mcs 022: ground heat exchanger look-up tables
TRANSCRIPT
Issue 1.0 (02/09/2011)
!
This Microgeneration Installation Standard is the property of Department of Energy and Climate Change (DECC), 3 Whitehall Place, London,SW1A 2HH.© DECC 2008
MCS 022: GROUND HEAT EXCHANGER LOOK-UP TABLES
SUPPLEMENTARY MATERIAL TO MIS 3005
Issue 1.0
1
!
Issue 1.0 (02/09/2011)
This standard has been approved by the Steering Group of the MCS.
This standard was prepared by the MCS Working Group 6 ‘Heat Pumps’.
REVISION OF MICROGENERATION INSTALLATION STANDARDS Microgeneration Installation Standards will be revised by issue of revised editions or a m e n d m e n t s . D e t a i l s w i l l b e p o s t e d o n t h e w e b s i t e a t www.microgenerationcertification.org
Technical or other changes which affect the requirements for the approval or certification of the product or service will result in a new issue. Minor or administrative changes (e.g. corrections of spelling and typographical errors, changes to address and copyright details, the addition of notes for clarification etc.) may be made as amendments.
The issue number will be given in decimal format with the integer part giving the issue number and the fractional part giving the number of amendments (e.g. Issue 3.2 indicates that the document is at Issue 3 with 2 amendments).
Users of this Standard should ensure that they possess the latest issue and all amendments.
2
Issue 1.0 (02/09/2011)
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.......................................................................................................................................1. BOREHOLE HEAT EXCHANGERS 41200 FLEQ run hours 51800 FLEQ run hours 62400 FLEQ run hours 73000 FLEQ run hours 83600 FLEQ run hours 9
2. HORIZONTAL GROUND HEAT EXCHANGERS 101200 FLEQ run hours 111800 FLEQ run hours 122400 FLEQ run hours 133000 FLEQ run hours 143600 FLEQ run hours 15
3. SLINKY GROUND HEAT EXCHANGERS 161200 FLEQ run hours 171800 FLEQ run hours 182400 FLEQ run hours 193000 FLEQ run hours 203600 FLEQ run hours 21
4. AMENDMENTS ISSUED SINCE PUBLICATION 22
TABLE OF CONTENTS
3
Issue 1.0 (02/09/2011)
1. BOREHOLE HEAT EXCHANGERS
4
Issue 1.0 (02/09/2011)
5.0
4.0
3.0
2.0
1.0
Ave
rage
gro
un
d t
he
rmal
co
nd
uct
ivit
y (
W/m
/K)
Mean ground temperature (oC)6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0
NE
Sco
tland
NW
Sco
tland
E S
cotla
nd
Bor
ders
W S
cotla
nd
Nor
ther
n Ire
land
Nor
th-e
aste
rnN
orth
-wes
tern
Mid
land
sW
ales
E P
enni
nes
W P
enni
nes
Eas
t Ang
liaS
outh
-eas
tern
Sou
ther
n
Sev
ern
Valle
y
Sou
th-w
este
rn
Tham
es V
alle
y
Mean annual air temperature for UK regions (oC)
21
37
33
28
24
41
37
32
27
47
42
36
30
52
47
40
33
57
51
43
36
62
56
47
39
67
61
51
42
72
65
55
45
77
69
59
Maximum power to be extracted per unit length of borehole heat exchanger (W/m) with 1200 FLEQ run hours
Conditions for use:Heat extraction only (inc. hot water)
6m minimum borehole spacing. Only valid for boreholes arranged in a line; not applicable for a large number of systems in a small areaTable created assuming: 130mm borehole diameter; single U-tube; 32mm OD SDR-11, PE100 pipe with thermal conductivity = 0.420W/m/K; 52mm pipe centre-pipe centre
shank spacing; 25% Mono Ethylene Gylcol thermal transfer fluid; Re > 2500 in the borehole active elements; thermally enhanced grout with thermal conductivity = 2.4W/m/KAssumptions result in borehole thermal resistance = 0.1 m.K/W at 12oC mean ground temp. and 2.5W/m/K average ground thermal conductivity
Re
com
me
nd
ed
val
ue
s an
d r
an
ges
of
the
rmal
co
nd
uct
ivit
y
for
dif
fere
nt
rock
typ
es
(W/m
/K)
48
83
74
63
0.5
Cla
y/si
lt (d
ry)
3.4
Gra
nite
0.4
Sand
(dr
y)
2.4
Sand
(w
ater
-sat
urat
ed)
Cla
y/si
lt (w
ater
-sat
urat
ed)
1.7
Cla
ysto
ne, s
iltst
one
(inc.
