continuously routes water returning from the process
through heat exchangers. Exhaust fans at the top of the
central cooler ensure a steady stream of incoming cool air
and outgoing heated air. The heat exchangers and exhaust
fans together are all that’s needed to cool process water.
• Adiabatic cooling – As mentioned before, this function only
activates in hot weather as needed to meet cooling needs.
• Increased adiabatic cooling – A patent-pending “adiabatic
booster system” enables the unit to deliver even lower
process cooling water temperatures in the hottest climates, still without the use of central chiller.
• “Free cooling” – The system automatically shuts down any
chillers and lets the central cooler provide all the cool
process water needed via ambient air flow.
Additional energy savings come from variable speed fans
that reduce fan energy use by as much as 25% compared to
typical on/off fans, as well as high-efficiency pumps that can
also reduce energy consumption.
Taken together, these capabilities mean that a closed-loop
adiabatic process cooling system can reduce energy consumption for process cooling by as much as 50% compared
to a conventional cooling tower/central chiller system.
Central coolers equipped with available fan exhaust dif-
THE TIME IS RIGHT FOR NEW COOLING METHODS
fusers also keep hot discharge air from being drawn into the
adiabatic chamber at the bottom of the unit – while allowing
it to consume significantly less energy compared to models
without the diffusers.
Facing increasing competitive pressures, pharmaceutical
processors with cleanrooms continue to upgrade their processing technologies for greater precision. Any one of these
other improvements can be a good opportunity to reevaluate the process cooling system, as well.
One of the best reasons to do so is to reduce energy use
in the cleanroom. Although energy efficiency hasn’t been
a primary target for improvement in cleanrooms, it’s an increasingly important factor due to rising energy costs.
As you can see here, a closed-loop adiabatic process cooling system represents a significant opportunity for energy
efficiency improvements. The efficiency extends to other resources as well – in particular, water savings. The closed-loop
system uses up to 98% less water than an evaporative, open-loop cooling tower system. The closed loop also saves on the
related maintenance and chemical treatment costs. ■
ABOUT THE AUTHOR
Al Fosco is the Global Marketing Manager for Frigel North
America. He has a Masters degree in Heat Transfer and Fluid
Mechanics Engineering from the University of Illinois.
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