Calculating The Opening And Closing Force - GU ELTRAL Z45 230V Assembly And Operating Instructions Manual

Assembly and operating instructions
ELTRAL Z45 - 230 V
Rack and pinion drive
6

Calculating the opening and closing force

With the formulae indicated below it is possible to determine the
NOTE
approximate force required to open or close a (smooth-running) window.
 
The windows are assumed to be smooth-running. Possible snow loads are to
be considered.
The application formula can be used for bottom-hung windows, top-hung
windows, and skylights only.
NOTE
The permissible drive force is specifi ed in the technical data in section „4
 
Technical data" on page 18.
If the values you calculated exceed the max. allowed force, please contact
Gretsch-Unitas GmbH Baubeschläge
F, F , F = opening/closing force [N]
g K
P = sash weight [kg]
A = window area [m²]
H = sash height [mm]
C = opening width of sash [mm]
F = wind load [—]
w
m²
5.4 = constant calculated in advance [—]
For roof-lights
Calculating the drive force depending on the sash weight P
For vertically installed bottom-hung or top-hung windows
Calculating the drive force depending on the sash weight P
Calculating the drive force depending on the wind load F
Calculating the drive force depending on sash weight and wind load
20
N
m
s²
F = 5.4 x P
F = 5.4 x P x C / H
g
F
K
F= F
Wind loads depending on the
building height
Height
0 - 8 m
8 - 20 m
20 - 100 m
> 100 m
W
= F x A / 2
W
+ F
g K
F
w
500 N/m²
800 N/m²
1100 N/m²
1300 N/m²