Download Cooling Tower Fundamentals by John C. Hensley - Marley SPX Cooling Technologies, Inc. PDF

By John C. Hensley - Marley SPX Cooling Technologies, Inc.

A handbook to supply the fundamentals of cooling towers, from the employees of the Marley Cooling Tower corporation.

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001% attainable. (Sect. CASING A cooling tower casing acts to contain water within the tower, provide an air plenum for the fan, and transmit wind loads to the tower framework. It must have diaphragm strength, be watertight and corrosion resistant, and have fire retardant qualities. It must also resist weathering, and should present a pleasing appearance. Currently, wood or steel framed, field-erected towers are similarly cased with fire-retardant fiberreinforced polyester corrugated panels, overlapped and sealed to prevent leakage.

Fig. 49) The most-utilized louver materials are corrugated fire-retardant fiber reinforced polyester and treated Douglas Fir plywood on field-erected towers, galvanized steel on factory-assembled steel towers, and precast, prestressed concrete on concrete towers. The evolution of louver design began in the early era of splash type fill, more than a half century ago, at which time their primary function was to control the multitude of random water droplets produced by the splashing action. Because of the width and spacing necessary to accomplish this magnitude of water recovery, louvers became a highly visible, accented part of the cooling tower's appearance, as evidenced by Figure 49.

If required for appearance purposes, the casing can be extended to the height of the handrail. (Fig. LOUVERS Every well-designed crossflow tower is equipped with inlet louverts, whereas counterflow towers are only occasionally required to have louvers. Their purpose is to retain circulating water within the confines of the tower, as well as to equalize air flow into the fill. They must be capable of supporting snow and ice loads and, properly designed, will contribute to good operation in cold weather by retaining the increase in water flow adjacent to the air inlets that is so necessary for ice control.

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