Adjust system pressure
In the case of switching collectors Vitosol-FM and Vitosol 300-TM,
the system pressure in the collector must be approx. 3.0 bar.
Pressure maintaining facility
Vitosol-F
Vitosol 200-TM
Vitosol-FM
Vitosol 300-TM
System pressure
A
1 bar 3 bar
Pressure conditions calculation examples
System height from upper collector edge to pressure gauge of
10 m
System operating pressure
System pressure
A at highest point
1 bar 3 bar
Supplement per
metre of static
head
B
, here
10 m
+ 0.1 bar/m = 1 bar + 0.1 bar/m = 1 bar
System operating
pressure P
(pressure gauge)
2 bar 4 bar
Charge pressure
System operating
pressure
2 bar 4.0 bar
Pressure reserve
for venting
+ 0.1 bar + 0.1 bar
Charge pressure 2.1 bar 4.1 bar
Pre-charge pressure, expansion vessel
System operating
pressure
2 bar 4.0 bar
Deduction for hy-
draulic seal
–0.3 bar –0.3 bar
Supplement per
metre of height dif-
ference
C
be-
tween pressure
gauge and expan-
sion vessel
+ 0.1 bar x 1 m = 0.1
bar
+ 0.1 bar x 1 m = 0.1
bar
Expansion vessel
pre-charge pres-
sure
D
1.8 bar 3.8 bar
Expansion vessel
For layout, function and specification of the expansion vessel, see
chapter "Installation accessories".
The expansion vessel can be calculated once the steam spread has
been determined and any heat sinks that may be used have been
taken into consideration.
The required volume is determined by the following factors:
■ Expansion of the heat transfer medium in its liquid state
■ Liquid seal
Information regarding design and operation
(cont.)
VITOSOL
VIESMANN
135
5822 440 GB
13
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