Fan Ring and Plenum Chambers

Fan Ring and Plenum Chambers The air must be distributed from the circular fan to the rec tangular face of the tube bundle. The air velocity at the fan is between 3.8 and 10.2 m/s (750 and 2000 ft/in). The plenum-chamber depth (from fan to tube bundle) is dependent upon the fan dispersion angle (Fig. 11-46), which should have a maximum value of 45°. 

A typical air-cooled condenser has a bank of finned tubes, a steel supporting structure with plenum chambers and fan rings, axial-flow fans, drive assemblies (usually electric motors with cog or V-belt drive), and miscellaneous accessories, such as vibration switches, fan guards, fencing, hail screens, and louvers. Figure 13-7 shows a typical air cooler. These components may be arranged in any of several ways to best suit a particular application and equipment layout. 

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