1 0 6 |
Bosch Geothermal Heat Pumps
Bosch Thermotechnology Corp.
Data subject to change
Applications Manual
17 Bosch Geothermal Heat Pump
System Options
17.1 Bosch Cupronickel Coaxial Heat
Exchanger
Cupronickel heat exchangers (Fig. 124) are recommended
for open loop applications due to the increased resistance
to build-up and corrosion, along with reduced wear caused
by acid cleaning. Corrosion can often occur due to the
water containing a higher level of chemicals.
Fig. 124
Cupronickel refrigerant-to-water heat exchangers have a
cupronickel inner water tube and a steel refrigerant outer
tube design (Fig. 125), rated typically to withstand 600
PSIG working refrigerant pressure and 450 PSIG working
water pressure. All water lines are typically copper.
Fig. 125
The coaxial heat exchanger’s convoluted tube has
increased heat transfer surface area per unit length. This
allows full ow of both water and refrigerant around its
entire periphery for improved performance. Thermal
performance is enhanced by the convolutions to both
the water and refrigerant ows. All cupronickel coils are
insulated (Fig. 126).
Fig. 126
17.2 Bosch Heat Recovery Package (HRP)
The Bosch Heat Recovery Package (HRP) is a factory-
mounted option (Fig. 127). It consists of a forced pumped
unit that employs a circulating pump to move water
through a double wall/vented heat exchanger and returns
the heated water to a water tank. Typically, these devices
are referred to as “desuperheaters”, and can provide
considerable operating cost savings by utilizing excess
heat energy from the Bosch geothermal heat pump to
help satisfy domestic hot water needs. The double wall/
vented heat exchanger factory-mounted within the Bosch
geothermal heat pump eliminates the need to tie into the
Bosch geothermal heat pump refrigerant circuit.
Fig. 127 Typical heat recovery package installation
