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Technical Data
FLOW RATE AND PRESSURE DROP CHARTS
Pressure Conversion : Ft H20 = 2.3 x PSI
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
EVAPORATOR WATER PRESSURE DROP
(SI UNITS)
YCAS0250 - 0440
1000.00
100.00
10.00
E
1.00
10.00
Water Flow (l/s)
MODEL NUMBER YCAS
0693, 0773, 0783, 0873, 0953
1063, 1093, 1163, 1263
GLYCOL CORRECTION FACTORS
(With YCAS0140)
0
2
F
100.00
LD04482A
EVAPORATOR
E
F
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-NM6 (804)
-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%
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Troubleshooting
