Environmental Engineering Reference
In-Depth Information
Table 3.8
Parameters for Commercial Copper Pipes
Name
Outside diameter
Inside
Weight
Capacity
Flow rate in
in mm
diameter in mm
in kg/m
in l/m
l/h (for
υ
p
=1 m/s)
12
1
12
10
0.31
0.079
280
15
1
15
13
0.39
0.133
480
18
1
18
16
0.51
0.201
720
22
1
22
20
0.59
0.314
1130
28
1.5
28
25
1.12
0.491
1770
35
1.5
35
32
1.41
0.804
2900
42
1.5
42
39
1.71
1.195
4300
Source:
DIN, 1996
(3.26)
The necessary pipe diameter
d
P
for a system with a collector area of
A
C
=
= 1 m/s, an area-related mass flow of
m
•
' =
5m
2
, a flow velocity of
v
P
50 kg/(m
2
h)and a density of
= 1060 kg/m
3
is a little less than 10 mm. Table
3.8 shows typical parameters of commercial copper pipes. A 12
ρ
1 copper
pipe with an inner diameter of 10 mm would be suitable for such a system.
In practice, diameters a little larger are chosen. Friction inside the pipes
slows the heat transfer medium and causes pressure losses, which can be
reduced by choosing larger diameters. Tables 3.9 and 3.10 show
recommended
piping lengths
for copper pipes in pumped and thermosyphon systems.
The total piping length is defined by the location of the collector and the
storage tank in most cases. The following section calculates the heat losses for
pipes with a chosen diameter and insulation. Therefore, a distinction is made
between piping heat-up losses and circulation losses.
Table 3.9
Recommended Diameters of Copper Pipes for Pumped Systems
with Mixtures of Water and Antifreeze Agents
Total piping length
Collector area
10 m
20 m
30 m
40 m
50 m
below 5 m
2
15
1
15
1
15
1
15
1
15
1
6-12 m
2
18
1
18
1
18
1
18
1
22
1
13-16 m
2
18
1
22
1
22
1
22
1
22
1
17-20 m
2
22
1
22
1
22
1
22
1
22
1
21-25 m
2
22
1
22
1
22
1
22
1
28
1.5
26-30 m
2
22
1
22
1
28
1.5
28
1.5
28
1.5
Source:
Wagner & Co, 1995
