General and Dilution Ventilation - University of Washington

General and Dilution Ventilation

Dilution Ventilation

qThe solution to pollution is dilution? qDo you want to move a lot of air? qWhat happens in the winter? qHow do you get a sweeping effect? qWhy bother with local exhaust if there are too

many sources to vent them all? qTo have effective DV we need to:

qMix contaminated air with large volume of fresh air qHave sufficient air changes/hour to prevent build-up qCreate air movement and mixing at all required locations

General Ventilation - Purpose

qGeneral ventilation

qProvide heating or cooling qProvide make-up air qProvide dilution and reduction of contaminants

such as CO2 and body odor

qDilution ventilation

qProvide dilution of contaminants to safe levels ( LEV cost

Dilution Ventilation - applications

qToxicity of contaminant is low to moderate (High TLV)

qVelocity and generation rate of contaminant low to moderate ? must consider periodic generation too

qSources are not well localized or identifiable qMobile sources or variable work process qEnergy costs are not a significant concern

"Laminar" Flow Dilution System

Supply Plenum

Exhaust Plenum

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