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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2006 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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HVAC Pump Performance 168 HVAC Pumps and Their Performance
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67 Pump Noise Pump noise in HVAC water systems is objectionable since it can travel through the piping to other areas of the building outside the equipment rooms Also, the noise may indicate trouble in the pump or its motor with the possibility of expensive maintenance Further, a noisy pump often indicates inefficient pump operation An interesting article appeared in the September 2004 issue of HPAC Engineering Magazine on how low-frequency noise impairs learning There is absolutely no reason to allow noisy pump operation; noise in pumps comes from improper installation, selection, or faulty operation Pump noise is much more prevalent in constant-speed pumps than in variable-speed pumps Pump noise originates from outside of or inside the pump
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671 Noise outside the pump
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The outside noises stem from the motor or misalignment of the pump and motor Motor noise comes basically from speed Most HVAC pump motors operate quietly at either 1200 or 1800 rev/min synchronous speeds At these speeds there should not be any objectionable noise Often, there are opportunities to achieve higher pump efficiencies by operating the pumps at 3600 rev/min synchronous on high-head, variable-speed applications Care should be taken, in this case, to ensure that objectionable noise will not travel outside the equipment room when the pump must operate near its design condition The other major outside sources of noise are caused by misalignment of the pump and motor or distortion of the pump by the connected piping These are easily corrected by realignment of the pump and its motor and checking the piping to ensure that it is supported properly Standard procedures for pump alignment are available from pump manufacturers and the Hydraulic Institute Misalignment may also be caused by a poor pump foundation or the pump base itself See Chap 25 for the proper installation of HVAC pumps Most of the pump companies and the Hydraulic Institute have very good instructions and diagrams for proper design of pump foundations Pump bases vary; some have more than adequate strength to maintain pump and motor alignment while others may be questionable The design of pump bases should be scrutinized carefully to ensure adequate construction Dowling of pump bases is not required in most HVAC installations other than large cooling tower pumps and some large chilled water pumps Likewise, vibration and temperature detectors are seldom required on HVAC pumps and motors
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2006 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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HVAC Pump Performance HVAC Pump Performance 169
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Much of the objectionable noise coming from a pump installation originates within the pump itself There are two basic causes for internal pump noise, namely, improper selection or operation Both of these are caused by operating the pump far from the best efficiency curve for a pump The following description of noise sources will describe how noise is generated within the pump Internal pump noise comes from: (1) mechanical losses; (2) hydraulic loss caused by the water flowing through the impeller and casing, and (3) circulation loss caused by water flowing past the tongue or cut water of the pump Figure 64 describes these losses Obviously, noise is a form of energy, so a noisy pump is usually an inefficient pump The noise in a pump is at it lowest when the pump is operated at the flow at the best efficiency point (BEP), Fig 618 This figure is typical of volute pumps and does not represent any particular pump Also, there are three procedures needed to avoid noise in an HVAC pump installation: (1) Ensure quality in the construction of the pump and its installation (2) select the pump at a point within the allowable operating point (AOP) specified by the manufacturer, and
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