slat
es a
nd s
hale
s)
2.2
Sand
ston
e
2.3
5
Issue 1.0 (02/09/2011)
5.0
4.0
3.0
2.0
1.0
Ave
rage
gro
un
d t
he
rmal
co
nd
uct
ivit
y (
W/m
/K)
Mean ground temperature (oC)6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0
NE
Sco
tland
NW
Sco
tland
E S
cotla
nd
Bor
ders
W S
cotla
nd
Nor
ther
n Ire
land
Nor
th-e
aste
rnN
orth
-wes
tern
Mid
land
sW
ales
E P
enni
nes
W P
enni
nes
Eas
t Ang
liaS
outh
-eas
tern
Sou
ther
n
Sev
ern
Valle
y
Sou
th-w
este
rn
Tham
es V
alle
y
Mean annual air temperature for UK regions (oC)
18
34
30
25
21
38
34
28
24
43
38
32
26
48
42
35
29
52
47
39
31
57
51
42
34
62
55
46
36
67
59
49
39
72
63
53
Re
com
me
nd
ed
val
ue
s an
d r
an
ges
of
the
rmal
co
nd
uct
ivit
y
for
dif
fere
nt
rock
typ
es
(W/m
/K)
41
77
68
56
0.5
Cla
y/si
lt (d
ry)
3.4
Gra
nite
0.4
Sand
(dr
y)
2.4
Sand
(w
ater
-sat
urat
ed)
Cla
y/si
lt (w
ater
-sat
urat
ed)
1.7
Cla
ysto
ne, s
iltst
one
(inc.
slat
es a
nd s
hale
s)
2.2
Sand
ston
e
2.3
6
Maximum power to be extracted per unit length of borehole heat exchanger (W/m) with 1800 FLEQ run hours
Conditions for use:Heat extraction only (inc. hot water)
6m minimum borehole spacing. Only valid for boreholes arranged in a line; not applicable for a large number of systems in a small areaTable created assuming: 130mm borehole diameter; single U-tube; 32mm OD SDR-11, PE100 pipe with thermal conductivity = 0.420W/m/K; 52mm pipe centre-pipe centre
shank spacing; 25% Mono Ethylene Gylcol thermal transfer fluid; Re > 2500 in the borehole active elements; thermally enhanced grout with thermal conductivity = 2.4W/m/KAssumptions result in borehole thermal resistance = 0.1 m.K/W at 12oC mean ground temp. and 2.5W/m/K average ground thermal conductivity
Issue 1.0 (02/09/2011)
5.0
4.0
3.0
2.0
1.0
Ave
rage
gro
un
d t
he
rmal
co
nd
uct
ivit
y (
W/m
/K)
Mean ground temperature (oC)6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0
NE
Sco
tland
NW
Sco
tland
E S
cotla
nd
Bor
ders
W S
cotla
nd
Nor
ther
n Ire
land
Nor
th-e
aste
rnN
orth
-wes
tern
Mid
land
sW
ales
E P
enni
nes
W P
enni
nes
Eas
t Ang
liaS
outh
-eas
tern
Sou
ther
n
Sev
ern
Valle
y
Sou
th-w
este
rn
Tham
es V
alle
y
Mean annual air temperature for UK regions (oC)
16
31
27
22
18
35
31
25
21
40
35
29
23
44
39
32
25
48
43
35
27
53
46
38
30
57
50
41
32
62
54
44
34
66
58
47
Re
com
me
nd
ed
val
ue
s an
d r
an
ges
of
the
rmal
co
nd
uct
ivit
y
for
dif
fere
nt
rock
typ
es
(W/m
/K)
37
71
62
51
0.5
Cla
y/si
lt (d
ry)
3.4
Gra
nite
0.4
Sand
(dr
y)
2.4
Sand
(w
ater
-sat
urat
ed)
Cla
y/si
lt (w
ater
-sat
urat
ed)
1.7
Cla
ysto
ne, s
iltst
one
(inc.
