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Chapter 3. Case Study
Table 3.1.: Geometrical and meteorological parameters, and material properties that describe the sewer section RS 4943-RS 3096 in Rümlang. Estimates were made where no data was available. Key
to “Origin” column: IP=implementation plan, E=estimate, AS=ANETZ meteorological station,
L=literature (cf. Appendix B).
Parameter
Symbol
Value
Unit
Origin
Length
L
1845
m
IP
Nominal diameter
D
0.9
m
IP
Wall thickness
s
0.1
m
IP
Sewer slope
S0
0.0091
-
IP
Friction coeff.
kst
70
m1/3 s−1
E
Fouling factor
f
200
W/(m2 K)
L
COD degradation rate
r
0.6-2.8
mgCOD/(m3
Soil penetration depth
δS
0.1
m
E
Air exchange coeff.
b
0.1
-
E
Ambient temperature
TA
8.3
°C
AS
Ambient air pressure
pA
966
mbar
AS
Relative humidity
ϕ
0.75
-
AS
Soil temperature
TS,in f
5.5
°C
M/E
Thermal conductivity pipe
λP
0.3-2.5a
W/(m K)
IP / L
Thermal conductivity soil
λS
0.25-2.5b
W/(m K)
IP / L
Thermal diffusivity pipe
aP
0.4 - 0.6 a
m2 /s
IP / L
aS
b
m2 /s
IP / L
Thermal diffusivity soil
a Reinforced
b Gravel
0.3 - 0.8
concrete
with a porosity of 50% and 50% saturated
s)
L