EN
11_11. 6755532_02
•
input power take into account the presence of
•
-
• -
with the absence of glycol.
NOTE
On the following page an example is given to help
graph reading. Using the diagram below it is possible to
determine the percentage of glycol required; this per-
centage can be calculated by taking of the following
factors into consideration one:
the graph is interpreted by the right or left side at the
crossing point on the curves with the external tempe-
rature line or the water produced line. A point from
which the vertical line will pass is obtained and this will
distinguish both glycol percentage and relative correc-
tion coefficients.
The curves shown in the diagram summarise a signifi-
cant number of data, each of which is represented by a
specific curve. In order to use these curves correctly it
is first necessary to make some initial reflections.
1. If you wish to calculate the percentage of glycol
on the basis of the external air temperature, en-
all the other curves; the points obtained from
recommended to produce desired water tempe-
rature is on the lower axis.
2. If you wish to calculate the percentage of glycol
on the basis of the temperature of the water
produced, enter from the right axis and on rea-
will intercept all the other curves; the points ob-
tained from the upper curves represent the coef-
3. -
mends the glycol percentage value necessary to
produce water at the desired temperature.
KEY:
Pc Corrective factors for cooling capacity
Pe Corrective factors of the input power
Ph Corrective factors of heating capacity
D
D
D
D
D
2.20
2 .10
2.00
1.90
1.80
1.70
1.60
1.50
1.40
1.30
1.20
1.10
1.00
0.99
0.98
0.97
0.96
0.95
0.94
5
0
-5
-10
- 15
-20
-25
-30
-35
-40
41
32
23
14
5
-4
- 13
-22
-31
-40
(°C)
(°F)
0 5 10 15 20
25
30 35 40 45 50 55
-6
0
5
21. 2
32.0
41. 0
0.975
0.990
1.000
1.090
1.11 0
1.18 0
1.280
1.310
1.390
-3
Pc
Ph
Qw (2)
Qw (1)
∆P (5)
∆P (4)
∆P (3)
∆P (2)
∆P (1)
Pe
(°C)
(°F)
Correction factors
% Glycol
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