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Chapter 10
START-UP
DILUTING THE GLYCOL TO THE DESIRED CONCENTRATION
If the use of anti-freeze is envisioned, the water and glycol must be mixed in a container following the
data indicated by the producer and in a way that anti-freeze safety is guaranteed to a temperature of 10 °C
below the average minimum winter temperature. This data must be obtained on the basis of the specifi c
geographical area and is the same used to calculate the design of the heating system.
The volume of water contained inside the system can be measured directly after the washing phase and
sealing check or it can be calculated. The liquid contained inside each panel is equal to 1 litre. The liquid
contained inside the piping can be calculated on the basis of the following table, multiplying the values
by the total length of the pipes.
External diameter and thickness in mm
Dimensions of the pipe
12 x 1
15 x 1
18 x 1
22 x1
28x 1,5
35 x 1,5
Content (l/m)
0,079
0,133
0,201
0,314
0,491
0,804
A heat transfer fl uid is used inside the solar circuit. This transfers the heat absorbed by the solar panel
inside the domestic hot water storage tank.
This fl uid is made up from a mixture of neutral water and TYFOCOR® L anti-freeze liquid, able to protect the
system from the winter’s freezing.
The water used is normal drinking water or de-mineralised water (MAX chlorides 100 mg/kg).
The corresponding concentration and density is stated in the following table and the freezing-resistance
values are indicated in the graphics (fi gure 10.4).
TYFOCOR L
[% v/v]
Freezing
Density
[g/cm
3
]
25
-10°C
1,023
30
-14°C
1,029
35
-17°C
1,033
40
-21°C
1,038
45
-26°C
1,042
50
-32°C
1,045
55
-40°C
1,048
The minimum concentration to keep protection against corrosion complete must be greater than 25%,
while the maximum allowed is 55%.
