|
The table directly below indicates
the increase in heat transfer rate for a vertical heat
exchanger when the GeoClip™ is used.
|
Increase in heat transfer
rate of borehole using the GeoClip™
|
|
¾”
U-bend
|
1”
U-bend
|
|
4.5” Bore
|
5” Bore
|
6” Bore
|
4.5” Bore
|
5” Bore
|
6” Bore
|
|
74.45%
|
78.65%
|
86.15%
|
65.82%
|
69.81%
|
76.94%
|
The table below shows the thermal
conductivity of bentonite grout and thermally enhanced
bentonite grouts which have silica sand added to them.
Under the GeoClip™ section an equivalent thermal
conductivity is given for each grout mixture, u-bend
pipe size and bore diameter using the GeoClip™.
|
Grout material
|
Equivalent
borehole conductivity using the GeoClip™
|
|
Bentonite
- lbs.
|
Silica
sand - lbs.
|
T.C. grout - Btu/hr.
ft °F
|
¾” U-bend |
1” U-bend |
|
4.5” Bore
Btu/hr. ft °F
|
5” Bore
Btu/hr ft °F |
6” Bore
Btu/hr ft °F
|
4.5” Bore Btu/hr ft °F
|
5” Bore
Btu/hr ft °F
|
6” Bore Btu/hr ft °F
|
|
50
|
0
|
0.45
|
0.79
|
0.80
|
0.84
|
0.75
|
0.76
|
0.80
|
|
50
|
50
|
0.57
|
0.99
|
1.02
|
1.06
|
0.95
|
0.97
|
1.01
|
|
50
|
100
|
0.69
|
1.20
|
1.23
|
1.28
|
1.14
|
1.17
|
1.22
|
|
50
|
150
|
0.80
|
1.40
|
1.43
|
1.49
|
1.33
|
1.36
|
1.42
|
|
50
|
200
|
0.91
|
1.59
|
1.63
|
1.69
|
1.51
|
1.55
|
1.61
|
|
