TABLE OF CONTENTS Although the selection of a cooling system for an industrial plant or process is usually straightforward, this is not always the case. Fairly extensive studies may be required before a final decision is made concerning the choice of a particular cooling system. These studies include:
process and operating requirements
existing and changing local cost structures
environmental concerns
aesthetic considerations
legal constraints
social factors
other considerations
For example, the relatively expensive GKN hybrid cooling tower shown in Figure 1.3.13 was constructed in an area where less costly alternatives would not have been tolerated by the public because of noise and unsightly cooling towers with visible plumes.
In contrast, the low-cost, wooden, natural-draft cooling tower shown in Figure 10.0.1 was erected at a power plant in the wooded area near Petrozavodsk, Russia. This cooling tower only uses spray nozzles to create a rain zone at its base. No fill or packing is employed. This reduces possible freezing problems during periods of extremely low ambient temperatures. Although the tower is not very sophisticated technically, it was probably the most appropriate choice for the particular plant during the planning stage.
Natural-draft wet-cooling towers are often found where relatively large amounts of heat must be rejected. Mechanical draft units are preferred in smaller installations. Mohiuddin and Kant present a simple but effective selection process, which can be followed to obtain an indication of the most appropriate system for a particular installation.
In many applications where the process...