slat
es a
nd s
hale
s)
2.2
Sand
ston
e
2.3
7
Maximum power to be extracted per unit length of borehole heat exchanger (W/m) with 2400 FLEQ run hours
Conditions for use:Heat extraction only (inc. hot water)
6m minimum borehole spacing. Only valid for boreholes arranged in a line; not applicable for a large number of systems in a small areaTable created assuming: 130mm borehole diameter; single U-tube; 32mm OD SDR-11, PE100 pipe with thermal conductivity = 0.420W/m/K; 52mm pipe centre-pipe centre
shank spacing; 25% Mono Ethylene Gylcol thermal transfer fluid; Re > 2500 in the borehole active elements; thermally enhanced grout with thermal conductivity = 2.4W/m/KAssumptions result in borehole thermal resistance = 0.1 m.K/W at 12oC mean ground temp. and 2.5W/m/K average ground thermal conductivity
Issue 1.0 (02/09/2011)
5.0
4.0
3.0
2.0
1.0
Ave
rage
gro
un
d t
he
rmal
co
nd
uct
ivit
y (
W/m
/K)
Mean ground temperature (oC)6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0
NE
Sco
tland
NW
Sco
tland
E S
cotla
nd
Bor
ders
W S
cotla
nd
Nor
ther
n Ire
land
Nor
th-e
aste
rnN
orth
-wes
tern
Mid
land
sW
ales
E P
enni
nes
W P
enni
nes
Eas
t Ang
liaS
outh
-eas
tern
Sou
ther
n
Sev
ern
Valle
y
Sou
th-w
este
rn
Tham
es V
alle
y
Mean annual air temperature for UK regions (oC)
14
29
25
20
16
32
28
23
18
37
32
26
21
41
36
29
23
45
39
32
25
49
43
35
27
53
46
38
29
58
50
40
31
62
53
43
Re
com
me
nd
ed
val
ue
s an
d r
an
ges
of
the
rmal
co
nd
uct
ivit
y
for
dif
fere
nt
rock
typ
es
(W/m
/K)
33
66
57
46
0.5
Cla
y/si
lt (d
ry)
3.4
Gra
nite
0.4
Sand
(dr
y)
2.4
Sand
(w
ater
-sat
urat
ed)
Cla
y/si
lt (w
ater
-sat
urat
ed)
1.7
Cla
ysto
ne, s
iltst
one
(inc.
slat
es a
nd s
hale
s)
2.2
Sand
ston
e
2.3
8
Maximum power to be extracted per unit length of borehole heat exchanger (W/m) with 3000 FLEQ run hours
Conditions for use:Heat extraction only (inc. hot water)
6m minimum borehole spacing. Only valid for boreholes arranged in a line; not applicable for a large number of systems in a small areaTable created assuming: 130mm borehole diameter; single U-tube; 32mm OD SDR-11, PE100 pipe with thermal conductivity = 0.420W/m/K; 52mm pipe centre-pipe centre
shank spacing; 25% Mono Ethylene Gylcol thermal transfer fluid; Re > 2500 in the borehole active elements; thermally enhanced grout with thermal conductivity = 2.4W/m/KAssumptions result in borehole thermal resistance = 0.1 m.K/W at 12oC mean ground temp. and 2.5W/m/K average ground thermal conductivity
Issue 1.0 (02/09/2011)
5.0
4.0
3.0
2.0
1.0
Ave
rage
gro
un
d t
he
rmal
co
nd
uct
ivit
y (
W/m
/K)
Mean ground temperature (oC)6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0
NE
Sco
tland
NW
Sco
tland
E S
cotla
nd
Bor
ders
W S
cotla
nd
Nor
ther
n Ire
land
Nor
th-e
aste
rnN
orth
-wes
tern
Mid
land
sW
ales
E P
enni
nes
W P
enni
nes
Eas
t Ang
liaS
outh
-eas
tern
Sou
ther
n
Sev
ern
Valle
y
Sou
th-w
este
rn
Tham
es V
alle
y
Mean annual air temperature for UK regions (oC)
14
29
25
20
16
32
28
23
18
37
32
26
21
41
35
29
22
45
39
32
24
49
43
34
26
53
46
37
28
57
49
40
30
61
53
43
Re
com
me
nd
ed
val
ue
s an
d r
an
ges
of
the
rmal
co
nd
uct
ivit
y
for
dif
fere
nt
rock
typ
es
(W/m
/K)
32
66
57
46
0.5
Cla
y/si
lt (d
ry)
3.4
Gra
nite
0.4
Sand
(dr
y)
2.4
Sand
(w
ater
-sat
urat
ed)
Cla
y/si
lt (w
ater
-sat
urat
ed)
1.7
Cla
ysto
ne, s
iltst
one
(inc.
