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Basics of Pump Design
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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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Basics of Pump Design 106 HVAC Pumps and Their Performance
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pumps, a random selection of a pump should be made, and it should be dissembled for full inspection of the impeller and interior finish of the volute 413 Bibliography
Pump Handbook, McGraw-Hill, New York, 1996 Centrifugal Pump Standards, Hydraulics Institute, Parsippany, NJ, 1996
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Source: HVAC Pump Handbook
Physical Description of HVAC Pumps
51 Introduction A number of different types of centrifugal pumps are used to handle all the various pump applications in the HVAC industry HVAC pumps can vary from small in-line circulators with a capacity of 20 gal/min at 10 ft of head and fractional horsepower motors to large cooling tower pumps with capacities of 50,000 gal/min at 100 ft of head and equipped with 1500-hp motors These pumps can be constant speed or variable speed This chapter provides a physical description of the various pumps that are popular with HVAC designers for chilled, hot, and condenser water service 52 Physical Description of HVAC Pumps Centrifugal pumps account for most of the pump applications in the HVAC industry Some positive-displacement pumps are found on HVAC systems, but they are used for specific applications with small capacities, not for distributing water in hot, chilled, and condenser water or cooling tower applications A specific duty for positivedisplacement pumps in the HVAC field is the metering of chemicals into water systems Table 51 provides a chart that describes the various types of centrifugal pumps found on HVAC systems There is not universal agreement on some of the generic names applied to these pumps For example, the double-suction pumps listed are often called horizontal split case pumps The words diffuser, axial flow, and turbine are used interchangeably for one class of centrifugal pumps; axial flow appears to
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Physical Description of HVAC Pumps 108 HVAC Pumps and Their Performance
TABLE 51
Classification of HVAC Pumps
be the least confusing and will be the name used herein Hopefully, this chart will prove to be a guide for the designer to the most popular types of pumps used on these water systems
53 Two Basic Types of Centrifugal Pumps As demonstrated in Chap 4, there are two principal types of centrifugal pumps for HVAC water systems; these are volute and axial-flow pumps The volute pump is offered in many configurations and handles much of the pump duty on HVAC systems Although not as popular as the volute pump, the axial-flow pump handles some very important services The words axial flow best
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Physical Description of HVAC Pumps Physical Description of HVAC Pumps 109
describe these pumps, because water is diffused around the entire periphery of the impeller and flows axially through the pump There is no volute to collect the water from the impeller Instead, the impeller is housed in a bowl assembly that has a suction connection and a discharge section Water enters the pump bowl and passes through the impeller and the bowl vanes to the discharge connection With this arrangement, it is very easy to make up these pumps in what is called stages A two-stage pump merely indicates that two bowls and impellers are installed in series together, as shown in Fig 42d How pumps operate in series or parallel is described in detail in Chap 6
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