Viessmann Vitosol100 - Page 56

3.3Safety equipment
56
VITOSOL
Calculation example
Solar heating system with:
2 Vitosol 100, type s
2.5 @ 2.2litres
Liquid capacity: V
A
=25litres
Static head: h=5m
Permissible final pressure: p
e
=5.4 bar (ü)
(safety valve blow off pressure: 6bar)
V
N
=
(V
v
 V
2
 z  V
k
)  (p
e
 1)
p
e
 p
st
V
v
= V
A
·0.005
V
v
= 0.125 litres, selected 3 litres
(see page55)
V
2
= V
A
·
V
2
= 3.25 litres
p
st
= 1.5 bar + 0.1 bar/m·5 m
p
st
= 2.0 bar
V
N
=
V
N
= 20.05 l
The next largest expansion vessel, i.e.
25litres, should be chosen.
Selection table for MAG expansion vessels, subject to collector type (in conjunction with a 6 bar safety valve)
These details provide only guide values; a final calculation must be carried out.
Vitosol 100, type s
2.5
Number
of
collectors
System
capacity
V
A
litres
Static
head
h
m
Expansion
vessel
*1
capacity
litres
2 20 5
25
10
3 25 5 25
10 40
4 32 5
40
10
5 35 5 40
10 50
Vitosol 100, type w2.5
Number
of
collectors
System
capacity
V
A
litres
Static
head
h
m
Expansion
vessel
*1
capacity
litres
2 20 5 25
10 40
3 30 5
40
10
4 35 5 40
10 50
5 40 5 50
10 80
Vitosol 200
Absorber
surface
area
m
2
System
capacity
V
A
litres
Static
head
h
m
Expansion
vessel
*1
capacity
litres
3 20 5
25
10
4 25 5
40
10
5 30 5
40
10
6 35 5 40
10 50
Vitosol 250
Number
of
collectors
System
capacity
V
A
litres
Static
head
h
m
Expansion
vessel
*1
capacity
litres
3 30 5 40
10 50
4 35 5 50
10 80
5 45 5
80
10
6 50 5
80
10
Vitosol 300
Absorber
surface
area
m
2
System
capacity
V
A
litres
Static
head
h
m
Expansion
vessel
*1
capacity
litres
3 16 5
18
10
4 18 5
18
10
5 23 5 18
10 25
6 25 5
25
10
*1
Expansion vessel from the Viessmann product range (see price list).
5822135 GB
(3l  3.25l  2  2.2l)  (5.4bar  1)
5.4bar  2.0bar