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Figure 1112 Runaround bypass for VAV supply
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difference between the supply and return CFM is needed, to match the xed exhaust CFM in the building Because the two fans will always have different operating characteristics, it is not suf cient to simply track speed Either ows or pressures must be measured Various methods have been proposed for doing this, some involving complex and expensive control systems The general rule is to avoid using return-air fans unless the return-air system has a high-pressure loss Then a ow-sensing system such as shown that in Fig 1113 can be used In this system, the return-air fan volume controller is reset by the supply air ow Single-point ow sensing can be used, but greater
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Figure 1113 VAV return-air fan volume control
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 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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Equipment: Part 3 Equipment: Part 3 381
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accuracy is obtained with ow-measuring stations which measure velocities at several points across the duct The building pressure with respect to the outdoors may be the best control signal, but it requires sensitivity to very small pressure changes, which in turn require a quality sensor or controller and a stable control system Also, the outdoor pressure sensor is subject to variation of wind pressure and velocity The indoor sensor is subject to stack effects
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1125 Induction unit system
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Induction unit systems are no longer common, but many were installed in the 1950s and 1960s A central primary air system (singlezone arrangement) supplies a constant volume of air at a constant temperature (about 55 to 60 F for cooling) and a pressure of usually 6 to 8 in H2O The primary air temperature may be reset based on outside conditions The system handles up to 100 percent outside air; the outside air volume must be suf cient to satisfy building exhaust requirements and to provide some slight pressurization At each zone an induction unit is provided This unit (Fig 1114) includes a large face area, a low-pressure-drop coil used for additional cooling or reheat, a lint lter, and a supply grille for air delivery to the zone Primary air is supplied to the unit through nozzles arranged to induce a secondary air ow through the lter and coil Dehumidi cation is accomplished at the primary air unit Secondary chilled water to the induction units is kept at a temperature high enough to avoid condensation, also avoiding the need for a drainage system Induction
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Figure 1114 Induction unit
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
Equipment: Part 3 382 Eleven
units may be oor-mounted, exposed, or ceiling-mounted, partially concealed The system may use less fan energy than a conventional system, but piping and control systems become complex The primary air supply is constant, and the air supply to a zone may not be shut off Noise must be carefully attenuated These systems found favor in dormitory and hospital patient wing applications They were used in some instances as a perimeter system for of ce buildings 113 Package Air-Handling Units
A package unit is factory-assembled, ready for installation either in total or in large segments This class includes units for rooftop mounting, self-contained units, heat pumps, and split systems units with an indoor section and an outdoor section All these systems may or may not include factory-installed automatic controls and internal wiring and piping Field installation may include connections for electrical, fuel, and water service; duct distribution systems; system controls; and room thermostats Package equipment is available in a wide range of capacities; some rooftop units will provide 100 tons (40,000 to 50,000 ft3 /min) or more of cooling The advantage of the package unit is the cost and time saving in eld labor There are some disadvantages Combinations of fan and heating /cooling elements may require some compromise for a speci c application one or more elements may be oversized Ef ciencies may be lower than optimum because most package equipment is made as small as possible for minimum clearances, etc For the same reasons, maintenance may be more dif cult Typically, package equipment seems to be installed in less accessible places Factory-set control strategies may or may not suit the designer s needs Interface with building automation may be a challenge The designer should make sure that all listed capacities are based on tests of the package as built, rather than the individual components The unit geometry can have an effect, usually detrimental, on performance (see Sec 52) ASHRAE and the Air Conditioning and Refrigeration Institute (ARI) publish a number of standards for testing and rating package equipment
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