slat
es a
nd s
hale
s)
2.2
Sand
ston
e
2.3
9
Maximum power to be extracted per unit length of borehole heat exchanger (W/m) with 3600 FLEQ run hours
Conditions for use:Heat extraction only (inc. hot water)
6m minimum borehole spacing. Only valid for boreholes arranged in a line; not applicable for a large number of systems in a small areaTable created assuming: 130mm borehole diameter; single U-tube; 32mm OD SDR-11, PE100 pipe with thermal conductivity = 0.420W/m/K; 52mm pipe centre-pipe centre
shank spacing; 25% Mono Ethylene Gylcol thermal transfer fluid; Re > 2500 in the borehole active elements; thermally enhanced grout with thermal conductivity = 2.4W/m/KAssumptions result in borehole thermal resistance = 0.1 m.K/W at 12oC mean ground temp. and 2.5W/m/K average ground thermal conductivity
Issue 1.0 (02/09/2011)
2. HORIZONTAL GROUND HEAT EXCHANGERS
10
Issue 1.0 (02/09/2011)
Mean ground temperature (oC)6.0 7.0 8.0 9.0 10.0 11.0 12.0
NE
Sco
tland
NW
Sco
tland
E S
cotla
nd
Bor
ders
W S
cotla
nd
Nor
ther
n Ire
land
Nor
th-e
aste
rnN
orth
-wes
tern
Mid
land
sW
ales
E P
enni
nes
W P
enni
nes
Eas
t Ang
liaS
outh
-eas
tern
Sou
ther
n
Sev
ern
Valle
y
Sou
th-w
este
rn
Tham
es V
alle
y
Mean annual air temperature for UK regions (oC)
11
12
14
17
17
20
20
24
22
28
25
31
28
34
4.3
12
8.7
5.3
15
11
6.5
19
14
7.5
22
16
8.6
25
19
9.7
28
21
10
31
23
6.5 8.0 10 12 14 16 17
3.2
2.0
0.8
Gro
un
d t
he
rmal
co
nd
uct
ivit
y (
W/m
/K)
4.0
2.8
1.2
2.4
0.4
1.6
3.6
0.50.4
2.4
Sand
(w
ater
-sat
urat
ed)
Cla
y/si
lt (d
ry)
Sand
(dr
y)
1.7
Cla
y/si
lt (w
ater
-sat
urat
ed)
Re
com
me
nd
ed
val
ue
s an
d r
an
ges
of
the
rmal
co
nd
uct
ivit
y
for
dif
fere
nt
rock
typ
es
(W/m
/K)
Maximum power to be extracted per unit length of horizontal ground heat exchanger (W/m) with 1200 FLEQ run hours
Conditions for use:Heat extraction only (inc. hot water)
0.75m minimum pipe spacing (d > 0.75m)Pipe depth between 0.8m and 1.2m
Table created assuming 25mm OD SDR 11 pipeTable created assuming a relationship between the mean monthly temperature swing and annual mean ground temperature
11
Issue 1.0 (02/09/2011)
Mean ground temperature (oC)6.0 7.0 8.0 9.0 10.0 11.0 12.0
NE
Sco
tland
NW
Sco
tland
E S
cotla
nd
Bor
ders
W S
cotla
nd
Nor
ther
n Ire
land
Nor
th-e
aste
rnN
orth
-wes
tern
Mid
land
sW
ales
E P
enni
nes
W P
enni
nes
Eas
t Ang
liaS
outh
-eas
tern
Sou
ther
n
Sev
ern
Valle
y
Sou
th-w
este
rn
Tham
es V
alle
y
Mean annual air temperature for UK regions (oC)
7.7
9.5
10
13
12
15
14
18
16
21
18
23
20
26
2.8
8.7
6.2
3.4
11
7.9
4.2
14
9.7
4.9
16
11
5.6
19
13
6.3
20
15
6.8
23
16
4.5 5.5 6.9 8.1 9.4 11 12
3.2
2.0
0.8
Gro
un
d t
he
rmal
co
nd
uct
ivit
y (
W/m
/K)
4.0
2.8
1.2
2.4
0.4
1.6
3.6
0.50.4
2.4
Sand
(w
ater
-sat
urat
ed)
Cla
y/si
lt (d
ry)
Sand
(dr
y)
1.7
Cla
y/si
lt (w
