ENGLISH
21
EN
8.2. INFORMATION COLLECTOR PIPE
8.3. CONNECTION TO OUTDOOR UNIT
8.4. CONNECTION OF SEvERAL BRINE COILS
!
Local rules and regulations related to type of collector must
be followed.
Borehole collector: Fully welded plastic pipe collector (PEM PN
6.3) according to the applicable local and national regulations with
factory manufactured return bend.
Ground collector: Fully welded plastic pipe collector (PEM PN 10)
according to the applicable local and national regulations.
In countries where frost damage occurs, the collector pipe beside
an outer wall (minimum 2 meters) must be insulated in such a way
that frost damage is prevented. This applies regardless of ground,
rock or lake heat.
Minimum shaft depth between the energy well and the building
is 0.5 m. If burial to that depth is not possible the pipes must be
protected against any external mechanical damage.
Figure 49: Shaft depth for, and insulation of, collector hoses.
Connection for the brine circuit from the heat pump to the outdoor
unit can be carried out using pipes or hoses. Depending on what
connection is selected and what diameter the connection has, there
is a maximum length that the connection may be. The maximum
lengths in the table below are based on ethylene glycol (which is
mixed to anti-freeze protection down to -32°C) at 0°C.
Geysir
Air
Pytg
Calculated maximum coil length between
the HP and outdoor unit, in metres
Size
kPa
Cu22
Øint =
20,0
Cu28
Øint =
25,6
PEM
DN 25
Øint =
21,0
PEM
DN 32
Øint =
28,0
6
30
34
(2 x 17)
133
(2 x 66,5)
48
(2 x 24)
173
(2 x 86,5)
8
63
21
(2 x 10,5)
98
(2 x 49)
30
(2 x 15)
150
(2 x 75)
10
50
11 *
(2 x 5,5)
47
(2 x 23,5)
13 *
(2 x 6,5)
78
(2 x 39)
12
43
5 *
(2 x 2,5)
26
(2 x 13)
8 *
(2 x 4)
44
(2 x 22)
*) Not recommended because of high liquid speeds with risk of
corrosion/ noise problems.
When several brine coils are used for a heat pump installation,
independent of what heat source is used, the length of the coils
must not exceed the values in the following table. The coil lengths
are based on ethanol 30% at 0°C.
For hoses of type PEM DN 32, Øi = 28,0:
Geysir,
Geysir
with
Passive
cooling
Pytg
Calculated maximum coil length per coil, in
metres
PEM DN 32, Øin = 28,0
Size
kPa
1 coils
2 coils
3 coils
4 coils
6
31
182
2 x 443
3 x 620
4 x 775
8
33
94
2 x 220
3 x 471
4 x 660
10
67
129
2 x 419
3 x 670
4 x 1117
12
64
91
2 x 376
3 x 640
4 x 914
16
56
37
2 x 165
3 x 329
4 x 400
For hoses of type PEM DN 40, Øi = 35,2.
Geysir,
Geysir
with
Passive
cooling
Pytg
Calculated maximum coil length per coil, in
metres
PEM DN 40, Øin = 35,2
Size
kPa
1 coils
2 coils
3 coils
4 coils
6
31
517
2 x 775
3 x 1033
4 x 1033
8
33
367
2 x 660
3 x 943
4 x 825
10
67
394
2 x 1340
3 x 1675
4 x 1675
12
64
291*
2 x 1067
3 x 1280
4 x 1600
16
56
119
2 x 560
3 x 933
4 x 1120
*) When dimensioning size 12, a borehole depth that exceeds this
recommendation for coil length is often required. In such cases two
coils should be used.
The different brine coils are distributed form a common collection
well. All return lines are led back to the well and are equipped
with choke valves because the flow of each individual coil must
be adjusted.
Figure 50: The collection well for distributing to several brine coils.
Choke valves with flow indicators (available as accessories from
the Johnson Controls range) are used to adjust the brine flow so
that it is the same in all coils.
If choke valves with flow indicators are not available adjust the
valves until the temperature of all the coil return hoses is the
same.
>0,5m
>2,0m
Collection well
Choke valves
Brine coil 1
Brine coil 2
