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Chilled Water Distribution Systems Chilled Water Distribution Systems 421
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Secondary pumping systems with booster
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pressure in the core area Only the far building is shown for the core area for clarity As shown, the booster pumping procedure reduces the maximum discharge pressure from 277 to 212 ft This also reduces the total energy consumption of the system and cuts the first cost required for high-pressure control valves and accessories The booster pumping systems must be designed to operate in conjunction with the secondary pumps in the central plant If the secondary pumps are constant-speed pumps, it may be necessary to equip the booster systems with bypasses and building control valves (Fig 156c) The bypass around the booster pumps enables the building to be served by the central plant secondary pumps under light loads when the secondary pumps may produce adequate head to serve the building This results in added pumping efficiency, since the booster pumps can be shut down during this period The building control valve is necessary if the central plant secondary pumps can overpressure the building This valve is controlled by the same remote differential pressure transmitter that controls the speed of the booster pumps when they are in operation If the secondary pumps are variable-speed pumps, they are controlled by differential pressure transmitters located remotely at key
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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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points in the central zone (Fig 156a) The bypasses and control valves required with constant-speed secondary pumps are not required on most installations where all the distribution pumps are variable-speed pumps Typical of this is the hospital installation shown in Fig 157, where the secondary pumps in the central energy plant transfer the water to the hospital
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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 423
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Figure 157 Distributed pumping in a large hospital
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
Chilled Water Distribution Systems 424 Pumps for Closed HVAC Cooling Systems
Figure 157b describes the series pumping for this installation An age-old rule of not running pumps in series on HVAC systems appears to be violated here If these secondary pumps were constantspeed pumps, there would be pump operating problems Since all the secondary and booster pumps are variable-speed pumps with each pumping system being controlled by its own differential pressure transmitters and digital controllers, there have been no operating problems over a number of years of service Figure 158 describes the installation of two variable-speed pumps in series Each of the pumps has its speed controlled by a differential pressure transmitter Pump No 2, in this figure, has a bypass check valve to allow flow around the pump when it is stopped The ability to operate both systems by pump No 1 on reduced loads is an important energy-saving feature If pump No 1 can provide adequate flow and head for both chilled water systems, the losses in one pump and its pipe fittings are eliminated This is a simple control feature; if pump No 2 is stopped, the differential pressure transmitter for water system No 2 is transferred to the pump No 1 controller When pump No 1 can no longer maintain the set point at the No 2 differential pressure transmitter, pump No 2 is restarted Adaptive control can be applied here with the kW input continuously monitored for one and two pumps running The controller then selects one or two pumps to maintain the desired differential pressure on both chilled water systems with minimum of pump energy On some installations, the bypass check valve may not be necessary; if there is a multiplicity of pumps at the pump No 2 location, allowing reduced flow through a stopped pump may not cause an appreciable friction loss in the pumps
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