ater
-sat
urat
ed)
Re
com
me
nd
ed
val
ue
s an
d r
an
ges
of
the
rmal
co
nd
uct
ivit
y
for
dif
fere
nt
rock
typ
es
(W/m
/K)
Maximum power to be extracted per unit length of horizontal ground heat exchanger (W/m) with 1800 FLEQ run hours
Conditions for use:Heat extraction only (inc. hot water)
0.75m minimum pipe spacing (d > 0.75m)Pipe depth between 0.8m and 1.2m
Table created assuming 25mm OD SDR 11 pipeTable created assuming a relationship between the mean monthly temperature swing and annual mean ground temperature
12
Issue 1.0 (02/09/2011)
Mean ground temperature (oC)6.0 7.0 8.0 9.0 10.0 11.0 12.0
NE
Sco
tland
NW
Sco
tland
E S
cotla
nd
Bor
ders
W S
cotla
nd
Nor
ther
n Ire
land
Nor
th-e
aste
rnN
orth
-wes
tern
Mid
land
sW
ales
E P
enni
nes
W P
enni
nes
Eas
t Ang
liaS
outh
-eas
tern
Sou
ther
n
Sev
ern
Valle
y
Sou
th-w
este
rn
Tham
es V
alle
y
Mean annual air temperature for UK regions (oC)
6.0
7.6
7.7
10
9.4
12
11
14
12
16
14
18
15
20
2.1
6.9
4.7
2.5
9.0
6.0
3.1
11
7.4
3.6
13
8.7
4.1
14
10
4.6
16
11
5.0
18
12
3.4 4.2 5.2 6.1 7.1 8.2 8.8
3.2
2.0
0.8
Gro
un
d t
he
rmal
co
nd
uct
ivit
y (
W/m
/K)
4.0
2.8
1.2
2.4
0.4
1.6
3.6
0.50.4
2.4
Sand
(w
ater
-sat
urat
ed)
Cla
y/si
lt (d
ry)
Sand
(dr
y)
1.7
Cla
y/si
lt (w
ater
-sat
urat
ed)
Re
com
me
nd
ed
val
ue
s an
d r
an
ges
of
the
rmal
co
nd
uct
ivit
y
for
dif
fere
nt
rock
typ
es
(W/m
/K)
Maximum power to be extracted per unit length of horizontal ground heat exchanger (W/m) with 2400 FLEQ run hours
Conditions for use:Heat extraction only (inc. hot water)
0.75m minimum pipe spacing (d > 0.75m)Pipe depth between 0.8m and 1.2m
Table created assuming 25mm OD SDR 11 pipeTable created assuming a relationship between the mean monthly temperature swing and annual mean ground temperature
13
Issue 1.0 (02/09/2011)
Mean ground temperature (oC)6.0 7.0 8.0 9.0 10.0 11.0 12.0
NE
Sco
tland
NW
Sco
tland
E S
cotla
nd
Bor
ders
W S
cotla
nd
Nor
ther
n Ire
land
Nor
th-e
aste
rnN
orth
-wes
tern
Mid
land
sW
ales
E P
enni
nes
W P
enni
nes
Eas
t Ang
liaS
outh
-eas
tern
Sou
ther
n
Sev
ern
Valle
y
Sou
th-w
este
rn
Tham
es V
alle
y
Mean annual air temperature for UK regions (oC)
4.9
6.3
6.2
8.3
7.6
10
8.8
12
10
14
11
15
12
17
1.6
5.7
3.8
1.9
7.4
4.8
2.4
8.9
5.9
2.8
10
6.9
3.2
12
8.0
3.6
13
9.0
3.9
15
9.9
2.7 3.3 4.1 4.8 5.6 6.5 6.9
3.2
2.0
0.8
Gro
un
d t
he
rmal
co
nd
uct
ivit
y (
W/m
/K)
4.0
2.8
1.2
2.4
0.4
1.6
3.6
0.50.4
2.4
Sand
(w
ater
-sat
urat
ed)
Cla
y/si
lt (d
ry)
Sand
(dr
y)
1.7
Cla
y/si
lt (w
ater
-sat
urat
ed)
Re
com
me
nd
ed
val
ue
s an
d r
an
ges
of
the
rmal
co
nd
uct
ivit
y
for
dif
fere
nt
rock
typ
es
(W/m
/K)
Maximum power to be extracted per unit length of horizontal ground heat exchanger (W/m) with 3000 FLEQ run hours
Conditions for use:Heat extraction only (inc. hot water)
