Closed-Loop coolers recirculate coolant from a tank
mounted in the cooler, through a sealed coolant loop and
heat load (spindle) and back to the tank. The tank, pump,
and evaporator are all in the cooler.
Coolant is added to the tank through a filler/breather
port. The coolant level is always visible in the tank level
gauge. When the pump is energized, it draws coolant from
the tank and pumps it through the coolant loop.
The coolant absorbs heat from the heat load and then
dissipates it in the evaporator before returning to the tank.
The temperature controller senses the temperature of the
coolant leaving the tank and controls the refrigeration
effect in the evaporator to provide coolant at the desired
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Open-Loop coolers recirculate fluid from a remote tank,
through the cooler and back to the tank. The cooler works
to maintain a constant fluid temperature in the tank. The
pump and evaporator are in the cooler. The tank is
When the pump is energized it draws fluid from the
remote tank and pumps it through the evaporator in the
cooler and back to the tank. The temperature controller
senses the temperature of the fluid entering the cooler
and controls the refrigeration effect in the evaporator to
provide the desired fluid temperature in the tank. The
cooler should be installed as near as possible to the tank.
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In-Line coolers cool fluid that is passing through under
pressure. Only the evaporator is in the cooler. Both the
pump and tank are remote.
These coolers are often used in applications where
it is advantageous to have the pump mounted on or
near the tank to recirculate fluid through the cooler and
back to the tank. This type of installation is necessary
when the cooler is installed too far above or away from
the tank to allow for the use of an Open-Loop cooler.
The temperature controller senses the temperature of
the fluid entering the cooler and cycles the refrigeration
effect to maintain the desired fluid temperature in
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Drop-In coolers are designed to be mounted on top of a
tank to cool the fluid that is passing through it. The stainless
steel immersion coil type evaporator is submerged
into the fluid in the tank. A small agitation pump continuously
moves the fluid around the evaporator coils ensuring
proper heat transfer. The temperature controller senses
the fluid temperature and controls the refrigeration
effect to maintain the fluid in the tank at the desired temperature.
Drop-In coolers save floor space and are ideal for
installation on tanks where the coolant is too dirty to
pump through a heat exchanger. The cooler can readily
be lifted out for tank cleaning or inspection.
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Turmoil, Inc • 735 West Swanzey Rd. • P.O. Box 583 • West Swanzey, NH 03469 USA
Call: 603-352-0053 • Fax: 603-352-5424