Low Loss Header - Viessmann VITODENS 242-F Technical Manual

Design information
Vitosol 200-TM, type SPEA
2
Absorber area in m
1.63
3.03
3.78 and 4.29
Vitosol 300-TM, type SP3C
Absorber area in m 2
1.26 and 1.51
3.03
3.78 and 4.29

Low loss header

See the Vitodens 200-W and 300-W technical guide.
5.6 Sizing the solar thermal system
Influence of orientation, inclination and shade
5
95
65
W
S
Shade reduces the energy yield
Position and size the solar collector array so that the effect of neigh-
bouring buildings, trees, etc. that cast a shade is minimised.
VIESMANN
72
(cont.)
Static head in m System capacity in l
5
10
15
5
10
15
5
10
15
Static head in m System capacity in l
5
10
15
5
10
15
5
10
15
90
100
95
70
65
O
Recom. expansion vessel
capacity in l
25.1
28.1
31.6
29.2
30.1
33.6
31.8
34.9
35.8
Recom. expansion vessel ca-
pacity in l
21.7
25.1
28.6
22.3
25.7
29.2
23.3
23.6
29.8
The yield depends on where the solar collectors are installed. The
highest yields result from south facing, pitched roofs. In comparison,
a roof with east-west orientation achieves only approx. 80 % yield.
Depending on the purpose of the solar thermal system, we recom-
mend the following optimum angles of inclination for the collectors:
■ Solar thermal system for DHW heating
30 to 45º
80
This small collector angle of inclination takes the higher position of
the sun in summer into account.
■ Solar thermal system for central heating backup
45 to 60º
Taking the lower position of the sun in spring, autumn and winter
50
into account.
The deliberately large collector angle of inclination reduces periods
of stagnation in summer.
Recom. heat sink
(see page 70)
25 1.5 m uninsulated pipe
40 —
—
40 Type 21
50 —
—
40 Type 21
50
80 —
Recom. heat sink
(see page 70)
18 —
25
18
25
25 1.5 m uninsulated pipe
—
40 —
VITODENS