Tranquility
®
Fluid Cooler – 60 Hz
R e v. : F e b r u a r y 2 2 , 2 0 2 2
G e o t h e r m a l H e a t i n g a n d Co o l i n g
8
Unit Application and Fluid Connections
System Application and Configuration:
There are several different applications where a fluid
cooler can be utilized when combined with a water-
source or geothermal system. Two applications with
their configurations are detailed below:
Stand-Alone
In a stand-alone application the fluid cooler is the
only device utilized to reject or extract heat from the
ambient air to a circulating fluid loop. Within this
application there are two sub-applications. The first
would be for an installation that doesn’t want to have
a refrigerant containing compressor section placed
outdoors. The fluid cooler would be placed outdoors
on a permanent installation pad much like a traditional
air-source compressor section. The second is for a
non-scheduled change-out where an owner wants to
have a geothermal heat pump installed but there is a
lead time for the geothermal loop to be installed. A fluid
cooler would be temporarily installed with the new heat
pump so the owners can have space conditioning while
waiting for the loop installation to be completed. The
fluid cooler would then be removed upon installation of
the loop.
The TFC system has two different fluid circulation
options for these applications. The first option has an
internal flow switch inside the unit to validate flow in
the system. The water source heat pump will contain
a pump to circulate fluid throughout the system
when a call is given from an indoor thermostat. The
second option provides an internal pump in the TFC
in installations where the water source heat pump
does not have a circulator. As water circulates in both
options, the fluid cooler recognizes flow and runs
the fan at the appropriate speeds. This requires a
performance match from the fluid cooler with the water
source heat pump.
An example of this fluid circuit installation can be seen
in Figure 1.
Figure 1: Stand Alone Circuit Schematic
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Hybrid
In a hybrid application the fluid cooler is utilized as a
supplementary device with a geothermal well field
to extract heat in a circulating fluid loop. The hybrid
system can allow for a reduction in total loop length
to balance out the loads in a system over an annual
basis. The geothermal loop acts as a “thermal battery”
that can be recharged by the fluid cooler. The most
common use for a hybrid system is in buildings which
reject more heat to the ground annually. In this system,
the geothermal loop will slowly warm up the far field
ground temperature creating a “hot loop” condition. A
fluid cooler allows for this excess heat to be rejected
during favorable conditions which typically occur during
the fall, spring and winter as the ambient temperatures
will be less than the ground temperature.
