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Chillers and Their Pumps Chillers and Their Pumps 397
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Figure 148 Primary pump connections for primary-secondary pumping systems (From The Water Management Manual, SYSTECON, Inc, West Chester, Ohio, 1992, Figs 817 to 820)
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friction, expensive motorized valves are not needed to control the flow through the chillers The disadvantage to this pumping arrangement is that there is no standby pump If one chiller plus a different pump are put out of service, only one chiller would be available for operation This deficiency can be remedied by installing a standby pump, as shown in Fig 148b The standby pump can be connected to any chiller automatically or manually This is the most popular and economical method of providing standby pump capacity
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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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Chillers and Their Pumps 398 Pumps for Closed HVAC Cooling Systems
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Figure 148 (Continued)
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Some designers prefer to offer primary pump standby by installing the primary pumps in parallel, as described in Fig 148c This design is more expensive, since it requires three headers instead of two; it also requires a motorized valve on each chiller If the designer is not careful, enough friction will exist in the three headers to require installation of modulating control on the individual motorized valves
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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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Chillers and Their Pumps Chillers and Their Pumps 399
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There are few installations that justify this method of connecting primary pumps to chillers Another method of handling the primary pumping where there is a number of parallel chillers is to install variable-speed primary pumps, as shown in Fig 148d This installation with six chillers will be better served by installing three variable-speed primary pumps, each with 50 percent of the total capacity of all six chillers With this procedure, the primary pump s speed is controlled by differential pressure transmitters that maintain the desired constant differential pressure across the chiller evaporators The standby pumps are added and subtracted by the best efficiency or wire-to-water efficiency methods described in Chap 10 of this book The actual control selected will depend on the size of the primary pumps The flow through each evaporator is constant because the differential pressure transmitters maintain a constant pressure drop across them There are several significant advantages to variable-speed pumping in large, multiple-chiller installations First, the flow through each chiller evaporator is relatively constant, whether one or all of the chillers are in operation This is due to the precise control by the differential pressure transmitter and the digital pump speed control Second, since the pressure drop through the chiller loop piping is not included in the differential pressure set point, this loop can be reduced to a more economical size without affecting the flow through any of the chillers All the preceding diagrams show the primary pumps on the inlet side of the chiller On high-rise buildings where the static pressure is great, it may be advisable to install the primary pumps on the discharge of the chiller evaporator to help reduce the total pressure on the evaporators (see Fig 149a) High-rise buildings can create some special problems owing to the great amount of static head possible on equipment installed in these buildings This static head has been described in a pressure-gradient diagram (Fig 146b) for the building in Fig 149a For purposes of this example, this building has an overall height of 462 ft and a minimum of 10 psig (23 ft) at the top of the building for a total static head of 485 ft The diagram shown in Fig 149b provides the pressure gradients for both the maximum-flow and the zero-flow conditions The zero-flow diagram demonstrates that the casing pressure for the pumps and the design pressure of piping and valves at the bottom of the building must be based on the shutoff head of the secondary pump In this case, the shutoff head is 264 psig Locating chillers and pumps on top of a high-rise building will certainly reduce the pressure on the equipment, but the piping and coils at the bottom of the building will still be subjected to the high pressure shown in the pressure gradients of Fig 149b
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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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