0.75m minimum pipe spacing (d > 0.75m)Pipe depth between 0.8m and 1.2m
Table created assuming 25mm OD SDR 11 pipeTable created assuming a relationship between the mean monthly temperature swing and annual mean ground temperature
14
Issue 1.0 (02/09/2011)
Mean ground temperature (oC)6.0 7.0 8.0 9.0 10.0 11.0 12.0
NE
Sco
tland
NW
Sco
tland
E S
cotla
nd
Bor
ders
W S
cotla
nd
Nor
ther
n Ire
land
Nor
th-e
aste
rnN
orth
-wes
tern
Mid
land
sW
ales
E P
enni
nes
W P
enni
nes
Eas
t Ang
liaS
outh
-eas
tern
Sou
ther
n
Sev
ern
Valle
y
Sou
th-w
este
rn
Tham
es V
alle
y
Mean annual air temperature for UK regions (oC)
4.2
5.4
5.3
7.2
6.3
8.7
7.3
10
8.3
11
9.1
13
10
14
1.4
4.8
3.2
1.6
6.4
4.1
2.0
7.6
4.9
2.3
8.8
5.7
2.5
9.9
6.5
2.9
11
7.2
3.2
12
7.9
2.3 2.8 3.4 3.9 4.5 5.1 5.6
3.2
2.0
0.8
Gro
un
d t
he
rmal
co
nd
uct
ivit
y (
W/m
/K)
4.0
2.8
1.2
2.4
0.4
1.6
3.6
0.50.4
2.4
Sand
(w
ater
-sat
urat
ed)
Cla
y/si
lt (d
ry)
Sand
(dr
y)
1.7
Cla
y/si
lt (w
ater
-sat
urat
ed)
Re
com
me
nd
ed
val
ue
s an
d r
an
ges
of
the
rmal
co
nd
uct
ivit
y
for
dif
fere
nt
rock
typ
es
(W/m
/K)
Maximum power to be extracted per unit length of horizontal ground heat exchanger (W/m) with 3600 FLEQ run hours
Conditions for use:Heat extraction only (inc. hot water)
0.75m minimum pipe spacing (d > 0.75m)Pipe depth between 0.8m and 1.2m
Table created assuming 25mm OD SDR 11 pipeTable created assuming a relationship between the mean monthly temperature swing and annual mean ground temperature
15
Issue 1.0 (02/09/2011)
3. SLINKY GROUND HEAT EXCHANGERS
16
Issue 1.0 (02/09/2011)
Maximum power to be extracted per unit length of slinky ground heat exchanger trench (W/m) with 1200 FLEQ run hours
Conditions for use:Heat extraction only (inc. hot water)
3m minimum trench spacing (d ≥ 3m)Mean slinky depth between 0.8m and 1.2m
Table created assuming 32mm OD SDR 11 pipePipe length to trench length ratio, Rpt ≥ 4. For a 900mm slinky diameter this corresponds to a maximum 1250mm slinky pitch Table created assuming a relationship between the mean monthly temperature swing and annual mean ground temperature
Mean ground temperature (oC)6.0 7.0 8.0 9.0 10.0 11.0 12.0
NE
Sco
tland
NW
Sco
tland
E S
cotla
nd
Bor
ders
W S
cotla
nd
Nor
ther
n Ire
land
Nor
th-e
aste
rnN
orth
-wes
tern
Mid
land
sW
ales
E P
enni
nes
W P
enni
nes
Eas
t Ang
liaS
outh
-eas
tern
Sou
ther
n
Sev
ern
Valle
y
Sou
th-w
este
rn
Tham
es V
alle
y
Mean annual air temperature for UK regions (oC)
40
49
50
62
59
74
68
86
77
97
85
107
93
118
15
45
32
18
57
40
22
67
48
25
78
55
28
87
63
32
96
70
34
106
77
24 29 35 40 46 52 56
3.2
2.0
0.8
Gro
un
d t
he
rmal
co
nd
uct
ivit
y (
W/m
/K)
4.0
2.8
1.2
2.4
0.4
1.6
3.6
0.50.4
2.4
Sand
(w
ater
-sat
urat
ed)
Cla
y/si
lt (d
ry)
Sand
(dr
y)
1.7
Cla
y/si
lt (w
ater
-sat
urat
ed)
Re
com
me
nd
ed
val
ue
s an
d r
an
ges
