Section 7 - Technical Data; Flow Rate And Pressure Drop Charts; Glycol Correction Factors; Fig. 15 - Flow Rate And Pressure Drop - York YCAS Series Installation Operation & Maintenance

Technical Data

FLOW RATE AND PRESSURE DROP CHARTS

100
FIG. 15 – FLOW RATE AND PRESSURE DROP CHARTS
The evaporator is designed in accordance with ARI-590-
92 which allows for an increase in pres sure drop of up
to 15% above the design value given above. Debris in
the water may also cause additional pressure drop.
When using glycol solutions, pressure drops are high er
than with water (see correction factors to be applied
when using glycol solutions).
A = Correction Factor
B = Mean Temperature through Evaporator (°C)
C = Concentration W/W (%)
Excessive fl ow, above the max GPM,
will damage the evaporator.
GLYCOL CORRECTION EXAMPLE:
•
RWT = 36°F LWT = 28°F
•
Average Water Temperature = 32°F (= 0°C)
•
For 30% Propylene Glycol: From Graph, Find Correction Factor =
1.3 @ 0°C and 30%
•
Actual Measured ∆P = 12' H 0
2
•
Corrected ∆P = 12'/1.3 = 9.2' H
•
From Flow Rate and Pressure Drop Chart, locate ß ow @ 9.2' ≈
300 GPM
46

SECTION 7 - TECHNICAL DATA

C3
C4 C5
10
1
10
3 AND 4 CIRCUIT CHILLERS
MODEL NUMBER YCAS
0685
0775, 0835, 0905, 0965
1065, 1135, 1215
Pressure Conversion : Ft H20 = 2.3 x PSI

GLYCOL CORRECTION FACTORS

(With YCAS0140)
0
2
100
Water Flow (l/s)
EVAPORATOR
C3
C4
C5
ETHYLENE GLYCOL
1.45
1.40
1.35
1.30
A
1.25
1.20
1.15
1.10
1.05
-10 -8 -6 -4
PROPYLENE GLYCOL
1.8
1.7
1.6
1.5
A
1.4
1.3
1.2
1.1
1.0
-10 -8 -6 -4
FIG. 16 – GLYCOL CORRECTION FACTORS
FORM 201.19-NM8 (804)
1000
LD05883
-2 0 2 4 6 8
°C
B
-2 0 2 4 6 8
B
°C
LD03504
YORK INTERNATIONAL
50%
40%
C
30%
20%
10%
50%
40%
C
30%
20%
10%