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8511 Where exhaust makeup requirements govern, the outside air
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quantity will be xed and controlled by a two-position damper which opens whenever the supply fan runs This may provide 100 percent outside air or a xed percentage of total air quantity With 100 percent outside air it is usually recommended that the fan start-up sequence provide for opening the outside air damper before the fan starts Low static pressure in the intake plenum may cause a collapse of that plenum
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8512 The traditional economy cycle control of outside air (Fig
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851) operates as follows: When the supply fan is off, the outside air and relief dampers are closed When the fan is started, these dampers open to minimum position, as determined by the setting of the minimum position switch through selector relay R2 The return air damper will be partially closed to match If the outside air temperature is below the set point of controller C1, this controller will adjust the damper positions to maintain the required minimum mixed air temperature as sensed by T2 As the outside air temperature increases, the dampers will modulate and nally reach full open for outside and relief and closed for return As the outside air temperature continues to increase, it will reach the set point of high-limit thermostat T1 (typically about 75 F) This will cause switch R1 to block the signal from C1, allowing the dampers to return to minimum outside air position The purpose of this control system is to use outside air for cooling when possible and to minimize outside air use when refrigeration is
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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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Design Procedures: Part 6 Design Procedures: Part 6 267
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Reset (optional) C1 Minimum position NO NC R 1 S C Switch
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High select R2 Relief air Outside air
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DM 1
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Return air
NO Mixed air Filter
Figure 851 Classical economy cycle outside-air control
required Note that there are three control loops involved: the main loop with T2 and C1, another loop with T1 and R1, and a third loop with the minimum position switch
8513 With variable air volume (VAV) systems the economy cycle
may no longer be satisfactory, since it provides only a xed percentage of outside air which will result in a decrease in the quantity of outside air as the total air volume decreases To maintain a constant minimum volume of outside air, it is necessary to use other methods Many methods have been proposed A few of these are: The outside air fan uses a xed-volume fan to force outside air into the mixed air plenum of the air-handling system Some variations include economy cycle control as well Mixed air plenum pressure requires that the outside and return air dampers be controlled to provide a xed pressure in the mixed air
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
Design Procedures: Part 6 268 Eight
plenum This pressure is assumed to be enough lower than the outside air pressure to provide the required outside air quantity There is no provision for changes in outside pressure due to wind velocity and direction, nor for stack effect in the building, and these effects will change the outside air volume One hundred percent outside air with heat reclaim systems use a total heat reclaim system between outside air and exhaust air This system is effective and economical when using modern heat reclaim equipment in mild climates A more complex system is shown in Fig 852 This resembles the con guration of the traditional economy cycle but is controlled in an entirely different manner The primary sensor is the outside air ow velocity sensor F There is also a low-limit mixed air temperature sensor T2 and an outside air temperature sensor T1 Note that the outside air (OSA), return air (RA), and relief air (REL) dampers are controlled individually Control is provided by a direct digital controller (DDC), programmed as follows: The velocity corresponding to the minimum OSA ow rate is the set point At start-up the REL damper is closed,
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