of
the
rmal
co
nd
uct
ivit
y
for
dif
fere
nt
rock
typ
es
(W/m
/K)
17
Issue 1.0 (02/09/2011)
Maximum power to be extracted per unit length of slinky ground heat exchanger trench (W/m) with 1800 FLEQ run hours
Conditions for use:Heat extraction only (inc. hot water)
3m minimum trench spacing (d ≥ 3m) Mean slinky depth between 0.8m and 1.2m
Table created assuming 32mm OD SDR 11 pipePipe length to trench length ratio, Rpt ≥ 4. For a 900mm slinky diameter this corresponds to a maximum 1250mm slinky pitch Table created assuming a relationship between the mean monthly temperature swing and annual mean ground temperature
Mean ground temperature (oC)6.0 7.0 8.0 9.0 10.0 11.0 12.0
NE
Sco
tland
NW
Sco
tland
E S
cotla
nd
Bor
ders
W S
cotla
nd
Nor
ther
n Ire
land
Nor
th-e
aste
rnN
orth
-wes
tern
Mid
land
sW
ales
E P
enni
nes
W P
enni
nes
Eas
t Ang
liaS
outh
-eas
tern
Sou
ther
n
Sev
ern
Valle
y
Sou
th-w
este
rn
Tham
es V
alle
y
Mean annual air temperature for UK regions (oC)
28
35
34
45
41
53
47
61
52
69
58
76
63
84
9.8
32
22
11
40
27
14
47
32
16
54
37
18
61
42
20
67
47
21
73
51
16 19 23 26 30 34 36
3.2
2.0
0.8
Gro
un
d t
he
rmal
co
nd
uct
ivit
y (
W/m
/K)
4.0
2.8
1.2
2.4
0.4
1.6
3.6
0.50.4
2.4
Sand
(w
ater
-sat
urat
ed)
Cla
y/si
lt (d
ry)
Sand
(dr
y)
1.7
Cla
y/si
lt (w
ater
-sat
urat
ed)
Re
com
me
nd
ed
val
ue
s an
d r
an
ges
of
the
rmal
co
nd
uct
ivit
y
for
dif
fere
nt
rock
typ
es
(W/m
/K)
18
Issue 1.0 (02/09/2011)
Maximum power to be extracted per unit length of slinky ground heat exchanger trench (W/m) with 2400 FLEQ run hours
Conditions for use:Heat extraction only (inc. hot water)
3m minimum trench spacing (d ≥ 3m)Mean slinky depth between 0.8m and 1.2m
Table created assuming 32mm OD SDR 11 pipePipe length to trench length ratio, Rpt ≥ 4. For a 900mm slinky diameter this corresponds to a maximum 1250mm slinky pitch Table created assuming a relationship between the mean monthly temperature swing and annual mean ground temperature
Mean ground temperature (oC)6.0 7.0 8.0 9.0 10.0 11.0 12.0
NE
Sco
tland
NW
Sco
tland
E S
cotla
nd
Bor
ders
W S
cotla
nd
Nor
ther
n Ire
land
Nor
th-e
aste
rnN
orth
-wes
tern
Mid
land
sW
ales
E P
enni
nes
W P
enni
nes
Eas
t Ang
liaS
outh
-eas
tern
Sou
ther
n
Sev
ern
Valle
y
Sou
th-w
este
rn
Tham
es V
alle
y
Mean annual air temperature for UK regions (oC)
21
27
26
34
30
40
35
47
39
52
43
57
47
63
7.0
24
16
8.2
30
20
9.9
36
24
11
41
28
13
46
31
14
50
35
15
55
38
12 14 17 19 22 25 27
3.2
2.0
0.8
Gro
un
d t
he
rmal
co
nd
uct
ivit
y (
W/m
/K)
4.0
2.8
1.2
2.4
0.4
1.6
3.6
0.50.4
2.4
Sand
(w
ater
-sat
urat
ed)
Cla
y/si
lt (d
ry)
Sand
(dr
y)
1.7
Cla
y/si
lt (w
ater
-sat
urat
ed)
Re
com
me
nd
ed
val
ue
s an
d r
an
ges
of
the
rmal
co
nd
uct
ivit
y
for
dif
fere
nt
rock
typ
es
(W/m
/K)
19
Issue 1.0 (02/09/2011)
