Design Information On Flat Roof 16. 1 Determining The Collector Row Clearance Z; Vitosol-F Flat-Plate Collectors (On Supports) - Viessmann VITOSOL 100-F SV Technical Manual

Design information on flat roof installation
16.1 Determining the collector row clearance z
At sunrise and sunset (when the sun is very low), shading cannot be
avoided when collectors are arranged behind one another. To keep
the reduction in yield within acceptable parameters, observe specific
row clearances (dimension z) in accordance with VDI
guideline 6002-1. When the sun is at its highest on the shortest day of
the year (21/12), the rows at the back should be free of shading.
The angle of the sun β (at midday) on 21/12 must be used to calculate
the row clearance.
In Germany, this angle lies between 11.5° (Flensburg) and 19.5° (Kon-
stanz), subject to latitude.
16
h
α
z sin (180° – (α + β))
=
h sinβ
z = Distance between collector rows
h = Collector height (for dimensions see chapter "Specification" for
the relevant collector)
α = Angle of collector inclination
β = Angle of the sun
Example:
Würzburg is approximately located on latitude 50° north.
In the northern hemisphere, this value is deducted from a fixed angle
of 66.5°:
Angle β = 66.5° − 50° = 16.5°

16.2 Vitosol-F flat-plate collectors (on supports)

Observe the information on securing collectors on page 111.
VIESMANN
128
h
α
β
z
Example with Vitosol-F, type SH
h = 1056 mm
α = 45°
β = 16.5°
h · sin (180°– (α+β))
z =
sin β
1056 mm · sin (180°– 61.5°)
z =
sin 16.5°
z = 3268 mm
α Clearance between collector rows z in mm
Vitosol-F
Type SV Type SH
Flensburg
25° 6890 3060
30° 7630 5715
35° 8370 3720
45° 9600 4260
50° 10100 4490
60° 10890 4830
Kassel
25° 5830 2590
30° 6385 2845
35° 6940 3100
45° 7840 3480
50° 8190 3640
60° 8720 3870
Munich
25° 5160 2290
30° 5595 2485
35° 6030 2680
45° 6710 2980
50° 6980 3100
60° 7350 3260
Viessmann offers two collector supports for fixing the collectors:
■ With a variable angle of inclination (snow loads up to
2.55 kN/m 2 , wind speeds up to 150 km/h):
The collector supports are pre-assembled. They consist of the base
rail, collector support and adjustable support with holes for adjusting
the angle of inclination (see the following chapter).
■ With fixed angles of inclination of 30°, 45° and 60° (snow loads up
2
to 1.5 kN/m , wind speeds up to 150 km/h):
Collector supports with footplates (see from page 131).
For this version the angle of inclination is calculated from the dis-
tance between the footplates.
Cross braces are required for 1 to 6 collectors connected side by side
to secure the support.
Vitosol 200-T, Vitosol 200-T,
type SP2A type SPE
Vitosol 300-T,
type SP3B
6686 —
7448 7511
8154 —
9373 9453
9878 —
10660 10750
5446 —
5981 6032
6471 —
7299 7360
7631 —
8119 8187
4862 —
5290 5772
5677 —
6321 6993
6571 —
6921 7737
VITOSOL