GLYCOL SOLUTIONS
The system glycol capacity, glycol solution flow rate in gpm,
Test coolant with a clean accurate glycol solution hydrometer
and pressure drop through the cooler may be calculated
us-
(similar to that found in service stations) to determine freez-
ing the following formulas and table.
ing point. Then obtain percent glycol from the freezing point
CAPACITY
-
Capacity is reduced from that with plain
water. To find the reduced value multiply the chiller’s water
system tonnage by the capacity correction factor C to find
the chiller’s capacity in the glycol system.
GPM -To determine gpm (or
/I
T)
knowing
n
T (or gpm)
and tons:
Glvcol
gp:pm
=
24
x
Tons
(WW
,
AT
x G (from table)
PRESSURE DROP -To determine glycol pressure drop
through the cooler, enter the water pressure drop graph
on page 9 at the glycol gpm. Multiply the water pressure
drop found there by P to obtain corrected glycol pressure
drop.
table below.
0
1
32°F
1
1.000
j
1.000
1
1.00
1
1.00
10
1
24'F
1
0.990
/
0.994
1
1.01
1
1.06
20
15'F
0.981
'
0.988
1.04
1.12
30
4°F 0.974
0.984
1.08
1.18
40
-12°F 0.968
0.981 1.13
1.24
50
-33°F 0.964
0.980
1.20
1.30
CONDENSER
-
The use of a glycol solution in the heat
recovery condensers will not affect heat recovery capacity.
PERCENT BY VOLUME
lb
i0
3b
4-o
% ETHYLENE GLYCOL BY WEIGHT
1.30
1.25
1.20
100
Page 8
I
IM
508
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