Flow through suction branches
The distribution of air in comfort conditioning installations is more important on the discharge side of the fan than on its suction side. The positioning and arrangement of
extract grilles is not usually very critical, and for this reason supply branch-pieces receive more attention in the literature on the subject. However, in industrial exhaust systems the arrangement of the ducting and the configuration of the suction hoods and openings is of vital importance. For such applications it is thus necessary to know something of the losses incurred when air flows into a suction branch-piece. Loss coefficients for a large variety of suction branch configurations are available in American literature. See Idelchik (1986), ASHRAE (1993b) and ACGIH (1995).
Posted in Engineering Fifth Edition