Calculating The Opening And Closing Force - G-U ELTRAL K60 24 V Montage- Und Bedienungsanleitung

7

Calculating the opening and closing force

With the formulas listen in the following, you can roughly determine what
NOTE
force is needed to open or close a window.
º
Free-moving windows are assumed. Snow loads, if present, must also be
considered.
The application formula considers only tilt and top-hung windows. The
NOTE
permitted motor force corresponding to the technical specifications can be
º
obtained in chapter 5 on page 21. If the values you achieved lie outside
the technical max. force, check with Gretsch-Unitas.
For vertically installed tilt or top hung windows
Calculation of the motor power dependent on the wind power F
Calculation of the motor power dependent on the sash weight F
09.2013 | G27601 | Printed in Germany
F = 5.4 x P x C / H
g
F = F x A / 2
K W
F = F + F
g K
Wind loads depending on
the building height
Height
F
W
0 - 8 m 500 N/m²
8 - 20 m 800 N/m²
20 - 100 m 1100 N/m²
> 100 m 1300 N/m²
F, F , F = opening and
g K
closing force [N]
P = sash weight [kg]
A = window surface [m²]
H = sash height [mm]
C = opening width [mm]
N
F = wind load [—]
m²
W
5.4 = precalculated constant [—]
W
and wind power F
g
m
s²
W
23