
5 1.045 0.902 0.754
4 1.004 0.866 0.726
3 0.962 0.83 0.697
2 0.921 0.794 0.669
1 0.879 0.758 0.64
0 0.838 0.722 0.612
-1 0.795 0.681 0.574
-2 0.764 0.652 0.545
-3 0.734 0.623 0.515
-4 0.703 0.594 0.486
-5 0.673 0.565 0.457
0 0
10 -4
20 -10
30 -17
35 -20
40 -25
50 -37
Flow % 70 80 90 100 110 120 130
5 3 1.5 0 -1 -2 -2.5
Correction in °C on real
temperature of coil in-
take
TAS °C Glycol % per weight
6°C > TAS > 0°C 20
0°C > TAS > -5°C 30
Ethylene
glycol
percentage
by weight
(%)
Evaporator
discharge
water
temperature
(°C)
Nominal capacity
correcting factors
Air temperature at
condenser intake (°C DB)
20
30
Evaporator
Foul factor m²,
°C/kW
Capacity factor
Absorbed power
factor, comp.
0.044 1.000 1.000
0.088 0.987 0.995
0.176 0.964 0.985
0.352 0.926 0.962
0 1.000 1.000
600 0.987 1.010
1 200 0.973 1.020
1 800 0.958 1.029
2 400 0.943 1.038
Altitude (m) Capacity factor
Absorbed power
factor, comp.
Correcting factors
Foul factors
Altitude factors
Correcting factors for real temperature of coil air intake
at flows other than nominal
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 Freezing point °C
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
The glycol concentration in the water should be checked
regularly to ensure adequate protection of the chiller.
Correcting factors
Water flow correcting factors for ethylene glycol solu-
tions
Correcting factors
Ethylene glycol
percentage
by weight (%)
Water flow
Pressure drop