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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
New PC 802 Catalog No. 510-509 Printed in U.S.A. Form 5F,H/09RH-2XA Pg 40 8-02 Replaces: 5F,H/09RH-1XA
Copyright 2002 Carrier Corporation
Book 3
Ta b D E 1
Book 2244
Tab 2a4a3a4b
Determine glycol factor (GF) by entering Fig. 22 at proper
glycol concentration and reading left from glycol factor line —
in this case a glycol gpm factor of 33.5.
Therefore, at 32.5% by weight ethylene glycol specified and
used to satisfy design conditions, a flow rate of 513 gpm of
brine solution would be required and this value used to select a
closed circuit cooler. Closed circuit cooler selection can be
made from the manufacturer’s literature or by contacting the
local representative.
With the increase in brine flow rate, the rise will now be:
Next determine the glycol pressure drop.
Equiv Water Flow = Glycol Flow x Press. Drop Factor
Pressure drop factor can be determined by entering Fig. 22
at the proper concentration of glycol solution (30% by vol-
ume), going to the pressure drop factor line and reading right to
the pressure drop factor. For this example the factor is 1.1.
Equiv Water Flow = 513 x 1.1
= 564 Gpm
Entering condenser water pressure drop curve in product
literature at 564 gpm, the brine pressure drop can be deter-
mined. Note there will be an increase in flow rate and pressure
drop with ethylene glycol as compared to a straight water cool-
ing system.
In conclusion, add a glycol solution to a condenser system
only when conditions warrant. Do not add more than is
required. When glycol is used, proper control of inhibitor
concentration is necessary to maintain design properties of
solution and prevent corrosion.
Glycol Flow Rate =
153 x 33.5
= 513 Gpm
10
Rise =
THR x 24
Gpm
=
153 x 33.5
513
= 10 degrees
70
0
5
15
30 45
% E.G. (BY VOLUME)
1.2
1.1
1.0
PRESSURE DROP FACTOR
-30
-20
60
-10
0
50
40
30
+10
+20
20
+30
0
10
20
30
40
50
% E.G. (BY WEIGHT)
CRYSTALLIZATION POINT
GLYCOL GPM FACTOR
GLYCOL GPM FACTOR
CRYSTALLIZATION POINT
∆P FACTOR
WATER TO GLYCOL FLOW
RATE CORRECTION
NOTES:
1. Determine % concentration at required crystallization point.
2. Determine glycol flow rate (gpm).
3. Determine glycol pressure drop.
Equivalent Water Flow = Glycol Flow x
∆
p Factor
Enter condenser water
∆
p curves at equivalent water flow rate. Result equals glycol
∆
p.
Fig. 22 — Water to Glycol Flow Rate Correction
Glycol Flow =
THR (tons) x Glycol Factor
Rise