Maximum power to be extracted per unit length of slinky ground heat exchanger trench (W/m) with 3000 FLEQ run hours
Conditions for use:Heat extraction only (inc. hot water)
3m minimum trench spacing (d ≥ 3m) Mean slinky depth between 0.8m and 1.2m
Table created assuming 32mm OD SDR 11 pipePipe length to trench length ratio, Rpt ≥ 4. For a 900mm slinky diameter this corresponds to a maximum 1250mm slinky pitch Table created assuming a relationship between the mean monthly temperature swing and annual mean ground temperature
Mean ground temperature (oC)6.0 7.0 8.0 9.0 10.0 11.0 12.0
NE
Sco
tland
NW
Sco
tland
E S
cotla
nd
Bor
ders
W S
cotla
nd
Nor
ther
n Ire
land
Nor
th-e
aste
rnN
orth
-wes
tern
Mid
land
sW
ales
E P
enni
nes
W P
enni
nes
Eas
t Ang
liaS
outh
-eas
tern
Sou
ther
n
Sev
ern
Valle
y
Sou
th-w
este
rn
Tham
es V
alle
y
Mean annual air temperature for UK regions (oC)
16
22
20
27
24
32
27
38
31
42
34
46
37
51
5.3
19
13
6.3
24
16
7.5
28
19
8.5
33
21
9.6
37
24
11
40
27
12
44
30
9.0 11 13 15 17 19 21
3.2
2.0
0.8
Gro
un
d t
he
rmal
co
nd
uct
ivit
y (
W/m
/K)
4.0
2.8
1.2
2.4
0.4
1.6
3.6
0.50.4
2.4
Sand
(w
ater
-sat
urat
ed)
Cla
y/si
lt (d
ry)
Sand
(dr
y)
1.7
Cla
y/si
lt (w
ater
-sat
urat
ed)
Re
com
me
nd
ed
val
ue
s an
d r
an
ges
of
the
rmal
co
nd
uct
ivit
y
for
dif
fere
nt
rock
typ
es
(W/m
/K)
20
Issue 1.0 (02/09/2011)
Maximum power to be extracted per unit length of slinky ground heat exchanger trench (W/m) with 3600 FLEQ run hours
Conditions for use:Heat extraction only (inc. hot water)
3m minimum trench spacing (d ≥ 3m)Mean slinky depth between 0.8m and 1.2m
Table created assuming 32mm OD SDR 11 pipePipe length to trench length ratio, Rpt ≥ 4. For a 900mm slinky diameter this corresponds to a maximum 1250mm slinky pitch Table created assuming a relationship between the mean monthly temperature swing and annual mean ground temperature
Mean ground temperature (oC)6.0 7.0 8.0 9.0 10.0 11.0 12.0
NE
Sco
tland
NW
Sco
tland
E S
cotla
nd
Bor
ders
W S
cotla
nd
Nor
ther
n Ire
land
Nor
th-e
aste
rnN
orth
-wes
tern
Mid
land
sW
ales
E P
enni
nes
W P
enni
nes
Eas
t Ang
liaS
outh
-eas
tern
Sou
ther
n
Sev
ern
Valle
y
Sou
th-w
este
rn
Tham
es V
alle
y
Mean annual air temperature for UK regions (oC)
14
18
17
23
20
27
22
32
25
35
28
39
31
43
4.3
16
10
5.0
20
13
6.0
24
15
6.8
27
17
7.7
30
20
8.7
33
22
9.3
37
24
7.2 8.6 10 12 14 16 17
3.2
2.0
0.8
Gro
un
d t
he
rmal
co
nd
uct
ivit
y (
W/m
/K)
4.0
2.8
1.2
2.4
0.4
1.6
3.6
0.50.4
2.4
Sand
(w
ater
-sat
urat
ed)
Cla
y/si
lt (d
ry)
Sand
(dr
y)
1.7
Cla
y/si
lt (w
ater
-sat
urat
ed)
Re
com
me
nd
ed
val
ue
s an
d r
an
ges
of
the
rmal
co
nd
uct
ivit
y
for
dif
fere
nt
rock
typ
es
(W/m
/K)
21
Issue 1.0 (02/09/2011)
Issue Number: Amendment Details: Date:
1.0 First issue 02/09/2011
4. AMENDMENTS ISSUED SINCE PUBLICATION
22