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According to Air Moving and Conditioning Association (AMCA) Standard 210,1 A fan is a device for moving air which utilizes a powerdriven, rotating impeller The three fan types of primary interest in HVAC systems are centrifugal, axial, and propeller The fan motor may be directly connected to the impeller, directly connected through a gearbox, or indirectly connected by means of a belt-drive system
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521 Fan law equations
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The fan law equations are used to predict the performance of a fan at some other condition than that at which it is tested and rated The HVAC designer is particularly interested in the effects on horsepower, pressure, and volume consequent to varying the speed of the fan in a system
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Design Procedures: Part 3 96 Five
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The fan laws expressed in the following equations relate only to the effect of varying speed, assuming that fan size and air density remain constant CFM2 CFM1 RPM2 RPM1
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(51)
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RPM2 RPM1 RPM2 RPM1
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(53)
BHP2 where CFM SP TP BHP
BHP1
RPM2 RPM1
(54)
airflow rate, ft3 /min static pressure total pressure brake horsepower, bhp
Expressed in simple language, the fan laws say that when fan size and air density are unchanged, the air ow rate varies directly as the change in speed, the pressure developed by the fan varies as the square of the change in speed, and the power required to drive the fan varies as the cube of the change in speed The complete fan laws also include terms for changes in fan size and air density The laws are valid only when fans of different sizes (diameters) are geometrically similar CFM2 CFM1 TP2 TP1 SP2 SP1 BHP2 BHP1 where D RPM2 RPM1 VP2 VP1 RPM2 RPM1 D2 D1
(55) D2 D1 d2 d1
RPM2 RPM1
d2 d1
(56)
D2 D1
(57)
fan diameter and d
air density
For further variations, see ASHRAE Handbook, 2000 HVAC Systems and Equipment, Chap 18, Table 2, p 184
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Design Procedures: Part 3 Design Procedures: Part 3 97
Figure 51 Principle of operation of centrifugal fan
Centrifugal fans
A centrifugal fan creates pressure and air movement by a combination of centrifugal (radial) velocity and rotating (tangential) velocity As shown in Fig 51, these two effects combine to create a net velocity vector When the fan is enclosed in a scroll (housing) as shown in Fig 52, some of the velocity pressure is converted to static pressure The fan characteristics can be changed by changing the shape of the blade Typical shapes (Fig 53) are forward-curved, straight radial, backward-inclined (straight or curved), and airfoil
Figure 52 Cutaway view of centrifugal fan
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Design Procedures: Part 3 98 Five
Figure 53 Centrifugal fan blade types A Forward curved B Radial C Backwardinclined D Airfoil
The geometry of the fan wheel, inlet cone, and scroll also has an effect on fan performance and ef ciency Figure 54 shows a typical cross section for a backward-inclined (BI) or airfoil (AF) fan wheel For a given wheel or diameter, as the blade gets narrower and longer, higher pressures can be generated but ow rates are reduced The inlet cone is shown curved (bell-mouth) to minimize air turbulence Straight cones are also used, at the cost of some reduction in performance The clearance between the inlet cone and the wheel shroud must be minimized for ef ciency, because some air is bypassed through this opening The forward-curved (FC) wheel (Fig 55) usually has a short, wide blade and a at shroud The inlet cone is curved or tapered and is mounted to minimize the clearance between the inlet cone and shroud This type of fan handles large air volumes at low pressures The illustrations show single-width, single-inlet (SWSI) fans Doublewidth, double-inlet (DWDI) fans are also made
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