Viessmann Vitosol
100 Technical Manual page 56

3.3 Safety equipment
Calculation example
Solar heating system with:
2 Vitosol 100, type s 2.5 @ 2.2 litres
Liquid capacity: V = 25 litres
A
Static head: h = 5 m
Permissible final pressure: p
e
(safety valve blow off pressure: 6 bar)
) V ) z @ V ) @ (p
(V
v e
2 k
V =
* p
N
p
e
st
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 System Static
of capacity head
collectors V h
A
litres m
2 20 5
10
3 25 5
10
4 32 5
10
5 35 5
10
Vitosol 250
Number System Static
of capacity head
collectors V h
A
litres m
3 30 5
10
4 35 5
10
5 45 5
10
6 50 5
10
*1
Expansion vessel from the Viessmann product range (see price list).
56
V = V · 0.005
v A
V = 0.125 litres, selected 3 litres
v
(see page 55)
· b
V = V
2 A
V = 3.25 litres
2
= 5.4 bar (ü) p = 1.5 bar + 0.1 bar/m · 5 m
st
p = 2.0 bar
st
) 1)
(3 l ) 3.25 l ) 2 @ 2.2 l) @ (5.4 bar ) 1)
V =
N
V = 20.05 l
N
Vitosol 100, type w 2.5
Expansion Number
*1
vessel of
capacity collectors
litres
25 2
25 3
40
40 4
40 5
50
Vitosol 300
Expansion Absorber
*1
vessel surface
capacity area
2
litres m
40 3
50
50 4
80
80 5
80 6
5.4 bar * 2.0 bar
System Static Expansion
*1
capacity head vessel
V h capacity
A
litres m litres
20 5 25
10 40
30 5 40
10
35 5 40
10 50
40 5 50
10 80
System Static Expansion
*1
capacity head vessel
V h capacity
A
litres m litres
18
16 5
10
18 5 18
10
23 5 18
10 25
25 5 25
10
The next largest expansion vessel, i.e.
25 litres, should be chosen.
Vitosol 200
Absorber System Static
surface capacity head
area V h
A
2
m litres m
3 20 5
10
4 25 5
10
5 30 5
10
6 35 5
10
VITOSOL
Expansion
*1
vessel
capacity
litres
25
40
40
40
50