SPX Cooling Technologies Marley Sigma Wood CoolingTower 1200 - Manual (Page 4)

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/ Construction and Components /
Fill/Louvers/Drift Eliminators
Marley high-performance film fill is the heart of every
Sigma tower. A repeating chevron pattern provides the
wetted surface and air turbulence necessary for proper heat
transfer, while minimizing resistance to airflow so you’ll save
on fan power. Molded protrusions on each fill sheet assure
uniform spacing.
Fill sheets include both louvers and drift eliminators.
The louvers in this patented arrangement keep water on the
fill sheets and in your tower, and also assure proper heat
transfer throughout wide variations in airflow. Users find this
fill operates ice-free even in extremely cold weather.
Fill sheets are vacuum formed 15 mil (.015") thick
polyvinyl-chloride (PVC) capable of service at hot water
temperatures up to 125°F. Stainless steel structural tubes
resting in stainless steel hangers support the fill, and PVC
tubes control alignment. Series 1000 fill includes two
stainless supports, and Series 1200 fill uses four stainless
supports. This system also holds the bottom of the fill sheets
above the cold water basin floor to simplify basin cleaning.
Integral drift eliminators prevent the costly nuisance of
drift spotting on objects in the sur round ing environment.
Their unique shape induces the air flow through three distinct
direction changes as illustrated above. The final turn directs
air toward the fan to save you fan horsepower. Moisture
carried in the air stream can’t make these abrupt turns, so
drift is 0.010% or less of the circulating water flow rate.