CTI TP06-19 : 2006

For many years PVC film fills have been the most popular choice of heat transfer media for use in cooling towers. Throughout this history, design features of these fills have continued to evolve from the first cross corrugated products through vertically fluted fills to today's popular combination designs. Some of these features are not obvious to the casual observer and if not chosen correctly can adversely affect tower performance, product cost, lifespan, or ease of installation. This paper traces the history of these fill designs while providing guidelines as to the proper fill selection.