User manual
18
Wintertime Operation
The Marley film-fill system used in the MH Fluid Cooler has air entrance louvers
that are molded as an integral part of the fill. This feature makes these fluid
coolers very forgiving of cold weather operation, even at the low temperature
and reduced load conditions encountered in low temperature applications.
Nevertheless, during operation in subfreezing weather the opportunity exists
for ice to form in the colder regions of the fluid cooler.
Slushy, transitory ice forms routinely in the colder regions of the fill
of low temperature towers, and is visible through the tower louvers.
Such ice normally has no adverse effect on fluid cooler operation,
butitsappearanceshouldbeasignaltotheoperatortoundertake
ice control procedures.
It is the operator's responsibility to prevent the formation of destruc-
tive(hard)iceontheuidcoolerll.Certainguidelinesshouldbe
followed:
1. Do not allow the fluid cooler's leaving process fluid temperature to drop
below 45°F. If such low temperature operation is necessary or beneficial
to your process, establish the minimum allowable level as follows:
During the coldest days of the first winter of operation, observe whether
any ice is forming on the louver face, particularly near the bottom part of
the louver face. If hard ice is present on the louvers, you must increase
the allowable cold water temperature.
If the minimum allowable cold process fluid temperature is es-
tablished at or near minimum heat load, it should be safe for all
operating conditions.
Having established the minimum allowable cold water temperature, maintain-
ing that temperature can be accomplished by fan manipulation, as outlined in
Item 4 under Fluid Cooler Operation.
2. As cold air enters the louvers, it causes the water flowing over the fill to
be drawn inward toward the center of the tower. Thus, under fan opera-
tion, the louvers and lower periphery of the tower structure remain partly
dry, seeing only random splashing from within the tower—plus normal
Operation
Caution
Note