javascript code 39 barcode generator Design Procedures: Part 3 102 Five in Software

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Design Procedures: Part 3 102 Five
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Figure 59 Recommended performance of a typical centrifugal fan (Reprinted from AMCA Publication 201-90, Fans and Systems, with written peermission from Air Movement and Control Association, International, Inc)
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horsepower selection, and a different size fan will be needed If the problem is discovered after installation, it could be very costly to x The most common design and installation errors relate to fan inlet and outlet conditions The ideal in both cases is a gradual transition with no turns close to the fan Turning vanes must be provided in inlet duct elbows An inlet condition that creates a swirling motion in the direction of rotation will reduce the pressure-volume curve by an amount depending on the intensity of the vortex; this is the principle used by inlet vane dampers A condition that causes a swirl opposite to the direction of rotation will cause a substantial increase in horsepower Installation in an intake plenum (as in most packaged HVAC systems) or discharging directly into a plenum (as in most multizone and dual-duct systems) will affect fan performance adversely The performance curves indicate fan classes Classes I, II, III, and IV relate to structural considerations required to accommodate higher speeds and pressures These include stronger frames and wheels and larger shafts and bearings The fact that a fan has a class rating means that it can be operated at any or all possible points within that class However, if a selection approaches the upper pressure limit of a class, it would be prudent to specify a fan design in the next higher class
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Design Procedures: Part 3 Design Procedures: Part 3 103
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Figure 510 De cient duct system performance, system effects ignored (Reprinted from
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AMCA Publication 201-90, Fans and Systems with written permission from Air Movement and Control Association, International, Inc)
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525 Inlet vane dampers for fan volume control
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A common method of fan volume control employs the inlet vane damper This consists of a ring of pie-shaped elements which open and close in parallel Control may be manual or automatic When properly installed to provide an inlet swirl in the direction of fan rotation, the damper alters the fan performance curve as shown in Fig 511 The fan horsepower is also reduced, although not as much as would be predicted by the fan laws, because the damper increases the system pressure loss Use of discharge dampers is not recommended for volume control, only for fan isolation A variation of the inlet vane damper concept is a cone at the fan inlet which can be moved in or out, thereby varying the size of the fan inlet
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526 Mechanical and structural considerations
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The mounting and driving mechanism for the fan wheel entails many mechanical and structural considerations The bearings which support
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Design Procedures: Part 3 104 Five
Figure 511 Typical normalized pressure-volume curve-inlet vane control for a centrif-
ugal fan (Reprinted from AMCA Publication 201-90, Fans and Systems with written permission from Air Movement and Control Association, International, Inc)
the shaft come in many kinds, depending on the speed of rotation, weight of the fan wheel, belt tension, power transmitted, and whether the fan wheel is overhung (Fig 512) or supported between bearings (Fig 513) Sometimes three bearings are used; then alignment must be precise Bearing supports must be strong enough to support the bearings without exing The drive shaft must be strong, true, and rigid enough to support the fan wheel between the bearings and to transmit the required power without undue exing over a speci ed rotational speed All rotating shafts have a critical speed at which excessive vibration, noise, and possible failure will occur Many shafts have two or more critical speeds Sometimes the lower critical speed is less than the normal speed range of the fan This is satisfactory when the fan is accelerated quickly through the critical speed It will not be satisfactory if the fan is to be used in a speed-controlled VAV application
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