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9 8 | Bosch Geothermal Heat Pumps
16 Bosch Geothermal Water-to-
Water Heat Pump Applications
Bosch water-to-water geothermal heat pump systems (Fig.
116) offer the customer complete exibility over any other
type of geothermal heat pump system since they can be
applied for space heating, space cooling, water heating,
oor warming, snow melting, and many other types of
applications that utilize either hot or chilled water.
All Bosch water-to-water geothermal heat pumps are
actually modular reverse cycle two stage chillers and low
temperature boilers, providing the best combination of
performance and ef ciency available today. Safety devices
are built into each unit to provide the maximum system
protection possible when the unit is properly installed
and maintained. All Bosch water-to-water geothermal heat
pumps are Underwriters Laboratories (UL) and (cUL)
listed for safety, and designed to operate with entering
source liquid temperature between 25°F and 110°F.
Bosch water-to-water geothermal heat pumps can be used
with most geothermal sources (open and closed systems).
They require much less energy relative to typical forced
air systems as the need for ducting is eliminated. They
can be used for hydronic-based zoning, in combination
with thermal storage and off peak electrical rates, as
well as with solar thermal input, or in combination with
solar photovoltaic systems to produce "net zero" houses.
Additionally, they can be dedicated for domestic water
heating or serve as ancillary domestic water heating.
Bosch water-to-water geothermal heat pumps can be used
for producing "process water" in industrial applications,
controlled as a staged system to better match loads
(multiple units), stacked to save space (multiple units),
and used for loads such as pool heating, spa or hot tub
heating.
For optimal cooling and dehumidi cation, Bosch
recommends a separate Bosch water-to-air geothermal
heat pump for cooling. Controls are much simpler when
a Bosch water-to-water geothermal heat pump is used
for space heating and/or domestic water heating, and
a Bosch water-to-air geothermal heat pump is used for
cooling. Since the Bosch water-to-water geothermal heat
pump and the Bosch water-to-air geothermal heat pump
can share one ground loop, the installation cost of using
a Bosch water-to-air geothermal heat pump for cooling is
the incremental cost of the unit. Generally, no additional
ground loop is required (in colder climates), and the cost
of the Bosch water-to-air geothermal heat pump is usually
less than the cost of chilled water/fan coil units, especially
if the cost of additional piping, valving, controls and labor
is considered. The advantages of Bosch geothermal heat
pumps for cooling (no outdoor unit, no refrigerant line
sets, longevity, etc.) should be considered when cooling is
necessary.
Data subject to change
Fig. 116 Water-to-water heat pump
16.1 Bosch Geothermal Water-to-Water Heat
Pump Components
The Bosch water-to-water geothermal heat pump is
equipped with exceptional components (Fig. 117). One
of the most advanced components is the Copeland
"UltaTech" two-stage compressor. The performance of
regular scroll compressors is taken to the next level with
these two-stage units. A simple solenoid valve bypasses
refrigerant providing two stages of operation. This feature
translates into the most ef cient unit performance on
the market today, ensuring peak performance and energy
savings under widely differing operating conditions. And,
the unit comes ready for geothermal applications.
refrigerant/water heat exchanger
(condenser in heating mode)
(evaporator in cooling mode)
compressor
cooling "source"
water
(heating mode)
Fig. 117 Water-to-water heat pump internal diagram
Applications Manual
warm "sink" water
(heating mode)
thermal expansion valve
refrigerant/water heat exchanger
(evaporator in heating mode)
(condenser in cooling mode)
Bosch Thermotechnology Corp.
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