Duct and Pipe Design

CHAPTER LIST

ASPECT ratio.: Ratio of length to width of an opening or core of a grille.
Axial flow jet.: Stream of air with motion approximately symmetrical along a line, although some spreading and drop or rise can occur from diffusion and buoyancy effects.
Coefficient of discharge.: Ratio of area at vena contracta to area of opening.
Cold air.: General term for supply air at 35 to 40 F.
Core area.: Total plane area of that portion of a grille, included within lines tangent to the outer edges of the outer openings, through which air can pass.
Damper.: Device used to vary the volume of air passing through a confined cross section by varying the cross-sectional area.
Diffuser.: Outlet discharging supply air in various directions and planes.
Diffusion.: Distribution of air within a space by an outlet discharging supply air in various directions and planes.
Draft.: Undesired local cooling of a body caused by low temperature and air movement.
Drop.: Vertical distance that the lower edge of a horizontally projected airstream descends between the outlet and the end of its throw.
Effective area.: Net area of an outlet or inlet device through which air can pass; equal to the free area times the coefficient of discharge.
Entrainment.: Movement of room air into the jet caused by the airstream discharged from the outlet (secondary air motion).
Entrainment ratio.: Total room air divided by...

Copyright American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. 2005 under license agreement with Books24x7

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