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Bosch Geothermal Heat Pumps
Bosch Thermotechnology Corp.
Data subject to change
Applications Manual
Fluid Volume (gal [L] / 100' Pipe)
Pipe
Size
Volume (gal) [L]
Copper
1"
4.1 [15.5]
1.25"
6.4 [24.2]
2.5"
9.2 [34.8]
Rubber Hose
1"
3.9 [14.8]
Polyethylene
¾" IPS SDR11
2.8 [10.6]
1" IPS SDR11
4.5 [17.0]
1.25" IPS SDR11
8.0 [30.3]
1.5" IPS SDR11
10.9 [41.3]
2" IPS SDR11
18.0 [68.1]
1.25" IPS SCH40
8.3 [31.4]
1.5" IPS SCH40
10.9 [41.3]
2" IPS SCH40
17.0 [64.4]
Unit Heat Exhanger
Typical
1.0 [3.8]
Flush Cart Tank
10" Dia x 3ft
[254mm x 0.9m]
10 [37.9]
Tab. 29
9.9 Closed-Loop Con guration
An installer must use good judgment and knowledge when
determining the type of ground heat exchanger to install.
Some of the factors that must be considered include the
yard or lot size and the probable cost of excavation. For
example, a one inch horizontal pipe ground heat exchanger
will require signi cantly more trench than a six inch
horizontal pipe ground heat exchanger. Labor is also an
important consideration for the ground heat exchanger.
Additionally, it could be necessary to utilize the larger
diameter pipe ground heat exchanger simply due to limited
ground space for installation.
Most installers will develop ongoing knowledge of different
ground heat exchanger options and the most cost effective
design for various situations. This understanding over
time will allow the most effective application for later
installations.
For most horizontal ground heat exchangers, the depth
of the piping is typically around 5 to 6 feet below the
surface. This is often due to trench safety concerns and
the volume of earth (soil) that must be moved. For most
vertical ground heat exchangers, parallel-series ground
heat exchanger designs prove more economical due to
increasing drilling costs. This design incorporates a piping
arrangement where a circuit will travel down and then up
through two or more consecutive boreholes (series) to
provide the required total length for the application.
Soil moisture content and different soil types can have an
impact on the earth ground heat exchanger design as well.
Damp or saturated soil types will typically require shorter
ground heat exchangers that those used for dry soil or
sand.
Ground heat exchanger design is often a compromise
between pressure drop and turbulent ow in the ground
heat exchanger pipe when considering effective heat
transfer. To achieve an effective and acceptable Reynold’s
Number the following recommendations should be
followed during the design phase:
f
3 gallons per minute (GPM) per ton of cooling capacity
should be maintained for smaller systems
f
For larger systems, slightly less GPM is acceptable
(2.5 - 2.7 GPM per ton of cooling capacity)
f
It is difficult to select pumps to attain exactly 3 GPM
per ton of cooling in most cases and is typically not
cost effective
f
One circuit per nominal ton of cooling capacity
(adjustable to two circuits per ton if necessary)
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