Projects
maximum operating speed, which reduced the maximum
noise levels in consideration to nearby residents,”
he explains.
SAVING WATER AND ELECTRICITY
What makes the system special/unique is the ability to
maintain the temperature efficiency of a fully evaporative
cooling tower at a fraction of the water consumption, it
saves water and power. “Due to the extreme efficiency and
significant surface area of the adiabatic unit, it also allows
the possibility of free cooling at low ambient temperatures,
once the system allows for it. During winter the chiller can
be bypassed completely which will save significantly on
overall power,” adds Glenn.
Other sustainable aspects of the unit include:
• IE4 EC fans which modulate speed according to a
targeted outlet temperature of 28⁰C,
• The units were selected for a very low coil pressure drop,
which allows lower pump operating energy,
• Based on simulated building load, the calculated water
saving is approximately 99%,
• Based on simulated building load, the calculated energy
saving is approximately 32%.
www.hvacronline.co.za
PLUGGING IT IN
According to Glenn, the client is very happy. “Even during
peak summer conditions, the units rarely need to initiate the
precooling pads. There is a cooling system suited to each
application, and the site requirements need to be considered
before a selection is to be made, it is still possible that in some
RACA Journal I February 2020
The client sought
to replace the old
cooling towers
but retain the
performance
thereof.
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