Lecture Objectives. Ventilation Effectiveness Thermal Comfort Meshing . IAQ parameters. Age-of-air air-change effectiveness (E V ) Specific Contaminant Concentration contaminant removal effectiveness e. Single value IAQ indicators E v and ε. Contaminant removal effectiveness ( e )
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air-change effectiveness (EV)
contaminant removal effectiveness e
1) Is the concentration of pollutant in the room with stratified flow larger or smaller that the concentration with perfect mixing?
2) How to find the concentration at exhaust of the room?
Temperature and relative humidity
Can create draft
Draft is related to air temperature,
air velocity, and turbulence intensity.
Warm ceiling (----)
Cool wall (---)
Cool ceiling (--)
Warm wall (-)
Further Details: ANSI/ASHRAE standard 55, ISO standard 7730
Body-fitted coordinate hexa
Unstructured hexa (2-D)
boundary-fitted, structured grid