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Heat Exchanger Engineering Techniques

Michael J. Nee
Michael J. Nee
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ASME Press
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Fans or blowers are usually necessary for air coolers to perform. Their selection has a pronounced effect in deciding which air cooler to install. Some variables that might influence selection include:

Fan coverage and bundle geometry

Fan tip speed and noise

Whether to use fan(s) or blower(s)

Fan or blower starvation


Air velocity limit

Geometry of transition pieces connecting blower and coil or coil and duct

Effect of fan size on shipping width

Meeting cfm and static pressure requirements

In addition, the engineer should consider several question before finalizing a selection if trouble jobs are to be avoided: Should the fan blades be fixed or autovariable? Should the fan motor be single-speed or two-speed? Will the motor be overloaded during low-temperature operation? How many fans should be used? Should the design be forced-draft or induced-draft? And is recirculation needed (to prevent freezing or channeling)?

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