Siemens FDL241-9 - Page 46

Planning
4
Installation surface
46
Building Technologies 007016_i_en_--
Fire Safety 2012-09-07
Calculating the lengthwise expansion of the roof Δl:
Δ
l = l ×× ΔT
α = 80000 mm
×
40 K
×
= 38.4 mm0.000012
K
-1
Calculating the angle β:
β = arctan
h
Δl
= arctan
4000 mm
38.4 mm
= 0.55°
Calculating the deflection c:
= β c tan × l
= tan (0.55)
×
80 m = 0.77 m
The deflection c is 0.77 m.
DLRFDL
Possible solution: Install the detector on the stable surface and install the reflector on the
unstable wall