Technical Manual

Vitosol 200-T, SPE Technical Data

5693 556 v1.0

Design Information

Installation on Flat Roofs

(continued)

Example:

Toronto is approximately located on latitude 43° north.

In the northern hemisphere, this value is calculated as

follows:

Angle β = 90° - 23.5° - latitude

= 90 - 23.5 - 43 =23.5

h = 2260 mm

α = 45°

β = 23.5°

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). 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.

z = sin (180°– (α+β))

h sin β

z = 2260 mm · sin (180° – 68.5°)

sin 23.5°

z = 208 in. (5273 mm)

z = Distance between collector rows

h = Collector height (for dimensions see “Specification”

for the relevant collector)

α = Angle of collector inclination

β = Angle of the sun