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1561 Variable primary (VP) and distributed pumping
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If the new chillers with computer control of their operation are available, the flow can be varied through the evaporators with variablespeed primary pumps The bypass is still supplied in the central energy plant to ensure that minimum flow is always available to the chillers With proper control, very little water flows in the bypass pipe under normal operation This provides the highest possible level of pumping energy conservation The minimum flow through the chiller evaporator should be specified in gallons per minute or minimum velocity in the tubes in feet per second by the chiller manufacturer As shown in Fig 813, only small circulators are needed in the chiller plant to ensure minimum flow in the chillers Under normal operation, no chilled water pumps run in the chiller plant
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1562 Water reset in distributed pumping
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On distributed pumping systems, where there is a need for reset of the water temperature over that supplied from the central energy plant, a bypass water control valve can be installed to change the building supply water temperature in accordance with some schedule such as load or outdoor temperature Water temperature reset is very simple with distributed pumping since the pressure in the return piping is greater than the pressure in the supply main The control valve for control of the building temperature is installed in the bypass as shown in Fig 1515 One positive fact about the location of this valve is that no pressure loss is added to the building pump head
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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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Chilled Water Distribution Systems Chilled Water Distribution Systems 433
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Building temperature 45 F
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1563 Use of distributed pumping
Distributed pumping has been used on both large and small installations It offers a great advantage on systems where there is a great difference in distribution friction between zones or buildings Typical of the large systems is the international airport shown in Fig 1516a; in this case, three secondary pumps with 1000-hp motors were eliminated by distributed pumping Building motors from 50 to 150 hp were installed in lieu of the secondary pumps A 26 percent reduction in installed pump motor horsepower was achieved by using distributed pumping Figure 1517 is the hydraulic gradient for secondary pumps, and it demonstrates the problem with them Too much pump head is applied at the beginning of the distribution system Air retainment and operating pressures would increase the overall maintenance of this water system Pressure-reducing valves or crossover bridges, with their energy waste, would be required on the buildings near the central plant to prevent overpressuring of the buildings Compare this to distributed pumping where there are no secondary pumps Figure 1518 demonstrates
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Chilled Water Distribution Systems
Figure 1516 Typical uses of distributed pumping (From Airport s Pumping System Horsepower Requirements Take a Nose Dive, 434
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
HPAC magazine, October 1993)
Chilled Water Distribution Systems Chilled Water Distribution Systems 435
Federal inspection service area and office building
System pressure, ft of water
Over pressure Concourse C Concourse A Concourse B
Building loss
Secondary pumps
Central plant pressure
Typical hydraulic gradient diagram for a conventional secondary pump loop (From Airport s Pumping System Horsepower Requirements Take a Nose Dive, HPAC magazine, October 1993)
Federal inspection service area and office building
System pressure, ft of water
Central plant pressure Distribution pumps
Typical hydraulic gradient diagram for distributed pumping at full load dotted lines represent pressure gradient after future concourse expansion
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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