Transcription of BUILDING AIR INTAKE AND EXHAUST DESIGN - ASHRAE
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BUILDING AIR INTAKE AND EXHAUST DESIGN - ASHRAE
46 BUILDING AIR INTAKE AND EXHAUST DESIGNE xhaust Stack and Air INTAKE DESIGN Method for Estimating Stack Dilution or Concentration air enters a BUILDING through its air INTAKE to provideO ventilation air to BUILDING occupants. Likewise, BUILDING ex-haust systems remove air from a BUILDING and expel the contaminantsto the atmosphere. If the INTAKE or EXHAUST system is not well de-signed, contaminants from nearby outdoor sources ( , vehicle ex-haust, emergency generators, EXHAUST stacks on nearby buildings) orfrom the BUILDING itself ( , laboratory fume hood EXHAUST , plumb-ing vents) can enter the BUILDING before dilution. Poorly diluted con-taminants may cause odors, health impacts, and reduced indoor airquality. This chapter discusses proper DESIGN of EXHAUST stacks andplacement of air intakes to avoid adverse air quality 24 of the 2017 ASHRAE Handbook Fundamentals de-scribes wind and airflow patterns around buildings in greater information can also be found in Chapters 9, 18, 33, 34, and35 of this volume, Chapters 11 and 12 of the 2017 ASHRAE Hand-book Fundamentals, and Chapters 29, 30, and 35 of the 2016 ASHRAE Handbook HVAC Systems and STACK AND AIR INTAKE DESIGN STRATEGIESS tack DESIGN StrategiesThe dilution a stack EXHAUST can provide is limited by the disper-sion capability of the atmosphere.
systems use variable-volume fans that reduce flow from hoods when they are closed. Stack exhaust velocity calculations must be based on the minimum total flow rate from the system, not the maximum. An exception to these exhaust velocity recomm endations include when corrosive condensate droplets are discharged. In this case, a
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