MANUALE DI ISTRUZIONI / INSTRUCTION MANUAL
RADIATORI REMOTI / DRY COOLERS
RAN-RAL - Rev 1.0. - 11-10-2002 IT - EN
24 (32)
GUIDE TO THE SIZING OF THE EXPANSION TANK
The project elements to consider when selecting the dimensions of the buffer tank for a system are:
C
The quantity of water in the system in litres
e
the expansion coefficient of the water, calculated as the maximum temperature difference between
when the system is off and when the system is running (the values are given in the table below)
p
i
The absolute initial pressure, equivalent to the pre-charge pressure of the buffer tank (normally 2.5 bar,
i.e. 1.5 bar-r);
p
f
The absolute tolerated pressure, which must be less than the pressure at which the safety valve is set,
taking account of any difference in height between the valve and the tank.
The total capacity of the buffer tank is expressed as:
f
i
t
p
p
e
C
V
−
⋅
=
1
using the expansion coefficient values in the following table.
WATER EXPANSION COEFFICIENT
Water temp.
[°C]
Density
[kg/m
3
]
e
(at 10°C)
10
999.6
-
20
997.9
0.0017
30
995.6
0.0040
40
992.2
0.0075
50
988.1
0.0116
60
983.2
0.0167
70
977.8
0.0223
80
971.8
0.0286
90
965.3
0.0355
100
958.4
0.0430
It is also possible to calculate the average value of ‘
e
’
between the initial water temperature (generally
assumed to be 10°C) and the operating temperature,
using:
(
)
2
6
4
10
5
7
−
⋅
⋅
=
−
T
,
e
T [°C]
CAPACITY OF WATER CIRCUIT
The table below shows the capacity in litres of the water circuit.
RAL
0360
RAL
0510
RAL
0700
RAN
0750
RA**
1000
RA**
1500
RAL
2300
RAL
3600
RAL
5700
litres
6.1
9.8
13.6
12.1
14.2
19.1
-
-
-
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