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ABS-PRC001-EN38
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Connections
Cooling
Water Piping
Figure JC-5. Cooling-water piping with cooling tower
Figure JC-6. Cooling-water piping, three-way mixing valve
Cooling Water Piping
The cooling water piping design for the
Horizon series of absorption chillers
differs from conventional reciprocating
or centrifugal systems, in that cooling
water passes through the absorber
section of the machine prior to entering
the condenser.
The Horizon Single Stage absorption
chiller is designed to start and operate
with cooling-water temperatures as low
as 55°F [12.8°C]. In typical applications,
the machine is selected on the basis of
the cooling-water temperature that will
be available at full-load and at the design
outside conditions. In air conditioning
applications utilizing a cooling tower, this
is usually 85°F [29.4°C].
With a cooling tower sized at design
conditions, the temperature of the
cooling-water supply to the unit will
decrease with any decrease in cooling
load or outside wet-bulb temperature.
The lower cooling-water temperature
would normally tend to increase the
capacity potential of the unit. In the
Trane design, the UCP2 adaptive
controls will limit the energy input of the
machine based on the entering cooling
water temperature, thereby preventing
overfiring of the machine.
In typical air-conditioning applications,
precise cooling-water temperature
control is not required. In process
applications, however, where extremely
close control of leaving chilled-water is
required, it is recommended that a tower
valve be used to maintain cooling-water
temperature at a specified temperature.
Constant cooling-water temperature
allows the unit control valve to more
precisely control leaving chilled-water
temperature. Also, in applications where
well water or other cooling water will be
available at a temperature below 65°F
[18.3°C], a control valve is recommended
to maintain the temperature at 65°F
[18.3°C] or above. Changes in condenser
water temperature should not exceed
1°F per minute in the range of 75°F to
95°F [23.9 to 35°C].
Figure JC-5 illustrates a typical air-
conditioning installation without a
cooling-tower control valve. Figure JC-6
illustrates typical cooling-water piping in
applications where a three-way valve
may be required. Figure JC-7 illustrates
typical cooling-water piping utilizing well
or river water.